Maytag Ice2O MFI2665XEM Owner's Manual download pdf (Page 16)

To minimize contamination, exercise extreme care

when servicing HFC134A sealed systems.

• No trace of other refrigerants is allowed in HFC134a

systems. Chlorinated molecules in other refrigerants

such as CFC12, etc. will lead to capillary tube

plugging.

• Ester oil is used in HFC134a systems. Do not use

mineral oil. HFC134a and mineral oils cannot be

mixed. If mineral oils were used in HFC134a systems,

lubricant would not return to compressor and would

cause early compressor failure. If significant amount of

oil has been lost from compressor, replace oil rather

than adding oil.

• Ester oils used in HFC134a systems are so

hydroscopic that by the time an inadequate system

performance is detected, oil will be saturated with

moisture.

• CFC12 has much higher tolerance to system

processing materials, such as drawing compounds,

rust inhibitors, and cleaning compounds, than

HFC134a. Such materials are not soluble in HFC134a

systems. If materials were to be washed from system

surfaces by ester oils, they could accumulate and

eventually plug capillary tube.

• Care must be taken to minimize moisture entering

HFC134a system. Do not leave compressor or system

open to atmosphere for more than 10 minutes.

Excessive moisture in HFC134a system will react with

compressor oil and generate acid.

• Compressor must be replaced when performing low

side leak repair.

• Drier filter must always be replaced with service drier

filter, part #B2150504.

Important: Unbrazing drier filter from tubing will drive

moisture from desiccant and into system, causing

acids to form. Do not unbraze filter drier from tubing. If

CFC12 service drier was installed in HFC134A system,

drier could overload due to excessive moisture.

• HFC134a compatible copper tubing, part #R0174075

(1/4" O.D. X 18" length) and part #R0174076 (5/16"

O.D. X 24" length) must be used when replacing

tubing.

• Avoid system contamination by using Towerdraw E610

evaporating oil, part # R0157532, when flaring,

swaging, or cutting refrigeration tubing.

Service Procedures

HFC134a Service Information

HFC134a is alternative refrigerant for CFC12.

HFC134a has an ozone depletion potential (ODP)

factor of 0.0 and a global warming potential (GWP)

factor of 0.27. HFC134a is not flammable and has

acceptable toxicity levels. HFC134a is not

interchangeable with CFC12. There are significant

differences between HFC134a and CFC12 which must

be considered when handling and processing

refrigeration system.

Health, Safety, and Handling

Health, safety and handling considerations for

HFC134A are virtually no different than those for

CFC12.

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test

procedures require power to be connected. Discharge capacitor through a 10,000 ohm resistor before attempting

to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.

WARNING

CAUTION

Health, Safety, and

Handling

CFC12 HFC134a

Allowable overall

exposure limit

1,000 ppm Same

Vapor exposure to skin No effect Same

Liquid exposure to skin Can cause frostbite Same

Vapor exposure to eye Very slight eye irritant Same

Liquid exposure to eye Can cause frostbite Same

Above minimum exposure

limit

Can cause Asphyxiation,

Tachycardia, and Cardia

Arrhythmias

Same

Safety and handling Wear appropriate skin

and eye protection. Use

with adequate

ventilation.

Same

Spill management Remove or extinguish

ignition or combustion

sources. Evacuate or

ventilate area.

Same

Fire explosion hazards May decompose if

contact with flames and

heating elements.

Container may explode

if heated due to resulting

pressure rise.

Combustion products

are toxic.

Same

Disposal procedures Recycle or reclaim. Same

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Maytag Ice2O MFI2665XEM Owner's Manual Page 16

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