Installing Rc Networks; Connecting Suction Pump Motor Power For Suction Pump Systems - Bennett 3700 Series Installation Manual

An RC Network is an electrical noise suppression device (see figure 37). It is used on AC power devic-
es such as coils and across relay contacts (see figure 38). When AC voltage is applied to coils they are
converted to electromagnets. Coils are used to operate AC devices, such as solenoid dispensing valves
and AC power relays or contactors. When the AC power is removed from a coil, the electromagnetic
field collapses. This causes an AC voltage spike as high as 1500 VAC which can affect electronic sys-
tems.
Figure 37 - An RC Network
Follow this procedure to protect dispenser and console operation:
Install an RC Network in the Control Relay Box across the following:
Connecting Suction Pump Motor Power
for Suction (Self Contained) Pump Dispensers
Self-contained dispensers have the pump motor mounted in the lower hydraulic area. The power is
passed to the pump motor using the pump motor relay located on the CPU board in the electronic
enclosure. Use 14-gauge stranded THHN wire minimum for the suction pump motor wires for runs
under 50ft. 12Ga. for runs to 100ft, 10ga.for runs over 100ft, and 8 ga. for runs over 200 feet. Pump
motor power must be on a different phase leg than the dispenser power or system malfunction
will result and the Bennett Limited Warranty will be voided.
Termination of Field Wiring for Pump Motor Power of Self-Contained Dispensers
Note: Wire termination for 3-phase Motor Connections for 3000 series self-contained pumps with 210
or 531 electronics will be terminated directly to a 3-phase contactor relay or terminated to a
contactor board as shown in Figure 39.

Installing RC Networks

For Submerged Pump Systems
Across Coil to Neutral
Across M1 to L1
Across M2 to L2
Figure 39 - Contactor Board
46
Figure 38 - RC Networks
installed in control relay box.
120001 Rev K 1-19-18