Refrigeration Service Operations (Rev 1/99)
68
Check Valve Replacement
Removal
1. Remove the refrigerant charge.
2. Disconnect the refrigeration line connections.
3. Remove the mounting hardware and remove the check
valve.
Installation
1. Place the check valve in position and install the mount-
ing hardware.
2. Connect the refrigeration lines.
3. Pressurize the refrigeration system and test for leaks.
4. If no leaks are found, evacuate the system.
5. Recharge the unit with refrigerant and check compres-
sor oil.
EVAPORATOR COIL
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Remove the evaporator panel. Disconnect the evapora-
tor fan motor wires.
3. Disconnect the expansion valve from the distributor.
4. Disconnect the hot gas line from the distributor.
5. Remove the defrost termination switch wire.
6. Unsolder the suction line from the evaporator coil.
7. Remove the mounting bolts and slide the coil from the
unit.
Installation
1. Place the coil in the housing.
2. Install the mounting bolts and tighten them.
3. Clean the tubes for soldering.
4. Solder the suction line to the evaporator coil.
5. Connect the hot gas line to the distributor.
6. Connect the expansion valve to the distributor.
7. Connect the defrost termination switch wire.
8. Install the expansion valve on the mounting bracket.
9. Pressurize the system and test for leaks. If no leaks are
found, evacuate the system.
10. Connect the evaporator fan motor wires. Install the
evaporator panel.
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