Some of the services Filpumps can offer are listed below, please click the relevant one for further information:
Frequently Asked Questions & Basic Procedures
In an effort to deal with common issues our customers come up against, we have compiled basic information below to help overcome some of the more common problems encountered. Please click on the one relevant to your issue:
My water is surging, going fast then slow, then fast, etc what can I do?
My pump is hunting - ie pump is switching on/off too frequently
For Water Pressure Surging or Pumps Hunting On/Off, it could be that the starting pressure of your pump or your pressure switch may need adjusted, or it may be that the Non-Return Valve on your pump suction line is leaking.
Expansion Vessel Precharge Settings
The precharge pressure of expansion tanks must be set to 0.3 bar less than the starting pressure of the pump.
Example:
To ensure correct maintenance:
The air pressure may be checked using a good quality type pressure gauge on the Schraeder Valve fitted to the top of the expansion vessel, or in the case of horizontal vessels the Schraeder Valve will be fitted to one end.
Check the air precharge pressure of the expansion tank at least every 4 months, with the pump switched off and a tap opened to ensure that the water pressure reading on the gauge is zero bar.
If the pump is used more often this can be established by checking the pressure after a shorter period of time, and if no addition air charge is required, then the frequency may be extended.
Pressure Switch Settings
There are several types of pressure switches used on pressure sets. They may look like this:
Instructions for Adjusting the Pressure Switch
The automatic pressure switch models are provided with a factory setting that is sufficient for most applications and requirements. To set the pressure switch to meet your specific requirement follow the instructions below for the model of pressure switch purchased.
Establish Required Pressure Settings
• Depending on the exact application, and taking into account the static head of the system, decide on the minimum pressure required to start/operate the pump (cut-in pressure).
• Set the expansion vessel precharge pressure to 0.3 bar less than the cut-in pressure. This procedure must be carried out with the pump switched off and the water pressure gauge at zero bar.
• Identify the make of pressure switch supplied with the pump.
Square D (Fixed Differential Pressure Type):
• Turn the nut A clockwise to increase the cut-in pressure or anti-clockwise to decrease the cut-in pressure. This will automatically change the pump stop (or cut-out) pressure as the differential pressure between the two cannot be adjusted.
Telemecanique / Square D - Telemecanique / Italtecnica:
• Turn the nut A clockwise to increase the cut-out pressure or anti-clockwise to decrease the cut-out pressure.
• Turn the nut B clockwise to increase the differential pressure between the cut-in and cut-out pressure. Turn the nut B anti-clockwise to decrease the differential pressure between the cut-in and cut-out pressure.
The pressure switch is supplied with a 1.38 bar (20 psi) differential which will be appropriate for most applications.