Carrier 19XL - Manual (Page 204)

Weekly Maintenance
Check the Lubrication System
Mark the oil level on the reservoir sight glass, and observe the level each week while the
machine is shut down.
If the level goes below the lower sight glass, the oil reclaim system will need to be checked
for proper operation. If additional oil is required, add it through the oil drain charging valve
( Figure 2A or Figure 2B ). A pump is required for adding oil against refrigerant pressure. The oil
charge is approximately 8 gallons (30 L). The added oil must meet Carrier specifications for the
19XL. Refer to Changing Oil Filter and Oil Changes sections. Any additional oil that is added
should be logged by noting the amount and date. Any oil that is added due to oil loss that is not
related to service will eventually return to the sump. It must be removed when the level is high.
A 1200-watt oil heater is controlled by the PIC to maintain oil temperature (see the Controls
section) when the compressor is off. The LID Status02 table displays whether the heater is
energized or not. If the PIC shows that the heater is energized, but the sump is not heating up,
the power to the oil heater may be off or the oil level may be too low. Check the oil level, the oil
heater contactor voltage, and oil heater resistance.
The PIC will not permit compressor start-up if the oil temperature is too low. The control will
continue with start-up only after the temperature is within limits.