548267-YIM-C-0211
Unitary Products Group
11
Compressors
The compressor used in this product is specifically designed to
operate with R-410A Refrigerant and cannot be interchanged.
The compressor also uses a polyolester (POE oil), Mobil 3MA
POE. This oil is extremely hydroscopic, meaning it absorbs
water readily. POE oil can absorb 15 times as much water as
other oils designed for HCFC and CFC refrigerants. Take all
necessary precautions to avoid exposure of the oil to the
atmosphere.
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.
Procedures which risk oil leakage include, but are not limited to,
compressor replacement, repairing refrigerant leaks, replacing
refrigerant components such as filter drier, pressure switch,
metering device or coil.
Units are shipped with compressor mountings which are
factory-adjusted and ready for operation.
Power And Control Wiring
Field wiring to the unit must conform to provisions of the current
N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or local ordinances.
The unit must be electrically grounded in accordance with local
codes or, in their absence, with the N.E.C./C.E.C. Voltage
tolerances which must be maintained at the compressor
terminals during starting and running conditions are indicated
on the unit Rating Plate and Table 5.
The wiring entering the cabinet must be provided with
mechanical strain relief.
A fused disconnect switch should be field provided for the unit.
If any of the wire supplied with the unit must be replaced,
replacement wire must be of the type shown on the wiring
diagram.
Electrical line must be sized properly to carry the load. Each
unit must be wired with a separate branch circuit fed directly
from the meter panel and properly fused.
Power Wiring
This heat pump is equipped to accept a single circuit of supply
power. If an auxiliary heater is installed, dual circuiting to the
unit can be used. When installing a 14.3 KW heater, this
method will avoid the use of large wiring. To provide single
circuiting, an optional jumper bar can be used to electrically
connect the circuit breakers provided with the heater kit.
If auxiliary electric heaters are not installed, refer to data sheet
for minimum circuit ampacity and maximum overcurrent protec-
tive device size. If auxiliary electric heaters are being installed,
refer to the installation instructions (included with heater pack-
ages) for electrical requirements and wiring information.
To wire this system without the use of auxiliary electric heat,
remove the control box access door.
1.
Remove side panel. Run power line service wiring into
control box through the bottom knockout opening in the
casing. (The two top knockouts are used when installing an
auxiliary heater.)
2.
For single phase units - Connect one supply wire to L1 on
the contactor, and the other supply wire to L2 on the
contactor. Connect ground wire to ground lug in control
box. See Figure 10.
3.
For three phase units - connect supply wires to L1, L2 and
L3 on the contactor. Connect ground wire to ground lug in
control box.
4.
Unless the heat pump is grounded through proper wiring to
the service entrance ground terminal, a suitable separate
ground must be provided at the air conditioner.
This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system.
Do not leave the system open to the atmosphere. Unit
damage could occur due to moisture being absorbed by
the
POE oil
in the system. This type of oil is highly
susceptible to moisture absorption
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.
Do not loosen compressor mounting bolts.
