Installation manual

FuelMaster
®
Installation Manual
43
Conduit entering an FMU typically enter the FMU through the opening in the base of the pedestal. If
conduit enter the FMU through holes punched/drilled through its exterior, the holes must be sealed to
prevent water intrusion into the FMU. Keep in mind, conduit entering the FMU through holes
punched/drilled through its exterior will make it more difficult to move the FMU should it need to be
moved or relocated. When the additional height will not hinder access to the FMU, the FMU may be
mounted on two pieces of C-channel to elevate it enough for surface mount conduit to enter from
underneath.
EIU's require three conduit: one for AC power, one for EIU/Master FMU communications, and one to
carry an activation signal to the controlling device (i.e., gate, door, or carwash controller). Since the
EIU pedestal has a 3-1/2 x 3-1/2 inch conduit opening, the three conduit must exit the ground
vertically and be tied together to fit inside the Pedestal. Conduit terminating in the EIU should be cut
to a stub-off height of 24 to 30 inches and fitted with plastic insulating bushings for cable protection.
When an FMU is installed in a hazardous location, each conduit run that originates or terminates on
the service island is required by the NEC to have an approved conduit seal on each end (including
conduit routed to EIUs from a Master FMU). These seals must be installed in accordance with NEC
guidelines. In addition, sheathed cables are required to be cable sealed in accordance with NEC
guidelines.
Where flexibility is needed, approved explosion-proof flexible conduit may be used inside the
dispenser housing between the conduit seal and dispenser junction box to make conduit
connections.
Servicing Site Requirements
NOTE
Sites may be arranged with any combination of one Master FMU and up to eight Satellite FMUs
and/or EIUs. Master FMUs and Satellite FMUs can control up to eight hoses each. EIUs can control only
one ancillary equipment item (door/gate opener, car wash, etc.) each.
Servicing site equipment includes all equipment mounted on the service island and in the station
house.
NOTE
Custom applications have been developed for the FMUs to operate from 220 VAC. If such an
application is desired, Syn-Tech must be informed when the order is placed to accomplish the
necessary equipment alterations.
AC Power
FMUs and EIUs have minimum power requirements that must be met for satisfactory operation, and
should be powered from a separate power source with a dedicated circuit breaker rated no less than
15 amps. If site construction does not permit a separate FMU power source, power may be derived
from other service island equipment. When a separate power source is not used, the FMU is
susceptible to resets should the input power drop below the minimum requirement. Careful
consideration should be given to the choice of the power source to ensure FMU operation under all
operating conditions. If powered from the same circuit as equipment with high power loads (i.e.,
dispensers with, or directly powering, pump motors), input power to the FMU and/or EIU may drop
below the minimum power requirement. FMUs will shut down when input power drops below the
minimum required for operation (approximately 75 VAC), and will not resume operation until input
power is great enough (reaching approximately 95 VAC) to support normal operation.
Heater pads in the upper and lower cabinets (behind the Backplate Assembly and Pedestal I/O
Board) are thermostatically controlled to apply heat as temperatures drop. The heaters start to draw
power to generate heat and remove moisture at approximately 70 degrees F. As temperatures fall,
the heaters draw more power to generate more heat. At full output the heaters draw approximately 1
amp each for a total of 2 amps for both heaters. The other electronics in the FMU draw
219