TONY BROOKS

‘If your wa­ter pump used to cy­cle but now runs all the time, a mini-pump may have failed’

Canal Boat - - Ask The Experts -

Tech­ni­cal Con­sul­tant I RE­CENTLY READ about a boater who thought his wa­ter pump was faulty be­cause it ran all the time he was show­er­ing.

These pumps have a cer­tain out­put ca­pac­ity (vol­ume of wa­ter) at 12v and, when a tap or shower valve is open, a cer­tain vol­ume will flow; if that vol­ume is lower than the pump ca­pac­ity, the pres­sure in the sys­tem will rise un­til the pump turns off. Then, when the pres­sure drops, the pump will cut in again.

This is cy­cling and can be nor­mal. If the vol­ume that flows is more than the pump ca­pac­ity, the pres­sure in the sys­tem will drop un­til the flow equals the pump de­liv­ery and the pump will run all the time.

An ac­cu­mu­la­tor, if fit­ted, does not al­ter the above, it will sim­ply al­ter the fre­quency of the cy­cling. If your pump used to cy­cle but now runs all the time an out­let is opened, it prob­a­bly means that one or more of the mini-pumps in­side the main pump have failed.

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