Thermo King 002008, Manual

Page: 92 / 155

Refrigeration Service Operations
92
Receiver Tank
Removal
1. Recover the refrigerant charge.
2. Unsolder the refrigeration lines from the
receiver tank.
3. Unbolt the mounting brackets and remove the
receiver tank from the unit.
4. Remove the high pressure relief valve from
the receiver tank. It will be installed on the
new receiver tank.
Installation
1. Install the high pressure relief valve on the
new receiver tank. Make sure to use a new
O-ring and coated with refrigerant oil.
2. Place the receiver tank in the unit and install
the mounting bolts and nuts loosely. Position
the receiver tank so that the sight glass is
clearly visible.
3. Solder the refrigeration lines to the receiver
tank.
4. Tighten the receiver tank mounting hardware
securely.
5. Pressurize the refrigeration system and check
for leaks. If no leaks are found, evacuate the
system.
6. Recharge the unit with proper refrigerant.
Filter Drier
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Disconnect the ORS nuts at the ends of the
drier.
3. Loosen the mounting hardware and remove
the drier.
Installation
1. Place the new O-rings in the ORS fittings on
the ends of the drier.
2. Install the new drier and tighten the mounting
screws and nuts.
3. Install and tighten the inlet ORS nut. Hold the
drier with a back-up wrench on the hex behind
the ORS fitting.
4. Release a small amount of refrigerant to purge
the air through the drier. Then tighten the
outlet ORS nut.
5. Pressurize the system and inspect for leaks. If
no leaks are found, open the refrigeration
valves and place the unit in operation.
Expansion Valve Assembly
NOTE: This procedure applies to the
Zone 1/Host unit expansion valve.
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the evaporator access panels.
3. Remove the feeler bulb from the clamp. Note
the position of the feeler bulb on the suction
line.
4. Disconnect the equalizer line from the suction
line.
5. Disconnect the inlet liquid line and unsolder
the distributor from the expansion valve.
6. Remove the expansion valve mounting bolt
and remove the expansion valve from the unit.
Installation
1. Install and bolt the expansion valve assembly
in the unit.
2. Connect the inlet liquid line and solder the
distributor to the expansion valve.
3. Connect the equalizer line to the suction line.
4. Clean the suction line to a bright 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
operation will be faulty. Wrap with insulating
tape.