Refrigeration Service Operations 11-22
MULTI-TEMPERATURE SYSTEM COMPONENTS
NOTE: The following components are unique to multi-temperature systems, including:
• TCI and SPECTRUM Host Units
• TLE and SPECTRUM Remote Evaporators
Discharge Pressure Sensor
Removal
1. Recover the refrigerant charge.
2. Disconnect the wire connector.
3. Remove the mounting clamp from the sensor.
4. Hold the discharge tube adapter with a backup wrench. Unscrew the sensor from the adapter.
Installation
1. Apply a refrigerant loctite to the threads of sensor.
2. Hold the discharge tube adapter with a backup wrench. Screw the sensor into the adapter.
3. Install mounting clamp on sensor. Connect wire connector.
4. Pressurise the refrigeration system and test for leaks.
5. If no leaks are found, evacuate the system.
6. Charge the unit with the correct refrigerant. Operate the unit and check the compressor oil level.
Liquid Line Solenoid Valve (LLS, LLS2, LLS3, RLLS or CLLS) or Suction Line Solenoid
Valve (SLS, SLS2, SLS3, RSLS or CSLS)
NOTE: Valves that have nylon seats must be disassembled before soldering.
Removal
1. Pump down the low side and equalise the pressure to 0 psig, (0 bar g).
2. Remove evaporator access panels.
3. Remove the coil and disassemble the valve.
4. Unsolder the liquid lines from the valve. Remove the valve from the unit.
CAUTION: Use a heat sink to prevent damaging the valve.
Installation
1. Clean the tubes for soldering.
2. Remove the coil and disassemble the valve. Place the valve in position in the unit.
3. Solder the inlet and outlet connections. After the valve cools, assemble the valve and install the coil.
CAUTION: Use a heat sink to prevent damaging the valve.
4. Replace Drier
5. Pressurise the refrigeration system and test for leaks.
6. If no leaks are found, evacuate the system.
7. Install evaporator access panels.
8. Open the receiver tank outlet valve. Place the unit in operation.
9. Check refrigerant charge.
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