Hfc134A Service Information; Health, Safety, And Handling; Comparison Of Cfc12 And Hfc134A Properties - Amana AB1924PEK Series Instruction Manual

Service Procedures
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 resistor before attempting to service.
Ensure all earthing 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
Allowable overall
exposure limit
Vapor exposure to skin
Liquid exposure to skin
Vapor exposure to eye
Liquid exposure to eye
Above minimum exposure
limit
Safety and handling
Spill management
Fire explosion hazards
Disposal procedures

Comparison of CFC12 and HFC134a Properties

Properties/Characteristics
Ozone Depletion Potential
(ODP)
Global Warming Potential
(GPW)
Molecular weight
Boiling point at 1 atmosphere
Vapor pressure at 77°F
(25°C)
Liquid density at 77°F (25°C)
Flammability
High-side system operating
Pressure at 65°F (18°C)
Low-side system operating
Pressure at 65°F (18°C)
16
!
CFC12 HFC134a
1,000 ppm Same
No effect Same
Can cause frostbite Same
Very slight eye irritant Same
Can cause frostbite Same
Can cause Asphyxiation, Same
Tachycardia, and Cardia
Arrhythmias
Wear appropriate skin Same
and eye protection. Use
with adequate
ventilation.
Remove or extinguish Same
ignition or combustion
sources. Evacuate or
ventilate area.
May decompose if Same
contact with flames and
heating elements.
Container may explode
if heated due to resulting
pressure rise.
Combustion products
are toxic.
Recycle or reclaim. Same
CFC12 HFC134a
1.0* 0.0*
3.2* 0.27*
121 102
-22°F (-30°C) -15°F (-
126°C)
80 psig 82 psig
3
82 lb/ft 75 lb/ft
No No
HFC134a approximately 3 psig
higher than CFC12
HFC134a approximately 2 psig
lower than CFC12
16023324 Rev. 0
WARNING
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
.635 millimeter x 457.2 millimeter length and part
#R0174076 7.93 millimeter x 609.6 millimeter must be
used when replacing tubing.
3 • Avoid system contamination by using Towerdraw E610
evaporating oil, part # R0157532, when flaring,
swagging, or cutting refrigeration tubing.
!
CAUTION
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