Refrigeration Service Operations 11-23
Condenser Inlet Solenoid Valve (CIS) or Hot Gas Solenoid Valve (HGS, HGS2, HGS3,
RHGS, HGBP or CHGS)
NOTE: Valves that have nylon seats must be disassembled before soldering.
Removal
1. Recover the refrigerant charge.
2. Remove the coil and disassemble the valve.
3. Unsolder the hot gas lines form the valve, and 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, disassemble the valve, and place the valve in position.
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. Charge the unit with the correct refrigerant. Operate the unit and check the compressor oil level.
Suction Line Check Valve (SLCV, SLCV2, SLCV3, RSLCV or CSLCV), Purge Check Valve
(PCV) or Liquid Return Check Valve (LRCV, LRCV2, LRCV3, RLRCV or CLRCV)
Disassembly and Inspection
1. Pump down the low side and equalise the pressure to 0 psig, (0 bar g).
2. Remove the bonnet nut (or cap) from the check valve.
NOTE: An in-line check valve
(see Parts Catalogue for P/N) does not have a bonnet nut and is not repairable. An in-line check
valve must be replaced if it fails. Place a heat sink on the valve before unsoldering the inlet and outlet connections to prevent
damage to the neoprene seal.
3. Inspect the seat in the check valve for damage or foreign particles which might adhere to the seat and would damage the new
seat. If damaged, replace the entire check valve assembly.
Replacement
1. If the seat in the check valve is damaged, unsolder the inlet and outlet line connections. Remove the check valve.
2. Clean the tubes for soldering.
3. Place a new disassembled check valve in position. Arrow on the valve body indicates the direction of refrigerant flow through
the valve.
NOTE: Place a heat sink on an in-line check valve
(see Parts Catalogue for P/N) before soldering the inlet and outlet connections to prevent damage to the neoprene seal. Then go
to step 3 under Repair/Assembly.
4. Solder the inlet and outlet connections. After the valve cools, reassemble the valve.
Repair/Assembly
1. Install the new seat and spring.
2. Place the new gasket on the cap and torque to 61 N•m.
3. Replace Drier.
4. Pressurise the low side and test for leaks.
5. If no leaks are found, evacuate the system.
6. Open the receiver tank outlet valve. Place the unit in operation.
7. Check refrigerant charge and the compressor oil level.
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