Ingersoll-Rand Thermo King CRR DF MPC2000, Maintenance Manual

Page: 102 / 165

101
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: It is generally good practice to replace the filter drier whenever the high side is opened or when
the low side is opened for an extended period of time.
Service Tools
R-134a Service Fittings and Gauge Manifold Set
Special fittings are used on the CRR DF R-134a refrigeration circuit to prevent mixing of non-HFC
refrigerants in the system. These fittings are located in three places:
• Low side near the compressor suction service valve,
1. Internal Threads for Cap
2. High Pressure Fitting
3. Low Pressure Fitting
Figure 22: R-134a Service Fittings Specifications
CAUTION: R-134a and R-23 are HFC (Hydrofluoro-carbon) refrigerants. When servicing the
CRR DF 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 HFC
refrigerants and Polyol Ester based compressor oils. Residual non-HFC refrigerants or
non-Ester based oils will contaminate HFC systems. Separate service tools should be dedicated
to R-134a and R-23 refrigerant systems.