43
RS1500000 Rev. 0
Service Information
To avoid risk of electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service unless test procedures require power to be connected. When removing any wiring from
terminals, replace on the same terminals. Ensure all ground wires are connected before certifying unit as repaired
and/or operational.
WARNING
!
HFC134a Service Information
HFC134a Refrigerant
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 irritant
Same
Liquid exposure to eye
Can cause frostbite
Same
Above minimum exposure limit
Can cause Asphyxiation,
Tachycardis, 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 and 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.
Storage conditions
Procedures/rules for
CFC12 also apply for
HFC134a.
Same
Disposal procedures
Recycle or reclaim
Same
Comparison of CFC12 and HFC134a:
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 (-26°C)
Vapor pressure at 77°F (25°C)
80 psig
82 psig
Liquid density at 77°F (25°C)
82 lb/ft3
75 lb/ft3
Flammability
No
No
High-side system operating
HFC134a approximately 3 psig
Pressure at 65°F (18°C) ambient
higher than CFC12
Low-side system operating
HFC134a approximately 2 psig
Pressure at 65°F (18°C) ambient
lower than CFC12
* Compared to CFC 11 = 1
