Thermo King 098203, Maintenance Manual

Page: 183 / 264

Refrigeration Maintenance
181
Recovering Refrigerant from the System
When removing any refrigerant from a Thermo King refrigeration system, use a recovery process that
prevents or absolutely minimizes the refrigerant escaping to the atmosphere. Typical service procedures
that require removal of refrigerant from the unit includes the following:
• Reduce the refrigerant pressure to a safe working level when maintenance must be performed on
high-pressure side components.
• Empty the unit of refrigerant when an unknown amount of charge is in the system and a proper charge
is required.
• Empty the unit of contaminated refrigerant when the system has become contaminated.
NOTE: Always refer to specific recovery equipment Operator and Service Manuals.
Perform the following steps to recover vapor from the system.
1. Turn unit off.
2. Install a gauge manifold set on the unit.
3. Attach the service line to the recovery machine and properly purge the lines.
4. Set the recovery machine for vapor recovery.
5. Mid-seat the discharge service valve.
6. Turn on the recovery machine.
7. Open (back seat) both gauge manifold and hand valves.
8. Continue to operate the recovery machine until unit pressures drop to 0 kPa, 0 bar, 0 psig pressure.
CAUTION: Use only refrigerant recovery equipment approved for and dedicated to R-404A
recovery.