HPP CH 25/500 (1450 об/мин) [17/76] Operation at a temperature above max value
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HPP CH 25/500 (1450 об/мин) [17/76] Operation at a temperature above max value

HPP CH 18/500 (1000 об/мин) [17/76] Operation at a temperature above max value
17
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. 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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.
CAUTION
• Theusedoilandreplacedcomponentpartsmustbecorrectlydisposedofandnotdiscardedintheenvironment.
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