HPP EF 111/210 (1000 об/мин) [25/108] Operation at a temperature above max value

HPP EF 111/210 (1000 об/мин) [25/108] Operation at a temperature above max value
25
CAUTION
The temperature of the water supply is a crucial factor for the life and performance of the pump.
To use water at temperatures above 40 °C/104 °F, follow the instructions in the following paragraph Operation
at a temperature above max value.
During suction, the pump must be tted with an adequately sized lter.
The ltering system must have the following characteristics:
- ltering power between 100-320 microns;
- lter capacity three times greater than max pump ow rate;
- diameters of lter 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. 5).
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 ow, we recommend to t:
- a pressure accumulator (or a exible delivery hose at least 1.5 m/5 ft long) between the pump delivery coupling
and the pressure unloader/regulation valve;
- a exible delivery hose at least 1.5 m/5 ft long downstream of the pressure unloader/regulation valve;
- a exible suction hose at least 1.5 m/5 ft long upstream of the pump suction connection.
In case of supply by means of a centrifugal pump, prepare the system so that:
- the centrifugal pump has a ow rate at least double that of the positive-displacement pump;
- centrifugal pump operation is separate from that of the positive-displacement pump;
- the start of the centrifugal pump always precedes that of the positive-displacement pump;
- a pressure switch is tted on the suction line downstream of the lter to protect the positive-displacement
pump from any lack of water due to lter blockage;
- a pressure gauge is tted to monitor the supply pressure close to the centrifugal pump.
Suction and delivery connections are available both on the right and left sides of the head.
OPERATION AT A TEMPERATURE ABOVE MAX VALUE
CAUTION
To use water at a temperature above max value (for short periods only and in any case within the limit of
60°C/140°F), follow these installation rules:
- supply the piston pump with a centrifugal pump having double the ow rate and a max pressure of 3bar/43.5psi;
- if the centrifugal pump is not used, reduce the rotation speed to 500 RPM;
- always be careful to comply with the direction of rotation.
For applications at temperatures above 60 °C/140 °F, contact the Manufacturer’s After-Sales service.
SPECIAL MAINTENANCE
Keep to the schedule shown on the following table:
MAINTENANCE SCHEDULE JOB
First 50 hours. It is best to change the oil.
Every 500 hours. Check the tightness of the pump screws
(1)
.
Check oil level
(2)
.
• Check the pressure unloader/regulation valve and the pressure relief valve.
Every 1000 hours. Check the tightness of the pump screws
(1)
.
Oil change
(2)
.
Check/replace oil seal rings
(3)
.
Check/replace whole seal pack.
Check/replace suction/delivery valves.
Check/replace pumping unit.
(1)
Checks should be made more frequently if the pump operates where there are strong vibrations.
(2) The oil should be replaced at least once a year.
(3)
The oil seal rings are best replaced at least once every three years.
EN

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