Trane CXAO Installation Operation & Maintenance page 35

Power supply to the auxiliary circuit
The connection to the power circuit is internal to the
panel and is performed in the factory. The compressor
oil heaters, guards against the overheating of the
compressor, and the probe safety chilled water are
connected so as to be operational always, as long as
there is power to the electrical panel.
Scroll compressor
Checking the oil charge
Compressors are charged with oil at the factory. The
scroll compressors are equipped with an oil sight
glass from which you can control the level. The precise
level should be between two marks that indicate the
minimum and maximum allowable levels. In tandem
or trio performances, pay particular attention to oil
level. Not perfectly leveled sight glasses between
compressors in parallel, but falling in the upper and
lower limits, are considered normal.
Next to the lamp there is a connection on every
compressor for draining the oil and a connection for
refi lling.
To refi ll oil, there is a ¼" Schrader connection.
To refi ll oil, it is necessary to discharge the refrigerant
in the unit, recovering it in adequate cylinders. Then
vacuum until you reach a pressure of about 6 Pa to
remove any trace of humidity from the circuit. Then
load the unit with a small amount of refrigerant and fi ll
oil from the proper connection for refi lling.
Add oil until the oil sight glass is fl at within the upper
and lower limits indicated by the corresponding
notches. At this point refi ll the previously discharged
amount of refrigerant as in the indications above.
Restart the compressor. Run for 20 minutes at full load
and check the oil level.
RF-SVX003A-GB
Oil compressor load
Oil fi ll connection
and gauge port
Oil sight
glass
Oil drain
connection
35