Carrier 19XL - Manual (Page 164)

Check Optional Pumpout System Controls and Compressor
Controls include an on/off switch, a 3-amp fuse, the compressor overloads, an internal
thermostat, a compressor contactor, and a refrigerant high pressure cutout. The high pressure
cutout is factory set to open at 220 ± 5 psig (1250 ± 34 kPa), and automatically reset at 185
+0,–7 (1280 +0,–48 kPa) with HCFC-22. HFC-134a units open at 161 psig (1110 kPa) and
reset at 130 psig (896 kPa). Check that the water-cooled condenser has been connected.
Loosen the compressor holddown bolts to allow free spring travel. Open the compressor
suction and discharge service valves. Check that oil is visible in the compressor sight glass.
Add oil if necessary.
See Pumpout and Refrigerant Transfer Procedures and Optional Pumpout System
Maintenance sections, for details on transfer of refrigerant, oil specifications, etc.
High Altitude Locations
Recalibration of the pressure transducers will be necessary as the machine was initially
calibrated at sea level. Please see the calibration procedure in the Troubleshooting Guide
section.