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• Verify that the Remote panel “System” selection switch,
“Fan” selection switch, and “Zone Temperature”
settings for automatic operation are correct.
• Inspect the unit for misplaced tools, hardware, and
debris.
• Verify that all exterior panels including the control panel
doors and condenser grilles are secured in place.
• Close the main disconnect switch or circuit protector
switch that provides the supply power to the unit’s
terminal block or the unit mounted disconnect switch.
WARNING
Safety Alert!
Failure to follow instructions below could result in
death or serious injury.
In addition to the following tasks, you MUST:
• Follow all instructions in the unit’s Installation,
Operation, and Maintenance manual, including
warnings, cautions, and notices.
• Perform all required tasks in any applicable
Service Alerts and Service Bulletins.
• Review and understand all information provided
in Submittals and Design Specifications.
Preparing the Unit for Operation
Be sure to complete all of the procedures described in this
section before starting the unit for the first time.
Use the checklist provided below in conjunction with the
“Installation Checklist” to ensure that the unit is properly
installed and ready for operation.
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.
• Check all electrical connections for tightness and “point
of termination” accuracy.
• Verify that the condenser airflow will be unobstructed.
• Check the compressor crankcase oil level. Oil should
be visible in the compressor oil sight glass. The oil level
may be above the sight glass prior to the initial start.
Use appropriate lighting (flashlight) to verify the
presence of oil.
• Prior to unit startup allow the crankcase heater to
operate a minimum of 8 hours to remove liquid
refrigerant from the compressor sump.
• Optional Service Valves - Verify that the discharge
service valve and suction service valve fully open on
each circuit.
• Check the supply fan belts for proper tension and the
fan bearings for sufficient lubrication. If the belts require
adjustment, or if the bearings need lubricating, refer to
the Maintenance section of this manual for instructions.
• Inspect the interior of the unit for tools and debris and
install all panels in preparation for starting the unit.
Electrical Phasing
Unlike traditional reciprocating compressors, scroll
compressors are phase sensitive. Proper phasing of the
electrical supply to the unit is critical for proper operation
and reliability.
The compressor motor is internally connected for clockwise
rotation with the incoming power supply phased as A, B, C.
Proper electrical supply phasing can be quickly determined
and corrected before starting the unit by using an
instrument such as an Ideal - Sperry 61-520 Phase
Sequence Indicator and following the steps below:
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.
• Open the disconnect switch or circuit protector switch
that provides the supply power to the unit's power
terminal block or to the unit mounted disconnect switch.
• To be consistent with the compressor leads, connect
the phase sequence indicator leads to the terminal
block or unit mounted disconnect switch as follows;
Table 13. Phase sequence leads
Phase Sequence Leads
Unit Power Terminal
Brown (phase A)
L1
Orange (phase B)
L2
Yellow (Phase C)
L3
• Turn the “System” selection switch to the “Off” position
and the “Fan” selection switch (if Applicable) to the
“Auto” position.
• Close the disconnect switch or circuit protector switch
that provides the supply power to the unit's power
terminal block or unit mounted disconnect switch.
Startup
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