Installation manual

FuelMaster
®
Installation Manual
75
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NOTE
Whenever pump handle detection is wired into the PHS positions of the Pedestal I/O Board, one leg
of the resistor at positions R92 for hose 1, R93 for hose 2, etc., must be cut to transfer pump handle
detection from LN to PHS.
a. Controlling Reset. See Figure 4-7. This control method interrupts power from the circuit breaker
to each dispenser reset mechanism. Quick and easy; there is no power present if a solenoid
valve sticks open or a reset mechanism or contact starter fails. Figure 4-7 illustrates controlling
reset in a dispenser using two circuit breakers, one per hose. Some arrangements may only be
using one breaker. The power from one breaker may be brought into LN1, then jumped to LN2.
The diagram also illustrates wiring pump handle detection into the FMU. Pump handle detection
is only possible through an END ONLY pump handle configuration, and only with FuelMaster
®
Plus FMUs. If pump handle detection is not needed, or not possible, omit those wires connected
to the PHS positions on TB3. Control will still be attained, but pump handle detection will not be
present.
Some distributors/customers prefer to control reset power by running power from the breaker to
the FMU, then running authorization power from the FMU to the dispenser. This precludes
someone from breaking into the dispenser and bypassing the FMU with a simple jumper wire:
WARNING
Each dispensing device must be provided with a means to remove all external voltage sources
during periods of maintenance and service of the dispensing equipment. Ref: NFPA 70 (2008
edition), para 514.13. When two or more dispensers utilize the same STP (submersible turbine
pump) control relay/contact starter, power supplied by one dispenser to activate a control relay must
be isolated to prevent feed back to another dispenser. Failure to do so may result in electrical shock
while performing dispenser maintenance.
AVERTISSEMENT
Chaque dispositif de distribution doit être muni d'un moyen de supprimer toutes les sources de
tension externe pendant les périodes de maintenance et de service de l'équipement de distribution.
Ref: NFPA 70 (édition 2008), par 514,13. Lorsque deux ou plusieurs distributeurs utilisent la même
STP (pompe à turbine submersible) relais de commande / contact démarreur, puissance fournie par
un distributeur pour activer un relais de contrôle doivent être isolés pour empêcher l'alimentation de
retour à un autre distributeur. Ne pas le faire peut entraîner un choc électrique pendant que la
maintenance du distributeur de la scène.
NOTE
When controlling reset in a dual hose, single product application, inputs to the STP control
relay/contact starter must be isolated to prevent feedback to an unauthorized hose. If the inputs are
not isolated, feedback may activate the unauthorized solenoid valve and permit fueling through an
unauthorized hose. Figure 4-8 illustrates one solution to prevent feedback. Other solutions using
STP isolation relays, or a different control method, are possible.
1) Find the incoming power to the dispenser reset mechanism for hose 1. It is most likely a wire
routed directly from the circuit breaker panel. Remove power at the circuit breaker.
2) Run a wire from the power source to LN1. This wire does not need to be routed from the
dispenser to the FMU. It may be routed directly to the FMU from the power source without
passing through the dispenser. If a dual hose dispenser is being wired, and there is only one
power source, run a jumper wire from LN1 to LN2.
3) If pump handle detection will be wired, run two wires per hose from the FMU to the
dispenser. If pump handle detection will not be wired, run one wire per hose from the FMU to
the dispenser.
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