Bosch B22CS50SNW-01 General Repair - Instruction page 20

2.12.2.4 Repairs to the R 600A refrigerant circuit
Draining the refrigerant
The refrigerant circuit must be punctured on both sides in order to
bypass blockages on the pressure side.
The free gas component of the excess pressure (at room temperature
for KTR1570-Öko, with a total filling amount of 22 g, this is approx.
4–5 g, as approx. 4 g remain in the refrigerant circuit and approx. 14 g
in the compressor oil) then blows off. The remaining refrigerant filling
amount remains dissolved in the oil.
Replacing components
Disconnect the dryer and if required the compressor from the
refrigerant circuit with a pipe cutter.
If the compressor is removed, its connections must be
hermetically sealed immediately with Lokring blank
plugs to prevent the R 600A dissolved in the
compressor oil from evaporating and flowing out of the
connectors during transportation.
Filling amount calibration
If the balance is not operated for 2 minutes, it switches
off automatically.
The filling amount of the cartridge cannot be taken for
granted as refrigerant may escape via the valve during
the storage period.
Working steps: Example:
173_58300000002379_ara_en_j.doc – 29.04.14
►
Check weighing accuracy with standard weight and, if
required, re-adjust the balance.
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Weigh extraction valve (subtract) – 65.4 g
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Empty weight of the refrigerant cartridge, e.g. 29.5 g (subtract)
– 29.5 g
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Screw extraction valve onto the refrigerant cartridge.
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Weigh refrigerant cartridge with screwed-on extraction valve
and add the weight (this takes into consideration the
refrigerant lost when extraction valve screwed on and during
storage). +150.2 g
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Result: Nett filling amount of the refrigerant cartridge 55.3 g
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Determine excess refrigerant amount (drainage amount)
with compressor change:
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Nett filling amount of the refrigerant cartridge
Subtract appliance filling amount (rating plate)
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Result: Drainage amount, with compressor change
With a compressor change, 32.3 g R 600A are to be drained
from the cartridge.
without compressor change:
The refrigerant R 600A dissolves very easily in the compressor oil and
cannot be completely removed even during the 10-minute evacuation.
If the compressor is not replaced, the filling amount must be reduced
by 1 g, i.e. the drainage amount must be increased by 1 g.
►
Drainage amount, with compressor change
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Filling amount difference, 1 g (add)
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Result: Drainage amount, without compressor change
►
Without a compressor change, 33.3 g R 600A are to be
drained from the cartridge.
►
Drain the refrigerant
55.3 g
– 23.0 g
32.3 g
32.3 g
+ 1.0 g
33.3 g
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