Carrier 17/19EX - Manual (Page 196)

Adding Refrigerant
Follow the procedures described in Charge Refrigerant into Machine section.
Removing Refrigerant
When the optional pumpout system is used, the 17/19EX refrigerant charge may be
transferred to a storage vessel, or within the utility vessel. Follow procedures in the Pumpout
and Refrigerant Transfer Procedures section when removing refrigerant.
Adjusting the Refrigerant Charge
If the addition or removal of refrigerant is required for improved machine performance, follow
the procedures given under the Trim Refrigerant Charge section.
Always use the compressor pumpdown function in the Control Test mode to turn
on the evaporator pump and lock out the compressor when transferring refriger-
ant. Liquid refrigerant may flash into a gas and cause possible freeze-up when the
machine pressure is below 30 psig (207 kPa) for HFC-134a.
WARNING
!
WARNING