Carrier PC211 Start-Up, Operation And Maintenance Instructions Manual page 203

Checking the Auxiliary Switch on Guide Vane Actuator
The auxiliary switch used to activate the oil reclaim system solenoids should move to the
OPEN position when the actuator is 70 degrees open. (At this point the guide vanes should be
30 degrees open.)
Click here for Figure 38 — Guide Vane Actuator Linkage
Trim Refrigerant Charge
If it becomes necessary to adjust the refrigerant charge to obtain optional machine
performance, operate the machine at design load and then add or remove refrigerant slowly
until the difference between leaving chilled water temperature and the cooler refrigerant
temperature reaches design conditions or becomes a minimum. Do not overcharge .
Refrigerant may be added either through the storage tank or directly into the machine as
described in the section entitled,
To remove any excess refrigerant, follow the procedure in
to Storage Tank section, Steps 1a and b.
Refrigerant Charging.
Transfer Refrigerant from Machine