Controller for controlling evaporators AKC 114 -...

REFRIGERATION AND AIR CONDITIONING

Controller for controlling evaporatorsAKC 114 - 116, AKC 121

Technical Brochure

2 Technical brochure RC1HC802 © Danfoss 03/2003 AKC 114 - 116, AKC 121

The controllers described in this brochure belong to the AK 100 series comprising evaporator controls for refrigeration appliances and small coldrooms. A system consists of the following components: controller, valve and sensors. The system, on the whole, replaces all other automatic controls, as it contains an injection function for optimum utilisation of evaporators, day and night thermostats, defrost function, fan control, rail heat control, light control, alarm function, and so on.

The controller works in conjunction with an electrically operated valve which will either be an expan-sion valve or a solenoid valve.Pt 1000 ohm temperature sensors, with great signal accuracy are used for measuring temperatures. Depending on the application selected, anywhere from 3 to 5 sensors are used per regulated evapora-tor.

Introduction

• Energy savings at- Adaptive setting of the expansion valve means optimum utilisation of the evaporator.- Controlled power consumption for rail heat and evaporator fan.- Adaption of condenser pressure. The compressor uses less power.- Defrost based on demand

• Better product qualityGreater temperature accuracy.

• Designed for the futureThe flexible design of the system makes it easy to add more controllers if the refrigeration plant has to be extended.

• PC connectionIn this way central operation and data collection are made possible.

• Service functionTemperatures and functions are monitored constantly. All controllers contain a service function that will help identifying faults in case of alarms.

• Simple mountingSystem-adapted components make it easy to mount them, to run them in, and to service them.

• Choise of refrigerantAll fluorinated refrigerants may be used (also blends). And ammonia, when an AKVA valve is used.

• One valve - two functionsThe AKV valve functions as both expansion valve and solenoid valve.

Advantages

The system can be used on all refrigerating plant.For instance in:

• Refrigeration appliances

• Cold rooms

• Air conditioning plant

Application

AKC 114 - 116, AKC 121 Technical brochure RC1HC802 © Danfoss 03/2003 3

Controller types

AKC 114This controller is a complete refrigeration appliance control with functions for the control of one evaporator in one medium temperature/low temperature appliance.The controller is specially suited for gas defrost.

AKC 115-116 are extended refrigeration controls like AKC 114, but they can control two and three evaporators in the same refrigeration appliance, respectively.

AKC 114D-116D Like AKC 114-116, but with slightly different functions, e.g. internal night clock and defrost on demand.

AKC 114A-116A Primarily as the D version, but with slightly different functions.In this series the evaporating pressure is measured with a pressure transmitter.

AKC 114F - 116FPrimarily as the D version, but with slightly different functions.In this series an output for light control is used, and the signal for start/stop is a 24 V signal.

AKC 121AThis controller does not have an expansion valve function, but instead two thermostat functions. In other respects many of the functions are common to the above described controllers.The controller is particularly suited for systems with indirect refrigeration.

AKC 121BPrimarily as the AKC 121A version, but with slightly different functions.In this controller there is functions for light control and input signals from door switches.The controller is particularly suited for room control in systems with indirect refrigeration.

The individual controllers are refrigeration controls containing the required functions for the control of medium temperature/low temperature appliances or rooms. There are several controller series, each with their own different functions depending on their field of application.

A survey of the different control versions and their functions is shown on page 10.

Operation can take place from a central place, either with control unit type AKA 21 or from a connected PC.


Standard functions All controllers contain the following functions:

Data transmission The individual regulators are normally placed in the individual refrigeration applicances. Operation of the regulators takes place via a separate control unit, type AKA 21. The control unit loacted at a central place, for instance outside of the shop itself. All regulators are interconnected by means of a two-core cable. When this connection has been established, all data communication takes place between the control unit and the regulators via this cable. A PC may also be connected to the system. In this way it is possible to operate the system and to collect all operational data via the PC. Sockets for connection of AKA 21 may be placed at any point of the data communication cable giving access to any connect-ed regulator.

Day thermostat In the controller you may choose between two thermostat functions -an OFF/ON thermostat or a modulating thermostat.

When the air temperature at the media temperature sensor equals the set value the controller will stop the refrigeration and close the valve. When two air sensors (S3 and S4) are used, regulation may be based on the temperature differential across one of the evaporators.

Night thermostat Refrigeration appliances are often covered during the night. This covering lowers the temperature in the refrigeration appliance.

The night setback value, by which the controlled temperature has to be increased to offset the lower air temperature, is set on the controller. Change-over to night operation takes place with an internal or external signal.

Alarm thermostat The alarm is activated when the media temperature is too high or too low. Alarm limits and time delays can be set at your option. Actual alarms and the nature of the alarm are shown directly on the operating unit.

Alarm function A built-in alarm function constantly keeps an eye on the sensors, the valves, the liquid flow and the regulating functions. If faults are registered, an alarm signal is given. If the controller is not capable of controlling the liquid injection on account of a defective fan, or the like, the alarm will sound.

Service/diagnosis The controller is equipped with a service/diagnosis system. The function is used in connection with start-up or alarm. By going through the service function, all system components are easily checked.

Display signal A display can be connected which will show the air temperature at the evaporator. When refrigeration is cut out in connection with a defrost, this will be indicated in the display. Each section can be con-nected to a display.

Sensor correction All measurements from the temperature sensors can be corrected, to compensate for long wires.

Defrost start Activation of the defrost function can be arranged with an external signal (pulse signal) or by using the internal clock function.

Defrost stop Defrost stop is based on temperature registration or on a fixed set time. The defrost sensor measures the evaporator’s surface temperature. When the temperature equals the set value, the defrost will stop in the section concerned. If the defrost cycle exceeds the programmed defrost period, the defrost will stop and the alarm will sound.


Fan control This function permits cycling operation of the fan. The function is only activated during night opera-tion, and when the thermostat is cut out. On/off periods for fan operation can be set on the control panel.

Rail heat control The function cuts the required power for any connected rail-heating element in and out. On/off periods can be set on the control panel.

Access code Two types of access code can be defined which will subsequently limit the access to the controller. Code 1 will give access to a limited part of the unit’s functions.Code 2 will give access to all the unit’s functions.

Master function The controller can be overridden from a central master function on the following functions: night operation, stop of regulation, displacement of thermostat reference and displacement of alarm limit.The override signal is transmitted via DANBUSS.


Special functions The following functions are not standard in all controllers. See the survey on page 10.

Expansion valve There are two ways of controlling the liquid supply to the evaporator:

1) The liquid supply is controlled by signals from three AKS sensors (S1, S2 and an air sensor, that can be placed in front of the evaporator, or behind it). The sensors register the differ-ence between the temperature at the evapo-rator's outlet (S2) and the temperature at the evaporator's inlet (S1). Compared with the air temperature the sensors form a signal so that the superheat is continously held to a minimum, whatever the operating conditions.

2) Instead of registering the evaporating tempera-ture with the S1 sensor, it is registered by means of a pressure transmitter. This signal may be used by several controllers from the same series (max. five).

There are no settings for the regulation of the superheat. The controller itself will arrange for the optimum evaporator charge.

MOP function The injection of liquid is kept at a minimum until the compressor has lowered the evaporating pres-sure to a safe level. The evaporating pressure is registered and compared with the MOP value. The normal expansion valve function will not start until the evaporating pressure is lower than the MOP value.

AKV valve The AKV valve both functions as expansion valve and solenoid valve. The valve opens and closes by a signal from the controller or by an external signal sent to if from a defrost timer, thermostat or the safety controls.

Solenoid valve This valve must be used in conjunction with AKC 121 which only controls temperatures.

Defrost type The standard version of the controllers can control an electric defrost. Some of the controllers are

furthermore provided with connections and setting options, so that they can carry out gas defrosts. Defrost stop can be made by means of temperature registration (e.g. with the S1 sensor when there is

gas defrost, and the S5 sensor when there is electric defrost). During defrost the fan may be stopped. After defrost, the “delayed fan start” function or delayed injec-

tion function may be used, for instance after defrost in freezer cabinet.

Defrost based on demand The function checks whether a planned defrost is to take place, or whether it can be

skipped.It will then be required that the following functions are used: thermostat function, internal defrost clock, and that the defrost is stopped via the selected defrost sensor.

Language The controller’s menus are shown with a brief text of 10 characters. From the factory this text is in English. With a setting, this text can be changed to another language (see survey on page 10).


TEV function The electronic injection function can be disconnected. Control of the injection will then take place with a thermostatic expansion valve and a solenoid valve. The solenoid valve is connected to the con-troller’s AKV output. The thermostat function will now have ON/OFF control of the solenoid valve.

Glide Setting of temperature glide on refrigeration systems using a zeotrope refrigerant.

Sequential defrost This involves regulation of several sections. When there is defrost, the whole appliance need not be defrosted at one go, it may be done section by section.

Output to compressor relay The output can be connected to the compressor's control circuit. The function may be used in con-nection with the thermostat function's on/off regulation, e.g. on plant with one evaporator and one compressor. Here the function may be used for starting and stopping the compressor.

Condensing pressure control The output signal can be connected to the con-denser’s control circuit. The signal is used for optimising the condensing pressure. The values for pressure increases and decreases are set via the control panel.

External alarm signal The input can be connected to a contact function. When the contact cuts out, the alarm function will be activated.

External reference signal The thermostat function’s reference can be displaced by means of an external voltage signal (0 - 10V d.c.). Or the input may be used for an alarm function, where alarm is given at high or low signal.

Light control A relay output will follow day/night operation.

ON/OFF input With an external signal it is possible to start a defrost cycle or to change between day and night opera-tion.

With a signal to this input the controller will for example activate the light in the cold room. An attached alarm function will sound the alarm if the door has been open for a longer period than permitted.

ON/OFF input from door switch


Technical data

*) In the "F-series" is the signal 24 V.

Type

AKC 114_ AKC 115_ AKC 116_ AKC 121_

Supply voltage 230 V +10/-15%, 50/60 Hz + + + +

Power consumption 10 VA 11 VA 12 VA 5 VA

Sensor inputs

Pt 1000 ohm /0°C 5 stk. 9 stk. 13 stk. 6 stk.

Temperature range -100 - +150°C -100 - +150°C -100 - +150°C -100 - +150°C

Low current input for night setback signal 1 1 1

Signal input for pressure transmitter type AKS 32R

(serie "A" only)1 1 1

External reference signal 0 to 10 V (serie "A" only) 1 1 1

ON/OFF indgange

Kontaktfunktion

Start/stop refrigeration 2

Defrost start or Day-/night switch 1

External alarm signal

(serie "A" only)1 1 1

230 V a.c.Start/stop refrigeration *) 1 1 1

Defrost start 1 1 1

ON-OFF udgange

(230 V)

SemiconductorAKV valve 1 2 3

Fan I max = 3,6 A

elay:

AC-1: 6 A (ohmic)

AC-15: 3 A (induc-tive)

Compressor 1

Alarm 1 1

Defrost 1 2

Rail heat 1

Gas defrost (114-116)

Condenser (serie "D")

Day-/night operation (serie "A")

1

Solenoid valve 2

Railheat / Day-/night opertion / Fan

1

Operation Control panel type AKA 21 / PC

Data communicationHardware RS 485

Software DANBUSS

Environment

0 - +55°C, during operation

-50 - +70°C, during transport

20 - 80% Rh, not condensed

No shock influence / vibrations

Enclosure

Material Eloxered aluminium (endedæksler i plast)

Density IP 30(32)

Weight 1,5 kg 2 kg 2 kg 1,5 kg

Montage Til indbygning på væg/DIN-skinne

Approvals

EU Low voltage Directive and EMC demands re CE-marking com-plied with.LVD-tested acc. to EN 60730-1 and EN 60730-2-9EMC-tested acc. to EN50081-1, EN 50082-1 and EN61000-6-2


Dimensions

AKC 114, 121: 359 mmAKC 115 / 116: 539 mm


Ordering

Typ

eA

KC

11

4A

KC

11

5A

KC

11

6A

KC

11

4DA

KC

11

5DA

KC

11

6DA

KC

11

4AA

KC

11

5AA

KC

11

6A

AK

C

114F

AK

C

115F

AK

C

116F

AK

C

121A

AK

C

121B

Lang

uage

/

Cod

e no

.

Engl

ish,

Ger

man

, Fre

nch

084B

-60

2708

4B-

6042

084B

-60

4308

4B-

6029

084B

-60

4408

4B-

6045

084B

-61

7108

4B-

6173

084B

-61

7508

4B-

6178

084B

-61

7908

4B-

6180

Engl

ish,

Dan

ish,

Sp

anis

h08

4B-

6028

084B

-60

4608

4B-

6047

084B

-60

3208

4B-

6048

084B

-60

4908

4B-

6172

084B

-61

7408

4B-

6176

Engl

ish,

Ger

man

, Fre

nch,

Dan

ish,

Sp

an-

ish,

Sw

edis

h

084B

-20

5108

4B-

2904

Inje

ctio

n

AKV

val

ve1

23

12

31

23

12

3

Evap

orat

ing

tem

per

atur

e m

easu

re-

men

t with

S1

12

31

23

12

3

Evap

orat

ing

pre

ssur

e m

easu

rem

ent

with

AKS

32R

x

MO

P fu

nctio

nx

xx

x

TEV

func

tion

xx

x

Glid

e ad

just

men

tx

xN

ot re

quire

dx

Ther

mos

tat

Num

ber

of t

herm

osta

ts1

23

12

31

23

12

32

2

Num

ber

of t

emp

erat

ure

sele

ctio

ns1

11

23

12

2

On/

off th

erm

osta

t or m

odul

atin

g th

erm

osta

tx

xx

xx

x

Exte

rnal

refe

renc

e si

gnal

1

Sole

noid

val

ve o

utp

ut2

2

Def

rost

Elec

tric

def

rost

xx

xx

xx

Gas

def

rost

x

Def

rost

bas

ed o

n re

quire

men

tx

xx

Sequ

entia

l def

rost

of s

ectio

nsx

x

Sund

ry

Out

put

for c

omp

ress

or re

lay

xx

xx

Con

dens

er p

ress

ure

cont

rol

x

Exte

rnal

ala

rm s

igna

lx

Ligh

t con

trol

xx

Ligh

t con

trol

or d

efro

stx

Rail

heat

or f

an o

r lig

ht c

ontr

olx

On/

off in

put

22

On/

off in

put

from

doo

r sw

itch

x2


Pressure transmitter type AKS 32R for AKC 114A - AKC 116A

Accessories

Pressure range Output signal Supply Accuracy Enclosure Pressure connection Code no.

-1 to 12 barFor max 5

controllersFrom controller 1% FS

Supplied without plug. IP67 can be obtained with the connecting plug mentioned here

1/4 in. flare 7/16 - 20 UNF 060G1036

1/4 - 18 NPT 060G1037

G 3/8 A ISO 228/1 060G1038

Connecting plug with 5 m cable IP 67 060G1034

Function Code no.

Bracket for DIN-rail (10 pcs.) 084B6160

Display type AKA 14 (with 3 m cable) 084B6040

Display type AKA 15 084B6130

3 m cable for AKA 15 (24 pcs.) 084B6145

AKC 114A - 116A and AKC 114F - 116F are also manufactured in an IP 00 enclosure for installation in a cabinet.

IP 00

Type Standard enclosure IP 00 enclosure Software Code no.

AKC 114A084B6171 084B6971 084B6171 084B6905 (8 pcs.)

084B6172 084B6972 084B6172 084B6902 (8 pcs.)

AKC 115A084B6173 084B6973 084B6173 084B6906 (6 pcs.)

084B6174 084B6974 084B6174 084B6903 (6 pcs.)

AKC 116A084B6175 084B6975 084B6175 084B6907 (6 pcs.)

084B6176 084B6976 084B6176 084B6904 (6 pcs.)

AKC 114F 084B6178 084B6978 084B6178 084B6908 (8 pcs.)

AKC 115F 084B6179 084B6979 084B6179 084B6909 (6 pcs.)

AKC 116F 084B6180 084B6980 084B6180 084B6910 (6 pcs.)

The pressure transmitter specifications are described in main catalogue RK.0Y.G.

AKA 14

AKA 15


Literature

AKC 114-116 Function description (AKC 114 - 116, AKC 114D - 116D, AKC 114A - 116A) ................................. RC1HU Function description (AKC 114F - 116F) .................................................................................................... RC1MF Menu operation via AKA 21 (AKC 114 - 116) ............................................................................................. RC1HV Menu operation via AKM (AKC 114 - 116) .................................................................................................. RC1HX Menu operation via AKA 21 (AKC 114D - 116D) ...................................................................................... RC1HZ Menu operation via AKM (AKC 114D - 116D) ........................................................................................... RC1H10 Menu operation via AKA 21 (AKC 114A - 116A) ....................................................................................... RC1MB Menu operation via AKM (AKC 114A - 116A) ............................................................................................ RC1MC Menu operation via AKA 21 (AKC 114F - 116F) ........................................................................................ RC1ME Menu operation via AKM (AKC 114F - 116F) ............................................................................................. RC1MG

AKC 121 Function description ............................................................................................................................... RC1MD Menu operation via AKA 21 (AKC 121A) ..................................................................................................... RC1MA Menu operation via AKA 21 (AKC 121B) .................................................................................................... RC1MJ

Common Installation guide for data communication cable ................................................................................... RC0XA Technical brochure Electronic expansion valve type AKV 10 ...................................................... RD8AB Main catalogue Solenoid valves and pressure transmitters type AKS 32R ...................... RK0YG Main catalogue Temperature sensors type AKS ........................................................................ RK0YG

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed.All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved. RC

-ET

Controller for controlling evaporators AKC 114 -...

Documents

Transcript of Controller for controlling evaporators AKC 114 -...