Walrus Pump TQ Series, Инструкция по эксплуатации, Страница: 10 / 16

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XII. Frequently asked questions:
1. What causes the TQ to start?
The TQ 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 0.7 GPM.
The preset activation point for each model is provided in the pump specifications.
2. What causes the TQ to stop?
The flow switch is designed to automatically stop the TQ pump when flow drops to below
0.7 GPM. The pump will shut off in a few seconds after flow stops (TQ1500-3700 is
programmed to stop after 15 seconds). In addition, the TQ will be turned off in the event
of dry-run or over temperature alarm.
3. What is the purpose of the built-in pressure tank?
The pressure tank comes from the factory pressurized at approximately 43 psi (with the
pump pressure at zero). It is designed to minimize motor startup due to small flow
demand or minor leak of the pipeline.
4. How is the dry-run condition determined and the protection provided?
The dry-run is defined when the motor is running AND the flow rate is less than 0.3 GPM
AND when pressure is less than the pressure switch setting. The protection is provided:
When the pump is run dry 2 minutes, it will automatically shut off for 10 minutes and
then attempts to restart. When all 3 attempts are failed, the pump will rest for 1 hour
and then attempts to restart. This protection mode will be repeated until the water
supply is back to normal.
In case the pump is cycling (on-and-off repeatedly) due to small flow (less than
0.3GPM), air pocket in the system, air loss in the pressure tank or leak in the pipeline,
the protection is provided:
The pump will run for 8 seconds and stop for about 3 seconds. When the cycling mode
repeat for 15 times consecutively, the pump will be rest for 1 hour. Then it will start over
the protection mode until the problem is corrected.
Note: The pump can be reset anytime by removing the power plug.
5. What is the maximum inlet pressure allowed in the TQ?
The maximum internal system pressure allowed for TQ is 120 psi. The maximum inlet
pressure when added to the TQ pressure must not exceed 120 psi.
Additionally, if inlet pressures exceed the built-in pressure switch activation point (43
psi factory default), the pressure switch will be unable to function, and the ability to turn
the TQ on at low flow rates will be lost. In this situation, only the flow switch will be able
to turn the TQ on at flow rates above 0.7 GPM.