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Oil Charge
If oil is added, it must meet Carrier’s specification for centrifugal compressor usage as
described in the Scheduled Maintenance, Oil Specification section.
On hermetic machines, add oil through the oil drain charging valve (Figure 3, Item 26). A
pump is required for adding oil against refrigerant pressure. The pumping device must be able
to lift from 0 to 150 psig (0 to 1034 kPa) or above unit pressure. On open-drive machines, oil
may be added through the oil drain and charging valve (Figure 2, Item 18) using a pump.
However, an oil charging elbow on the seal-oil return chamber (Figure 6) allows oil to be added
without pumping. The seal oil return pump automatically transfers the oil to the main oil
reservoir.
Oil should only be charged or removed when the machine is shut down. Maximum oil level is
the middle of the upper sight glass.
Power Up the Controls and Check the Oil Heater
Ensure that an oil level is visible in the compressor before energizing controls. A separate
disconnect energizes the oil heater and the control circuit. When first powered, the LID should
display the default screen within a short period of time.
The oil heater is energized by powering the control circuit. This should be done several hours
before start-up to minimize oil-refrigerant migration. The oil heater is controlled by the PIC and
is powered through a contactor in the power panel. Starters contain a separate circuit breaker to