Thermo King T-1080S, Maintenance Manual

Page: 149 / 191

Refrigeration Service Procedures
148
7. Continue to turn the piston and piston nut onto
the stepper motor until they are tight. Torque
the piston nut and stepper motor to 37 ft-lb (50
N•m).
Installation of Complete ETV
Assembly
1. Clean the tubes for soldering.
2. Place the new complete ETV assembly (and
any tubes that were removed) in the same
position from which the old one was removed
and install the ETV mounting hardware. The
ETV assembly must be installed as shown
below relative to the direction of refrigerant
flow from the accumulator to the compressor.
NOTE: Do not disassemble the new ETV to
solder it in place.
3. Use a heat sink or wrap the valve body with a
wet rag to prevent damage and solder the
tubing connections with 95-5 soft solder.
4. Connect the ETV harness to the main wire
harness at the four-pin connector.
5. Pressurize the low side and test 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 ETV is properly
installed.
Evaporator Coil Replacement
Removal
1. Recover the refrigerant charge.
2. Remove the evaporator top panel.
3. Unsolder the hot gas line and the line to the
expansion valve from the distributor.
4. Unsolder the suction line from the evaporator
coil.
5. Remove the mounting bolts and slide the coil
from the evaporator housing.
Installation
1. Place the evaporator coil in the housing.
2. Install and tighten the mounting bolts.
3. Clean the tubes for soldering.
4. Solder the suction line to the evaporator coil.
5. Solder the hot gas line and the line from the
expansion valve to the distributor.
6. Pressurize the system and check for leaks.
7. If no leaks are found, replace the liquid line
drier then evacuate and dehydrate the system.
8. Install the evaporator top panel.
9. Recharge the unit with refrigerant and check
the compressor oil.
Expansion Valve Replacement
Removal
1. Pump down the low side and equalize the
pressure to slightly positive. Make sure to
front seat the suction service valve to isolate
the low side and use the suction access port to
access the low side.
2. Remove the feeler bulb from the suction line
clamp. Note the position of the feeler bulb on
the suction line.
3. Unsolder the equalizer line from the
expansion valve.
4. Unsolder the inlet liquid line and the line to
the distributor from the expansion valve.
1. Use Heat Sink
2. Direction of Refrigerant Flow
Figure 238: Installing Complete ETV Assembly
(Old Style Shown, New Style Similar)
1
2