Installation manual
FuelMaster
®
Installation Manual
53
Controlling Lube Bay Hose Reels: control of lube bay hose reels is very similar to the control of
other types of dispensing equipment with the exception of the power source. Equipment designed for
controlling lube bay hose reels is typically 12 or 24 VDC, and an added power supply may be necessary
to power the equipment. A DC power supply may be installed in the FMU to minimize the number of wires
needed to control each hose reel.
Each hose reel will require a solenoid valve and pulser or flowmeter. Depending upon the product in the
hose reel, the valve and pulser may be designed to match the product. Antifreeze and motor oil generally
require two different types of solenoid valves and pulsers. Grease requires equipment which can
withstand high pressures, and is much more costly than similar equipment for lower viscosity liquids.
If mixed voltages (110 VAC and 12 VDC) are being used in the same FMU, the use of dual control relay
assemblies is recommended. They can control any voltage type where solid state relay assemblies must
be equipped with different relays when controlling DC voltages.
Some manufacturers who supply equipment to control hose reels are Alemite, Balcrank, Graco, and
Lincoln. Its recommended this equipment be sourced from a local distributor who can also install it. Quite
possibly the company who installed the hose reels will have a solution for the parts necessary to
automate the hose reels.
RC Networks (Snubbers/Spark Quenchers)
There are wiring situations which may provide the FMU false indications of pump handle detection. RC
networks may be used to remove these false indications. RC networks are a small cube shaped device
with two wires leading into it.
Most of these false indications occur with the use of solid state relays in the FMU. Solid state relays
restrict the flow of power in the normal direction, from LN to LD, but allow it in the reverse direction, from
LD to LN. When power is being fed to LD it will pass through a solid state relay to LN. These problems
don’t occur when using dual control relay assemblies.
When solid state relays are used in the FMU, and the dispenser is also using solid state relays to activate
solenoid valves or pump motors, voltage feedback to LD may occur after a transaction is completed. This
voltage will pass through the FMU solid state relays from LD to LN resulting in a false indication of pump
handle detection. This voltage can be detected by measuring the voltage at both LD and LN. If the
voltage is greater at LD than LN, then the voltage is feedback from the dispenser. Common occurrences
are with Gasboy 9800 series dispensers being controlled by solid state relays in the FMU. A 0.2
microfarad RC network installed between LD and neutral will remove the false indication. The RC network
should be installed as close to the controlled device (solenoid valve or suction pump motor) as possible.
A common source for a 0.2 microfarad RC network is Okaya part number XEB1202. Retail price is
approximately $1.70.
Similar problems may occur when directly controlling 230 VAC suction pump motors. A 230 VAC pump
motor requires two inputs of 115 VAC each. Some dispenser installation manuals depict one input being
a constant 115 VAC from a circuit breaker, and the other input controlled by the dispenser reset
mechanism. Problems arise when the input from the FMU is not being applied. The other 115 VAC input
from the circuit breaker passes through the coil windings of the pump motor and feeds back to the FMU
LD position. This situation also provides a false indication of pump handle detection, but with a higher
current input. Voltage comes into LD and feeds through the solid state relay to LN. The false indication is
removed by installing a 1.0 microfarad RC network between LD and neutral, as close to the motor as
possible. A common source for a 1.0 microfarad RC network is Okaya part number XEB01010. Retail
price is approximately $4.25 each.
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