SHUTOFF AND ALARM SYSTEMSSYSTEMS OPERATIONWATER TEMPERATURE AND OIL PRESSURESHUTOFF WITH TIME DELAY RELAY (Fuel ShutoffSolenoid Energized To Run) When the electrical current is turned on to the time delayrelay terminal four, the current will flow to oil pressureswitch (3) and to terminal six of time delay relay (I). Fromterminal six the current flows through N.C. switch (4) toenergize fuel shutoff solenoid (5) so the engine will start.When the engine starts, engine oil pressure willclose the N.O. switch in oil pressure switch (3). Thiscompletes the circuit to time delay relay (1), watertemperature switch (2) and fuel shutoff solenoid (5). N.C.switch (4) in the time delay relay now opens and breaksthe circuit between fuel shutoff solenoid (5) and terminalsix of the time delay relay.If the engine coolant temperature goes above thesetting of water temperature switch (2), the N.C. contactswill open. This stops current flow throughWIRING DIAGRAM1.Time delay relay. 2 Water temperature switch. 3.Oil pressure switch 4. Switch (N.C.). 5Fuel shutoffsolenoid.28
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