131
Refrigeration Maintenance and Service
Operations
NOTE: The following procedures involve
servicing the refrigeration system. Some of these
service procedures are regulated by Federal, and
in some cases, by State and Local laws.
All regulated refrigeration service procedures
must be performed by an EPA certified
technician, using approved equipment and
complying with all Federal, State and Local
laws.
NOTE: Replace the one-piece filter drier when
major system contamination requires evacuation
and cleanup of the refrigeration system.
Service Tools
Unit Service Fittings
Special fittings are used on R-404A systems to
prevent mixing of non-HFC refrigerants in
R-134A units. These fittings are located in three
places on CRR refrigeration systems:
• Low side near the compressor suction service
valve (or suction adapter),
• High side near the compressor discharge
service valve (or discharge manifold),
Leak Detection
Leaks can be detected with the use of soap
bubbles and with Halogen leak detectors such as
model H10G, or model H10N (portable).
Gauge Manifold Set
A new gauge manifold set (refer to Tool Catalog)
should be dedicated for use with R-134a only.
Gauge hoses should also be dedicated to R-404A.
1. Internal Threads for Cap
2. High Pressure Fitting
3. Low Pressure Fitting
Figure 37: Service Fittings Specifications
AXA0175
CAUTION: When servicing Thermo King
R-404A refrigeration systems, use only
those service tools (i.e., vacuum pump,
refrigerant recovery equipment, gauge
hoses, and gauge manifold set) certified
for and dedicated to R-404A refrigerant
and Polyol Ester based compressor oils.
Residual non-HFC refrigerants or
non-Ester based oils will contaminate
HFC systems.
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