Xylem O&M Mini V Series Variable Speed - Manual (Page 5)

Caution
This booster set is an automatic machine; the pumps may start up automatically without
prior warning.
The set contains pressurised water; reduce the pressure to zero before servicing.
Maintenance
Routine check (6 monthly intervals)
1. Check all pumps produces the correct pressure.
2. Check that the pump operates without undue noise or vibration.
3. Check the break tank/s are clean and that the correct water level has been maintained.
4. Check that all screws are tight on electrical components.
5. Check that the earth connections are tight and making good contact.
6. Check that the gas pre charge is at the correct pressure, this should be done by isolating the vessel from
the system and draining water out of the vessel via the isolation valve drain point.
Once the water has been discharged, a tyre gauge can be connected to the pre charge valve to display the
vessel pre charge pressure. Recharge as necessary with Nitrogen or dry air.
Any other expansion vessels connected to the system can be checked in the same manner.
Clean any filters that may be connected to suction/discharge lines and ensure the mesh is in good condition.
General fault finding guide
5
Fault Possible Cause Remedy
Pump fails to start
Power supply failure
Control panel fuse blown,
MCB tripped
Remote inhibit active
Low water level Reinstate incoming power supply
Replace power supply fuse
Reset MCB
Turn remote inhibit off
Reinstate water supply
Pump fails to stop
Set point set too high
System pressure low due to
large leak
Lower set point
Switch unit off until leak is repaired
Pump switches on and off
quickly Air in system
Vessel pre-charge incorrect
Purge air from pumps and pipework
Check vessel pre-charge and Charge as
necessary with Nitrogen or dry air
Pump runs but will not make
pressure
Pump air locked
Non-return valve jammed
Passing too much water Open pump bleed screw and vent pump
Clean/replace valve
Check system for leaks
Pump overheating Pump partially seized
Remove pump and check for foreign
objects
Pump set frequently
starting. (pressure falls to
cut in point)
Newly installed system with
large amount of air in pipe work
Leaks in system pipe work
Vessel pre-charge incorrect Bleed system to remove air
Repair leaks
Isolate vessel and pre-charge with
Nitrogenas appropriate
Break tank overflowing
Leaking ball valve
Non-return valve letting by Replace ball valve seal
Replace/clean non-return valve
Pump leaks water
Defective mechanical seal
Undue mechanical stress on
pump
Replace seal
Support the pipe work
mini V booster set o and m instructions:Layout 1 11/05/2012 15:20 Page 5