Trane CVGF500 Installation, Operation & Maintenance Manual page 44

General Information
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Differential Oil Pressure Overdue
is a latching diagnostic that can come up while the unit is in prelube.
The differential pressure switch status is used instead of the Low Differential Oil Pres-
sure Cutout setpoint.
Low Differential Pressure Cutout
is a latching diagnostic that can come up while the unit is running. Oil pressure is in-
dicative of oil flow and active oil pump operation. Significant fall in oil pressure is in-
dicative of failure of the oil pump, oil leakage, or other blockage in the oil circuit.
Once oil flow has been established, if the differential pressure switch indicates there is
not oil pressure for 2 seconds, this diagnostic will be issued.
Unexpected Differential Oil
Pressure is a latching diagnostic that can come up while the unit is idle and is imple-
mented to recognize and ensure that the pressure switch is operational and that it is
open for a period of five minutes.
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AdaptiView displays a mode Waiting for Low Oil Differential Press.
The check is made if oil pump is off and before it is turned on.
AdaptiView allows five minutes for the differential oil pressure switch to open.
This check is performed on power up or reset also. If a MPL occurred or power up
was within the post-lube time, oil pump is running so do not do the check.Protec-
tive Diagnostics and their description
CVGF-SVX03B-EN