Carrier 48XL User Manual download pdf (Page 30)

670 psig shutting down the compressor, while HPS2 opens at 363,

limiting the compressor to low-stage operation only.

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 (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.

A WARNING

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 anti-rotational

device and an internal pressure-relief port. The anti-rotational

device prevents the scroll from turning backwards and replaces the

need for a cycle protector. The pressure-relief port is a safety

device, designed to protect against extreme high pressure. The

relief port has an operating range between 330 and 623 psi

differential pressure.

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

A WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could result in personal

injury 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.

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 13 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, 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 (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,

3, 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. 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-4I0A) 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.

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 В in

Start-Up & Troubleshooting and Table 3, as well as the UI

instructions, for additional information. Additional

Troubleshooting information can be found in Table 10,

MAJOR COMPONENTS

2-STAGE HP/AC BOARD

The two-stage HP/AC control board controls the following

functions:

- Low- and high-stage compressor operation

- Outdoor fan motor operation

- Reversing valve operation

COMPRESSOR OIL

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Carrier 48XL User Manual Page 30

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