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VII. REPAIRING DEVICES WHICH ARE EXCLUSIVE - USE FOR HFC-134a REFRIGERANT
1.
a.
b.
2.
Important Notice:
1.
2.
When pipe cleaning is so need:
When pipe cleaning is required:
3.
Never use blowing agent containing chlorine.
CFC-12, CFC-113, HCFC-22, HCFC-141b, R-502
4.
Be sure to use dryer which is exclusive - use HFC-134a.
Otherwise refrigerant HFC-134a will chemically decompose.
5.
VIII. REPAIRING STANDARD OF REFRIGERATING UNIT HFC-134a
1. O Must be done
∆
Need to done if Compressor Oil dirty and Quality no good (color changed)
2.
This refrigerator use Compressor with Ester Oil. Ester Oil employed as new compressor oil for
refrigerant HFC-134a.
From the time just after pipe cleaning is completed until the process of setting compressor
and dryer (just before vacuum pumping process).
Use repairing devices which are exclusive-use for HFC-134a refrigerating unit.
Do not keep the pipe open to air more than 30 minutes. Rubber caps of compressor parts should be
removed just before installation. It should be finished within 30 minutes.
From the process of removing compressor until the process of setting compressor and dryer
(just before vacuum pumping process).
Ester Oil is characteristic of higher hygroscopicity. When moisture leaks into the refrigerating unit,
it will chemically react with the moisture and solid substance clogging the pipe will form.
It is also characteristic of less stability when chlorine is contain. Ester oil will chemically react with
refrigerants containing chlorine and solid substance clogging the piping will form.
Since refrigerant HFC-134a has higher degree of swelling to the resin, charge hose and packing should
be made from good materials. Therefor when HFC-134a refrigerating unit, repairing method and
repairing devices axcept for vacuum pump are different from conventional method and devices. This is
to avoid mixture of different refrigerants and mixture of different oil.
Never re-use the pipes (example: charge pipe) which were once used for repairing CFC-
12 refrigerant unit.
PART MUST BE CHANGE
PIPA
DRYER
COMPRESSOR
C
O
M
P
R
E
S
S
O
R
F
A
U
L
T
CAUSE
Compressor broken
Compressor stop
Motor winding broken
Noise up normal
Motor burning
O
O
O
∆∆∆∆
O
O
O
∆∆∆∆
O
O
∆∆∆∆
O
O
O
O
O
∆∆∆∆
O
O
Clogged by solid
material
Inside of Inlet Eva.
Inside of Outlet Dryer
O
∆∆∆∆
O
∆∆∆∆
If gas charge fault cause solid material form, so compressor oil can not back flow to compressor.
Clogged by liquid material
Gas Leakage*
Gas Charge fault ( example : CFC-12 )
CAN NOT REPAIRING
O
O
O
O
-6-
Содержание NR-B203G-S7
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