Thermo King SLXi Spectrum, Maintenance Manual

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Refrigeration Maintenance 10-4
NOTE: Repeat the pump down procedure if the pressures equalise above 1.40 bar, 20 psi. If suitably low pressures cannot be
achieved after the third pump down, the refrigerant must be recovered to perform service on the low side.
If the reading on the gauge manifold’s high pressure gauge increases after the high and low side pressures have been
equalised, the condenser inlet check valve is leaking.
h.Remember to reconnect the purge valve solenoid wires (DE, TCI and SPECTRUM models) and hot gas bypass valve
solenoid wires (Spectrum unit models) to the main wire harness when the service procedures have been completed.
Compressor Oil Acid Test
Perform an oil acid test whenever a unit has a substantial refrigerant loss, a noisy compressor or dark/dirty oil.
CHECKING COMPRESSOR OIL
NOTE: Use the Service Test mode to operate units with a TG-VI, µP-IV, µP-V, µP-VI or SR-2 controller. See the appropriate
Controller Operation and Diagnosis manual for instructions.
The compressor oil should be checked when there is evidence of oil loss (oil leaks) or when components in the refrigeration
system have been removed for service or replacement.
To check compressor oil level:
Operate the unit (and all remote evaporators) through a complete heat cycle and raise the box temperature to 15C. At 15C, operate
the unit on COOLING for ten minutes. Observe the oil level. The oil should be 1/4 to 1/2 up in the sight glass.
If the evaporator temperature is above 0 C, it will be necessary to force defrost. To force defrost, use a jumper wire and jump the
12 wire at the defrost relay to ground. Then push the manual defrost switch. Allow evaporator temperature to rise to
approximately 7 C. Remove the jumper wire from the defrost relay.
If the trailer is empty, you can operate the unit on the heat cycle instead of the defrost cycle.
NOTE: Use refrigeration compressor oil ONLY. Special polyol ester oil, TK P/N 203-413 is required on R-404A and R-452A
systems.
To add or remove compressor oil:
1. Pump down the compressor and equalise pressure 0 psi g (0 Bar g).
2. Attach an access valve actuator on the compressor oil pump, oil filter or oil filter return line fitting.
3. Remove or add correct type of compressor oil.
4. Remove the access valve actuator.
5. Evacuate the compressor before opening the service valves.
Checking Compressor Oil – X426 and X430
Compressors
1. Compressor Oil Sight Glass
2. Add and Remove Compressor through Fitting on
Compressor Oil Pump