75 PB
R-410A SEALED SYSTEM REPAIR
Overcharged Refrigerant Systems
Compressor amps will be near normal or higher. Noncondensables can also cause these symptoms. To conrm,
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 ow
problems. Improper air ow over the condenser coil may indicate some of the same symptoms as an over charged
system.
An overcharge 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 condenser 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 over charge). Suction pressure should be slightly higher.
Figure 506(Overcharged System)
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