Preparation for Extended Shutdown —

Preparation for Extended Shutdown — The refrigerant should be transferred into the pump out storage tank (if supplied; see Pump out and Refrigerant Transfer Procedures) to reduce chiller pressure and the possibility of leaks. Maintain a holding charge of 5 to 10 psi (34 to 69 kPa) of refrigerant or nitrogen to prevent air from leaking into the chiller. If freezing temperatures are likely to occur in the chiller area, drain the chilled liquid, condenser liquid, and the pumpout condenser liquid circuits to avoid freeze-up. Keep the waterbox drains open. Leave the oil charge in the chiller with the oil heater and controls energized to maintain the minimum oil reservoir temperature.