Figure 4-12. Wiring Diagram - Using Dual Control Relay Assembly (Dcra) To Control Two Devices - Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual

Fuel management unit (fmu)

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FuelMaster

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Repeat steps 1 through 7, as required, for all additional hoses.

Figure 4-12. Wiring Diagram - Using Dual Control

Relay Assembly (DCRA) to Control Two Devices

d. Using Dual Control Relay Assembly (DCRA) to Control Two Devices. See Figure 4-12.

Classic and DoD FMUs do not provide for control of dispenser reset while also providing pump

handle detection. If it is desired to use a classic or DoD FMU to control solenoid valves and

pump motors, and still have pump handle detection, it may be accomplished using a DCRA. The

DCRA provides an additional set of relays to control two devices with each hose selection. This

control method interrupts power from the dispenser reset mechanism to both solenoid valves

and pump motors, and allows dispenser reset without authorization, but prevents pump motor

activation until authorized. Pump handle detection is possible from all variations of FMUs.

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