Evacuate air and charge proper amount of purified refrigerant after installing the parts in the

refrigerant line.

No

Gauge reading kg /cm2 (psi, kPa)

Condition

Probable cause

Remedy

Lp: 1.5-2.0 (21 - Z&, 147-195) HF; 14.5 - Î5.0 (206 - 213. 1,422 -1r47l>

Normal cooling

Normally functioning system

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pip

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During operation, pressure at low pressure side sometimes becomes a vacuum and sometimes normal

Periodically cools and then fails to cool

Moisture present in refrigeration system

(1) Replace receiver

(2) Remove moisture in system through repeatedly evacuating air

2

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Amm

• Always recover refrigerant before removing the parts in the refrigerant line and evacuating air.

• Evacuate air and charge proper amount of purified refrigerant after installing the parts in the refrigerant line.

Gauge reading kg/cm2 (psi, kPa)

Pressure low at both low and high pressure sides

Pressure too high at both low and high pressure sides

Condition

Insufficient cooling Bubbles seen in sight glass

Probable cause

Insufficient cooling Frost on tubes from re ceiver to unit

Insufficient cooling

Insufficient cooling Frost or Large amount of dew on piping at low pressure side

Insufficient refrigerant

Refrigerant flow obstructed by dirt in receiver

Remedy

(1) Check for gas leakage with gas leak tester and repair if necessary

(2) Add refrigerant until bubbles disappear

Replace receiver

Insufficient cooling of condenser

Refrigerant overcharged

Air present in system

(1) Clean condenser

(2) Check fan motor operation

(1) Check amount of refrigerant

If refrigerant is overcharged

(2) Recover refrigerant

(3) Evacuate air and charge proper amount of purified refrigerant

(1) Replace receiver

(2) Check compressor oil to see if dirty

(3) Remove air in system through repeatedly evacuating air

Expansion valve improperly mounted, heat sensing tube defective (Opens too wide)

(1) Check heat sensing tube installation condition

(2) Check expansion valve and replace if defective

HINT at 6:

These gauge indications are for when the refrigeration system has been opened and the refrigerant charged without evacuating air.

NOTICE:

• Always recover refrigerant before removing the parts in the refrigerant line and evacuating air.

• Evacuate air and charge proper amount of purified refrigerant after installing the parts in the refrigerant line.

Gauge reading kg /cm2 (psi, kPa)

Vacuum indicated at low pressure side, very low pressure indicated at high pressure

Condition

Does not cool (Cools from time to time in some cases) Frost or dew seen on piping before and afte receiver or expansion valve aCBIH

Pressure too high at low pressure side, pressure too low at high pressure side

Does not cool

Probable cause

Refrigerant does not circulate

Remedy

(1) Check heat sensing tube for gas leakage and replace expansion valve if defective

(2) Clean out dirt in expansion valve by blowing with air

If not able to remove dirt, replace expansion valve

(3) Replace receiver

Insufficient compression

Repair or replace compressor

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