Question about Grundfos JPS4 1 HP Pressure Booster Pump

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Grundfos jps4 wiring diagram - Grundfos JPS4 1 HP Pressure Booster Pump

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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: will not keep pressure

you need to get a linear one way check valve and install it on the outlet side of the pump as close to the pump as convienant. It would be a good idea to put a traditional one way flapper valve on the inlet side as well. It worked well for me.

Posted on May 14, 2009

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SOURCE: My Grundfos JPS4 1 HP Pressure Booster Pump keeps coming on for a

Definately sounds like a leak in the pipes from the pressure side of the pump onwards, even the smallest leak will cause it to turn on to regain adequate pressure.

Posted on Jul 09, 2009

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Grundfos pump


It sounds like you have a bad pressure switch. I would also check the pre-charge pressure in the expansion tank. This needs to be 2lbs less then the "cut-in" pressure of the switch IE: 30-50 switch 28lbs air in pressure tank.
RJH2O

May 11, 2013 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

In wiring the pump, it has blue and grey wiring. Which is hot and which is neutral?


It has been awhile since I have installed this pump but I think the blue is neutral and grey is hot. Thank you.

Jul 27, 2011 | Grundfos JPS4 1 HP Pressure Booster Pump

2 Answers

Grundfos water pump is humming with no turning, if I take pump cover off and turn the shaft it starts?


Sounds like it could be a blown capacitor in the motor. Disconnect from the power supply and remove the capacitor - it is usually situated undet the terminal box cover- examine it for leakage or distortion and replace it if necessary.

Jan 04, 2011 | Grundfos JPS4 1 HP Pressure Booster Pump

2 Answers

How to remove the impeller off my Type UP26-96F Grundfos circulation pump


Most of these style knock off in a counterclockwise direction. The impeller is usually threaded onto the shaft that way. A small brass drift and hammer should move it easily.

Jan 08, 2010 | Grundfos JPS4 1 HP Pressure Booster Pump

2 Answers

My Grundfos JPS4 1 HP Pressure Booster Pump keeps coming on for a


SOUNDS LIKE YOU HAVE A LEAK DOWNSTREAM PROBABLY UNDERGROUND. THE PUMP HAS NO REASON TO COME ON EXCEPT TO BUILD THE PRESSURE BACK UP. HOPEFULLY YOU HAVE A GAUGE IN THE DISCHARGE LINE YOU CAN WATCH IT DROP AFTER THE SYSTEM SHUTS OFF. HOPE THIS HELPS, JODY

Apr 27, 2009 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

Will not keep pressure


you need to get a linear one way check valve and install it on the outlet side of the pump as close to the pump as convienant. It would be a good idea to put a traditional one way flapper valve on the inlet side as well. It worked well for me.

Mar 26, 2009 | Grundfos JPS4 1 HP Pressure Booster Pump

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