Maytag 111405-1 Service Manual download pdf (Page 11)

11 16021730 Rev. 0

Service Procedures

WARNING

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.

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.

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

Properties/Characteristics CFC12 HFC134a

Ozone Depletion Potential

(ODP)

1.0* 0.0*

Global Warming Potential

(GPW)

3.2* 0.27*

Molecular weight 121 102

Boiling point at 1 atmosphere -22°F (-30°C) -15°F (-

126°C)

Vapor pressure at 77°F

(25°C)

80 psig 82 psig

Liquid density at 77°F (25°C) 82 lb/ft

75 lb/ft

Flammability No No

High-side system operating

Pressure at 65°F (18°C)

HFC134a approximately 3 psig

higher than CFC12

Low-side system operating

Pressure at 65°F (18°C)

HFC134a approximately 2 psig

lower than CFC12

Comparison of CFC12 and HFC134a Properties

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.

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Maytag 111405-1 Service Manual Page 11

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