Thermo King SB-210, Manual

Page: 114 / 159

Refrigeration Service Operations
114
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
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.
5. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
6. Replace the access panels.
7. Open the refrigeration valves and place the
unit in operation.
8. Test the unit to see that the expansion valve is
properly installed.
Heat Exchanger
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the upper and lower evaporator
access panels.
3. Remove the mounting bolts that hold the heat
exchanger on the bulkhead.
4. Disconnect the equalizer line from the suction
line.
5. Disconnect the liquid outlet line from the
expansion valve.
6. Note the position of the feeler bulb on the side
of the suction line. Remove the expansion
valve feeler bulb from the suction tube.
7. Unsolder the suction line at the evaporator coil
end.
1. End View
2. Side View
Figure 99: Location of Expansion Valve Bulb
AEA713