Sharp DW-71-H, Service Manual, Page: 26 / 40

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DW-71-H
HFC-134a CYCLE REPAIR PROCEDURE
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.
Additional valve
Vacuum pump To low pressure pipe
To high pressure pipe
Gauge manifold
Charging cylinder
For HFC-134a
For HFC-134a
Coolant cylinder
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)
For dehumidifier
only
Equipment name
Gauge manifold
Charging hose ass'y
Charging cylinder
3-way reducer (for charging cylinder)
Check valve (prevention of back flow of oil of vacuum pump)
Vacuum pump
Reducer (for vacuum pump)
Coupler (2 pcs.)
Nitrogen blow pressure regulator
Nitrogen blow kit
Leak detector
Tool box for dehumidifier
Common use
For R-12
For HFC-134a
(for refrigerator)
: Applicable
: Not applicable
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.
No.
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