COMPRESSORS
The scroll compressor used in this product is specifically de-
signed to operate with R-410A Refrigerant and cannot be inter-
changed.
CAUTION: This system uses R-410A Refrigerant which oper-
ates at higher pressures than R-22. No other refrig-
erant may be used in this system.
The compressor also uses a polyolester (POE oil) Mobil 3MA
POE. This oil is extremely hygroscopic, meaning it absorbs wa-
ter readily. POE oil can absorb 15 times as much water as other
oils designed for HCFC and CFC refrigerants. Take all neces-
sary precautions to avoid exposure of the oil to the atmos-
phere.
CAUTION: Do not leave the system open to the atmosphere.
Unit damage could occur due to moisture being ab-
sorbed by the POE oil in the system. This type of
oil is highly susceptible to moisture absorption.
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.
CAUTION: Exposure, even if immediately cleaned up, may
cause embrittlement (leading to cracking) to occur
in one year or more. When performing any service
that may risk exposure of compressor oil to the
roof, take precautions to protect roofing.
Procedures which risk oil leakage include, but are not limited
to, compressor replacement, repairing refrigerant leaks, re-
placing refrigerant components such as filter drier, pressure
switch, metering device or coil.
Units are shipped with compressor mounting which are
factory-adjusted and ready for operation.
CAUTION: Do not loosen compressor mounting bolts.
PHASING
Three-phase, scroll compressors operate in only one direction.
If the scroll is drawing low amperage, has similar suction and
discharge pressures, or is producing a high noise level, the
scroll is misphased. Change the incoming line connection
phasing to obtain the proper rotation.
CAUTION: Scroll compressors require proper rotation to oper-
ate properly. Failure to check and correct rotation
may result in property damage.
4
Unitary Products Group
035-20188-000-A-0704
R
G
W
R
C
Y
Y
W 2
C
W 1
O
O
G
24 VOLT TRANSFORMER
UNIT TERMINAL STRIP
THERMOSTAT
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can
cause improper and dangerous operation. Verify proper operation after servicing.
** = Minimum wire size of 18 AWG
wire should be used for all field
installed 24 volt wire.
**
* = Only required on units with
supplemental electric heat.
*
CONTROL WIRING
NOTE:
HEAT ANTICIPATOR
SHOULD BE SET AT 0.25
AMPS FOR ALL MODELS.
PROGRAMMABLE
THERMOSTAT ONLY
POWER WIRING
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
OVERCURRENT PROTECTION.
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
FIG. 2 - TYPICAL FIELD WIRING DIAGRAM