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1. Position the compressor into the heat pump and align
the mounting holes. Apply anti-seize compound to the
four mounting bolts, washers, and nuts before
installation. Tighten nuts securely with 1/2–inch socket
and wrench.
2. Remove Schrader valve fittings from old compressor
and install them on new compressor with appropriate
thread sealant.
3. Install the rotalock nuts on the compressor suction and
discharge connections. Tighten with a spud wrench.
4. Charge compressor with 150 psi dry nitrogen and
conduct a bubble and electronic leak check.
5. Evacuate new compressor using the suction and
discharge Schrader valves. Monitor and ensure that at
least a 500 micron or lower vacuum is achieved (250 to
500 micron range would be ideal.)
6. Weigh in amount of refrigerant charge that was
removed.
7. Reconnect compressor electrical connections exactly
as they were removed, crankcase heater, and high
pressure switch.
8. Replace the electrical and control panel cover securely.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
9. Restore power to the module containing the
compressor by removing the lockout / tagout in the
power distribution panel.
10. Energize the new compressor allowing it to run as long
as possible.
ARTC-SVX006A-EN
11. Observe and document the operating pressures of the
newly installed compressor. It is advised that the
expansion valve superheat adjustment be checked.
Controller Tasks
Replace PLC Logic Controller
Prior to servicing the controller, verify that the power to the
heat pump is disconnected.
1. Remove all quick-connect black plugs and the one
orange plug (power supply 24 Vac).
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
2. The PLC logic controller is DIN rail-mounted. Once
plugs are removed, this will expose the gray secure
tabs on the bottom rear of the PLC.
3. Using a flathead screwdriver, insert screwdriver into the
slotted holes on the gray tabs and use downward force
to release PLC.
4. Remove the PLC by lifting the bottom out and then up,
off of the DIN rail.
5. Replace new controller in reverse fashion.
Note: On a multiple modular system with multiple PLC's, it
is imperative that the new PLC has the exact same
programming as the remaining PLC's or it will not be
compatible and would create havoc within the other
PLCs.
6. Energize power to the module by turning power ON at
the breaker and/or disconnect.
Maintenance Procedures
53
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