Rixen's - Hydronic Heating Water Pump (BWO 355, 12V 3 Wire)

Overall Function

The pump is a wet rotor circulator, built according to the spherical motor principle. It is

powered by an electronically commutated permanent magnet drive (EC-motor), operated by 12VDC.

Performance

The pump operates according to the graphs shown below. Two speeds can be selected by

attaching the white PWM signal wire either to the positive or to the negative pole of the

power source:

Speed 1 (3.400 rpm, 75% Flow Rate): Attach the white PWM wire to the positive pole (as the red wire).

Speed 2 (4.400 rpm, 100& Flow Rate): Attach the white PWM wire to the negative pole (as the brown wire).

Technical Data

The following technical data apply to the pump:

Liquid: glycol/water (max. 50%/50%)

Max. delivery head H: 3.3 mWS / 10.9 ft.

Max. delivery flow Q: 17.5 l/min / 4.6 gpm (see Q/H graph, fig. 1)

Max. Power consumption: 28 W (see Q/P graph, fig. 2)

Compressive strength: PN6 (6 bar / 87.0 psi)

Speed range: 3.400 or 4.400 rpm

Safety class: IP 56

Pump housing: Noryl

Seal pump housing: EPDM 70

Motor housing: Ultramid

Motor nut: Noryl

Rotor can: Stainless Steel 1.4404

Electrical Connection

A power cable is factory fitted to the pump. The cable resists a temperature of 105°C.

Cable type: 3x1mm2, UL approved.

Cable length: 700mm

The cable ends are stripped and unprepared (without cable end sleeves).

Lead colors are red (+), brown (-) and white (PWM-signal).

The pump is protected by an in-built 3.15 A time lag fuse!

Pump Protection

INFO! The pump feature dry run protection is deactivated! The pump will not stop

running even if used in plain air. However, the pipe system should be bled completely

in order to prevent pump damages.

INFO! The pump is equipped with blocking protection. If commutation gets lost (e.g. due to

blocking of rotor) the pump switches off automatically, starts again, eventually switches off

again and so forth.

INFO! Speed limitation at low temperatures: At a medium temperature <10° C (cold system)

the pump runs at a limited speed of 2.300 rpm in order to maintain circulation. If the medium

temperature rises to over 10° C the pump works in the usual way according to the speed set.

INFO! The pump is equipped with overheating protection. If 125° C is exceeded in the motor,

the pump will switch completely off. It switches on again, when the temperature falls below

105°C.

Operational Conditions

On site ambient temperature: -20°C ... +50°C

Temperature of medium: -20°C ... +90°C*

*Above 85°C the motor will reduce its speed so that overheating is avoided, whereas heat

flow through circulation is still given. If the temperature reaches the standard range again,