Junqi 24V 300W High Head 17.5m Coolant Water Pump, with PWM control and Fault feedback

■ Applications
Widely used in hybrid bus, hybrid passenger car, electric vehicles, trains, ships and other heating and cooling circulation system.

■ Features
◆ Centrifugal pump
◆ Magnetic force transmission
◆ High efficiency brushless DC motor, low power consumption, high efficiency, long service life.
◆ With wide range operating temperature
◆ PWM signal speed controlling(optional)
◆ Diagnostic signal output(optional)
◆ With constant flow controlling
◆ Reverse polarity protection
◆ Dry running protection
◆ Over Voltage, over current protection
◆ Overload, over temperature protection

■ Technical description (related parts in contact with the liquid)
Pump head housing: Aluminum alloy
Impeller: PPS+GF
Shield cavity: PPS+GF
Shaft sleeve: carborundum composite materials
Shaft: stainless steel(3CR14) shaft
Magnet housing: PPS plastic capsulation
Seal ring: EPDM



■ Mounting instruction
OWP-BL43-428D series pumps are centrifugal pumps which require pre-filled,
The pump installed in the lowest position of the system to ensure that the impeller is always immersed in the liquid, or pre-filled the pump before power on .

1: Pump should not be dry-running, even though it can dry-running for 15 minutes (after 15 minutes dry-running, it will automatically stop), Dry running will makes noise, also increasing abrasion to the shaft and shaft sleeve.

2: Use the recommended diameter pipe connecting the pump inlet, if you use a smaller diameter hose pump inlet, Due to the negative pressure in the pump, the outside air easier enter to the pump through the pipeline, it will make the pump performance degradation, and also the air bubbles make damage to the pump.

3: As viewed from the pump inlet direction, the impeller rotates clockwise (see the arrow on the outlet port).

4: The pump can be installed vertically or horizontally mounted (see figure 1 ) When installed vertically, the outlet port should be upward .

5: In order to avoid the dry- running (air get stuck in impeller),the water pump outlet port should be vertical or in the upper of the impeller. (see figure 1 )

6: The connected pipe should be vertically mounted (or no elbow in 20cm )to make the air discharged easily, the outlet pipe should not be used less than 90 degrees elbow (see figure 2).

7: Can't use the seawater or other heavy pollution with big grain impurity liquid as the liquid medium .


■ Temperature parameter
Medium liquid temperature: -40℃ to +85℃ (-40°F to + 185°F)
Working ambient temperature: -40℃ to +120℃ (-40°F to +248°F)
Storage temperature: -40℃ to +70℃ (-40°F to +158°F)
(up to 100 ℃, but it will shorten the service life)

Medium liquid: liquid mixture (Water with below 60% glycol)


■ Electrical parameter

■ Pummp connector Descriptions:

■ PWM control Chart:

■ Fault feedback chart:

■ Performance Curve:

• External dimension