Carrier 19XL - Manual (Page 199)

Adding Refrigerant
Follow the procedures described in Trimming Refrigerant Charge section.
Removing Refrigerant
If the optional pumpout system is used, the 19XL refrigerant charge may be transferred to a
storage vessel, or within the condenser or cooler. Follow procedures in the Pumpout and
Refrigerant Transfer Procedures section when removing refrigerant from the storage tank to the
machine.
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 table 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 65 psig (448 kPa), for HCFC-22, 30 psig (207 kPa) for
HFC-134a.
WARNING
!
WARNING