Low Side Pump Down (R-134a Compressor Only)

Note Do NOT pump down a scroll compressor. Reclaim the refrigerant when servicing the low side or high side of the R-23 refrigeration system.

  1. Install the gauge manifold on the compressor.

  2. Set the controller setpoint temperature well below the return air temperature and operate the unit in the Cool mode until the temperature stabilizes (at least 5 minutes).

  3. Close the receiver tank outlet valve. Allow the unit to operate until it reaches -15 to -40 kPa, -0.15 to -0.40 bar, 5 to 11 in. vacuum on the suction pressure gauge (3-5 minutes). Then shut the unit down manually with the On/Off switch.

      Notice
    • Equipment Damage
    • To prevent air and moisture contamination, do not open the low side of system while in vacuum.

  4. To place the unit back in service, open the receiver tank outlet valve and turn the On/Off switch ON.

Parent topic: Refrigeration Maintenance