Evacuating air conditioning system, leak test

AR83.30-T-1762C

Evacuating air conditioning system, leak test

25.9.00

7.12.04

Activate electromagnetic shutoff valve, added

Step 1

Commercially available tools used, exchanged

Step 2

Screw in shutoff valves 2 to 5 turns, added

Step 3

Leak test structured

Steps 5, 6, 7, 8

Evacuating

 Danger!

Risk of explosion from welding or soldering work on closed air conditioning system. Risk of poisoning from inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with liquid refrigerant.

Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been discharged.

AS83.00-Z-0001-01A



Behavior if air conditioning system is damaged or leaking

All models

AH83.30-N-0004-01A



Notes on handling refrigerant R134a

Air conditioning with refrigerant R134a

AH83.30-N-0003-01A

1

Activate electromagnetic shutoff valve

If present

 Depending on the model and the version, the electromagnetic shutoff valve has to be activated in order to be able to fully evacuate the entire system.

Usually, the electromagnetic shutoff valve is located between the fluid reservoir and the expansion valve.

Models 613.355/455/485/358/388/364/365
with Konvekta air conditioning with roof heater and timer code HA4,
models 671.015/020/021/030/042 with Konvekta air conditioning with roof heater and timer code HA4 with front air conditioning code HO4,
models 613.355/455/485/358/388 with Webasto air conditioning with roof heater code HC1

Models 613.358/388 with Konvekta ACX 640 air conditioning with roof heater code HKD,

Model 613.367 with Konvekta ACX 623 air conditioning with roof heater code HKG

AR83.30-T-5470BAC



Cable for activation of solenoid

WF58.50-T-8330-01A

2

Connect suction and pressure line of the air conditioning vacuum and recycling unit to the suction-side testing and filling valve (2) and the pressure-side testing and filling valve (1)

 Observe the operator's manual of the air conditioning vacuum and recycling unit.



*WE58.40-Z-1002-22A

3

Screw in pressure-side shutoff valve (3) and suction-side shutoff valve (4) approx. 2 to 5 turns

 The pressure-side shutoff valve (3) and the suction-side shutoff valve (4) are located below the protective caps.

4

Evacuate air conditioning system



 Evacuate air conditioning system circuit until maximum possible vacuum has been reached, but for no less than 1 hour.

 When humidity has penetrated into the air conditioning circuit, evacuate for at least 8 hours.

Leak test

5

Switch off air conditioning vacuum and recycling unit

 Close valves of air conditioning vacuum and recycling unit.

Closing the valve prevents an incorrect leak test of the air conditioning vacuum and recycling unit.

6

Read off vacuum indication on pressure gauge of air conditioning vacuum and recycling unit

 Note vacuum pressure value

7

Read off vacuum indication on pressure gauge again after a waiting time of 10 minutes

 Compare current vacuum value to the recorded vacuum value.

If a drop in vacuum is detectable:



Fill air conditioning without performing leak test

 After filling the air conditioning system, check for leaky areas: 

AR83.30-T-1777C

Inspect the refrigeration circuit for leaks.

 Before repairing leaky area empty air conditioning system:



AR83.30-T-1209-01C

Discharge air conditioning system

 Check for leaky areas again after the repair work:



AR83.30-T-1780C

Repeat steps 1 to 7.

8

Fill air conditioning system

 Do not evacuate nor perform leak test.

AR83.30-T-1777C

WE58.40-Z-1002-22A

Air conditioning service station