Siemens KG39EAI43 - Repairing refrigeration circuit (R134 a)

8.4 Repairing refrigeration circuit (R134a)
Notice
High operating pressure in refrigerant cycle!
Risk of injury caused by high pressure injection.
▶
Do not open refrigeration circuit while the appliance is switched
on.
Notice
Leaking refrigerant!
Cold burns of skin and eyes.
▶
Wear protective gloves.
▶
Wear protective goggles.
▶
Wear personal protective equipment.
Work on any open R134a refrigeration circuit should be completed
without delay. A synthetic ester oil is used in these refrigeration circuits.
One characteristic of this oil is that it binds with moisture in the atmo-
sphere very quickly. For this reason, where possible the refrigeration
circuit should not be left open for more than 30 min, as this will result
in severe enrichment with moisture, and therefore to a build-up of acid
in the oil.
1. Replace dryer and compressor.→Page 64
2. Dispose of compressor oil.→Page 61
3. Filling the filler cylinder→Page 65.
4. Evacuate refrigeration circuit.→Page 66
5. Fill refrigeration circuit.→Page 67
8.4.1 Replacing dryer and compressor
Required tools:
Pipe cutting pliers for copper, alu and steel pipes with
outside diameter of 4mm - 13mm
and wall thickness up to 1.5mm
[00341282]
Pipe insertion valve for pipe insertion [00340965]
Dryer can only retain a certain amount of moisture. It is not possible to identify the de-
gree of saturation of the dryer. Accordingly, to prevent any moisture penetrating the re-
frigeration circuit as a result of a saturated dryer, it must be replaced after every cooling
circuit repair.
When during repair it is required to open refrigeration circuit always re-
place the dryer before evacuating and filling the circuit.
In the case of any leakage at the intake side of the refrigeration circuit, it is essential for
the compressor to be replaced during the repair. As a result of the penetration of mois-
ture into the refrigeration circuit, irreparable damage is caused to the oil in the com-
pressor. In addition, deposits are created at the valves, and these result in compressor
failure in later operation.
Compressor must only be replaced if the refrigeration circuit is leaking
on the intake side.
Prerequisite:
Compressor electrical connections are disconnected.
1. Insert into refrigeration circuit on both sides using pipe insertion valve.
Free overpressure proportion of refrigerant gas of the is released.
2. Using pipe cutter disconnect dryer and if required compressor from the refrigera-
tion circuit.
Dryer is removed.
Compressor is removed.
3. Hermetically seal compressor connections using Lokring plug.
4. 1. Install service dryer.→Page 12
2. Install new compressor.
Repair
2020-08-03_58300000002379_ara_en_p Copyright by BSH Hausgeräte GmbH Page64of73