Unit Start Up
94 RT-SVX36K-EN
• Turn the “System” selection switch (at the Remote
Panel) to the “Off” position and the “Fan” selection
switch (if Applicable) to the “Auto” or “Off” position.
• 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 should be 1/2 to 3/4 high in the sight glass with the
compressor “Off”.
• Verify that the compressor discharge service valve and
the liquid line service valve is back seated on each
circuit.
Do not start the unit in the cooling mode if the ambient
temperature is below the following minimum
recommended operating temperatures:
Standard unit with or without HGBP -
+55 F for 20 & 40Ton
+50 F for 25 & 30Ton
+45 F for 70 thru 130Ton
+35 F for 50 & 55Ton
+30 F for 60Ton
Units with Low Ambient option without HGBP - 0°F
Units with Low Ambient option with HGBP - +10°F
Note: To prevent compressor damage due to no
refrigerant flow, do not pump the system down
with the compressor(s) below 25 PSIG under any
circumstance.
• 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 Service/Maintenance section of this
manual for instructions.
• Inspect the interior of the unit for tools and debris.
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. Color paint dots on the terminal block
should match that of the associated wire attached to the
lug.
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 Associated Research Model 45
Phase Sequence Indicator and following the steps below:
• Turn the field supplied disconnect switch that provides
power to terminal block 1TB1 or to the unit mounted
disconnect switch 1S14 to the “Off” position.
• Connect the phase sequence indicator leads to the
terminal block or unit mounted disconnect switch as
follows;
• Close the disconnect switch or circuit protector switch
that provides the supply power to the unit's terminal
block 1TB1 or the unit mounted disconnect switch
1S14.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK
1TB1 OR UNIT DISCONNECT SWITCH 1S14.
• Observe theABC and CBA phase indicator lights on the
face of the sequencer.The ABC indicator light will glow
if the phase is ABC. If the CBA indicator light glows,
open the disconnect switch or circuit protection switch
and reverse any two power wires.
• Restore the main electrical power and recheck the
phasing. If the phasing is correct, open the disconnect
switch or circuit protection switch and remove the
phase sequence indicator.
NOTICE:
Compressor Damage!
Do not allow liquid refrigerant to enter the suction line.
Excessive liquid accumulation in the liquid lines may
result in compressor damage. Compressor service
valves must be fully opened before start-up (suction,
discharge, liquid line, and oil line).
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Table 41.
Phase sequence leads Unit power terminal
Black (Phase A) L1
Red (Phase B) L2
Yellow (Phase C) L3
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
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