INSTALLATION
MOUNTING
Dual Sensor Max VSD system is self-priming and may be located
up to 5 feet (1.5m) above the fresh water tank in a dry location.
Note: vertical prime can vary depending on the fluid viscosity,
suction tube size, use of a foot valve, and pump configuration.
If mounted inside an enclosure, provide adequate ventilation for
cooling.
Install four rubber grommets in pump bracket mounting holes.
The Dual Sensor Max VSD bracket is designed to mount on a
flat surface with four mounting screws of adequate size. Do not
mount to a vertical surface. Excessive strain caused by vertical
mounting may cause failure of the mounting bracket. Do not
over tighten mounting screws. Rubber grommets act as shock
absorbers. Tighten mounting screws until rubber grommets
are partially compressed. Over-tightening can cause excessive
noise and vibration in the plumbing system.
PLUMBING
Use flexible hose and plastic fittings of correct pressure rating
and compatible with the fluid being pumped. Tubing should be
a minimum of 3/4” (19 mm) inside diameter to provide free flow
and be secured with stainless steel clamps at each fitting. Do
not connect pumps directly to rigid pipe. Rigid pipe will amplify
pump noise and may fatigue and break plastic inlet and outlet
fittings causing pump to leak. Periodically clean PUMPGUARD
strainers. Avoid kinks in flexible plumbing.
WIRING
Consult the WIRING DIAGRAM for proper circuit connection.
The Dual Sensor Max VSD should be wired to the power
supply through a switch rated for 25 amps. An inline fuse is
factory installed in each pump to provide over current
protection to each pump. The pump circuit should not include
any other electical loads. Red wire is positive. Black wire is
negative. Turn the system off when not in use for extended
periods or when supply tank is empty.
IMPORTANT VSD electronics require that a battery be
installed in the DC power supply when using an AC to DC
converter or battery charging system. Electrical noise from
the converter or battery charging system can interfere with
proper operation of the VSD circuit unless a battery is present
in the DC power supply as shown in the WIRING DIAGRAM.
IMPORTANT Polarity of electrical connections is very impor-
tant. Insure that the RED (+) motor lead is connected to a
fused positive DC circuit. The BLACK (-) motor lead must be
connected to the negative DC circuit. In the event the polarity
is reversed on the VSD pump, the fuse found in the ‘EMI Filter
Box’ built into the VSD power wire leads must be replaced.
IMPORTANT This system should be installed by a qualified
electrician or someone familiar with applicable electrical and
safety standards.
Use wire size according to the chart below. Total wire length
refers to the distance from the DC power source to the pump
and back to the power source. This chart provides for a maxi-
mum 3% voltage drop.
WIRE SIZE TABLE
Total wire
0-20 ft
20-30 ft
30-40 ft
40-60 ft
length
(0-6 m)
(6-9 m)
(9-12 m)
(12-18 m)
Wire
#10 AWG
#8 AWG
#6 AWG
#4 AWG
Size
(6 mm2)
(10 mm2)
(16 mm2)
(25 mm2)
Motor case will get hot during extended
operation. Prolonged contact with skin
may cause a burn.
PRE-OPERATION CHECKS
The supply tank should be at least half full prior to initial opera-
tion. Insure all plumbing connections are secure. Insure flexible
tubing is not kinked. Insure all electrical connections are secure
and in accordance with the WIRING DIAGRAM. Open all hot
and cold water faucets and fixtures. Insure that water heater
circuit is off.
WARNING
!
Explosion hazard. Do not pump gasoline, solvents,
thinners or other flammable liquids. To do so can
cause an explosion resulting in injury or death.
FLEXIBLE
HOSE
RIGID
PIPE
WARNING
!
Fire hazard. Wiring must comply with
applicable electrical standards and include
a properly sized fuse or circuit breaker.
.
Improper wiring can cause a fire resulting
in injury or death.
Tank
Vent
Water
Tank
Tank
Fill
Faucet
Faucet
Shower
Dual Sensor
Max VSD
Check
Valve
Water
Heater
Hot Water
Line
Red (+)
(+)
On/Off
Switch
EMI
Filter Box
DC Battery
(–)
Black (–)
Inline
Fuse
TYPICAL PLUMBING SYSTEM
WIRING DIAGRAM
When using a power supply or
converter, a battery must be in the
circuit for proper operation.
NOTICE
