CRR-20 & CRR-40, September 1999
NOTE: The following procedures involve servicing
the refrigeration system. Some of these service pro-
cedures 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: It is generally good practice to replace the fil-
ter drier whenever the high side is opened or when
the low side is opened for an extended period of
time.
Service Tools
CAUTION: When servicing Thermo King R-134a
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-134a refrigerant and Polyol Ester
based compressor oils. Residual non-HFC refriger-
ants or non-Ester based oils will contaminate HFC
systems.
Unit Service Fittings
Special fittings are used on R-134a 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 suc-
tion adapter),
• High side near the compressor discharge service valve (or
discharge manifold),
• High side near the receiver tank outlet valve.
Leak Detection
Leaks can be detected with the use of soap bubbles and with
Halogen leak detectors such as model H10G, P/N 204-712 or
model H10N, P/N 204-756 (portable).
Gauge Manifold Set
A new gauge manifold set (P/N 204-758) should be dedicated
for use with R-134a only. Gauge hoses should also be dedicat-
ed to R-134a.
Vacuum Pump
A two-stage (P/N 204-725), three-stage or five-stage pump is
recommended for evacuation. Purging the system with dry
nitrogen is recommended before evacuation. Because residual
refrigerant may be present in used vacuum pumps, a new vacu-
um pump should be used and dedicated strictly as an R-134a
refrigerant pump. Use only recommended vacuum pump oils
and change oil after every major evacuation.
6
Refrigeration Maintenance
and Service Operations
Service Fittings Specifications
1. Internal Threads for Cap
2. High Pressure Fitting
3. Low Pressure Fitting
Содержание CRR-20
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