Installation manual

FuelMaster
®
Installation Manual
77
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b. Controlling Motors. See Figure 4-9. When controlling a classic or DoD FMU, and pump handle
detection is needed, the control method most likely used will be controlling motors or solenoid
valves. If solenoid valves are not present, motors must be controlled. There must be one motor
feed per hose. Motor control interrupts power from the dispenser reset mechanism to a suction
pump motor or contact starter for a submersible pump motor. Siphoning from aboveground tanks
is possible if solenoid valves or anti-siphon valves are not present. Pump handle detection is
possible from all variations of FMUs.
Motors may be suction pump or submersible. Suction pump motors will most likely be wired
directly to the dispenser reset mechanism. Submersible motors will most likely be controlled by a
contact starter being powered through the dispenser reset mechanism. The contact starter will
be remotely located away from the dispenser.
Figure 4-8. Wiring Diagram - Controlling Reset in Dual Hose
Single Product Dispenser without Backfeed (One Solution)
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