Thermo King 098916, Maintenance Manual

Page: 143 / 196

Refrigeration Maintenance
142
Compressor Replacement
Compressor Removal
Remove the compressor by performing the
following steps:
1. Remove the compressor compartment bracket.
2. Isolate the compressor from the system.
a. Front seat the discharge service valve by
turning the valve fully clockwise.
b. Front seat the suction service valve by
turning the valve fully clockwise.
c. Turn the digital service valve one quarter
turn to the right.
See “Isolate the Compressor” on page 130. for
additional information.
3. Recover the refrigerant charge from the
compressor. (see “Recovering Refrigerant
from the System” on page 137).
4. Remove discharge service valve, suction
service valve, digital control valve line and
vapor injection valve line from the
compressor.
5. Remove compressor discharge temperature
sensor from the discharge valve manifold.
6. Disconnect the unit from the three-phase
power supply.
7. Remove the three-phase electric power
connection from the compressor.
8. Remove the compressor mounting tray bolts
and nuts.
9. Slide the compressor from the unit.
10. Keep compressor ports covered to prevent
dust, dirt, etc., from falling into compressor.
Compressor Installation
Install the compressor by performing the
following steps:
1. Slide the compressor into the unit. Install
mounting bolts, washers and nuts, and tighten.
2. Bolt the discharge and suction service valves
to the compressor. Use a new gasket coated
with compressor oil on the discharge valve.
3. Connect vapor injection line and digital
control valve line to compressor body.
4. Apply refrigerant locktite to the threads of the
compressor discharge temperature sensor.
Install the switches.
5. Pressurize the refrigeration system and check
for leaks (see “Refrigerant Leak Test
Procedure” in this chapter).
6. If no leaks are found, recover the refrigerant
used for the leak test (see “Leak Test
Procedures” in this chapter).
7. Evacuate the system (see “Evacuation and
Cleanup of the Refrigeration System” in this
chapter).
8. Connect three-phase electric power to the
compressor.
9. Recharge the unit with R-404A (see
“Charging the System with Refrigerant” in
this chapter).
10. Perform a controller pretrip test to verify
system operation.
1. Scroll Compressor
2. Suction Service Valve
3. Discharge Service Valve
Figure 90: Scroll Compressor
1
3
2