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Section E
R-134A SERVICE INFORMATION
N OTICE
Instructions given here are furnished as a guide. Persons attempting to use these
instructions to make repairs to the sealed refrigeration system should have a working
knowledge of refrigeration and previous training on sealed system repair.
Verify Refrigerant Type In The System
CAUTION
R-134a and R-12 are completely incompatible. Before starting any sealed system repair,
it is extremely important to check serial plate of product to verify the type of refrigerant
in the system.
Dedicated Equipment
R-134a must not be mixed with other types of refrigerants. R-134a must be
recovered in dedicated and properly identified recovery bags and tanks.
It will be necessary to check with the manufacturer of your recovery equipment to
determine R-134a compatibility. Some recovery equipment manufacturers have
changeover instructions for switching between refrigerant types. Protect yourself
and your equipment by following all manufacturer guidelines.
Also, ensure that your refrigeration hoses are specified for use with R-134a
refrigerant. Research has shown that compounds in standard refrigeration hoses
may enter sealed systems and ultimately restrict the cap tube in an R-134a
system.
R-134a Refrigeration Systems
The sealed refrigeration system will consist of the same basic components being
utilized in the R-12 systems.
There is a 10% to 15% discharge pressure increase using R-134a, with a 5% to
10% decrease in suction pressure when compared to the same product with an
R-12 system operating at 90°F (32°C) ambient temperature conditions. Lower
suction pressures result from the lower density of R-134a refrigerant which effects
refrigerant flow rate. R-134a systems commonly operate in a 1"-2" vacuum on the
suction side.
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