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Hfc-134A Cycle Repair Procedure - Sharp DW-71-H Service Manual

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DW-71-H
Refrigerator cycle repair
As the service tools for the coolant gas CFC-12 (R-12) cannot be
used for HFC-134a, the specific tools must be used.
"FOR HFC-134a" must be indicated.
The connections of service tools are different.
CFC-12: 1/4 in
HFC-134a: 3/8 in
(HFC-134a for dehumidifier: 10 mm screw is used)
Caution
When servicing, use only the couplers, vacuum pumps,
pressure gauge hoses, valves, and charging cylinders specified
for HFC-134a.
Clean the new parts with ethyl alcohol, or use oilproof
parts.
When replacing the compressor, use the new Dryer filter for
HFC-134a.
Evacuation must be performed within 15 minutes after unpacking.
Gas leak
If gas leak occurred, be sure to replace the compressor and Dryer filter as a pair.
If gas leak occurred, replace the leaking part irrespective of whether it is at low pressure side or high pressure
side.
Use the service parts of Dryer filter set for HFC-134a (CDRY-A001FBK0) (with two evacuation pipes).
1. List of service tools for dehumidifier (specific use and common use)
No.
Gauge manifold
1
2
Charging hose ass'y
3
Charging cylinder
4
3-way reducer (for charging cylinder)
5
Check valve (prevention of back flow of oil of vacuum pump)
6
Vacuum pump
7
Reducer (for vacuum pump)
8
Coupler (2 pcs.)
9
Nitrogen blow pressure regulator
10
Nitrogen blow kit
11
Leak detector
12
Tool box for dehumidifier
As shown above,
•Vacuum pump:
indicates a set of necessary tools. Here, use the tools of R-12 type.
(If any R-12 type is not available, be sure to attach the check valve when using the tools of
HFC-134a type which is applicable for refrigerator.)
•Nitrogen blow kit: Not required for dehumidifier
•Charging cylinder: Use the tools of HFC-134 type which is applicable for refrigerator.
•Leak detector: Use the tools of HFC-134 type which is applicable for refrigerator.

HFC-134a CYCLE REPAIR PROCEDURE

Equipment name
Additional valve
Vacuum pump
To low pressure pipe
Coolant cylinder
For dehumidifier
only
26
Gauge manifold
For HFC-134a
To high pressure pipe
Charging cylinder
For HFC-134a
Common use
For HFC-134a
For R-12
(for refrigerator)
: Applicable
: Not applicable

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