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5. Evacuate and charge system using recommended
procedure described under Evacuating and
Recharging.
Removing the Evaporator:
1. Disconnect power from the freezer, remove the
cold control and fan housing cover and release the
top of the evaporator cover.
2. Remove the defrost heater, termination thermostat
and the plastic straps holding evaporator to the
evaporator cover.
3. Remove the machine compartment cover.
4. Recover refrigerant by using EPA approved
recovery system.
Note:
Whenever this sealed system is opened,
the filter-drier must be replaced.
CAUTION: On R-134a systems, the system must
NOT be left open to the atmosphere
for more than 10 minutes to prevent
moisture contamination of compressor
oil.
5. Remove the filter-drier.
6. Cut the suction line at the compressor.
7. Straighten the tubing and carefully feed the heat
exchanger, up through the cabinet, while lifting up
on evaporator.
8. With the evaporator and heat exchanger removed
from the freezer, remove the heat exchanger from
the evaporator.
Replacing the Compressor:
CAUTION: NEVER install a new compressor without
first checking for possible system
contamination.
To check for contamination, obtain oil sample from old
compressor.
•
If the oil has burned odor, but no color change or
residue — install the new compressor
•
If oil has a burned odor and a sugar or gritty feel
as well as showing signs of contamination (dark
color) — Flush The System. Remove as much of
contamination as possible from system before
installing new compressor and filter-drier.
To Flush the System:
NOTE: It is recommended that system be flushed
with dry Nitrogen. However, if refrigerant
is used to flush the system you must look
at the serial plate to see what type of
refrigerant is used in the system. This is
the only refrigerant that can be used
to flush the system and it must be
recovered.
CAUTION: Use extreme care when using Dry
Nitrogen to flush systems. Pressure in
41
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