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Restricted Regrigerant System
Troubleshooting a restricted refrigerant system
more common problems and solutions to these
problems. There are two types of refrigerant
restrictions; partial restrictions and complete
restrictions.
•
A partial restriction allows some of the
refrigerant to circulate through the system.
•
With a complete restriction there is no
circulation of refrigerant in the system.
•
Restricted refrigerant systems display the
same symptoms as a "low-charge condition".
A quick check for either condition begins at
the evaporator. With a partial restriction, there
may be gurgling sounds at the metering device
entrance to the evaporator. The evaporator in a
partial restriction could be partially frosted of have
an ice ball close to the entrance of the metering
device. Frost may continue on the suction line
back to the compressor.
Often a partial restriction of any type can be
found by feel, as there is a temperature difference
from one side of the restriction to the other.
With a complete restriction, there will be no sound
at the metering device entrance. An amperage
check of the compressor with a partial restriction
may show normal current when compared to the
Manual.
With a complete restriction, the current drawn
may be considerable less than normal, as the
compressor is running in a deep vacuum (no
load). Much of the area of the condenser will
be relatively cool since most of all of the liquid
refrigerant will be stored there.
The following conditions are based primarily on a
system in the cooling mode.
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