Remote Evaporator Refrigeration Service Operations
178
Solenoid Valves
NOTE: Valves that have nylon seats must be
disassembled before soldering.
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the access panels.
3. Remove the coil and disassemble the valve.
4. Unsolder the refrigeration 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 vale 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 access panels.
7. Open the refrigeration valves and run the unit.
Check the refrigerant charge and compressor
oil. Add as required.
IMPORTANT: Truck Spectrum evaporators use
Suction Line Solenoids with bleed port, where
Trailer evaporators do not. Be careful not to
intermix the two solenoids.
Check Valve Replacement
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the access panels.
3. Unsolder lines and remove the check valve.
NOTE: Disassemble the valve before
unsoldering.
Installation
1. Clean the tubes for soldering.
2. Place the disassembled check valve in
position. The arrow on the valve body
indicates the direction of refrigeration flow
through valve.
3. Solder the inlet and outlet connections. After
the valve cools, reassemble it.
4. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
5. Install the access panels.
6. Open the refrigeration valves and place the
unit in operation. Check the refrigerant charge
and the compressor oil. Add as required.
CAUTION: Use a heat sink to prevent
damaging the valve
CAUTION: Use a heat sink to prevent
damaging the valve.
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