PTC HPP CLW HT Serie Instrucciones Para El Ensamblaje Y Mantenimiento página 21

CAUTION
• The temperature of the water supply is a crucial factor for the life and performance of the pump.
When using with water with higher temperature than the maximum value (for short periods only), please contact
the Manufacturer's Technical Assistance Service.
• A suitably-sized filtration system has to be provided at the pump inlet with the following characteristics:
- filtering power between 100-320 microns;
- filter capacity three times greater than max pump flow rate;
- diameters of filter inlet and outlet mouths the same or greater than those of pump suction.
• During pump suction, avoid blockages, counterslopes and overturned U curves. Make sure the system is such as
to prevent emptying the suction pipes when the pump is stopped (also see Fig. 2).
• The suction and delivery pipes must not convey excessive forces or torques to the pump.
• The suction pipes must have an inner diameter the same or greater than that of pump suction, a nominal pressure
of 10 bar/145 psi and must be strong enough to prevent any crushing caused by any suction vacuum.
• The suction pipes must have a nominal pressure of not less than the maximum pressure of the pump.
• To cushion vibrations and irregular flow, we recommend to fit:
- a pressure accumulator (or a flexible delivery hose at least 1.5 m/5 ft long) between the pump delivery coupling
and the pressure unloader/regulation valve;
- a flexible delivery hose at least 1.5 m/5 ft long downstream of the pressure unloader/regulation valve;
- a flexible suction hose at least 1.5 m/5 ft long upstream of the pump suction connection.
• The pump needs to be supplied through a booster pump, prepare the system so that:
- the booster pump has at least twice the flow rate of the positive displacement pump;
- the booster pump's operation is independent of the positive displacement pump;
- the booster pump always starts before the positive displacement pump;
- a pressure switch is fitted on the suction line downstream of the filter to protect the positive-displacement
pump from any lack of water due to filter blockage;
- a pressure gauge for viewing the supply pressure is provided near the booster pump.
Suction and delivery connections are available both on the right and left sides of the head.
EN
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