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7-Temperature Thermistor
RT46/47/50/51 (ID) - RT48/49/52/53 OD
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C-Blower Compartment
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1-Blower Wheels
2-Indoor Blower Motor B3
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OPERATION / ADJUSTMENT
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Supply Air Staged Units
and Units Equipped With Optional Voltage or Phase
Detection --
start.
A-Blower Operation
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1 -
2 -
IMPORTANT
Three Phase Scroll Compressor Voltage
Phasing
Three phase scroll compressors must be phased
sequentially to ensure correct compressor and
blower* rotation and operation. Compressor and
blower are wired in phase at the factory. Power
wires are color-coded as
follows: line 1-red, line 2-yellow, line 3-blue.
1-Observe suction and discharge pressures and
blower* rotation on unit start-up.
2-Suction pressure must drop, discharge pressure
must rise and blower* rotation must match rotation
blower* rotation is not correct:
3-Disconnect all remote electrical power supplies.
to the line side of S48 disconnect or TB13 terminal
strip. Do not reverse wires at blower contactor.
5-Make sure the connections are tight. Discharge
and suction pressures should operate at their
normal start-up ranges.
*Supply air inverter blower motors should rotate
in the correct direction; verify scroll compressor
rotation separately. Contact technical support if the
blower is rotating incorrectly.
WARNING
1-Make sure that unit is installed in accordance with
the installation instructions and applicable codes.
factoryinstalled, for loose connections. Tighten as
required.
3-Check to ensure that refrigerant lines do not rub
against the cabinet or against other refrigerant lines.
4-Check voltage at disconnect switch. Voltage
must be within range listed on nameplate. If not,
consult power company and have voltage condition
corrected before starting unit.
up.
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