All compressors in these units have internal overload protection. This protection will interrupt motor current under fault
conditions such as running current overload. The Scroll compressors also have internal pressure relief that will relieve
from the high side to the low side if the differential is excessive.
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. Gauge 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 -
Use only manufacturer suggested compressor oil, see Table 5 for correct oil.
NOTE
: Alternate manufacturer approved compressor oil for 48 unit with Scroll compressor: Uniqema RL32-3MAF,
Copeland Ultra 32 CC, Mobil Arctic EAL22 CC, ICI Emkarate RL22 or ICI Emkarate 32CF.
This oil is extremely hygroscopic, meaning it absorbs water readily. POE/PVE 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.
Servicing Systems on Roofs with Synthetic Materials -
POE/PVE 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 10 x 10 ft (3 x 3 m) area.
2. Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills, 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 filter drier is specifically designed to operate with Puron (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.
Puron (R-410A) Refrigerant Charging -
Refer to unit information plate and charging chart. Some Puron (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 (R-410A) units with cylinder in upright position and a commercial metering
device in manifold hose. Charge refrigerant into suction-line.
WARNING
EXPLOSION, ENVIRONMENTAL SAFETY 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.
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