Maytag JENN-AIR Owner's Manual download pdf (Page 28)

System Diagnosis

CONDITION

SUCTION

PRESSURE

VARIATION

FROM

NORMAL

HEAD

PRESSURE

VARIATION

FROM

NORMAL

T1 INLET

TEMPERATURE

VARIATION

FROM NORMAL

T2 OUTLET

TEMPERATURE

VARIATION

FROM NORMAL

T3 SUCTION

TEMPERATURE

VARIATION

FROM NORMAL

WATTAGE

VARIATION

FROM

NORMAL

Refrigerant

Overcharge

Increase Increase Warmer Warmer Colder Increase

Shortage of

Refrigerant

Decrease

Decrease or

Increase

See Text

Colder Warmer Warmer Decrease

Partial

Restriction

Decrease

Decrease or

Increase

See Text

Note 2

Colder Warmer Warmer Decrease

Air in System Near Normal Increase Warmer Warmer Warmer Increase

Low Ambient

Installations

(High

Ambients the

Reverse)

Decrease Decrease Colder Warmer Warmer Decrease

Additional

Heat Load

Increase Increase Warmer Warmer Warmer Increase

Inefficient

Compressor

Increase

Normal or

Decrease

Warmer or

Colder

Warmer Warmer Decrease

Symptoms of an Overcharge

• Above normal freezer temperatures.

• Longer than normal or continuous run.

• Freezing in refrigerator.

• Higher than normal suction and head pressure.

• Higher than normal wattage.

• Evaporator inlet and outlet temperatures warmer than

normal.

• Suction tube temperature below ambient. Always

check for separated heat exchanger when suction

temperature is colder than ambient.

Various conditons could indicate an overcharge. For

example, if the cooling coil is not defrosted at regular

intervals, due to a failure of the defrost system, the

refrigerant will "flood out" and cause the suction line to

frost or sweat. The cause of this problem should be

corrected rather than to purge refrigerant from the

sytem. Running the freezer section colder than

necessary (-2 to -1 F. is considered normal package

temperatures) or continuous running of the compressor

for a variety of reasons, or the freezer fan motor not

running, may give the indication of an overcharge.

Symptoms of Refrigeration Shortage

• Rise in food product temperature in both

compartments. (See Note 1 below.)

• Long or continuous run time.

• Look for obvious traces of oil that would occur due to a

leak or cracked refrigerant line.

• Lower than normal wattage.

• Compressor will be hot to touch because of the heat

generated by the motor windings from long continuous

running. It will not be as hot as it would be with a full

charge and long run times for some other reason such

as a dirty condenser.

• Depending on the amount of the shortage, the

condenser will not be hot, but closer to room

temperature. The capillary tube will be warmer than

normal from a slight shortage.

• If the leak is on the high side of the system, both

gauges will show lower than normal readings and will

show progressively lower readings as this charge

becomes less. The suction pressure guage will

probably indicate a vacuum.

• If the leak is on the low side of the system the suction

pressure guage will be lower than normal - probably in

a vacuum - and the head pressure gauge will be

higher than normal. It will probably continue to

become higher because air drawn in through the leak

is compressed by the compressor and accumulates in

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Maytag JENN-AIR Owner's Manual Page 28

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