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  1. #1
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    Par Max 3 pump question ?

    I am using a 12v Parmax 3 ( 40 psi) pump to pump my water system at a cabin. The pump connects to a small Bosch W125k propane water heater.. All worked well until I had a freeze up... So after replaving the pressure switch on the pump and diaphram on the heater, it does not work like before. Pump and heater work however I cannot keep a steady stream of water from my shower unless I also turn on another tap ??? It seems like if there is not enough demand, the pump does not generate enough pressure to keep the propane demand heater lit so propane flares up and down and the water does as well...UNLESS I turn kitchen tap full on .. Any ideas on what I can adjust to correct this as same system worked fine before I screwed it up by forgetting to drain it ..
    thanks

  2. #2
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    When you have just the one faucet on. Does the pump go on and off a lot?

    You also said you changed the pressure switch. Does it turn the pump off at 40psi or earlier?

  3. #3
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    when only the shower on, the pump pulses on and off but doesnt really push a lot of water. At first I though the water into heater was restricted as other taps seem to work.. I dont have a pressure gauge so not sure what pressure it is turning on/off at. The only way to have a regular shower ( where the water pressure remains high enough to maintain flame in the heater ) is to turn on another faucet and this was not the case before..

  4. #4
    Pump guy speedbump's Avatar
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    You didn't answer my question.

  5. #5
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    My apologies...yes...pump does pulse when only one tap running.

  6. #6
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    So it's acting just like a Waterlogged Tank. What you have to do is set the pressure switch up higher if it's possible to do so. If not, you could disconnect the wires from the built in switch and hook up a standard pressure switch to control the pump.

    What's happening is your pump is capable of producing enough pressure to turn itself off when only the amount of water from that faucet is being used. So it's on/off on/off over and over. When it's off; you have no water until it gets up and running again.

  7. #7
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    My challenge is that this is a pre-set plug and play pump. As far as I know there is no way to adjust pressure. Again, it is odd given this set-up prior to me replacing the pressure switch ( unless something else was damaged when it froze..). Maybe I will have to disassemble pump head and check in there as well..

  8. #8
    Pump guy speedbump's Avatar
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    Are you sure it's the right pressure switch? I forgot you had changed it. You are probably going to have to put a gauge somewhere so you can see just what pressure it's building. If it's lower than 40 psi, that's your problem.

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