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

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

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.