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TM5-4120-387-14
Condenser fan loose on shaft.
(See para 4-53.)
l Too much oil in refrigerant system.
(See para 5-21.)
(2) Discharge pressure too low.
Possible causes:
Cold outside air.
(See para 2-7.)
l Low refrigerant charge.
(See para 5-7.)
l Compressor not operating.
(See para 5-21.)
l Problem with equalizing solenoid valve (L2). (See para 5-18.)
Problem with pressure regulating valve.(See para 5-25.)
l Internal compressor damage. (See para 5-21.)
(3) Suction pressure too low.
Possible causes:
l Dirty return air filter.
(See para 4-25.)
l Discharge or return air louvers closed.
l Dirty evaporator coil.
(See para 4-61.)
l Low refrigerant charge.
(See para 5-11.)
(Adjust louvers.)
Liquid solenoid valve (Ll) closed.
(See para 5-18.)
Fan motor not operating.
(See para 4-60.)
Evaporator fan loose on motor shaft.
(See para 4-58.)
Problem with expansion valve operation.
(See para 5-23.)
Expansion valve superheat too high.
(See para 5-23.)
Plugged or kinked distributor tube.
(See para 5-23.)
Suction line or evaporator coil tubing restriction. (See paras 5-24
and 5-29.)
Clogged dehydrator (filter-drier).
(See para 5-13.)
Moisture in refrigerant system.
(See para 5-7, step u.)
5-23
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