SHUTOFF AND ALARM SYSTEMS
SHUTOFF WITH TIME DELAY RELAY (Fuel Shutoff
Solenoid Energized To Run)
When the electrical current is turned on to the time delay
relay terminal four, the current will flow to oil pressure
switch (3) and to terminal six of time delay relay (I). From
terminal six the current flows through N.C. switch (4) to
energize fuel shutoff solenoid (5) so the engine will start.
When the engine starts, engine oil pressure will
close the N.O. switch in oil pressure switch (3). This
completes the circuit to time delay relay (1), water
temperature switch (2) and fuel shutoff solenoid (5). N.C.
switch (4) in the time delay relay now opens and breaks
the circuit between fuel shutoff solenoid (5) and terminal
six of the time delay relay.
If the engine coolant temperature goes above the
setting of water temperature switch (2), the N.C. contacts
Time delay relay. 2 Water temperature switch. 3.
Oil pressure switch 4. Switch (N.C.). 5