Refrigeration Service Operations
99
Hot Gas Solenoid Valve (HGS)
NOTE: Valves that have nylon seats must be
disassembled before soldering.
Removal
1. Pump down the low side and equalize the
pressure in the high side to slightly positive.
2. Remove the evaporator access panels.
3. Remove the coil and disassemble the valve.
4. Unsolder the hot gas lines from the valve, and
remove the valve from the unit.
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.
4. Pressurize the refrigeration system and test for
leaks.
5. If no leaks are found, evacuate the system.
6. Install the evaporator access panels.
7. Open the refrigeration valves and run the unit.
Check the refrigerant charge and compressor
oil.
Suction Line Solenoid Valve
(SLS)
NOTE: Valves that have nylon seats must be
disassembled before soldering.
Removal
1. Pump down the low side and equalize the
pressure in the high side to slightly positive.
2. Remove the evaporator access panels.
3. Remove the coil and disassemble the valve.
4. Unsolder the suction lines from the valve, and
remove the valve from the unit.
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.
4. Pressurize the refrigeration system and test for
leaks.
5. If no leaks are found, evacuate the system.
6. Install the evaporator access panels.
7. Open the refrigeration valves and run the unit.
Check the refrigerant charge and compressor
oil.
CAUTION: Use a heat sink to prevent
damage.
CAUTION: Use a heat sink to prevent
damage.
CAUTION: Use a heat sink to prevent
damage.
CAUTION: Use a heat sink to prevent
damage.
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