Carrier PC211 Start-Up, Operation And Maintenance Instructions Manual page 168

adding the condenser charge to the cooler charge listed in
Always operate the condenser and chilled water pumps during charging operations to
prevent freeze-ups. Use the Control Test Terminate Lockout to monitor conditions and start the
pumps.
If the machine has been shipped with a holding charge, the refrigerant will be added through
the refrigerant charging valve
connection. First evacuate the nitrogen holding charge from the vessels. Charge the refrigerant
as a gas until the system pressure exceeds 68 psig (469 kPa) for HCFC-22; 35 psig (141 kPa)
for HFC-134a. After the machine is beyond this pressure the refrigerant should be charged as a
liquid until all of the recommended refrigerant charge has been added.
(Figure 27 and Figure
Table 9.
28, valve 7) or to the pumpout charging