Note! If You have not got enough training for repairing
refrigerating systems, it is necessary to call an expert if
the system should be opened or if refrigerant must be
added. The refrigerating system expert has equipment
with which repair work can be done in a correct and safe
way.
Drier
The drier reservoir (3) is a combined expansion/liquid
reservoir and a drying filter for moisture. The drier
also includes a filter which filt er s impurities in the
system. There are two inspection glasses on the
drier: A=inspection of refrigerant and its filling,
B=moisture indicator.
The drier reservoir must not be sto red with pipe con-
nections open. The drier must be changed if the
system has been opened for maintenance work.
There is a pressure switch S19 which switches off
current to compressor, if the high pressure rises too
much or is too low. There is also an in---built heat
fuse which melts if refrigerant temperature rises up to
107---118˚C (not heat fuse if refrigerant R134a).
1144
Model Code Page
83. Air conditioner
1. 1. 1994
6000--8750 831 2
15. 6. 1992
Possible faults can be localized easily if pressur e gauges are
connected to the compressor service valves. The low pres-
sure gauge is connected to valve S and the high pressure
gauge to valve D. For instruction on how to car ry out these
pressure measurements, see page 831/5.
.
Inspection glass A (1500 r/min and max cooling effect)
Sightglass
Description Conclusion and remark s
No bubbles appear at all.
(Reduction by bleeding is necessary).
(This can also mean that there is no ref ri-
gerant at all in the system).
POSSIBLE EXCESSIVE REFRIGERANT
The high---pressure side will be abnormally hot.
REMEDY: Contact authorized workshop for releasing the excess refrigerant
The fluid inside is almost transparent. A
few bubbles may appear as the engine
speeds up and down.
SUFFICIENT REFRIGERANT.
The high---pressure side will be hot and the low---pressure side cold.
A few bubbles appear intermittenly, at
intervals of 1 to 2 seconds.
(Refilling is necessary)
INSUFFICIENT REFRIGERANT.
The high---pressure side will be warm, and the low---pressure side fairly cold.
REMEDY: Check for refrigerant leakage. Contact authorized workshop.
When bubbles flow continuously, or the
flow has changed to a ”mist” flow, the
refrigerantisalmostexhausted.
(Refilling is necessary)
VERY LIT TLE REFRIGERANT.
There will be almost no difference in temperature between the high---pressure
side and the low---pressure side.
REMEDY: Stop the compressor and inspect the entire system. When neces-
sary , contact authorized workshop.
N.B. The refrigerant in the inspect ion glass should be clear. If it has brown/yellowish colour, the refrigerant and the drier must be
changed.
Inspection glass B
If the moisture indicator colouris blue, the system is in order. If itscolour has changed into pink or grey, the drier and therefrigerant
should be changed.
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