Advertisement
PY5G--B: Installation Instructions
A
Size
24
30
36
42
48
60
If no refrigerant leaks are found and low cooling performance is
suspected, refer to the Checking and Adjusting Refrigerant Charge
section.
Gas Input
The gas input does not require checking unless improper heating
performance is suspected. If a problem exists, refer to the Start-Up
section.
Evaporator Airflow
The heating and/or cooling airflow 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 the Indoor Airflow
and Airflow Adjustments section to check the system airflow.
R-454B 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 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-454B systems. R-22 pressure
switches must not be used as replacements for the R-454B system.
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.
High pressure may be caused by a dirty outdoor coil, failed fan motor, or
outdoor air recirculation. To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have continuity
on a closed switch.
Compressor ( Refrigerant)
The compressor used in this product is specifically designed to operate
with R-454B 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
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
MOTOR
Max Distance Between Top of Fan Grille and Bottom of Fan Blade
Fig. 28 – Fan Blade Position
FAN GRILLE
MOTOR SHAFT
"A"
IN.
9.0
8.0
7.6
7.6
7.6
7.6
off, if possible, for most troubleshooting techniques. Refrigerants
present additional safety hazards.
!
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.
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 (26.34 kPa) and 625 psig (29.93 kPa) differential pressure.
!
EXPLOSION, ENVIRONMENTAL SAFETY HAZARD
Failure to follow this warning could result in personal injury, death or
equipment damage.
This system uses
R-454B 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-454B. If you are unsure, consult the equipment
manufacturer.
Refrigerant System
This information covers the refrigerant system including the compressor
oil needed, servicing systems on roofs containing synthetic materials, the
filter drier and refrigerant charging.
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
41
mm
228
203
193
193
193
193
WARNING
WARNING
A08505
Advertisement
