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PH4G--B: Installation Instruction
Step 9 – Loss of Charge Switch
This switch is located on the liquid 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 on a pressure drop at about 20 psig.
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 ohm meter leads across switch. You should have continuity
on a good 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 psig. Never open system without breaking
vacuum with dry nitrogen.
Step 10 – 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 good switch.
Step 11 – Copeland Scroll Compressor (R-410A
Refrigerant)
The compressor used in this product is specifically designed to
operate with R-410A refrigerant and cannot be interchanged.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death or property damage.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition
sources away from refrigerant and oils.
The scroll 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 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 and 625 psig differential pressure.
Step 12 – Refrigerant System
This step covers the refrigerant system including the compressor oil
needed, servicing systems on roofs containing synthetic materials, the
filter drier and refrigerant charging.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Refrigerant
!
PROPERTY HAZARD, PERSONAL INJURY OR
ENVIRONMENTAL HAZARD
Failure to follow this warning could result in property damage or
personal injury or death.
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.
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 to HCFC and CFC
refrigerants. Take all necessary precautions to avoid exposure of the oil
to the atmosphere.
Servicing Systems on Roofs with Synthetic Materials
POE (polyolester) compressor lubricants are known to cause long term
damage to some synthetic roofing materials. 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 appropriate precautions to
protect roofing. 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, coil, accumulator, or reversing valve.
Synthetic Roof Precautionary Procedure
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drip cloth or tarp. Cover an approximate
10x10 ft (3x3 m) area.
2. Cover area in front of the unit service panel with a terry cloth shop
towel to absorb lubricant spills and prevent run-offs, and protect
drop cloth from tears caused by tools or components.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run-offs through
the louvered openings in the unit base.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per local
codes.
Liquid Line Filter Drier
The biflow filter drier is specifically designed to operate with R-410A.
Use only factory-authorized components. Filter drier must be replaced
whenever the refrigerant system is opened. When removing a filter drier,
use a tubing cutter to cut the drier from the system. Do not unsweat a
filter drier from the system. Heat from unsweating will release moisture
and contaminants from drier into system.
R-410A Refrigerant Charging
Refer to unit information plate and charging chart. Some R-410A
refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow
from cylinder in upright position. For cylinders equipped with a dip tube,
charge R-410A units with cylinder in upright position and a commercial
metering device in manifold hose. Charge refrigerant into suction-line.
31
WARNING
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