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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.
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.
For models that have a scroll compressor, 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 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.
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. 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 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 size unit uses 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.
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
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 10 X 10 ft. (3.1 m X 3.1 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
This filter drier is specifically designed to operate with Puron. Use
SAFETY
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.
Puron (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 Puron units with cylinder in upright
position and a commercial metering device in manifold hose.
Charge refrigerant into suction- -line.
Use the Troubleshooting Guides (See Tables 17- -19) if problems
occur with these units.
Use Start- -Up checklist to ensure proper start- -up procedures are
followed.
55
cleaned up, may cause
TROUBLESHOOTING
START- -UP CHECKLIST
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