H
HeatStar
Hi all,
Wondering if anyone can help me on this. Fitting a Salamander ESP negative head pump for a friend to convert all gravity hot feeds in the house to pumped. The question I have is this: Does a negative head pump still need a minimum head of pressure from the cold water tank? Or can the pump be sited in the loft space at the same height as the cold water storage tank? The MIs state "600mm or less possible with negative head pump"??
I have done the installation using the Salamander S flange and fitted the pump in the loft at the same level as the tank. After priming the pump with natural flow of water it then ran for a short while before shutting down and indicating air starvation via the LED display. After repeating this procedure it seems as though that when the pump runs it is drawing in air via the vent pipe - I can literally hear it sucking in. It shuts down every time after running for about 10 seconds.
Do I need to re-locate the pump into the airing cupboard below to provide a minimum head of pressure? Or is there a blockage or restriction somewhere that is causing air to be drawn in via the vent pipe? I always thought the purpose of negative head pumps was to allow installations where a head of pressure was unachievable.
Many thanks
Wondering if anyone can help me on this. Fitting a Salamander ESP negative head pump for a friend to convert all gravity hot feeds in the house to pumped. The question I have is this: Does a negative head pump still need a minimum head of pressure from the cold water tank? Or can the pump be sited in the loft space at the same height as the cold water storage tank? The MIs state "600mm or less possible with negative head pump"??
I have done the installation using the Salamander S flange and fitted the pump in the loft at the same level as the tank. After priming the pump with natural flow of water it then ran for a short while before shutting down and indicating air starvation via the LED display. After repeating this procedure it seems as though that when the pump runs it is drawing in air via the vent pipe - I can literally hear it sucking in. It shuts down every time after running for about 10 seconds.
Do I need to re-locate the pump into the airing cupboard below to provide a minimum head of pressure? Or is there a blockage or restriction somewhere that is causing air to be drawn in via the vent pipe? I always thought the purpose of negative head pumps was to allow installations where a head of pressure was unachievable.
Many thanks
