CONTROL PANEL (TYPE 5)
SYSTEMS OPERATION
Engine Shutdown Caused by Water
Temperature Failure
When engine coolant temperature becomes too high, the normally
open water temperature switch (WTS) closes. This, in turn, energizes
the water temperature relay (WTR). Contact (WTR1) closes to lock in
the relay (WTR).
The normally closed contact (WTR2) opens. This de-energizes run
relay (RR). Contact (RR2) closes and contact (RR1) opens. (RR2)
closed completes a circuit to shut-off solenoid (SS) until (TDX) opens (70
seconds after OPS opens). (RR1) open de-energizes the arming relay
(AR).
Diode (DI) helps prevent electrical sparks (arcing) at the contacts in
the shut-off solenoid circuit, when the shut-off solenoid is de-energized.
The water temperature indicating relay (WTR) will light. To start the
engine, do the steps that follow:
1.
Turn engine control switch (ACS) to OFF or STOP.
NOTE: For start-up when (OCR) indicating relay gives light,
make reference to topic ENGINE DOES NOT START.
2.
Correct the high water temperature problem.
3.
Rotate ACS to OFF/RESET position. This de-energizes the
(WTR). Contact (WTR1) will close to energize the run relay coil.
Contact (WTR2) will open to de-energize the shutdown solenoid.
4.
The system is ready to start if engine control switch (ACS) is
turned to MAN or AUTO.
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