Installation
18 RT-SVX055D-EN
during compressor starts. Oil foaming occurs when
refrigerant condenses in the compressor and mixes with
the oil. In lower ambient conditions, refrigerant migration
to the compressor could increase.
When the compressor starts, the su
dden redu
ction in
crankcase pressure causes the liquid refrigerant to boil
rapidly causing the oil to foam. This condition could
damage compressor bearings due to reduced lubrication
and could cause compressor mechanical failures.
Before starting the unit in the “Cooling” mode, set the
system
switch to the “Off” position and turn the main
power disconnect to the “On” position and allow the
crankcase heater to operate a minimum of 8 hours.
Before closing the main power disc
onnect switch, insure
that the “System”
selection switch is in the “Off” position
and the “Fan” selection switch is in the “Auto” position.
Close the main power disconnect switch and the
unit
mou
nted disconnect switch, if applicable.
Checklist
Use the following checklist in conjunction with the general
checklist (“General Unit Requirements,” p. 14) to ensure
that the unit is properly installed and ready for operation.
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.
• Check all electrical connections for
tightness and
“point of term
ination” accuracy.
• Verify that the condenser airflow is unobstructed.
• V
erify that the condenser fan and ind
oor blower turn
freely without rubbing and are properly tightened on
the shafts.
• Check the supply fan belts for proper tension and the
fan b
earings for suffi
cient lubrication. If the belts
require adjustment, or if the bearings need lubricating,
refer to the maintenance section of this manual for
instructions.
• Verify that a condensate trap i
s in
stalled and the piping
is properly sized and pitched.
• Verify that the correct size and number of fi
lters are in
place.
• Inspect the interior of the unit for tools and debris and
i
nstall all
panels in preparation for starting the unit.
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