Carrier 48ES Instruction Manual download pdf (Page 52)

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.

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.

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.

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.

WARNING

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.

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. If you are unsure, consult the equipment

manufacturer.

WARNING

Refrigerant System

This information covers the refrigerant system of the 48ES--A,

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.

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 10 X 10 ft. (3.1 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

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.

TROUBLESHOOTING

Use the Troubleshooting Guides (See Tables 13--15) if problems

occur with these units.

START--UP CHECKLIST

Use Start--Up checklist to ensure proper start--up procedures are

followed.

48ES-- A

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Carrier 48ES Instruction Manual Page 52

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