PA4G: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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After inspecting the electrical controls and wiring, replace the access
panels (see
). Start the unit, and observe at least one complete
heating cycle and one complete cooling cycle to ensure proper operation.
If discrepancies are observed in either or both operating cycles, or if a
suspected malfunction has occurred, check each electrical component
with the proper electrical instrumentation. Refer to the unit wiring label
when making these checkouts.
NOTE:
Refer to the heating and/or cooling sequence of operation in
this publication as an aid in determining proper control operation
Refrigerant Circuit
Inspect all refrigerant tubing connections.
If low cooling performance is suspected, leak-test all refrigerant tubing
using an electronic leak-detector or liquid-soap solution. If a refrigerant
leak is detected, refer to the Check for Refrigerant Leaks section.
If no refrigerant leaks are found and low cooling performance is
suspected, refer to the Checking and Adjusting Refrigerant Charge
section.
Evaporator Airflow
The heating and/or cooling air-flow does not require checking unless
improper performance is suspected. If a problem exists, be sure that all
supply- and return-air grilles are open and free from obstructions, and
that the air filter is clean. When necessary, refer to Indoor Airflow and
Airflow Adjustments section to check the system airflow.
R-410A Items
The indoor metering device is either a TXV or orifice type device
depending on size.
Pressure Switches
Pressure switches are protective devices wired into the control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure switches
are specifically designed to operate with R-410A systems. R-22 pressure
switches must not be used as replacements for the R-410A air
conditioner.
Low Pressure Switch (if used)
This switch is located on the suction line and protects against low
suction pressures caused by such events as loss of charge, low airflow
across indoor coil, dirty filters, etc. It opens at 50
psig (957 Pa). If
system pressure is above this, switch should be closed.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohmmeter leads across switch. You should have continuity
on a closed switch.
NOTE:
Because these switches are attached to refrigeration system
under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem exists.
If switch must be removed, remove and recover all system charge so that
pressure gauges read 0 psi (0 Pa). Never open system without breaking
vacuum with dry nitrogen.
High-Pressure Switch
The high-pressure switch is located in the discharge line and protects
against excessive condenser coil pressure. It opens at 650 psig (31.1
kPa). High pressure may be caused by a dirty condenser coil, failed fan
motor, or condenser air recirculation.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohmmeter leads across switch. You should have continuity
on a good switch.
Compressor (R-410A Refrigerant)
The compressor used in this product is specifically designed to operate
with refrigerant and cannot be interchanged.
The compressor is an electrical (as well as mechanical) device. Exercise
extreme caution when working near compressors. Power should be shut
off, if possible, for most troubleshooting techniques. Refrigerants
present additional safety hazards.
For models that have a scroll compressor, the compressor pumps
refrigerant throughout the system by the interaction of a stationary and
an orbiting scroll. The scroll compressor has no dynamic suction or
discharge valves, and it is more tolerant of stresses caused by debris,
liquid slugging, and flooded starts. The compressor is equipped with a
noise reducing shutdown device and an internal pressure relief port. The
pressure relief port is a safety device, designed to protect against
extreme high pressure. The relief port has an operating range between
550 (26.3 kPa) and 625 (29.9 kPa) psig differential pressure.
Refrigerant
This system uses R-410A refrigerant which has higher operating
pressures than R-22 and other refrigerants. No other refrigerant may be
used in this system. Gage set, hoses, and recovery system must be
designed to handle R-410A. If you are unsure, consult the equipment
manufacturer. Failure to use R-410A compatible servicing equipment or
replacement components may result in property damage or injury.
Compressor Oil
The Copeland scroll compressor uses 3MAF POE oil. If additional oil is
needed, use Uniqema RL32-3MAF. If this oil is not available, use
Copeland Ultra 32 CC or Mobil Arctic EAL22 CC. This oil is extremely
hygroscopic, meaning it absorbs water readily. POE oils can absorb 15
times as much water as other oils designed for HCFC and CFC
WARNING
!
EXPLOSION, SAFETY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal injury, death or
equipment damage.
This system uses R-410A refrigerant which has higher operating
pressures than R-22 and other refrigerants. No other refrigerant may be
used in this system. Gauge set, hoses, and recovery system must be
designed to handle R-410A. If you are unsure, consult the equipment
manufacturer.
WARNING
!
FIRE/EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death
and/or property damage.
Wear safety glasses and gloves when handling refrigerants. Keep
torches and other ignition sources away from refrigerants and oils.
WARNING
!
EXPLOSION, ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death or
equipment damage.
This system uses R-410A refrigerant which has higher operating
pressures than R-22 and other refrigerants. No other refrigerant may be
used in this system. Gauge set, hoses, and recovery system must be
designed to handle R-410A. If you are unsure, consult the equipment
manufacturer.
