16 AC unit ser6.pdf

7/25/2019 16 AC unit ser6.pdf

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Basis



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Expansion valve

Components L566 - L580 2plus2

AC Dryer/filter unit Pressure switch Condenser

Temperature sensors

Compressor Evaporator



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Condenser

Pressure switch

Evaporator

Expansion valve

Temperature

sensor

Compressor

Low pressure

High pressure AC dryer/filter unit

Filling:

Refrigerant R 134AL550 – L556 780g (+50g)

Id.Nr.10359187

L566 – L580 1250g (+50g)

Id. Nr.10359178(Sight glass or Scale)

Air-conditioning Circuit

Slide 3 L 544 - L 580 2plus2 Air-conditioning


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Gaseous state

Fluid state

Evaporation curve R134a

P bar

Refrigerant R134 A

Chemical Name Tetra fluorine

Chemical Composition CF3 – CH2FBoiling point - 26,3°C

Solidification point - 101°C

Concentration 1, 21




Boiling Point Curve for Water




Temperature/Pressure diagram


T e m p e r a tu r e / P re s s u re d ia g r a m A C u n it

1 , 3 5 1 , 5 01 , 7 5

2 , 3 0

0 , 0 0

5 , 0 0

1 0 , 0 0

1 5 , 0 0

2 0 , 0 0

2 5 , 0 0

1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5

A m b ie n t t e m p e r a t u r e ( °C )

P r e s

s u r e ( b a r )

0 , 0 0

2 , 0 0

4 , 0 0

6 , 0 0

8 , 0 0

1 0 , 0 0

1 2 , 0 0

1 4 , 0 0

1 6 , 0 0

T e m p

e r a t u r e ( ° C )

H ig h p re s u u re L o w p re s s u re T e m p e ra tu re V e n t ( fa c e r ig h t)



To increase the life of the shaft seal, the ACsystem should be switched on at least once

every 2 weeks.

1 Suction port

2 Pressure port

3 Filler plug AC compressor-oil

PAG SP 20 (8460275) 200 cm³

4 Magnetic coupling

5 Cam wheel6 Piston

Air-conditioning Compressor

SD 5 old 5 pistons

SDh 7 new 7 pistons




The expansion valve is mounted on

the evaporator, and measures the

out-put temperature, which in turn

regulates of flow through of the

expansion valve.

Temperature probe

membrane

Liquid filled Chamber

Low pressure Port

H i g h p r e s s u r e p

o r t

Ball valve

Pressure chamber

Expansion Valve




Pre filter (strainer)

AC unit L550 - L586 2plus2

Fresh air filter



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Circulation filter



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Fresh air filter

Servo motor -

Head area / DefrostM

Expansion valve

Servo motor-

Middle area

M

Servo motor -

Feet area

M





Servo motor, fresh-/circ. air

Control unit AC

Blower

Evaporator AC

Heat exchanger Heating

Expansion valve

Servo motor, water valve

Servo motors, air distribution

Fresh air filter




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Defrosting door window

Defrosting wind screen

Defrosting side window

Vents feet area

Driver vents

Middle area

Slide 14

Vents head area


i l




Controller AC-unit

Plug connection A21 X1 29-pin

loader side + sun sensor/ambient temp.

Plug connection A21 X2 pin AC-unit side + Cab temperature sensor




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Temperature Sensor Resistance value:

bei 20°C 12493Ω

15°C 15713Ω

10°C 19901Ω

5°C 25390Ω

2,5°C 29015Ω1,7°C 30174Ω

0°C 32639Ω

-5°C 42292Ω

0

3

6

9

12

15

18

21

24

27

30

33

36

39 42

45

25°C 20°C 15°C 10°C 5°C 0°C - 5°C

Temperatur

W i d e r s

t a n d s w e r t e

( K - O

h m )


Temperature Sensor

AC it L550 L586 2 l 2




Control unit

AC/Heating

A21

Power supply

Kl. 30 / Ground

Inputs:

Kl. 15

Auxilliary heating

Values pressure switch

Output:

Compressor clutch

CAN

RS232

AUTO:

External Sensors:

Ambient Temp.

(mirror)Sun Sensor (cab)

S e r v o

m o t o r s

B

l o w e r

I n t e r n a l s e n s o r

A u t o :

C a b

i n s i d e t e m p .

29 pin

loader- side

42 pin

AC- side


AC it L550 L586 2 l 2




The following possibilities can be chosen:

1. Heating Manual setting

2. Ventilation Manual setting

3. AC-unit Manual setting

The green marked buttons contain memory function

That means: after switch off and on again They are

in the same condition again.

With the “AUTO“ – button,

the whole system can be switched off and –on!


AC it L550 L586 2 l 2




Defrost mode

The defrost mode is pre-programmed

and looks like following:

until


AC it L550 L586 2 l 2




The following possibilities can be chosen:

Heating - AUTO-MODE

Ventilation - AUTO-MODE

AC - AUTO-MODE


AC unit L550 L586 2plus2




Heating - AUTO-MODE

Heating AUTO-MODE –

following settings can be done: AC-unit OFF or ON

•Temperature + / -

•Circulation on / off

At any change on the red marked buttons, the

MANUAL mode will be activated.

The heating - AUTO-MODE is only activated when theadjusted temperature > Ambient temperature.

T = 16°C – 28°C

bis






Ventilation - AUTO-MODE

Ventilation - AUTO-MODE –

following settings can be done:

AC-unit: OFF


•Circulation air ON / OFF

At any change of the red marked buttons, the

MANUAL mode will be activated.

The ventilation - AUTO-MODE is only activated, when theadjusted temperature ambient temperature.

bis






AC-unit - AUTO-MODE

AC-unit - AUTO-MODE –

following settings can be done:

AC-unit ON


•Circulation air ON / OFF

At any change on the red marked buttons, the

MANUAL mode is activated.

The AC-unit - AUTO-MODE is only activated, when theadjusted temperature < ambient temperature.

bis


Troubleshooting on the A/C System



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Troubleshooting on the A/C System

Not enough

refrigerant

Too much

refrigerantAir in

systemExpansion valve

blocked

Condenser

blocked

Compressorvalves

damaged

Presser too

high

Pressure too

low

Suctionpressure too

low

Noisycompressor

Liquid in

compressor

Bubbles insight glass

Not enough

cooling

Fault




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Tools




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End

16 AC unit ser6.pdf

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