Signature Kitchen Suite UPSXB2627S, Руководство по обслуживанию

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TROUBLE DIAGNOSIS
1-4. Practical Work For Heavy Repair
Items Precautions
1. Removal of residual
refrigerant.
1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.
2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate
recovery equipment to recover the refrigerant from the system. When the refrigerant has
been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT TO
OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.
The use of piercing type valves will allow future servicing and eliminates the possibility of a
defective pinch off.
KEY POINT
Observe the sequence for
removal of refrigerant.
(If not, compressor oil may
leak.)
2. Nitrogen blowing
welding.
When replacing a drier:
Weld
①
and
②
parts by blowing nitrogen (0.1~0.2kg/cm 2 ) to high pressure side after
assembling a drier.
When replacing a compressor:
Weld
①
and
②
parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because it does not produce
oxidized scales inside pipe because of its short welding time.
KEY POINT
Welding without nitrogen
blowing produces
oxidized scales inside a
pipe, which affect the
performance and
reliability.
3. Replacement of drier.
Inserting a capillary tube
Measure distance with a ruler and put a mark (12 +3/-0)on the capillary tube. Insert tube to
the mark and weld it.
KEY POINT
Be sure to check the
inserted length of capillary
tube when it is inserted.
(If inserted too far, the
capillary tube will be
blocked by the filter.)
* Unit : mm
Filter
Compressor
Low pressure side
Condenser
Drier
Hot Line
Evaporator
Evaporator
Drain Pipe
3 way valve
High pressure side
Compressor
Low pressure side
Condenser
Drier
Hot Line
Evaporator
Evaporator
Drain Pipe
3 way valve
High pressure side