Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 7-4
Alarm
NO.
Steps ALARM / CAUSE CORRECTIVE ACTION
7.4 SHUTDOWN ALARMS
11 LOW ENGINE OIL PRESSURE

TRIGGER-ON: Engine oil pressure is below 0.82 bar (12 psig) for longer than 5 seconds while the
engine is running.

UNIT CONTROL: Engine operation: Shutdown and alarm.
Standby operation: Will not activate in standby.

RESET CONDITION: Auto Reset, or alarm may be manually reset via Keypad or by turning the unit
off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1 Check Engine Oil Level
a. Check oil dipstick. Add oil as needed.
2
Check Engine Oil Pressure Switch Wiring
a. Inspect switch & connector pins &
terminals. (See wiring schematic
Section 10.)
No physical damage to harness.
No damaged or corroded pins.
b. Check switch circuit
Check for voltage at the switch
plug between pins A (+) and B
(ground).
Energize circuit (refer to Note 2 Page 7-2).
Voltage should be approximately 12 VDC.
3 Check Engine Oil Pressure Switch
a. Remove switch, connect to an
external pressure source and test.
Contacts close on a pressure rise when pressure is
above 1.02 bar (15 psig).
Contacts open on a pressure fall when pressure is
below 0.82 bar (12 psig).
4 Check Engine Oil Pressure
a. Connect mechanical oil gauge. Oil pressure must be greater than 1.02 bar (15 psig).