VMV - Versatile Modular Booster Set with Up to 8 Pumps
WRAS approved, high performance modular variable speed booster sets available in thousands of configurations, with up to 8 pumps.
Possible cause(s) | Recommended action |
Minimum pressure requirement not reached within set period when filling system for the first time |
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Possible cause(s) | Recommended action |
No electrical power | Check and rectify |
Blown fuse | Check and rectify |
Overload trip | Check and (if necessary) reset the overload trip value. |
Possible cause(s) | Recommended action |
The rotating part(s) of the pump is/are partially or completely obstructed e.g: impeller obstructed by foreign matter |
Strip the pump to inspect and rectify |
Pump not primed - WARNING: running the pump ‘dry’ can cause serious damage to the mechanical seal. |
Having first checked the mechanical seal for damage, prime and air-bleed the pump and try again |
Valve in suction pipework closed or partially closed. |
Check all appropriate valves are fully open. |
Incorrect pump rotation |
Check and rectify. |
Possible cause(s) | Recommended action |
Pump is cavitating |
Increase the discharge back pressure slightly by progressively closing a manual isolating valve on the discharge side until the cavitation stops. |
Motor bearings worn
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Check and rectify |
The rotating part(s) of the pump is(are) partially or completely obstructed. e.g: impeller obstructed by foreign matter. |
Strip the pump to inspect and rectify |
Possible cause(s) | Recommended action |
If the pump has a “Hand Control” option on it’s control panel. |
Switching to “Auto” should restore normal control. |
Pump has no “Hand Control” option.
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An immediate service visit is required. |
Possible cause(s) | Recommended action |
Pipework or the pump chamber has a partial blockage. |
Check and rectify |
Momentary loss of one phase of power supply. |
Check and try again. |
Discharge flow rate too high. |
Reduce by the discharge flow rate by increasing the discharge back pressure slightly, progressively closing a manual isolating valve on the discharge side: then try again |
Overload trip setting too low for rated duty |
Check and (if necessary) reset the overload trip value |
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