Ingersoll-Rand Thermo King CRR DF MPC2000, Maintenance Manual

Page: 128 / 165

Refrigeration Maintenance and Service Operations
127
Dehydration, Pressure Testing, Purging and Soldering Procedure
Dehydration, pressure testing, purging and soldering can be accomplished with the use of dry nitrogen
(N2). The proper equipment and application of equipment is of greatest importance.
1. Attach gauge manifold set (refer to “Gauge Manifold Set Attachment and Purging” for proper
procedure for connecting to compressor).
2. Close both hand valves on the gauge manifold (front seated).
3. Connect charging hose to a source of nitrogen. Adjust pressure regulator to the proper pressure for the
required procedure.
4. Purge system high side to low side.
The following procedures should utilize the following MAXIMUM gas pressure:
• Leak Testing: 1030 to 1200 kPa, 10.3 to 12.0 bar, 150-175 psig,
• Purging/Dehydration: 70 to 140 kPa, 0.7 to 1.4 bar, 10-20 psig,
• Soldering: 35 kPa, 0.35 bar, 5 psig.
1. Line Pressure 4. Pressure Test Line to System
2. Tank Pressure 5. Safety Valve
3. Tank 6. Pressure Regulator
Figure 41: Typical Pressurized Gas Bottle with Pressure Regulator and Gauges