670 psig shutting down the compressor, while HPS2 opens at 565, limiting the compressor to
High pressure may be caused by a dirty outdoor coil, failed fan motor, or outdoor air recirculation.
To check switches:
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 psi. Never open system without breaking vacuum with dry nitrogen.
Copeland Scroll Compressor (Puron Refrigerant)
The compressor used in this product is specifically designed to
operate with Puron
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.
EXPLOSION, FIRE 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.
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
The Copeland scroll compressor uses Mobil 3MA POE oil. This is the only oil allowed for oil recharge.
Refrigerant System
This step covers the refrigerant system of the 48XL, including the compressor oil needed, servicing systems on roofs containing synthetic materials, the filter drier, and refrigerant charging.
REFRIGERANT
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal
iniury or equipment damage.
This system uses Puron
hoses, and recovery system nmst be designed to handle
Puron. If you are unsure, consult the equipment manufacturer.
COMPRESSOR OIL
The compressor in this system uses a polyolester (POE) oil, Mobil 3MA POE. 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.
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, and replacing refrigerant components such as filter drier, pressure switch, metering device, coil, accunmlator, or reversing valve.
Synthetic Roof Precautionary Procedure
1.Cover extended roof working area with an in,permeable polyethylene (plastic) drip cloth or tarp. Cover an approximate 10 X 10 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
3.Place terry cloth shop towel inside unit immediately under component(s) to be serviced and prevent lubricant
4.Perform required service.
5.Remove and dispose of any
LIQUID-LINE FILTER DRIER
The filter drier is specifically designed to operate with Puron. Use only
PURON (R-410A) REFRIGERANT CHARGING
Refer to unit information plate and charging chart. Some
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.
TROUBLESHOOTING
LED DESCRIPTION
LEDs built into Infinity control boards provide installer or service
person information concerning operation and/or fault condition of the unit controls and ECM motor. This information is also
available at the system UI in text with basic troubleshooting instructions. Careful use of information displayed will reduce the need for extensive manual troubleshooting. See section B in
instructions, for additional information. Additional Troubleshooting information can be found in Table 10.
MAJOR COMPONENTS
2-STAGE HP/AC BOARD
The
-Low- and
-Outdoor fan motor operation
-Reversing valve operation
3O
