Overcharged Refrigerant Systems - Friedrich racservmn Service Manual

NOTE: Heat pump
refrigeration
drawing

Overcharged Refrigerant Systems

Compressor amps will be near normal or higher.
Noncondensables can also cause these symptoms. To
confirm, remove some of the charge, if conditions improve,
system may be overcharged. If conditions don't improve,
Noncondensables are indicated.
Whenever an overcharged system is indicated, always make
sure that the problem is not caused by air flow problems.
Improper air flow over the evaporator coil may indicate some
of the same symptoms as an overcharged system.
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An over charge can cause the compressor to fail, since it would
be "slugged" with liquid refrigerant.
The charge for any system is critical. When the compressor
is noisy, suspect an overcharge, when you are sure that the
air quantity over the evaporator coil is correct. Icing of the
evaporator will not be encountered because the refrigerant
will boil later if at all. Gauges connected to system will usually
have higher head pressure (depending upon amount of
overcharge). Suction pressure should be slightly higher.