25
Component Testing
Compressor Description
Test Procedure
9.
Plug test cord into volt-watt meter to determine start and run wattage as
well as check for low voltage which can also be a
Source of trouble.
10. With power to voltmeter, press start cord switch and release.
•
If compressor motor start and draws normal wattage,
compressor is okay and trouble is in capacitor, relay /
overload, freezer temperature control , or elsewhere in
system.
•
If compressor does not start when direct wired, recover
system at high side. After system is recovered, repeat
compressor direct wire test. If compressor runs after
recovery, a restriction is indicated.
•
If compressor does not run when wired direct after recovery
replace faulty compressor.
Condenser Condenser is of tube and wire
Leaks in condenser can usually be determined by using an electronic
Construction located in
or soap solution. Look for signs of compressor oil when checking
Compressor compartment
for leaks. A certain amount of compressor oil is circulated with
refrigerant.
Condenser is on high pressure
Leaks in post condenser loop are rare because loop is a one-piece
discharge side of compressor
copper tube except for brazed joint visible in machine.
transfer heat absorbed by
refrigerant to ambient.
Higher pressure gas is routed
For Minute Leaks:
to condenser where, as gas
1. Separate condenser from rest of refrigeration system and
temperature is reduced, gas
pressurize condenser up to a maximum of 9.65 bars (140psi)
condenses into a high pressure
with a refrigerant and dry nitrogen combination.
liquid state. Heat transfer
2. Recheck for leaks.
takes place because discharge
gas is at a higher temperature
than air that is passing over
condenser. It is very
important that adequate air
flow over condenser is maintained.
Condenser is air cooled by
Condenser fan motor. If
efficiency of heat transfer
from condenser to surrounding
air is impaired, condensing
Remove any lint accumulation, etc. that would restrict normal air
temperature becomes higher.
Movement through condenser.
High
liquid
temperature
means
the liquid will not remove as
much heat during boiling in
evaporator as under normal head
pressure, long run time, and high
wattage.
From compressor refrigerant
Flows into serpentine under
Condensate pan to help
evaporate condensate, and then
into pre-condenser loop which
helps control exterior condensa-
tion on flange, center mullion,
and around freezer door.
