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©2019 Tecumseh Compressor Company LLC. All rights reserved. TPC Part #71511 | Rev A 05/13/2019www.tecumseh.com
Operational Checkout Procedure
• Check if the voltage deviation is within the specified range.
• Check that the ampere draw doesn’t exceed the amperage specified on the nameplate.
• Check the phase unbalance if there is a three-phase connection. Unbalanced voltage should not exceed 2%.
• Check proper phase connections on three phase models only.
• Check that the discharge and suction pressures are within the allowable design limits.
• Check the liquid flow in the liquid sight glass.
• Check the compressor sight glass (if equipped) for proper oil level. The ideal oil level is 1/2 way up the
sight glass, however, oil levels between 1/4 and 3/4 of the sight glass are acceptable.
• Measure compressor and evaporator superheats. Make proper adjustments if necessary.
• Check the high-pressure control setting by simulating a condenser block, shutting off the fans and
observing with extreme caution the pressure rise.
• Check the low-pressure setting by simulating a pump-down cycle. Observe the cut-off pressure, and adjust
accordingly.
• Check (if equipped) the defrost and timer controls for proper initiation and termination settings.
• If any malfunction is observed at any time during either start-up or operational checkout procedures,
stop the unit, disconnect power and correct the malfunction accordingly.
• Re-check after 48 hours of operation for loose electrical connections, abnormal vibrations that may have
developed, refrigerant charge and correct any probable malfunction observed.
• Always re-assemble the enclosure panels when operational check out procedure is completed.
Never leave loose or not properly tightened panels.
FIELD WIRING
WARNING:
All wiring must be done in accordance with applicable codes and local ordinances.
The field wiring should enter the areas provided on the unit. The wiring diagram for each unit is located on the
inside of the electrical panel door. All field wiring should be done in a professional manner and in accordance
with all governing codes. Before operating unit, double check all wiring connections, including the factory
terminals. Factory connections can vibrate loose during shipment.
1. Consult the wiring diagram in the unit cooler and in the condensing unit for proper connections.
2. Wire type should be of copper conductor only and of the proper size to handle the connected load.
3. The unit must be grounded.
4. For multiple evaporator systems, the defrost termination controls should be wired in series.
Follow the wiring diagrams for multiple evaporator systems carefully. This will assure complete defrost of all
evaporators in the system.
5. Multiple evaporator systems should operate from one thermostat.
6. If a remote defrost timer is to be used, the timer should be located outside the refrigerated space.
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