System operating procedures
Oil heaters
If the oil heater is de-energized during a shutdown period, it must be energized for 12 hours before
starting compressor, or remove all oil and recharge compressor with new oil. See Oil charging
procedure.
Oil heater operation
The oil heater operation is controlled by the OptiView
™
Control Center. The heater is turned on
and off to maintain the oil temperature differential to a value 50°F (27.8°C) above the condenser
saturation temperature. This target value is maintained by the control panel.
If the target value is greater than 160°F (71°C), the target defaults to 160°F (71°C). If the target
value is less than 110°F (43.3°C), it defaults to 110°F (43.3°C).
To prevent overheating of the oil in the event of a control center component failure, the oil heater
thermostat (1HTR) is set to open at 180°F (82°C).
Checking the oil level in the oil reservoir
Correct operating oil level: During operation, the oil level falls to the OPERATING RANGE identified
on the vertical oil level indicator label. See Figure 3.
Figure 3: Oil level indicator
• If the oil level during operation is in the OVER FULL region of the oil level indicator, remove oil
from the oil reservoir. This reduces the oil level to the OPERATING RANGE.
• If the oil level during operation is in the LOW OIL region of the oil level indicator, add oil to
the oil reservoir. See Oil charging procedure.
11Model YK (Style H), R-134a and R-513A
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