After Limited Shutdown; Extended Shutdown; After Extended Shutdown - Carrier 17/19EX Start-Up, Operation And Maintenance Instructions Manual

After Limited Shutdown

No special preparations should be necessary. Follow the regular preliminary checks and
starting procedures. Control Power must be maintained in order to keep oil temperature hot and
all control safeties operational. The oil pump on open-drive machines will operate occasionally
to keep the contact seal filled with oil to prevent refrigerant loss.

Extended Shutdown

The refrigerant should be transferred into the utility vessel (see
Transfer Procedures) in order to reduce machine pressure and possibility of leaks. Maintain a
holding charge of 5 to 10 lbs (2.27 to 4.5 kg) of refrigerant within the cooler/condenser/
compressor sections, to prevent air from leaking into the machine.
If freezing temperatures are likely to occur in the machine area, drain the chilled water,
condenser water, and the pump-out condenser water circuits to avoid freeze-up. Keep the
waterbox drains open.
Leave the oil charge in the machine with the oil heater and controls energized to maintain the
minimum oil reservoir temperature.

After Extended Shutdown

Be sure that the water system drains are closed. It may be advisable to flush the water
circuits to remove any soft rust which may have formed. This is a good time to brush the tubes if
necessary.
Pumpout and Refrigerant