Noise Level; Frequently Asked Questions - Walrus Pump Co., Ltd. HQ Series Instruction Manual

5. The pump should not be used to transfer toxic or contaminated liquids. Please carefully follow
all instructions in the manual as Walrus may refuse to accept the contaminated pump for servic-
ing.
6. If the supply cord is damaged, it must be replaced by a special cord or assembly available from
the manufacturer or its service agent.
7.Please cut off the power supply if there is lack of water supply or pump is not use for a long
period.
X. Noise level
The noise level of the pump is less than 70dB(A) of sound pressure level according to ISO 3746,
the uncertainty is 4dB(A).
XI. Frequently asked questions:
1. What causes the HQ to start?
The HQ has the built-in pressure switch and internal flow switch. Each of these can turn the pump
on depending on water consumption. The pump will start when:
- The pressure is BELOW the pressure switch activation point. OR
- The flow rate is greater than 3.0-3.5 lpm.
The preset activation point for each model is provided in the pump specifications. The cut in
pressure must be lower than the preset activation pump; otherwise the pump will not start.
2. What is the maximum pressure switch activation point?
Adjust the pressure only when the cut in pressure is higher than the preset activation point. Do not
adjust the pressure to exceed the maximum pressure range as below because too high pressure
may cause the pump not stop:
Model 50Hz
HQ200 1.6 Kg/cm²
HQ400 2.0 Kg/cm²
HQ800 2.0 Kg/cm²
HQ800H -
3. What causes the HQ to stop?
- The flow switch is designed to automatically stop the pump when water flow drops below
3.0-3.5L/min.
- Pump will shut off in a few seconds after flow stops (It is programmed to stop after 6
seconds). To avoid dry run without liquids, It will automatically stop after 1 minute. Pump will
automatically rest for 10 minutes and restart again. If above cycling happened accumulate 3
times, the rest time will become 1 hour and restart again. If the water is enough for pump to
restart during the 1 hour rest time, it will automatically start again after the rest time. For
immediately start the pump, please turn the power off for at least 6 seconds and turn on
again.
- Water temperature protection will activate when it is over 50℃, and pump will automatically
stop. It will reactivate when temperature drops to 35℃.
- Motor protection for HQ200 and HQ400 will activate when temperature is over 130℃.
Motor protection for HQ800 will activate when temperature is over 150℃. Pump will
automatically stop.
60Hz
1.6 Kg/cm²
1.8 Kg/cm²
2.0 Kg/cm²
2.5 Kg/cm²
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