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Transcript of LT technical manual - Comer above reasons, Shanghai Hanbell Precise Machinery Co., Ltd. specialized...
I
Content
1. GENERAL ......................................................................................................................................................................... 1
2. SPECIFICATIONS ........................................................................................................................................................... 2
2.1 NOMENCLATURE ............................................................................................................................................................... 2
2.2 PRODUCT LINE .................................................................................................................................................................. 2
2.3 SPECIFICATIONS ................................................................................................................................................................ 3
2.4 APPLICATION LIMITS ....................................................................................................................................................... 4
3. CONSTRUCTION & FUNCTIONS ................................................................................................................................. 6
3.1 DESIGN FEATURES ............................................................................................................................................................ 6
3.2 CAPACITY MODULATION .................................................................................................................................................. 7
3.2.1 Step-type Control ............................................................................................................................................................... 8
3.2.2 Stepless Type Control ...................................................................................................................................................... 13
3.2.3 The Positions of Solenoid Valves .................................................................................................................................... 18
3.3 COMPRESSOR STARTUP LOADING & STOP UNLOADING ................................................................................................. 19
4. LUBRICANT ................................................................................................................................................................... 20
4.1 LUBRICANT TABLE ......................................................................................................................................................... 20
4.2 OIL CHARGING ............................................................................................................................................................... 20
4.3 OIL CHANGE ............................................................................................................................................................................ 21
4.3.1 Oil Change Schedule: ................................................................................................................................................ 21
4.3.2 Pre-cautions of Changing Oil .................................................................................................................................... 21
5. SYSTEM APPLICATION............................................................................................................................................... 22
5.1 PIPING DESIGN ................................................................................................................................................................ 22
5.1.1 Suction and Discharge Piping Layout....................................................................................................................... 22
5.1.2 Economizer Piping Layout ........................................................................................................................................ 24
5.1.3 Minimum Pressure Valve .......................................................................................................................................... 25
5.1.4 Liquid Line Filter Dryer ............................................................................................................................................ 26
5.1.5 Sight Glass with Moisture Indicator .......................................................................................................................... 26
5.2 OIL LINE ......................................................................................................................................................................... 27
5.2.1 Oil Supply ................................................................................................................................................................... 27
5.2.2 Lubrication and Capacity Control Modulation ......................................................................................................... 27
5.2.3 Compressor chamber injection cooling system ......................................................................................................... 28
5.2.4 Protection in Oil Line ................................................................................................................................................ 30
5.2.5 Oil Cooling System ..................................................................................................................................................... 31
5.3 MOTOR LIQUID INJECTION COOLING ........................................................................................................................... 33
5.4 ECONOMIZER SYSTEM ................................................................................................................................................................... 35
5.4.1 Sub Cooler ........................................................................................................................................................................ 35
5.4.2 Flash Tank ........................................................................................................................................................................ 36
5.5 RECOMMENDED SYSTEM LAYOUT ............................................................................................................................................ 37
II
6. MOTOR DESIGN ........................................................................................................................................................... 38
6.1 MOTOR PARAMETERS AND DESIGN ............................................................................................................................... 38
6.1.1 Y-Δ Start ..................................................................................................................................................................... 38
6.1.2 Power source requirement ......................................................................................................................................... 39
6.1.3 MCC&LRA ................................................................................................................................................................. 40
6.1.4 Terminal cover plate. ................................................................................................................................................. 42
6.1.5 Terminal box .............................................................................................................................................................. 43
7. COMPRESSOR INSTALLATION ................................................................................................................................. 44
7.1 OPEN COMPRESSOR WOODEN CRATE ............................................................................................................................. 44
7.2 COMPRESSOR LIFTING ................................................................................................................................................... 44
7.3 COMPRESSOR INSTALLATION ......................................................................................................................................... 45
8. OPERATION AND MAINTENANCE ........................................................................................................................... 47
8.1 COMPRESSOR COMMISSIONING CHECK ......................................................................................................................... 47
8.1.1 Check list before Start up ........................................................................................................................................... 47
8.1.2 Check list during operation ....................................................................................................................................... 48
8.2 TROUBLE SHOUTING TABLE ........................................................................................................................................... 49
9. DIMENSIONS ................................................................................................................................................................. 51
10. ACCESSORIES ............................................................................................................................................................... 58
10.1 ACCESSORY LIST ............................................................................................................................................................. 58
10.2 ACCESSORY FOR GAS REFRIGERANT LINE ..................................................................................................................... 59
10.2.1 Shut-off valve ........................................................................................................................................................ 59
10.2.2 Flange bushing ...................................................................................................................................................... 60
10.2.3 Check valve ............................................................................................................................................................ 63
10.2.4 Minimum pressure valve ....................................................................................................................................... 65
10.3 OIL LINE ACCESSORY ...................................................................................................................................................... 67
10.3.1 Oil flow switch ............................................................................................................................................................... 67
10.3.2 External oil filter ................................................................................................................................................... 68
10.3.3 Oil line solenoid valve ........................................................................................................................................... 70
10.3.4 Oil pressure differential switch ............................................................................................................................. 70
10.4 ELECTRICAL ACCESSORY ............................................................................................................................................... 71
10.4.1 INT-69HBY motor protector ................................................................................................................................. 71
10.4.2 Oil heater 300W ..................................................................................................................................................... 72
10.5 OTHER ACCESSORY......................................................................................................................................................... 74
10.5.1 Mounting pad ........................................................................................................................................................ 74
1
1. General
For conventional single-stage screw compressors, the minimum evaporating temperature
is -40℃to -50℃ when they are used in refrigeration field, and the minimum ambient
temperature is -15℃ when applied to heat pumps. If you want to break this application
limitation, a compound two-stage compressor or multi unit of single stage compressors are
necessary. Meanwhile, the condition of high pressure ratio brings problems to the traditional
single stage compressors during compression process, such as excessive gas leakage and
exhaust temperature overheat etc., which leads to low efficiency and poor reliability when it
is working is such harsh condition.
While the single two-stage compressor well solves above problems. Compared to the
compound two-stage compressors and multi unit of single stage compressors, the single
two-stage compressors occupy less space and the system is easy to control, so it's more
efficiency and reliable.
The LT-S single two-stage low temperature type compressor can achieve
-60~-65℃evaporating temperature; the water outlet temperature of the LT-S-H single
two-stage high temperature type compressor can reach 90℃ when it is applied on water
source and ground source heat pump, which meet the heat demand of the radiator and other
industries and -40℃ when it is applied on air source heat pump, which greatly enlarge the
application field of the traditional air source heat pump. Because its energy efficiency ratio in
the low ambient temperature is higher, it's a perfect solution for haze governance and boiler
replacement.
For above reasons, Shanghai Hanbell Precise Machinery Co., Ltd. specialized in the
development of LT series two-stage screw refrigeration compressors which is composed of
two types: the semi-hermetic type (-S) and open type (-G). They can be used in the field of
low temperature refrigeration and high temperature heat pump according to the application.
High efficiency and reliability under big pressure difference and compression ratio working
condition is the main demand in design. It is a product of elite which accumulates Shanghai
Hanbell's rich technology and extensive application experience. LT can be widely used in low
temperature frozen products, frozen tunnels, freezers, process cooling, pharmaceutical
biochemistry, high temperature hot water, central heating and many other industries.
2. Specifications
2.1 Nomenclature
Figure 2-
2.2 Product Line
Figure
﹡NOTE: LT-XXXX includes LT-S/LT-
Disp
lace
men
t
m
3
/
h
-1. Nomenclature of LT Series Compressors
LT Series Compressor Displacement
Figure 2-2. LT Series Compressor Displacement
-S-H
2
3
2.3 Specifications
Model
Compressor
Low Stage High Stage Rotation
Speed
50Hz
r/min
Capacity Control
(Step type: ST)
(Stepless type: SL)
Lubrication
Type
Nozel Level
Displacement LT-S LT-S-H
50HZ 50HZ
m3/h m3/h ST SL
LT-20/10 224 99
2950
10%/50%
100% 10%~100%
Pressure
differential
80 81
LT-30/12 316 134 81 82
LT-45/20 450 207 83 84
LT-55/25 551 257 84 85
LT-65/32 651 313 10%/50%
75%/100%
86 88
LT-83/41 840 396 87 89
Model
Quality Motor
Pressure Test
Type Starting
Voltage
(V)
50HZ
Insulation Protection LT-S LT-S-H LT-S LT-S-H
Kg Bar
LT-20/10 598 620
3
phase
2 pole
Star
Delta 380 Level F
PTC+
PT100 35 15
LT-30/12 620 650
LT-45/20 1158 1200
LT-55/25 1195 1230
LT-65/32 1395 1450
LT-83/41 1430 1490
Figure 2-3.LT Series Compressor Specification
2.4 Application Limits
Co
nd
ensin
g T
emp
erature
Co
nd
ensin
g T
emp
erature
Figure 2-1. R22 Application Range
Figure 2-2. R404A Application Range
4
Co
nd
ensin
g T
emp
erature
Figure 2-3. R134a Application Range
5
6
3. Construction & Functions
3.1 Design Features
1) Unloading-type slide valve in high stage
Patented design, high voltage, automatic unloading VI blocking structure. The pure
mechanical structure design can simply & effectively realize the light loading of the
compressor without additional configuration of solenoid valves and other external
parts.
2) Check valve, shutoff valve and built-in economizer filter
Pre-install check valve, shutoff valve and economizer filter to realize the reliable
protection of the compressor and simplify customer's configuration system.
3) Optimized motor cooling path
Excellent design of the motor cooling path which cools down the motor coil reliably,
that enables the compressors to be used in wider range and enhanced the adaptability
of the compressor.
4) Pressure designed can meet high temperature application
The designed pressure is 36bar which meets the requirements of high temperature
application.
7
3.2 Capacity Modulation
The capacity modulation of LT series screw compressors has step type (3-step / 4-step)
and stepless type. Both of these two different capacity modulations work with the slide valve,
piston rod, cylinder, and piston. See below Figure 3-1.
When the slide valve is at the suction side completely, the screw rotors work with full
displacement under full load, at that time the compressor work volume is the maximum.
When the slide valve moves to the discharge side, the bypass occurs between the slide valve
and the suction side. The existing of the bypass results in the compressed gas of this range
bypassing to the low pressure directly, and the actual suction volume of the screw rotor
decreases. The more the sliding valve moves to the discharge side, the smaller the actual
suction capacity of the compressor will be, thereby reducing the system cooling capacity.
The slide valve is driven by the pressure difference among the internal capacity
modulation.
The lubricant comes from the external oil separator and passes through the oil filter then
enters into the oil inlet port of the compressor, and at last divided into both sides of the piston.
As a result, the piston can be controlled by discharge one side of the high pressure lubricant
to low pressure, letting it flow to the low pressure side so that the slide valve will move with
the piston to realize the loading and unloading of the compressor.
The purpose of the piston spring is to push the piston to its initial position (min. load
position), so as to realize the automatic unloading start. It not only reduces the mechanical
impact on the compressor's moving parts, but also reduces the electrical current during
compressor start up.
Stepless capacity control, solenoid valve(SV1:unloading, SV3:50%, SV5:100% ) is
controlled by a micro controller or a thermal switch to adjust the piston smoothly with stable
control of the cold output. If the oil filter in the capacity adjusting system, capillary or
solenoid valve don't work properly, it will cause the capacity adjusting system to be abnormal
and fail.
Figure 3-1 Capacity Modulation
8
3.2.1 Step-type Control
1) Step-type table
Y: Energize the solenoid valve N: Do not energize the solenoid valve
LT-83/41 &
65/32
Capacity
regulating
system
SV1:
(NC)
SV2:10%
(NC)
SV3:50%
(NC)
SV4:75%
(NC)
SV5:100%
(NC)
100% N N N N Y
75% Y N N Y N
50% Y N Y N N
10%
(Startup/Stop) Y Y N N N
LT-20/10
LT-30/12
LT-45/20
LT-55/25
Capacity
regulating
system
SV1:
(NC)
SV2:10%
(NC)
SV3:50%
(NC) /
SV5:100%
(NC)
100% N N N / Y
50% Y N Y / N
10%
(Startup/Stop) Y Y N / N
Table 3-1. Step-type Capacity Regulating Control Logic
2) Step-type capacity modulation diagram
Figure
3) Description of Step
� 10% load
capacity modulation diagram
Figure 3-2. Step-type capacity modulation
Description of Step-type control
Figure 3-3.10% Load
9
When starting up the compressor, SV1(unloading) & SV2 (10%) need
make the piston keep at the 10% position(Left side)
Under this situation, the high pressure oil passes through SV1 then goes to the right side
of the piston. At the same time, the oil in left side of the piston passes through SV2 (10%)
then going out to the low pressure side.
position.
★ Note: 10% load is for start up only. Running the compressor
recommended.
� 50% load
Under 50% load, SV1&SV3 (50%)
oil passes to the left side of the piston continuously. At the same time, the oil passes through
SV1 goes to the right side of the piston.
If the piston position is at the left side of the 50% hole (the loading is lower than 50%),
the oil in the right side of the piston will pass through SV3 (50%) and go out to the low
pressure side then the piston will move to right side until the position
It’s called loading to the 50% position.
Vice versa, if the piston position is at the right side of the 50% hole (the loading is higher
than 50%), the oil in the left side of the piston will pass through SV3 (50%) and go out to the
When starting up the compressor, SV1(unloading) & SV2 (10%) need
make the piston keep at the 10% position(Left side)
Under this situation, the high pressure oil passes through SV1 then goes to the right side
of the piston. At the same time, the oil in left side of the piston passes through SV2 (10%)
hen going out to the low pressure side. By doing so, the piston can be held at the 10%
p only. Running the compressor at 10% load for a long time is not
Figure 3-4.50% Load
1&SV3 (50%) are energized. Under this situation, the high pressure
oil passes to the left side of the piston continuously. At the same time, the oil passes through
goes to the right side of the piston.
If the piston position is at the left side of the 50% hole (the loading is lower than 50%),
the oil in the right side of the piston will pass through SV3 (50%) and go out to the low
pressure side then the piston will move to right side until the position b
It’s called loading to the 50% position.
Vice versa, if the piston position is at the right side of the 50% hole (the loading is higher
than 50%), the oil in the left side of the piston will pass through SV3 (50%) and go out to the
10
When starting up the compressor, SV1(unloading) & SV2 (10%) need to be energized to
Under this situation, the high pressure oil passes through SV1 then goes to the right side
of the piston. At the same time, the oil in left side of the piston passes through SV2 (10%)
doing so, the piston can be held at the 10%
at 10% load for a long time is not
energized. Under this situation, the high pressure
oil passes to the left side of the piston continuously. At the same time, the oil passes through
If the piston position is at the left side of the 50% hole (the loading is lower than 50%),
the oil in the right side of the piston will pass through SV3 (50%) and go out to the low
blocks the 50% hole.
Vice versa, if the piston position is at the right side of the 50% hole (the loading is higher
than 50%), the oil in the left side of the piston will pass through SV3 (50%) and go out to the
low pressure side then the piston will move to left until the position
called unloading to the 50% position.
� 75% load
Under 75% load, SV1&SV4 (75%)
The logic of 75% load is similar to th
75% hole to make the compressor run under 75% position.
pressure side then the piston will move to left until the position blocks the
called unloading to the 50% position.
Figure 3-5.75% Load
Under 75% load, SV1&SV4 (75%) are energized.
The logic of 75% load is similar to that of 50%. The piston can be held at the 75% position by
75% hole to make the compressor run under 75% position.
11
blocks the 50% hole. It’s
of 50%. The piston can be held at the 75% position by
� 100% load
Under 100% load, SV5 (100%)
passes to the left side of the piston continuously. At the same time, the oil in the right side of
the piston passes through SV5 (100%) then goes to the low pressure side to make the piston
be held at 100% position.
1) The control of the water temperature with step
★ Note: T & T' should be adjusted by system designer’s experience and practical application.
50%
Start
Set point + 2T
Set point + T
Set point
Set point– T'
100%
t1 t2
75% 10%
1~3
min
Condensing water temp.
Figure 3-6.100% Load
Under 100% load, SV5 (100%) are energized. Under this situation, the high pressure oil
to the left side of the piston continuously. At the same time, the oil in the right side of
the piston passes through SV5 (100%) then goes to the low pressure side to make the piston
The control of the water temperature with step type
Figure3-7. Water Temperature Control with Step Type
should be adjusted by system designer’s experience and practical application.
Stop
50% 75%
60~90 sec
12
energized. Under this situation, the high pressure oil
to the left side of the piston continuously. At the same time, the oil in the right side of
the piston passes through SV5 (100%) then goes to the low pressure side to make the piston
Water Temperature Control with Step Type
should be adjusted by system designer’s experience and practical application.
Time
Stop
10%
60~90 sec
3.2.2 Stepless Type Control
Stepless type is suitable when the refrigeration system needs to achieve precise control of
cooling capacity.
1) Stepless-type table
N: Do not energize the solenoid valve
LT Series
Capacity
regulating system
SV1:
(NC)
Loading N
Unloading Pulse active
Holding N
10% load
(Start/Stop) Stay active
Table 3-2. Stepless Type Capacity Regulating Control 50%~100%
2) Stepless-type capacity modulation diagram
Figure 3
is suitable when the refrigeration system needs to achieve precise control of
type table
Do not energize the solenoid valve
SV2:10%
(NC)
SV3:50%
(NC)
N N
Pulse active N Stay active
N N
Stay active Stay active N
2. Stepless Type Capacity Regulating Control 50%~100%
type capacity modulation diagram
Figure 3-8. Stepless-type capacity modulation
13
is suitable when the refrigeration system needs to achieve precise control of
SV5:100%
(NC)
Pulse active
N
N
N
2. Stepless Type Capacity Regulating Control 50%~100%
3) Description of Stepless
In stepless type control, the oil keeps going to the left side of the piston. The oil bypass
in the left side of the piston is controlled by SV
the piston is controlled by SV1 and oil bypass in the right side of the pisto
SV5 (100%). These three solenoid valves are controlled by temperature controller or PLC.
Through the three solenoid valve, the cooling capacity can be controlled at any position
from 50%~100%, so periodical adjustment of
stably.
★ Note: SV2(10%) can only be used for machine start and stop. Don't run the machine
at 10% loading for long time once the machine is started. It shall be switched to loading
model directly.
The stepless type capacity regula
controller(optional), eg. PLC etc. in order to control the system at the
� Loading
During loading process, the SV5 (100%)
valve are not activated. In this kind of situation, the
the piston continuously and the oil in the right side of the piston bypasses through SV5 (100%)
to the low pressure side. The piston
compressor will load.
Description of Stepless-type control
type control, the oil keeps going to the left side of the piston. The oil bypass
s controlled by SV3 (50%). The oil charging in the right side of
the piston is controlled by SV1 and oil bypass in the right side of the pisto
SV5 (100%). These three solenoid valves are controlled by temperature controller or PLC.
Through the three solenoid valve, the cooling capacity can be controlled at any position
from 50%~100%, so periodical adjustment of SV1、SV3、SV5 can control the energy output
SV2(10%) can only be used for machine start and stop. Don't run the machine
at 10% loading for long time once the machine is started. It shall be switched to loading
The stepless type capacity regulating system shall be connected to the micro
etc. in order to control the system at the 6
Figure 3-9. Loading
he SV5 (100%) adopts pulse activation, and the
valve are not activated. In this kind of situation, the high pressure oil goes into the left side of
the piston continuously and the oil in the right side of the piston bypasses through SV5 (100%)
to the low pressure side. The piston will continue to move to the right side and the
14
type control, the oil keeps going to the left side of the piston. The oil bypass
0%). The oil charging in the right side of
the piston is controlled by SV1 and oil bypass in the right side of the piston is controlled by
SV5 (100%). These three solenoid valves are controlled by temperature controller or PLC.
Through the three solenoid valve, the cooling capacity can be controlled at any position
control the energy output
SV2(10%) can only be used for machine start and stop. Don't run the machine
at 10% loading for long time once the machine is started. It shall be switched to loading
ting system shall be connected to the micro
6
and the rest solenoid
high pressure oil goes into the left side of
the piston continuously and the oil in the right side of the piston bypasses through SV5 (100%)
to the right side and the
� Unloading
During unloading process, t
and the rest solenoid valve are not activated. T
continues to inject into the left side of the piston &
right side of the piston. Through SV3(50%), it bypasses to the low pressure side, so that the
piston continues to move to the lift side, an
Figure 3-10. Unloading
During unloading process, the SV2(50%) stays active, and SV1 adopts pulse activation
rest solenoid valve are not activated. The high pressure oil coming from the oil tank
into the left side of the piston & passes through SV1 and goes into the
Through SV3(50%), it bypasses to the low pressure side, so that the
piston continues to move to the lift side, and the compressor will load to 50% piston.
15
and SV1 adopts pulse activation ,
coming from the oil tank
passes through SV1 and goes into the
Through SV3(50%), it bypasses to the low pressure side, so that the
d the compressor will load to 50% piston.
� Holding
During this process, all S/V are not energized.
tank continues to inject into the left side of the piston. The left side oil inlet of the piston
SV1and SV5(100%) are closed to keep the oil amount in the piston right side. The piston will
not be able to move and stay at its original position, so that the compressor capacity wil
change as well.
� The control of the water temperature with stepless type
Below picture shows load control model of single compressor using stepless type capacity
regulation.
Chilled water temp.
Figure 3-11. Holding
, all S/V are not energized. The high pressure oil coming from the oil
into the left side of the piston. The left side oil inlet of the piston
to keep the oil amount in the piston right side. The piston will
not be able to move and stay at its original position, so that the compressor capacity wil
The control of the water temperature with stepless type
load control model of single compressor using stepless type capacity
Figure 3-12 Stepless Capacity Regulation
16
The high pressure oil coming from the oil
into the left side of the piston. The left side oil inlet of the piston
to keep the oil amount in the piston right side. The piston will
not be able to move and stay at its original position, so that the compressor capacity will not
load control model of single compressor using stepless type capacity
12 Stepless Capacity Regulation Time
★ Note:X′ : Upper Limit;X〞:Lower Limit
� Description
� The real value is larger than the top line between A & B. It means the required cooling
capacity is increasing and the compressor needs to be loaded until the
the control range.
� The real value is smaller than the bottom line between C & D. It means the required
cooling capacity is decreasing and the compressor needs to be unloaded until the real
value returns to the control range.
Figure 3-13 Solenoid Valve Action Intervals
★ Note:For detail stepless type capacity regulation control logic, please refer to Table 3
Load/Unload functions between A and B & C and D.
� Open means S/V is energized
� Close means S.V is not energized
� T1,T3:Pulse time 0.5~1.5seconds
� T2,T4:Pause time 10~20seconds
:Lower Limit;X:Set Point;H: Control Range;
The real value is larger than the top line between A & B. It means the required cooling
capacity is increasing and the compressor needs to be loaded until the
The real value is smaller than the bottom line between C & D. It means the required
cooling capacity is decreasing and the compressor needs to be unloaded until the real
value returns to the control range.
13 Solenoid Valve Action Intervals-Stepless type
For detail stepless type capacity regulation control logic, please refer to Table 3
Load/Unload functions between A and B & C and D.
Open means S/V is energized
Close means S.V is not energized
Pulse time 0.5~1.5seconds
Pause time 10~20seconds
17
;Y:Actual value
The real value is larger than the top line between A & B. It means the required cooling
capacity is increasing and the compressor needs to be loaded until the real value returns to
The real value is smaller than the bottom line between C & D. It means the required
cooling capacity is decreasing and the compressor needs to be unloaded until the real
Stepless type
For detail stepless type capacity regulation control logic, please refer to Table 3-2
3.2.3 The Positions of Solenoid Valves
1. LT-65/32, LT-83/41
Figure
2. LT-20/10, LT-30/12, LT
Figure 3-15 LT
3.2.3 The Positions of Solenoid Valves
Figure 3-14 LT-83/41<-65/32 S/V position
LT-45/20, LT-55/25
LT-20/10<-30/12<-45/20<-55/25 S/V position
18
S/V position
3.3 Compressor startup loading
To decrease the mechanical loading to compressor’s parts and
during start up. Hanbell designs for LT compressor the function of unloading startup. To
ensure compressor loads steadily, please follow Figure 3
whole loading process.
When compressor is about to shut down, it is also required to unload. Theref
the slide valve is at lowest loading position during next startup and compressor could have an
unloading startup. Thus Hanbell requires n
is, it should be unloaded step by step to minimum loading
Figure 3
Caution:
1) After startup, keep the minimum load for
minimum load for 30 seconds
2) After startup, when the pressure difference between high pressure and middle pressure
is less than 3.5bar, the compressor shall be run at 10% load at low pressure stage. Don't
load and open ECO.
3) t>30 seconds(Time can be set to 30~60seconds)
4) After the compressor shut down, the SV1 & SV2(10%) need to be still energized
minutes, so as to ensure the compressor can still at min loading position at next startup
5) Hanbell strongly recommends that the compressor start
shall refer to above diagram.
written in LT-S Control Requirements.
loading & stop unloading
the mechanical loading to compressor’s parts and reduce
designs for LT compressor the function of unloading startup. To
ensure compressor loads steadily, please follow Figure 3-16 to load step by step during the
When compressor is about to shut down, it is also required to unload. Theref
the slide valve is at lowest loading position during next startup and compressor could have an
Thus Hanbell requires no matter what loading condition o f the compressor
step by step to minimum loading before stop.
Figure 3-16. Compressor Sartup & Stop Process
After startup, keep the minimum load for 10 seconds. Before shut down, keep the
econds(Time can be set to 10~60seconds)
when the pressure difference between high pressure and middle pressure
3.5bar, the compressor shall be run at 10% load at low pressure stage. Don't
(Time can be set to 30~60seconds).
After the compressor shut down, the SV1 & SV2(10%) need to be still energized
the compressor can still at min loading position at next startup
Hanbell strongly recommends that the compressor start-up and shutdown control log
shall refer to above diagram. For detail information, please refer to the regulations
S Control Requirements.
19
reduce the starting current
designs for LT compressor the function of unloading startup. To
to load step by step during the
When compressor is about to shut down, it is also required to unload. Therefore ensure
the slide valve is at lowest loading position during next startup and compressor could have an
what loading condition o f the compressor
. Before shut down, keep the
(Time can be set to 10~60seconds).
when the pressure difference between high pressure and middle pressure
3.5bar, the compressor shall be run at 10% load at low pressure stage. Don't
After the compressor shut down, the SV1 & SV2(10%) need to be still energized for 3
the compressor can still at min loading position at next startup.
up and shutdown control logic
For detail information, please refer to the regulations
4. Lubricant
4.1 Lubricant Table
Note:
1) Please refer to the table above to select the suitable
operation range need to be taken into consideration as well.
2) Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
since it may damage the compressor seriously.
3) This table is for LT series compressors only
4) The oil temperature at the point when the compressor starts is suggested to be 5K higher
than the corresponding saturation temperature of the oil separator in order to avoid too
much oil containing in the refrigerant which may affect th
5) After compressor stops, please turn on the oil heater. If the compressor shuts down for a
long time, the oil heater doesn’t need to be turned on. Please turn on the oil heater for
more than 2 hours before next start up.
4.2 Oil Charging
1) Make sure the system is clean and free of
2) In order to ensure no moisture in the system, Hanbell suggests cleaning the system by
charging dry Nitrogen and vacuuming for several times. Try to make vacuuming time as
longer as possible to eliminate moisture in the system.
Note:
a. Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
since it may damage the compressor seriously.
b. Hanbell strongly recommends do not mix up different lubr
compressor seriously. Please pay attention to this issue in all future maintenance.
Table 4-1 Lubricant Specification
Please refer to the table above to select the suitable lubricant and the refrigerant and its
operation range need to be taken into consideration as well.
Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
since it may damage the compressor seriously.
es compressors only
The oil temperature at the point when the compressor starts is suggested to be 5K higher
than the corresponding saturation temperature of the oil separator in order to avoid too
much oil containing in the refrigerant which may affect the lubricant.
After compressor stops, please turn on the oil heater. If the compressor shuts down for a
long time, the oil heater doesn’t need to be turned on. Please turn on the oil heater for
more than 2 hours before next start up.
Make sure the system is clean and free of welding debris before charging
2) In order to ensure no moisture in the system, Hanbell suggests cleaning the system by
charging dry Nitrogen and vacuuming for several times. Try to make vacuuming time as
longer as possible to eliminate moisture in the system.
a. Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
since it may damage the compressor seriously.
b. Hanbell strongly recommends do not mix up different lubricant since it may damage the
compressor seriously. Please pay attention to this issue in all future maintenance.
20
lubricant and the refrigerant and its
Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
The oil temperature at the point when the compressor starts is suggested to be 5K higher
than the corresponding saturation temperature of the oil separator in order to avoid too
e lubricant.
After compressor stops, please turn on the oil heater. If the compressor shuts down for a
long time, the oil heater doesn’t need to be turned on. Please turn on the oil heater for
welding debris before charging the oil.
2) In order to ensure no moisture in the system, Hanbell suggests cleaning the system by
charging dry Nitrogen and vacuuming for several times. Try to make vacuuming time as
a. Hanbell strongly recommends do not use the lubricant which isn’t certified by Hanbell
icant since it may damage the
compressor seriously. Please pay attention to this issue in all future maintenance.
21
4.3 Oil Change
4.3.1 Oil Change Schedule:
1)Check lubricant every 10,000 hours of continuous running. For the first operation of
the compressor, it is recommended to change the oil and clean the external oil filter
after running 2,000 hours. Check the system whether clean or not and then change oil
every 20,000 hours or after 4 years continuous running while the system operates in
good condition.
2)The oil will deteriorate if the compressor runs at high discharging temperature (Above
95℃) in the long term. Please avoid this situation, but if it’s necessary to run in this
condition, please shorten the intervals of oil changing.
4.3.2 Pre-cautions of Changing Oil
1) It is recommended to double check the quality of oil periodically in order to
maintain the lubrication performance.
2) The lubricant absorbs moisture in the air. Avoid the situation that oil expose to
air for a long time
3) It is a must to change the oil in motor burned out case, because acid material and
debris may still remain inside the system. Please follow the procedures mentioned
above to change the oil in the system. Check acidity of oil after 72 hours of
operation and then change it again until acidity of oil returns to normal value.
4) The foreign body of the oil will block up the oil line, so it is necessary to install
the oil filter in oil line. It is necessary to install the pressure sensor before and after
the oil filter. If the pressure difference between these two sensors reaches 1.5 bar,
the oil filter need to be changed.
5) The acidity of oil will affect directly the life of the motor, and it is recommended
to change the oil when PH≤6. (Please also change the filter drier at the same time
to make sure the system is in dry condition.)
6) It is important to change the oil, especially when the motor burnt because the
acidity remains in the system. By changing the oil can help check the status of the
system. Check the acidity of the lubricant, re-change the after the system runs for
72 hours until the acidity of the lubricant reaches the standard valve.
7) In case of motor burned out, please not only change the compressor, but also
change the oil and check the condition of the oil periodically. If the acidity
excesses the standard, please change it immediately and always be aware of the
cleanliness and moisture content in the system.
22
5. System Application
★ Note:Please consult Hanbell for parallel application and heat pump application.
5.1 Piping Design
5.1.1 Suction and Discharge Piping Layout
1) Material and structure of suction and discharge pipe
The vibration is low when the compressor is in operation so it is not
necessary to use flexible joint materials for suction and discharge tubes. However,
piping in other places must be flexible enough without causing any inner stress
for the compressor. It is recommended to use copper tube for the suction and
discharge piping in order to lower the piping vibration when the compressor is in
operation.
2) The dimensions of suction and discharge piping:
It is recommended to design the dimension of suction and discharge piping
according to Hanbell’s suggestion.(refer to 10.2.2)
3) Piping for the parallel system
To improve the system operation efficiency, it’s necessary to reduce the
gas-flow resistance and consider the oil return of suction piping.
The recommended piping of suction and discharge side for parallel system is shown
below:
Be aware of the dimension of the main pipe should not be less than the dimensions of the
other pipes to make sure the pressure drops could be controlled in reasonable ranges.
23
� Recommended discharge piping
Figure 5-1: Discharging piping for parallel system
Detail drawing 1
� Recommended suction piping
Figure 5-2: Suction piping for parallel system
x x x
x x x
Refrigerant drained to the
condenser
Detail drawing 2
Refrigerant from
evaporator
4) Suction Filter
There is a built in suction filter in compressor, but it only functions as a final
protection, so it cannot be used as a normal suction filter which requires
periodically clean.
Please install anot
periodically clean.
It might require frequent cleaning of
commissioning. If the pressure drop is higher than
change the filter or clean it until the system is clean.
if the filter is damaged,
the piping. When installation, please confirm the direction of suction
correct, and it is highly recommended to install service valves before and after
the filter chamber for easy maintenance. Hanbell recommended suction filter
layout as shown below
★ Note:The external suction filter is for low temperature refrigeration system; it's not necessary for high
temperature heat pump.
5.1.2 Economizer Piping Layout
1) Dimension of Economizer
A stop valve of the economizer is the standard accessory. It’s recommended
to design the dimens
(Refer to 10.2.2)
2) Check valve for the economizer
Parts of oil and refrigerant will flow back when the working condition is not
There is a built in suction filter in compressor, but it only functions as a final
, so it cannot be used as a normal suction filter which requires
Please install another suction filter(25μm)at the suction area
require frequent cleaning of the suction filter
commissioning. If the pressure drop is higher than 0.5bar
change the filter or clean it until the system is clean. When dismantling the filter,
damaged, please change it immediately and clean the
the piping. When installation, please confirm the direction of suction
correct, and it is highly recommended to install service valves before and after
the filter chamber for easy maintenance. Hanbell recommended suction filter
layout as shown below Figure 5-3.
Figure 5-3 Suction filter
suction filter is for low temperature refrigeration system; it's not necessary for high
Economizer Piping Layout
Dimension of Economizer
A stop valve of the economizer is the standard accessory. It’s recommended
to design the dimension of the piping according to Hanbell’s suggested value.
Check valve for the economizer
Parts of oil and refrigerant will flow back when the working condition is not
24
There is a built in suction filter in compressor, but it only functions as a final
, so it cannot be used as a normal suction filter which requires
at the suction area & do
the suction filter in the initial
0.5bar,it’s necessary to
When dismantling the filter,
please change it immediately and clean the debris left in
the piping. When installation, please confirm the direction of suction filter is
correct, and it is highly recommended to install service valves before and after
the filter chamber for easy maintenance. Hanbell recommended suction filter
suction filter is for low temperature refrigeration system; it's not necessary for high
A stop valve of the economizer is the standard accessory. It’s recommended
ion of the piping according to Hanbell’s suggested value.
Parts of oil and refrigerant will flow back when the working condition is not
25
stable or when economizer route is closed. In order to avoid this situation, the
check valve should be installed in the economizer piping.
3) Filter for economizer
There is a built in economizer filter for protecting the compressor from
debris penetration in initial commissioning. It is not suitable to change the core of
this filter and do periodically cleaning. If the system do need this function, please
add another external filter on the economizer piping.
5.1.3 Minimum Pressure Valve
The oil pressure difference between oil inlet on middle pressure chamber and
discharge pressure must reach 2.5 bar in 30 seconds after start up.
If the oil pressure difference is too low, the oil supply is not sufficient and may
cause damage to compressor.
So, we provide a minimum pressure valve for LT series compressor, as to
achieve the pressure difference between high pressure and middle pressure quickly.
The minimum pressure valve should be mounted after the external oil filter, and
connected to the compressor medium pressure test point.
The place of the minimum pressure valve and its assembly method are shown as
below picture.
Figure 5-4. Pressure Maintenance Valve Assembly Diagram
26
Model Single
Parallel configuration
Two in parallel Three in
parallel
Four in
parallel
LT-20/10 2” 3” 4” 5”
LT-30/12 2” 3” 4” 5”
LT-45/20 2.5” 4” 5” 6”
LT-55/25 2.5” 4” 5” 6”
LT-65/32 2.5” 4” 5” 6”
LT-83/41 2.5” 4” 5” 6”
Table 5-1. Pressure Maintenance Valve configuration Single & in Parallel
★Note:For LT series compressors, the standard minimum pressure valve size we provide to you is
the same as that of the discharge valve.
★Note:Besides the standard size, other sizes are optional (refer to 10.2.4)
★Note:LT series compressor must be equipped with minimum pressure valve.
5.1.4 Liquid Line Filter Dryer
It will cause damage to the compressor and system even a low moisture content
left in the system, so it’s a must to install a filter drier on liquid line to keep the
system dry.
5.1.5 Sight Glass with Moisture Indicator
It is strongly recommended to install the sight glass with moisture indicator in
order to observe the moisture content in the system. When the moisture content is
high, it is necessary to change the filter dryer.
★Note:Hanbell can provide the sight glass with moisture indicator ad an option.
27
5.2 Oil Line
5.2.1 Oil Supply
The oil is supplied by the pressure difference which equals to the pressure
difference between oil separator and oil injection point. The oil is injected into the
bearings and compression casing, and then carried out of the compressor with
discharging gas. The oil will enter the oil separator again and complete the oil
circulation.
5.2.2 Lubrication and Capacity Control Modulation
The oil will be injected from two oil injection connectors which supply the oil
to suction and discharge bearings respectively as shown below. Besides, the
connector for the lubrication of suction side bearings is also used for oil supply to
capacity control system.
Figure 5-5 Oil supply connector of discharge bearing & suction bearing
low pressure bearing oil
supply connector
high pressure bearing oil supply connector
5.2.3 Compressor chamber injection cooling system
In certain working condition, the compressor might need liquid inject
chamber to lower the discharge temperature and make sure the
operated properly. There
Figure 5-6 below)
Figure
1) High stage chamber cooling
After low pressure compression, the
Although the economizer provides medium pressure air to mix with the low stage
discharged gas, which realizes
is also responsible for the cooling of the motor,
temperature. Thus, when the re
high stage, the liquid injection cooling function become a must. That's why Hanbell
requires that the high stage chamber liquid injection cooling must be applied.
★ Remark: Hanbell recommends to use oil for liquid injection to chamber.
Compressor chamber injection cooling system
In certain working condition, the compressor might need liquid inject
chamber to lower the discharge temperature and make sure the
operated properly. There is one port for liquid injection to chamber. (As shown in the
Figure 5-6 Connector for Liquid injection to chamber
age chamber cooling
After low pressure compression, the temperature of the gas has been higher.
Although the economizer provides medium pressure air to mix with the low stage
discharged gas, which realizes a certain intermediate cooling. However, the refrigerant
is also responsible for the cooling of the motor, so it remains with over high
temperature. Thus, when the refrigerant with over high temperature is compressed in
high stage, the liquid injection cooling function become a must. That's why Hanbell
requires that the high stage chamber liquid injection cooling must be applied.
Hanbell recommends to use oil for liquid injection to chamber.
28
In certain working condition, the compressor might need liquid injected to the
chamber to lower the discharge temperature and make sure the compressor will be
for liquid injection to chamber. (As shown in the
temperature of the gas has been higher.
Although the economizer provides medium pressure air to mix with the low stage
a certain intermediate cooling. However, the refrigerant
so it remains with over high
frigerant with over high temperature is compressed in
high stage, the liquid injection cooling function become a must. That's why Hanbell
requires that the high stage chamber liquid injection cooling must be applied.
29
Suggestions for oil line layout
Figure 5-7 Basic oil line
30
5.2.4 Protection in Oil Line
The normal operation of line system is critical to the reliability of compressor.
To ensure the normal operation of the capacity modulation, reliability of the bearing
and cooling effect, please pay attention to the below points:
1) Oil temperature
The oil inlet temperature of lubricant needs to be strictly maintained.
When temperature of oil is too low:
� It may lead to the viscosity of the lubricant over high and insufficient oil supply and
abnormal capacity control.
� It may cause excessive liquid refrigerant dissolving in the lubricant, which leads to
severe oil being carried over, resulting in oil lacking in the system. The lubrication
effect will be influenced as well, and it will lead to the bearing to be damaged.
When temperature of oil is too high:
� The viscosity will reduce, so the lubricant effect will be poor, which leads to
premature of bearing.
� Cooling effect is bad and results in high discharge temperature. In strict condition,
the compressor may be stuck.
� High temperature will accelerate the deterioration of the lubricant and shorten the
service life of the bearing. If the lubricant isn't replaced on time, it may cause serve
damage to the compressor.
Note
1) When the compressor is running, the temperature of oil should be kept
between20℃~60℃
2) When compressor stops, the oil heater needs to be switched on to make the oil
temperature above 20℃
3) When compressor is stopped for a long time, the oil heater can be switched off.
However, a great number of refrigerant may be dissolved in lubricant due to long term
stop, so the lubricant may be diluted in the lubricant and its viscosity is too low. That's
why the oil requires to be heated to 20℃ before machine start.
★ Note:Hanbell can provide the oil heater(Refer to 10.4.4).
2) Oil filter
The cleanliness of the lubricant is very important to compressors. If the welding
debris or other debris enters the compressor along with the lubricant, it would cause
damage to the bearings or the screw rotors. Thus, Hanbell requires to install an oil
filter and it must be after the cooler to ensure no new debris will enter into the
lubricant once it is filtered.
It is suggested to install a pressure difference switch to detect the pressure
drop before & after the oil filter. If the pressure drop bigger than 1.5 bar, the
compressor must be stopped for cleaning or replacing the oil filter to ensure enough
31
lubricant supply pressure and cleanliness.
★ Note:Refer to Figure 5-7 for the layout of oil filter and pressure difference switch.
3) Oil pressure difference
The oil supply to compressor is depending on the oil pressure difference. To ensure
the oil supply, it is necessary to keep the pressure difference between oil inlet and
middle pressure chamber/suction pressure above 2.5 bar.
4) Oil level protection
It is suggested to install an oil level switch in oil tank or oil sump to ensure the oil
supply.
5) Oil flow protection
To ensure the oil supply and increase the reliability, an oil flow switch is also
suggested.
★ Note:1)Refer to Figure 5-7for oil flow switch installation
2)Hanbell provides oil flow switch(refer to 10.3.1)
5.2.5 Oil Cooling System
It is normally used in high pressure ratio working condition. Under such working
condition, a lot of heat will be generated, and part of the heat will be taken away by the
lubricant, so if additional measures are not taken to cool down the lubricant, the
temperature will be over high, which cannot be able to meet the conditions of
compressor's normal operation.
Installing an external cooler is a normal way to solve the problem, which can make
the temperature of the lubricant remain at a certain reasonable range. Thus the
compressor can work properly even in strict working condition.
★ Note:
1) It is suggested to install the oil cooler near the compressor.
2)When the piping of the cooler is designed, please make sure to avoid the gas chamber formed inside
the cooler or the lubricant inside the cooler go into the oil separator or the compressor after
compressor is stopped. That's why the position of the oil cooler is normally lower than that of the
compressor and the oil separator.
3) Be sure to equip a temperature control device for the oil cooler to ensure that the oil temperature is
between 40℃~60℃.
4) A bypass way is suggested to be designed for ease the control of oil temperature. Refer to Figure
5-8&5-9&5-10.
Below are the three oil cooler layout suggested by Hanbell.
1) Air cooling type
★ Note:During heating operation, it is
avoid heat loss.
2) Water cooling type
★ Note:If the water temperature appropriate, the water is suggested to be taken from the water
inlet of the condenser to recover the oil cooler load to the hot water side.
During heating operation, it is recommended not to use the air cooling type oil cooler to
Figure 5-8. air cooling oil cooler
If the water temperature appropriate, the water is suggested to be taken from the water
recover the oil cooler load to the hot water side.
Figure 5-9. water cooling oil cooler
32
recommended not to use the air cooling type oil cooler to
If the water temperature appropriate, the water is suggested to be taken from the water
3) Refrigerant oil cooling
★ Note:Oil cooler takes liquid from the liquid pipe and returns back to compressor medium pressure
gas inlet
5.3 Motor Liquid Injection Cooling
The motor is mainly cooled down by the gas refrigerant.
from the low stage together with the gas from the economizer flows through the motor to
achieve the cooling of the motor.
However, in strict working condition, the cooling effect of gas refrigerant is not sufficient.
As a result, Hanbell designed port on the mot
the liquid refrigerant can be injected to the medium pressure cham
refrigerant enters the medium pressure chamber, it will diffuse with the air flow to realize the
cooling of the motor. Meanwhile, it guarantees the minim
working condition of the compressor.
Refrigerant oil cooling
Oil cooler takes liquid from the liquid pipe and returns back to compressor medium pressure
Figure 5-9. refrigerant oil cooling
Liquid Injection Cooling
cooled down by the gas refrigerant. The gas refrigerant discharged
together with the gas from the economizer flows through the motor to
achieve the cooling of the motor.
However, in strict working condition, the cooling effect of gas refrigerant is not sufficient.
port on the motor to assist the cooling of the
the liquid refrigerant can be injected to the medium pressure cham
refrigerant enters the medium pressure chamber, it will diffuse with the air flow to realize the
Meanwhile, it guarantees the minimum energy loss and expand the
working condition of the compressor.
33
Oil cooler takes liquid from the liquid pipe and returns back to compressor medium pressure
The gas refrigerant discharged
together with the gas from the economizer flows through the motor to
However, in strict working condition, the cooling effect of gas refrigerant is not sufficient.
to assist the cooling of the motor, from which
the liquid refrigerant can be injected to the medium pressure chamber. Once the liquid
refrigerant enters the medium pressure chamber, it will diffuse with the air flow to realize the
energy loss and expand the
34
Figure 5-11 Port for liquid injected in to cool the motor
★ Note:
1)Refer to 2.4 for the working condition that liquid injection to motor is necessary.
2)PT 100 motor temperature sensor is a standard accessory for controlling the liquid injection solenoid valve.
liquid injection to motor port
35
5.4 Economizer System
Cooling capacity and efficiency will increase by applying an economizer in front of
expansion valve to get sub cool effect. Economizer has significant effect especially in high
pressure ratio working condition.
For a two stage compressor, the economizer is even more required. Due to its two stage
design, the economizer effect is magnified. Both cooling capacity and COP increase are more
significant in two stage than those of single stage compressor. The gas supplied by the
economizer could reduce the discharge temperature of low stage therefore the discharge
temperature at high stage can be maintained. This increases the compressor performance,
reliability and widens the application limit.
Here are two typical application systems for the economizer:
5.4.1 Sub Cooler
With this form of operation, a heat exchanger (refrigerant sub-cooler) is used to
sub-cooled liquid refrigerant. The sub-cooling is achieved by injecting a part of the
refrigerant from the condenser through an expansion device in counter flow into the
sub-cooler, which then evaporates due to the absorption of heat. The superheated vapor is
pulled into the compressor at the economizer connection and mixed with the vapor, which
is already compressed in low stage.
The sub-cooled liquid is at condensing pressure with this form of operation, the pipeline
to the evaporator does not therefore require any special features, aside from insulation.
The system can be generally applied.
Figure 5-12 shows the system with economizer, sub-cooler.
Figure 5-12 Sub cooling economizer system
36
5.4.2 Flash Tank
The liquid sub-cooling is achieved with this form of operation by reducing the boiling
point pressure in an intermediate pressure vessel (flash type sub-cooler) arranged between
condenser and evaporator. This physical effect leads to the cooling of the liquid down to
the boiling point, due to evaporation of part of the liquid. To stabilize the pressure of the
vessel, a regulator is used which at the same time controls the quantity of vapor flowing to
economizer connection of the compressor.
This form of operation gives the most economical thermodynamic performance due to
direct heat exchanging. As the intermediate pressure is reduced to the boiling point
temperature this system should only be used with flooded evaporators. Figure 5-13 shows
the system with economizer, flash type sub-cooler.
Figure 5-13. Flash tank economizer system
5.5 Recommended System Layout
Figure 5-14 Recommended
Figure 5-15 Recommended system layout
System Layout
Recommended system layout- Cryopreservation
15 Recommended system layout-air source heat pump
37
Cryopreservation
air source heat pump
6. Motor Design
6.1 Motor Parameters and Design
� Motor design
Standard starting method of
6.1.1 Y-Δ Start
Y-Δ motor connects motor coil by Y connection during starting therefore reducing
voltage on coils to 1/3 of input voltage and reconnects motor coil by
starting. By doing so, we can decrease starting current thorough voltage drop, i.e.,
so-called voltage-drop starting.
Y-Δ motor connection method is shown in the following motor wiring diagram:
In Y connection, MCM, MCS are inductive while motor leads Z,X,Y
neutral connecting as Y fashion. A few seconds later (3~5 sec is recommended), MCM,
MCS become deductive. Around 0.25 sec later, MCM, MCD are inductive, it turns out
run connection.
Caution:
After Y start, MCM & MCS are deducti
inductive for Δ run. Within as transient
inappropriate action of contactors, causing trip of compressors. When it occurs, we
recommend usage of adjustable Y
MCM, MCS deduction - MCM, MCD re
micro controller or PLC program. Please refer to Y
motor is not powered during Y-
Motor Parameters and Design
Standard starting method of Hanbell LT series screw compressor is
Δ motor connects motor coil by Y connection during starting therefore reducing
voltage on coils to 1/3 of input voltage and reconnects motor coil by
starting. By doing so, we can decrease starting current thorough voltage drop, i.e.,
drop starting.
Δ motor connection method is shown in the following motor wiring diagram:
In Y connection, MCM, MCS are inductive while motor leads Z,X,Y
neutral connecting as Y fashion. A few seconds later (3~5 sec is recommended), MCM,
MCS become deductive. Around 0.25 sec later, MCM, MCD are inductive, it turns out
After Y start, MCM & MCS are deductive for 0.25 sec and then MCM & MCD are
Δ run. Within as transient as 0.25 sec, pseudo short circuit might occur due to
inappropriate action of contactors, causing trip of compressors. When it occurs, we
recommend usage of adjustable Y-Δ dedicated timer or slightly lengthen span of time for
MCM, MCD re-induction from 0.25 sec to 0.5 sec max directly in
micro controller or PLC program. Please refer to Y-Δ shift time diagram for details. Because
-Δ shift, shorter Y-Δ shift span is suggested to prevent second
38
series screw compressor is Y-Δ start.
Δ motor connects motor coil by Y connection during starting therefore reducing
voltage on coils to 1/3 of input voltage and reconnects motor coil by △ connection after
starting. By doing so, we can decrease starting current thorough voltage drop, i.e.,
Δ motor connection method is shown in the following motor wiring diagram:
In Y connection, MCM, MCS are inductive while motor leads Z,X,Y are tied together as a
neutral connecting as Y fashion. A few seconds later (3~5 sec is recommended), MCM,
MCS become deductive. Around 0.25 sec later, MCM, MCD are inductive, it turns out △
ve for 0.25 sec and then MCM & MCD are
as 0.25 sec, pseudo short circuit might occur due to
inappropriate action of contactors, causing trip of compressors. When it occurs, we
ated timer or slightly lengthen span of time for
to 0.5 sec max directly in
Δ shift time diagram for details. Because
Δ shift span is suggested to prevent second
39
start due to decreased rotation speed. However, if Y-Δ shift span is too short,
aforementioned pseudo short circuit might occur.
Full load Amper
Starting
Current
Time
I (AMP)
Y- shift time 0.25~0.5sec
Figure 6-2. Y-△ transaction time diagram
� Y-Δ start features
1. Starting current in Y connection is 1/3 of lock rotor ampere.
2. Starting torque in Y connection is 1/3 of lock rotor torque.
3. Acceleration of motor rotor becomes smaller at full-load starting, therefore compressors
require starting at partial load.
� Except for Y-Δ start, concerning soft start or reactance start, please kindly contact
Hanbell for further information.
6.1.2 Power source requirement
� Power limitation
� Voltage limitation
Long term operation:within ±5% of rated voltage
Instant operation:within ±10% of rated voltage
� Frequency:within ±2% of rated frequency
Caution:
Note: In the region where the electricity power is unstable, install an additional hi-low
voltage protector with ± 5% tolerance of normal voltage to ensure safe operating of the
compressor.
� Unbalanced voltage
Unbalanced voltages usually occur because of variations in the load. When the load
on one or more of the phases are different from the other(s), unbalanced voltages will
40
appear. This can be due to different impedances, or type and value of loading in each
phase. Unbalanced voltages can cause serious problems, particularly to the motor.
� NEMA defines voltage unbalance as follows :
Percent voltage unbalance = 100% x
� NEMA states that poly-phase motors shall operate successfully under running conditions
at rated load when voltage unbalance at the motor terminals does not exceed 1%. Furthermore,
operation of a motor with over 5% unbalance is not recommended for it probably results in
motor damage.
Unbalanced voltages at motor terminals cause phase current unbalance ranging from 6 to 10
times the percent of voltage unbalance for a fully loaded motor. This causes motor over
current resulting in excessive heat that shortens motor life, and hence, eventual motor burnout.
If the voltage unbalance is great enough, the reduced torque capability might not be adequate
for the application and the motor will not attain rated speed.
6.1.3 MCC&LRA
Model Start current LRA(A)Y-△
Maximum continues current
MCC(A)
LT-S-20/10 420/140 115
LT-S-30/12 620/206 170
LT-S-45/20 810/270 241
LT-S-55/25 875/292 268
LT-S-65/32 1430/477 305
LT-S-83/41 1430/477 404
Model Start current LRA(A)Y-△
Maximum continues current
MCC(A)
LT-S-20/10-H 880/294 160
LT-S-30/12-H 950/316 235
LT-S-45/20-H 1675/558 310
LT-S-55/25-H 1675/558 380
LT-S-65/32-H 2625/875 450
LT-S-83/41-H 2625/875 580
Table 6-1. MCC&LRA
1) Above data based on 380V, 50Hz power supply.
2) The LRA&MCC data above has nothing to do with the refrigerant or working
(maximum voltage deviation from average voltage)
(average voltage)
41
condition.
42
Temperature
display module
Warning Light
Power Light
Control relay connection
Connection to discharge PTC
Connection to 3 phase main
power supply
Motor protector power
Motor embedded PTC temperature
sensor terminal
Motor embedded Pt100
temperature sensor terminal
Control output to liquid
injection solenoid valve
6.1.4 Terminal cover plate.
Figure 6-3.Terminal cover plate connection diagram
Table 6-2. Nuts specifications for bolt on terminal cover plate
Model Specification
Torque
(N.m)
Model Specification
Torque
(N.m)
LT-S-20/10 M12 nut 35
LT-S-20/10-H M12 nut 35
LT-S-30/12 M12 nut 35
LT-S-30/12-H M12 nut 35
LT-S-45/20 M12 nut 35
LT-S-45/20-H M12 nut 35
LT-S-55/25 M12 nut 35
LT-S-55/25-H M12 nut 35
LT-S-65/32 M12 nut 35
LT-S-65/32-H M12 nut 50
LT-S-83/41 M12 nut 35
LT-S-83/41-H M12 nut 50
43
6.1.5 Terminal box
An IP54 terminal box is provided as standard accessory. Please refer to below diagrams for
dimensions.
LT-45/20,LT-55/25, LT-65/32, LT-83/41
LT-20/10, LT-30/12
Figure 6-4 Terminal Box Dimension
44
7. Compressor installation
7.1 Open compressor wooden crate
Upon receiving the compressor, please check if the crate is intact, and compressor is in
good condition. Please also check accessories and documents to be consistent with order.
Caution:compressor is charged with 0.5~1bar of nitrogen before delivery. Please release
the interior pressure before dismantling any parts on compressor.
7.2 Compressor Lifting
When lifting the compressor, it is recommended to use a steel chain or steel cable.
Make sure that chains, cables or other lifting equipments are properly positioned as shown
below to protect the compressor and its accessories from damaging. Keep the compressor
in horizontal position when lifting, and prevent it from crashing or falling on the ground,
hitting the wall or any other accident that may damage it or its accessories.
Caution:
1) Please ensure the steel cable weight load is sufficient.
2) Check the steel cable and hook before lifting, making sure there is no deform or crack
to avoid accident.
3) Ensure sufficient space for lifting.
Figure 7-1 compressor lifting
45
7.3 Compressor installation
The installation of the compressor in the refrigeration system should be accessible and
make sure that the compressor is away from the heat source to prevent heat radiation. The
compressor should also be installed as close as possible to the electrical power supply for
easier connection. It is necessary to keep good ventilation and low humidity condition in
the site. Make sure that the frame or supporter is strong enough to prevent excessive
vibration and noise while the compressor is running and must reserve enough space for
compressors’ future maintenance work.
Compressor should be installed horizontally. Meanwhile, it is recommended to install
mounting pad to avoid the compressor from delivering vibrations to the piping.
The compressor anchor holes (NO.1~4) are chosen as in figure 7-2&7-3.
1. LT-83/41 , LT-65/32
1
Figure 7-2 LT-83/41 & LT-65/32 anchor holes
2. LT-45/20, LT-55/25
Figure 7-3 LT-45/20<-55/25 anchor holes
46
3. LT-20/10, LT-30/12
Figure 7-4 LT-20/10<-30/12 anchor holes
47
8. Operation and maintenance
8.1 Compressor commissioning check
8.1.1 Check list before Start up
Items Check point States or standard values
1.Compressor
and
accessories
1. Oil level of external oil
separator
2.Oil temperature
3.Open stop valves
4.Open motor liquid
injection port(angle valve)
1. High oil level window filled.
2. Before start up, heat up the oil to 40℃/
heating time is around 8Hrs.
3. Open caps of stop valves to check.
4. Open cap of angle valve cap to check.
2.Power
system
1. Voltage of main power
2. Voltage of control circuit
3. Insulation resistance
value of the motor
between phase to phase
and phase to ground.
4. Power terminals and
wire cables’ terminals
connection.
5. Grounded
6. Settings of switches,
sensors and controllers.
1. Main power voltage fluctuation range
within ±5%. Instant voltage drop during
start up is less than 10%;
2. Voltage of auxiliary power is 220V±10%.
3. Resistance value should exceed 50MΩ.
4. Power terminals are firmly fixed on
terminal block and well insulated. Keep
wire cables away from heat source and
sharpened metal. Power terminals are fixed
firmly and well insulated. Terminal screw
and block are both required.
5. Installation confirmation.
6. Check original value of design.
3.Piping
system
1. Check the piping is
firmed.
2. Check if there is any
leakage.
1. Observation or manual check.
2. Apply leakage test liquid to check
especially on connections and welding
junctions.
4.Protection
devices
1. Winding temperature
2. Discharge temperature
3. Oil level switch
4. PT100 motor
temperature sensor
1. Not active(close circuit)
2. Not active(close circuit)
3. Oil is full(close circuit)
4. Same or close to environment
temperature.
Table 8-1 Start up check list
48
8.1.2 Check list during operation
1)Start up compressor for 0.5~1 second. Confirm the rotation direction through
monitoring suction and discharge pressure.(correct rotation direction: suction pressure
goes down and discharge pressure goes up at the same time)
2)Check if the oil sight glass on external oil line is full of lubricant after start up. In case
of abnormal, please check pressure difference (oil pressure differential supply), oil
filter and oil line solenoid valve.
3)There will be some oil foams in the oil separator during start up but only in a short
time. When working under rated working condition, the foam will disappear.
Otherwise it means the system is without sufficient oil or there is oil carryover
problem.
4)Compressor’s operating working condition adjustment as follows: suction superheat
shall be within 15K; for low temperature use (R22/R404A), discharge superheat shall
be 25K above condensing temperature. For high temperature use (R134a), discharge
superheat shall be 15K higher than the condensing temperature.
5)The whole system should pass vibration test, especially the piping. If there is
abnormal vibration and noise from compressor, please contact HANBELL.
6)Below items need to be checked every day, when compressor is operating in a long
time: Compressor running data such as 3 phase voltage, current, etc. Oil temperature,
oil level, all the sensors, wiring junctions, and oil line window.
7)When condensing unit operates in job site, we should beware of its complementary
devices and the maintenance schedule after first commissioning.
8)To keep the lubricant viscosity normal at low ambient temperature and to ensure the
function of bearing lubrication, it is suggested to keep the oil heater in the external oil
separator “on” after compressor is turned off. This is to prepare for the next start up.
9)In the running state of the compressor, the liquid supply valve shall not be closed for
evacuation.
49
8.2 Trouble shouting table
Issue Possible Reason
Motor temperature
sensor trip
1. Motor over load, liquid injection solenoid valve malfunctions.
2. Motor temperature sensor switch malfunction.
3. Power system malfunction
4. Defective motor coil.
5. Liquid injection expansion valve malfunctions.
Poor Motor
Insulation
1. Motor line connector wet dew.
2. Defective Motor.
3. Defective power bolts.
4. Defective magnet contactor.
5. Acid in the system deteriorates the insulation
6. Long term running at high temperature cause motor insulation
deterioration.
7. Frequent start up.
8. Too much water content in the refrigerant.
Motor unable to
start up or
switch
1. Inlet solenoid valve failure, which leads to compressor start up at full
load
2. Voltage is too low or wrong.
3. Too much voltage drop, and the magnet contactor s can’t induct.
4. Motor malfunction
5. Phase loss or phase reverse
6. Motor protection switch is active.
7. Wrong connection of motor terminals.
8. Timer of Y−△ starting malfunctions.
9. Capacity of over load relay is too small.
10. Magnet contactors malfunction.
Abnormal
vibration or noise
1. Bearings are damaged.
2. Liquid compression.
3. Overheated rotors touch each other or touched the chamber
4. Oil loss causes bad lubrication effect.
5. Inner parts are loose.
6. Defective piping causes resonance.
7. Objects enter the compression chamber
Reverse time of the
rotor is too long
1. Stop action is not set in control logic.
2. The suction check valve stuck, cannot be closed
Discharge
temperature is too
high
1. Suction superheat is too high. (less refrigerant volume or expansion
valve malfunctions)
2. High pressure side is abnormal. (bad cooling effect, air penetrates in
the system, temp. of cooling water is too high, cooling water flow is
50
Table 8-2. Trouble shooting
too less, heat exchange capability of condenser is bad.)
3. Compression ratio is high without liquid injection.
4. Bearings are damaged. Rotors friction.
5. Oil loss or oil level is too low.
6. Suction check valve malfunctions.
System low
pressure alarm
1. Lack of refrigerant
2. Evaporator frosts seriously, and affects the heat exchange.
3. Opening of expansion valve is too small.
4. Suction filter is blocked by ice or debris.
5. Capacity of evaporator is too small.
6. Wrong setting of the low pressure protection.
System high
pressure alarm
1. Too much refrigerant.
2. Condenser is blocked by debris, dust or penetrated by air.
3. Discharge temperature is too high.
4. Expansion valve is blocked by ice or debris.
5. The capacity of condenser is too small.
6. Wrong setting of high pressure protection.
Oil flow alarm
1. Oil flow switch malfunctions.
2. The condensing pressure is not built up.
3. Oil line blocked.
4. Oil line solenoid valve malfunctions.
Discharge
temperature is too
low
1. Liquid compression.
2. Temperature of returned oil is too low.
3. Opening of liquid line expansion valve is too large.
4. Opening of economizer expansion valve is too large.
Oil carry over
1. Discharge temperature is too low.
2. Demister of oil separator malfunctions.
3. Oil temperature is too low(oil heater is not switched on)
4. Liquid compression.
5. Opening of economizer expansion valve is too large.
9. Dimensions
9.1 LT-S-20/10
51
9.2 LT-S-30/12
52
9.3 LT-S-45/20<-S-55/25
53
9.4 LT-S-65/32& LT-S-83/41
54
9.5 LT-S-20/10-H& LT-S-30/12-H
55
9.6 LT-S-45/20-H& LT-S-55/25-H
56
9.7 LT-S-65/32-H& LT-S-83/41-H
57
58
10. Accessories
In order to provide customers with an overall solution, HANBELL
design standard accessories and optional accessories according to
different application requirements to ensure that the compressor can
be safe, stable operation, and achieve the highest efficiency.
10.1 Accessory list
Accessory list-LT series ● Standard
△ Optional
Item Description Qty Single In parallel
1 Protection module 1 ● ●
2 Suction shut-off valve 1 ● ●
3 Discharge shut-off valve 1 ● ●
4 Economizer shut-off valve 1 ● ●
5 Suction flange bushing 1 ● ●
6 Discharge flange bushing 1 ● ●
7 Economizer flange bushing 1 ● ●
8 Suction check valve 1 ● ●
9 Economizer check valve 1 ● ●
10 Suction filter(suction side) 1 ● ●
11 Suction filter(middle pressure side) 1 ● ●
12 Pressure difference switch(manual reset) 1 ● ●
13 Mounting pad 8 ● ●
14 Minimum pressure valve 1 ● ●
15 Flow switch 1 ● ●
16 Hanbell special oil 1 △ △
17 Solenoid valve oil circuit 1 △ △
18 Oil heater 300W 1 △ △
★ Note:
The standard quantity of minimum pressure valve for single and compressor in
parallel is one. Please refer to Table 5-1. Pressure Maintenance Valve configuration
Single & in Parallel
10.2 Accessory for gas refrigerant line
10.2.1 Shut-off valve
For easy maintenance
discharge, and economizer s
specification are shown below:
Accessory for gas refrigerant line
valve
maintenance & repair, it is suggested to install suction,
discharge, and economizer shut-off valve. Dimension and
are shown below:
10-1. Shut-off valve diagram
59
, it is suggested to install suction,
valve. Dimension and
Figure 10
*Specification of shut-
Model
LT-20/10
LT-30/12
LT-45/20
LT-55/25
LT-65/32
LT-83/41
10.2.2 Flange bushing
Standard flange bushing
Model Discharge
Steel
LT-20/10 2
LT-30/12 2
LT-45/20 2 1/2
LT-55/25 2 1/2
LT-65/32 2 1/2
LT-83/41 2 1/2
Figure 10-2. 5" Suction shut-off valve
-off valve
Size
Suction Discharge Economizer
3" 2"
3" 2"
4" 2 1/2"
4" 2 1/2"
5" 2 1/2"
5" 2 1/2"
Flange bushing
Standard flange bushing-LT series
Discharge Suction Economizer
Copper Steel Copper Steel
2 1/8” 3 3 1/8” 1 1/2
2 1/8” 3 3 1/8” 1 1/2
2 5/8” 4 3 5/8” 2
2 5/8” 4 3 5/8” 2
2 5/8” 5 4 1/8” 2
2 5/8” 5 4 1/8” 2
60
Economizer
1 1/2"
1 1/2"
2"
2"
2"
2"
Economizer
Copper
1 5/8”
1 5/8”
2 1/8”
2 1/8”
2 1/8”
2 1/8”
61
★Note :Above table lists the standard flange bushing sizes the LT series of Hanbell.
Their size specifications are shown in the table below. If the specification of the
flange bushings are not specified in order, Hanbell will provide standard flange
bushing as written in above table..
If non-standard flange bushing is required, please contacts Hanbell sales
representative when purchasing the compressor.
LT flange bushing size and specification
Figure 10-3 flange bushing
Model Locaiton Diameter &
material
Dimension
A B C D E
LT-20/10
LT-30/12
Discharge Copper 2 1/8"
50 90 30 55 65
Steel 2" 61.3 74
Suction Copper 3 1/8"
66 120 45 80.5 90
Steel 3" 90.2 103
Economizer Copper 1 5/8"
52 75 35 42 52
Steel 1 1/2" 49.3 64
LT-45/20
LT-55/25
Discharge Copper 2 5/8"
60 110 35 68 77
Steel 2 1/2" 77 90
Suction Copper 3 5/8"
76 145 50 93 103
Steel 4" 110 128
Economizer Copper 2 1/8"
50 90 30 55 65
Steel 2" 61.3 74
LT-83/41 Discharge Copper 2 5/8" 60 110 35 68 77
62
LT-65/32 Steel 2 1/2" 77 90
Suction Copper 4 1/8" 80
174 35 106 121
Steel 5" 75 135 154
Economizer Copper 2 1/8"
50 90 30 55 65
Steel 2" 61.3 74
63
10.2.3 Check valve
The discharge check valve on Hanbell LT series compressor
belongs to horizontal type. When the compressor is stopped, the teflon
valve plate will be pushed by spring force to close the opening. This
reduces the time of reverse rotation to protect the compressor.
1)Economizer check valve(Horizontal type)
Figure 10-4. Economizer check valve
Size
Dimension: mm
A B C D E F G H I
2” 102 6 53 69 91 65 90 85 5
2 1/2″ 122 6 69 89 111 85 110 97 5
3″ 138 6 80 99 121 95 120 108 5
4″ 163 6 96 124 146 120 145 123 5
2)Discharge check valve(Horizontal type)
64
Figure 10-5 Discharge check valve
Size Dimension: mm
A B C D E F G H I J
1 1/2″ 86 4 55 59 76 42 60 75 80.5 6
2” 102 4 65 69 91 53 70 90 85 6
2 1/2″ 122 4 85 89 111 67 90 110 97 6
3″ 138 4 95 99 121 80 100 120 108 6
4″ 163 4 120 124 146 96 125 145 123 6
6” 238 5 190 195 216 146 190 215 160 6
★Note: the size of the check valve is same to that of the shut-off valve. Refer to
10.2.1
10.2.4 Minimum pressure valve
The minimum pressure valve
establish enough high and low pressure difference in a short time
the compressor is started.
minimum pressure valve
compressor. Thus, the compressor capacity adjustment and loading is
smooth, so it's especially suitable for the air
the compressor which has
which is caused by the
also has the function of
minimum pressure valve will
connection to the exhaust pipe to p
backflow into the compressor, so as to avoid the long
the compressor effectively.
Figure 10
Specification Pressure difference open
1.5" 3.6±0.3Bar
Minimum pressure valve
minimum pressure valve can make the compressor quickly
establish enough high and low pressure difference in a short time
the compressor is started. When the compressor starts running,
minimum pressure valve ensures the internal oil supply pressure of the
compressor. Thus, the compressor capacity adjustment and loading is
especially suitable for the air-cooled heat pump and
or which has insufficient supply pressure differential
which is caused by the seasonal reasons. The minimum pressure valve
has the function of check valve. When the compressor stops,
minimum pressure valve will quickly cut off the compressor's
nection to the exhaust pipe to prevent the high-pressure gas
into the compressor, so as to avoid the long-term reversal of
the compressor effectively.
Figure 10-6. Minimum pressure valve
Pressure difference open Temperature range
3.6±0.3Bar <120℃
65
can make the compressor quickly
establish enough high and low pressure difference in a short time once
the compressor starts running, the
supply pressure of the
compressor. Thus, the compressor capacity adjustment and loading is
cooled heat pump and
insufficient supply pressure differential
minimum pressure valve
check valve. When the compressor stops, the
the compressor's
pressure gas
term reversal of
Pressure loss
<0.1Bar
2"
2.5"
3"
4"
5"
6"
Size
1.5inch
2 inch
2.5 inch
3 inch
4 inch
A B C D E F
235 93 119 76 109 M16
247 105 126 91 122 M16
300 110 136 111 134 M16
364 122 156 121 153 M20
413 165 166 146 171 M20
66
G H
75 18
90 18
110 18
120 22
145 22
10.3 Oil line accessory
10.3.1 Oil flow switch
An oil flow switch should be installed in the oil returned line
external oil separator
drawing and specification of the oil switch is shown below.
Specification:
Type
3/8” flow switch
5/8” flow switch
1” flow switch
Oil line accessory
10.3.1 Oil flow switch
An oil flow switch should be installed in the oil returned line
external oil separator is installed to protect the compressor.
drawing and specification of the oil switch is shown below.
Dimension Connector
3/8” flow switch DN10 3/8〃
5/8” flow switch DN16 5/8〃
1” flow switch DN25 1〃
67
An oil flow switch should be installed in the oil returned line if the
compressor. The
drawing and specification of the oil switch is shown below.
Connector
68
Figure 10-7. Oil flow switch drawing
Parameters:
� Maximum working
temperature:100℃
� Minimum flow protection: 0.7L/min
� Protection class: IP65 � Maximum working pressure
difference at max. flow:0.01bar
� Maximum current: 5A � Maximum voltage:250VAC
� Maximum voltage:250VAC � Minimum flow protection: 0.7L/min
� Maximum working pressure
difference at max. flow:0.01bar
10.3.2 External oil filter
The oil filter is 300 mesh and can be reused by cleaning.
Figure 10
Specification
3/8”(Φ10)
5/8”(Φ16)
1”(Φ25.5)
� Structure
1.Bolts
6.O-ring
Figure 10-8. External oil filter drawing
A(mm) B(
89 340
89 345
140 370
Specification of external oil filter
2.Cover 3.Gasket 4.Spring
ring 7.Oil inlet 8.Body 9.Oil
69
(mm)
340
345
370
5.Filter core
10.Angel
� Maximum working temperature:105℃
� Power source:220V/ 50Hz
10.3.3 Oil line solenoid valve
10.3.4 Oil pressure differential switch
� Function:Detect the pressure drop before and after the oil filter. If
the pressure drop reaches
to prevent the excessive
which will damage the
� Specification:Hanbell s
can be reset manually
� Instructions:For single
high pressure connector (HP) of the pressure differential switch is
connected to the high pressure connector of the compressor (high
pressure angle valve or discharge oil separator side angel valve) ; the
low pressure connec
the compressor. When the oil resistance exceeds the set valve (1.5
bar), the pressure differential switch (OFF) cut off the compressor
control circuit to remind the user to clean the filter
connected in parallel or single compressor with external oil line, the
oil pressure differential switch shall be installed the inlet and outlet
of the external oil filter. When the circuit is cut off, please clean or
change the oil filter.
Maximum working temperature:105℃
Power source:220V/ 50Hz
Oil line solenoid valve
Oil pressure differential switch
Detect the pressure drop before and after the oil filter. If
reaches the trip point, the switch will be activ
excessive debris to be absorbed at the filter film,
will damage the oil supply problem.
Hanbell standard trip value is 1.5 bar and
nually.
For single compressor without external oil line, the
high pressure connector (HP) of the pressure differential switch is
connected to the high pressure connector of the compressor (high
pressure angle valve or discharge oil separator side angel valve) ; the
low pressure connector (LP) is connected to the oil filter flange of
the compressor. When the oil resistance exceeds the set valve (1.5
bar), the pressure differential switch (OFF) cut off the compressor
control circuit to remind the user to clean the filter. For compressors
connected in parallel or single compressor with external oil line, the
oil pressure differential switch shall be installed the inlet and outlet
of the external oil filter. When the circuit is cut off, please clean or
change the oil filter.
Directional arrow at the
bottom“ ”
70
Detect the pressure drop before and after the oil filter. If
the switch will be activated
to be absorbed at the filter film,
tandard trip value is 1.5 bar and the valve
without external oil line, the
high pressure connector (HP) of the pressure differential switch is
connected to the high pressure connector of the compressor (high
pressure angle valve or discharge oil separator side angel valve) ; the
tor (LP) is connected to the oil filter flange of
the compressor. When the oil resistance exceeds the set valve (1.5
bar), the pressure differential switch (OFF) cut off the compressor
compressors
connected in parallel or single compressor with external oil line, the
oil pressure differential switch shall be installed the inlet and outlet
of the external oil filter. When the circuit is cut off, please clean or
Directional arrow at the
Figure 10
10.4 Electrical accessory
10.4.1 INT-69HBY motor protector
The INT69 HBY motor protection module is developed for
monitoring the motor
phase lack of the compressor.
The major functional descriptions are as follow:
1. When the supply voltage has been connected,
closes after three second
are below their critical temperature
2. If any one of the internal series thermistor
critical value, the motor protector will be disconnected
3. Press the reset button for 5 seconds to cancel lock protection.
4. In order to avoid tripping caused by reversal of the compressor
because of machine
keep for 20 seconds when the compressor
5. An LED (light emitting diode) (red / green) display
information.
6. Use N/O dry contact relays,
good.
7. The sensor and the supply circuit should be well insulated.
8. The motor prot
frequency drive device.
Technical Data
Figure 10-10. Pressure differential switch
Electrical accessory
69HBY motor protector
The INT69 HBY motor protection module is developed for
monitoring the motor winding temperature, phase sequence and
e compressor.
he major functional descriptions are as follow:
the supply voltage has been connected, the output relay
seconds initialization. At that time all thermistors
are below their critical temperature.
If any one of the internal series thermistor resistance exceeds the
motor protector will be disconnected and locked.
Press the reset button for 5 seconds to cancel lock protection.
In order to avoid tripping caused by reversal of the compressor
because of machine stop, the phase monitoring function can only
keep for 20 seconds when the compressor stops and starts reverse.
An LED (light emitting diode) (red / green) display
se N/O dry contact relays, and its external conditions should
The sensor and the supply circuit should be well insulated.
he motor protection module cannot be used for variable
frequency drive device.
Technical Data
� In normal c
� When pressure difference reach
point,
� When pressure difference is under
set point, push the manual reset
button and 1
71
The INT69 HBY motor protection module is developed for
winding temperature, phase sequence and
the output relay
ll thermistors
resistance exceeds the
and locked.
Press the reset button for 5 seconds to cancel lock protection.
In order to avoid tripping caused by reversal of the compressor
stop, the phase monitoring function can only
stops and starts reverse.
An LED (light emitting diode) (red / green) displays the
external conditions should be
The sensor and the supply circuit should be well insulated.
not be used for variable
In normal case 1-2 is connected.
When pressure difference reaches set
, 3-4 are connected.
When pressure difference is under
set point, push the manual reset
button and 1-2 will be connected.
72
Supply voltage /
double voltage
AC 50/60Hz 115/120V -15…+10% 3VA
AC 50/60Hz 230/240V -15…+10% 3VA
Temperature
monitoring PTC,to DIN 44081/082
Phase monitoring 3AC 50/60Hz 200...575V+10%
Reverse phase Lock
Phase loss Lock
Relay Max.AC 240V, max.2.5A, C300
Min. >24V AC/DC, >20mA
Figure 10-11. INT69 HBY&PTC Wiring
Note: Above drawing is only the wiring for protection module not
the compressor method.
10.4.2 Oil heater 300W
Each Hanbell compressor is equipped with UL certified 300W
oil heater as standard accessory. Restart the compressor after the
long time shut down, please keep the oil heater open for more than 8
hours to ensure the internal temperature of the compressor is higher
than the system temperature and the ambient temperature, avoiding
the poor lubrication effect caused by lubricating oil viscosity too
low.
73
Specification:300W;220V;IP54;UL certificate.
74
10.5 Other accessory
10.5.1 Mounting pad
To reduce the vibration level, mounting pads are suggested
for installation. The torque value to tighten the mounting pad:20~
30N·m.
Note: The anchor of the compressor is shown in Figure 7.3.
� Specification of the mounting pad:
压缩机减振垫
Figure 10-12. Compressor mounting pad
� Mounting pad specification table:
Item A(mm) B(mm) C(mm) D(mm) E(mm) Model
1 50 55 20 20 20 LT-20/10<-30/12
2 80 100 20 25 25 LT-65/32<-83/41
LT-45/20<-55/25