Carrier 17/19EX - Manual (Page 164)

Charge Refrigerant into Machine
The 17/19EX machine may have the refrigerant already charged in the utility vessels. If
machine is not shipped fully charged, refrigerant is shipped separately to conform with
transportation regulations. The 17/19EX may be ordered with a nitrogen holding charge of
15 psig (103 kPa). Evacuate the entire machine, and charge machine from refrigerant cylinders.
The full refrigerant charge on the 17/19EX will vary with machine components and design
conditions, indicated on the job data specifications. An approximate charge may be found in
17/19EX Physical Data section. The full machine charge is printed on the machine identification
label.
Always operate the condenser and chilled water pumps during charging operations to
prevent freeze-ups. Use the Controls 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
CAUTION CAUTION
!
The transfer, addition, or removal of refrigerant in spring isolated machines may
place severe stress on external piping if springs have not been blocked in both
up and down directions.