Refrigeration Service Operations
144
5. Solder the equalizer line to the suction line
and the liquid outlet line to the expansion
valve.
6. Tighten the heat exchanger mounting
hardware securely.
7. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
8. Clean the suction tube to a brightly polished
condition. Install the feeler bulb clamps and
the feeler bulb on the side of the suction line
in its former position. The feeler bulb must
make good contact with the suction line or the
operation will be faulty. Wrap with insulating
tape.
9. Replace the evaporator access panels.
10. Open the refrigeration valves and place the
unit in operation.
Evaporator Coil Assembly
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the evaporator access panels.
3. Disconnect the sensors and the defrost drain
hoses.
4. Unsolder the liquid line, hot gas line, and
suction line connections on the curbside of the
evaporator. Remove any putty from around
the lines on the curbside of the evaporator.
Remove any putty from around the lines
before unsoldering the connections.
5. Remove the mounting bolts, lift and slide the
evaporator coil assembly from the unit.
Installation
1. Place the evaporator coil assembly in position
and install the mounting bolts.
2. Solder the liquid line, hot gas line, and suction
line connections on the curbside of the
evaporator. Seal the openings through the
bulkhead with putty when the refrigerant lines
have cooled off.
3. Replace and reconnect connect the sensors,
and reconnect defrost drain hoses.
4. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
5. Replace the evaporator access panels.
6. Open the refrigeration valves and place the
unit in operation. Check the refrigerant charge
and the compressor oil. Add as required.
Accumulator
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Unsolder the inlet and outlet suction lines
from the accumulator.
3. Unbolt and remove the accumulator from the
unit.
Installation
1. Place the accumulator in the unit and tighten
the mounting bolts and nuts.
2. Solder the inlet and outlet suction lines to the
accumulator.
3. Pressurize the low side and test for refrigerant
leaks. If no leaks are found, evacuate the low
side.
4. Open the refrigeration valves and place the
unit in operation. Check the refrigerant charge
and the compressor oil. Add as required.
CAUTION: Use a heat sink or wrap ETV
with wet rags to prevent damaging the
ETV.
CAUTION: Use a heat sink or wrap ETV
with wet rags to prevent damaging the
ETV.
