Thermo King T-1080S, Maintenance Manual

Page: 150 / 191

Refrigeration Service Procedures
149
5. 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. Solder (95-5 Solder) the inlet liquid line and
the distributor to the expansion valve.
3. Solder (95-5 Solder) the equalizer line to the
expansion valve.
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 the
operation will be faulty. Wrap with insulating
tape.
5. Pressurize the low side and check for leaks.
6. If no leaks are found, replace the liquid line
drier then evacuate the low side.
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 Replacement
NOTE: It unlikely that the heat exchanger is
defective. Carefully review your refrigeration
system diagnosis to eliminate all other system
components before proceeding. This
replacement procedure should only be attempted
by qualified technicians.
Removal
1. Recover the refrigerant charge.
2. Remove the evaporator top panel.
3. Remove the mounting hardware that holds the
heat exchanger on the bulkhead.
4. Unsolder the equalizer line from the suction
line.
5. Unsolder the liquid line to 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.
8. Unsolder the remaining outlet suction line and
inlet liquid line connections from the
condenser side of the bulkhead. Remove putty
from around the lines before unsoldering the
connections.
9. Lift the heat exchanger assembly out of the
evaporator housing.
Installation
1. Clean the tubes for soldering.
2. Place the heat exchanger assembly in the
evaporator housing and install the mounting
hardware loosely.
3. Solder the liquid inlet and suction outlet line
connections on the condenser side of the
bulkhead. Seal openings through bulkhead
with putty when the refrigerant lines have
cooled off.
4. Tighten the heat exchanger mounting
hardware securely.
1. Suction Line
2. Capillary Bulb
3. End View
Figure 239: Location of Expansion Valve Bulb
1. Top View
Figure 240: Completely Wrap Bulb with Tape