Johnson Pump WD 5.2 - Product Overview and Technical Details; Working Principle

8
Original instructions
> English
Typical applications
TheWDpumpsarevechamberpositive
displacement diaphragm pumps.
 Thesepumpsaretheidealchoicefor
wash down applications as they provide
2.8 bar pressure (WD 2.9) or 5 bar/ 70psi
pressure (WD 3.5 and WD 5.2), making
clean-up faster and easier.
Features
• Quietoperation
• Smoothowing
• Selfpriming
• Integratedpressureswitchturnspump
on and off automatically when the
spray nozzle is opened and closed
• Dryrunningwithoutdamage
• Lowpowerconsumption
• Quickdisconnectttings
Working principle
As the pump runs, pressure is increased
until it reaches the pre-defined pressure
level, see page 40. When the pre-defined
pressure level is reached 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 the pres-
sure 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 WD-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.
Wash Down Systems WD 2.9, WD 3.5 and WD 5.2
mounted to DC motor 12/24 V
Technical description
Body: Nylon/Polyamide
Valve housing: Polypropylene/Polya-
mide
Valves: Nitrile
Diaphragm: Santoprene
Connection: 3/8" BSP, 1/2" hose
(Ø 13 mm) or
 US:1/2"NPT,3/4"hose
(Ø 13 mm) 3/4" Garden
 hosethread(GHT)
Max. liquid
temperature: Max +50°C/+120°F
Fasteners: Stainless steel
Max. suction lift: WD 2.9 2 m/
WD 3.5 – 2.5 m/8.2 ft
WD 5.2 – 3 m/9.8 ft
Cut in pressure: See page 40
Cut-off pressure: See page 40
Duty cycle: Intermittent, max 20 min
Motor: WD 2.9 – 85 W
WD 3.5 – 120 W
WD 5.2 – 185 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 40