Transfer Refrigerant to the Condenser RTAC

Issue:

Can I do a service pumpdown and store the refrigerant in the condenser?

Resolution:

RTAC Chillers:

For packaged RTAC Chillers, it is possible to store the refrigerant in the condenser. It is important to follow the following procedure:

• Ensure that the circuit is turned off.
• Close the liquid line service valve.
• Close the oil return line service valve.
• Start the circuit using the service tool (access the compressor service view in Techview).
  • All fans will be turned on.
  • The EXV will open to 100%.
  • The oil return line solenoid (if included) will open.
  • The unit will start at minimum load.
  • The unit will run until it cuts out on low pressure (approximately 6 psia).
  • Monitor the suction pressure using a gauge.
• When the unit trips, the discharge check valve will close.
• Close the discharge isolation valve.
• Close the 7/8" oil line shut off valve.
• Recover the remaining refrigerant.

Note: Any remaining vapor can be recovered and stored in the high side of the system. It is important to follow proper recovery procedures to avoid introducing non-condensable gases.

The low side and compressor can be serviced at this time.

Notes:

Remote Evaporator ONLY:  Because of additional refrigerant piping and charge, the condenser may not be capable of holding the entire charge. 

Other Question/Problem/Cause Statements:

• Can I do a service pumpdown and store the refrigerant in the condenser?
• How do I do a service pumpdown?

Facts:

• Air-Cooled Chiller (Pueblo) (RTAC)