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or PEX) tubing, a flexible connector hose is
strongly recommended for the pressure side.
If the Flowmaster pump is mounted at a dif-
ferent location than the old pump, flexible
connector hoses will be required on both the
inlet and outlet side. A screen filter should
always be used between the boat water tank
and the pump.
Typical applications
The Flow Master 5.0 is a five chamber posi-
tive displacement diaphragm pump that is
an ideal choice for pressurizing water in a
closed system such as that found in a boat
or Recreational Vehicle (RV). The digital con-
troller adjusts water flow as the demand is
increased and decreased while maintaining
a very smooth flow. The unique variable flow
feature of the Flow Master pump al-lows the
pump to be mounted without an accumulator
tank and still maintain an even flow regard-
less if one or multiple taps are being used.
Features
• Variable speed
• Quiet operation
• Smooth flowing
• Self priming
• Digital controller turns pump on and off
automatically when tap is opened and
closed
• Dry running without damage
• Low power consumption
• Quick disconnect fittings
Working principle
When water is demanded (at the faucet,
shower etc.) the pressure decreases. After a
slight drop in pressure (below 50 psi) the in-
tegrated digital controller automatically soft
starts the pump on to maintain the required
pressure. As more water is demanded the
controller detects a drop in pressure and
automatically increases the motor speed,
increasing the flow volume. As demand is
reduced the digital control reduces motor
speed until the pressure reaches 50 psi at
which point the pump is automatically turned
off.
Due to their durable construction and
thoughtful design, the Flow Master 5.0 pro-
10
vides many years of service.
Important! The pressure setting of this
pump is made at the factory. Warranty is in-
validated by pressure switch interference.
Technical description
Body:
Nylon/Polypropylene
Valve Housing:Polypropylene
Valves:
Santoprene/EPDM
Diaphragm: Santoprene
Connection:
3/8" BSP, ½" hose
(ø 13 mm) and ½" BSP,
¾" hose (ø 18 mm)
US 3/8" NPT, ½" hose
(ø 13 mm)
US ½" NPT, ¾" hose
(ø 18 mm)
US ½" – 14 NPS
½" CTS PEX fitting
Max. Liquid
temperature:
Max +50°C/+120°F
Fasteners: Stainless Steel
Max.
Suction lift: 2.5 m/8.2 FT.
Turn off
pressure:
3.45 bar/50 PSI
Duty cycle: Intermittent, Max 20 min.
Motor:
WPS 5.0 – 150 W
12 or 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).
Installation and maintenance
Installation
Locate the pump in a dry location. If the
pump is mounted vertically, the motor shall
face up.
Mark screw positions and drill pilot holes.
Mount the pump using stainless steel screws
taking care not to over compress the vibra-
tion damping rubber feet.
Reinforced, high pressure flexible tubing is
recommended. If rigid pipe is used, a length
(225 mm/9 inches minimum), 36" on each
side [Inlet-Outlet] of flexible tubing shall be
installed between the pump and the rigid
pipe. This will address noise and/or dam-
Original instructions
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