50VL-C, 50VL-F: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30
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.
Puron (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 Puron (R-410A) systems. R-22
pressure switches must not be used as replacements for the Puron
(R-410A) air conditioner.
Low Pressure Switch (24 and 30 size only)
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 (Puron (R-410A) Refrigerant)
The compressor used in this product is specifically designed to operate
with Puron (R-410A) 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 Puron (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 Puron (R-410A). If you are unsure, consult the
equipment manufacturer. Failure to use Puron (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
refrigerants. Take all necessary precautions to avoid exposure of the oil
to the atmosphere.
Rotary Compressor
The 24 and 30 size units use a single cylinder rotary compressor. This
compressor utilizes a rotor which is positioned eccentrically with respect
to the shell. Refrigerant gas is ported directly into the compression
chamber and discharged into the surrounding area. It is also known as a
“high-side” design since high pressure gas surrounds the motor and
compression chamber. The majority of the shell will be hot to the touch.
The rotary compressor also utilizes an external built-in accumulator to
reduce the likelihood of refrigerant liquid from entering the compressor.
WARNING
!
EXPLOSION, SAFETY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal injury, death or
equipment damage.
This system uses Puron (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 Puron (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 Puron (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 Puron (R-410A). If you are unsure,
consult the equipment manufacturer.
