Working Principle; Technical Description; Type Designation - SPX JOHNSON PUMP Manual De Instrucciones

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Water Pressure Systems 3.4 and 5.0 mounted to
DC motor 12/24 V
Typical applications
The WPS 3.4 and the WPS 5.0 are
both five chamber positive displacement
diaphragm pumps.
These pumps are the ideal choice for
pressurizing water in a closed system
such as that found in a boat or in a recrea-
tional vehicle.
They can easily build the pressure requi-
red for a pressurized water supply system.
Features
• Quiet operation
• Smooth flowing
• Self priming
• Integrated pressure switch turns pump
on and off automatically when tap is
opened and closed
• Dry running without damage
• Low power consumption
• Quick disconnect fittings

Working principle

As the pump runs, pressure builds until
reaching 2.8 bar/41 psi. At this point, the
integrated pressure switch automatically
shuts the pump off.
The pump is equipped with positively
checking outlet valves which ensure that
the pressure is maintained after the pump
shuts off.
When water is demanded (at the faucet,
shower et.c.) the pressure decreases.
After a moderate drop in pressure, the
integrated pressure switch automatically
turns the pump back on.
Due to their durable construction and
thoughtful design, the WPS 3.4 and the
WPS 5.0 pumps will provide many years
of service.
Important! The pressure setting of this
pump is made at the factory. Warranty
invalidated by pressure switch inter-
ference.
8

Technical description

Body: Nylon/Polypropylene
Valve housing: Polypropylene
Valves: Santoprene/EPDM
Diaphragm: Santoprene
Connection: 3/8" BSP, 1/2" hose
(ø 13 mm) and
1/2" BSP, 3/4" hose
(ø 18 mm) or
US 3/8" NPT, 1/2"
hose (ø 13 mm) and
US 1/2" NPT, 3/4"
hose (ø 18 mm)
Max. liquid
temperature: Max +50°C/+120°F
Fasteners: Stainless steel
Max. suction lift: WPS 3.4 – 2 m/6.5 ft
WPS 5.0 – 2.5 m/8.2 ft
Cut in pressure: 1.7 Bar/25 psi
Cut-off pressure: 2.8 Bar/41 psi
(Other pressure settings see page 39)
Duty cycle: Intermittent,
max 20 min
Motor: WPS 3.4 – 100 W
WPS 5.0 – 150 W
12/24 V DC
with built in thermal
protection
The motor is ignition protected according
to ISO 8846 (Small craft
– Electrical devices – Protection against
ignition of surrounding flammable gases).

Type designation

(See page 39)
Original instructions