QT Technologies LLC
QT Technologies LLC (303) 444-3590 FAX (303) 444-8736 Page 7
Wiring Requirements - Option B
An area of variation from site to site is the
pump actuation circuitry. In general, it is
necessary to wire the pump motor(s)
through a relay so that the current draw
required by the pump motor(s) does not
pass through the DPI board (see Figure
8). The relay(s) can be located just about
anywhere it is convenient (Electrical Ser-
vice Panel or pedestal, for example) and
the pump actuation wires can be routed
directly to the pump or share conduit with
the rest of the high voltage wires.
Typically, your conduit and wiring layout
will look like either "Option A" or "Option B"
depicted in (Figure 5 & 6). Use them as a
starting point to map out your actual wiring
requirements. Keep in mind, these are rec-
ommendations only. You are responsible
for Electrical Code compliance. It is
strongly recommended you consult and/or
contract with a qualified electrician as you
proceed with this work.
Note: When setting up electric hose reels, con-
sider routing the hose reel circuit through the NC
side of the pump relay so that while the pump is
running, the hose reel is "dead" and thus presents
no safety hazard.
Figure 6—Dispenser Field Wiring—Option B
Tank
Terminal
Dispenser
Telephone
Company
Power
Circuit
Breaker
Panel
NOTE: This diagram is for a single dispenser setup. For more than one
dispenser, add additional B, C & E conduits for each additional dispenser.
Rigid
Conduit
A
B
C
D
E
Size
1/2"
3/4"
1/2"
3/4"
3/4"
Description of wires inside conduit
Low voltage for pulser wires*
High voltage for reset, clear, slow & fast valves
Low voltage for telephone wire
High voltage for terminal and dispenser power
High voltage pump control wiring
IMPORTANT NOTES:
Stranded wire only
Each pump motor must be actuated through 30 amp relays.
This applies to 120V and 240V motors.
If you deviate from these requirements, please call QT
Technologies at (303) 444-3590.
*The low voltage conductors (A) maybe placed in the high
voltage conduit (B) as long as they are in a shielded cable.
A
B
C
D
E
Pump
Relay
Suction Pump Wiring
Submersible Pump Wiring
Fuel Line
Dispenser Field Wiring Diagram - Option B
Pump Control Relay located in Pedestal
