Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Is the heater flow switch necessary?

  1. Back To Top    #1

    Is the heater flow switch necessary?

    I have just fitted a variable speed drive to my filter pump. My problem is that I can only reduce the pump speed slightly before the heater flow switch operates. I was wondering whether the flow switch is necessary and what it's purpose is?

    My pool heater consists of an oil fired boiler pumping hot water through the primary side of a heat exchanger with the filter pump pushing the pool water through the secondary side of the heat exchanger.

    I cannot see any problem if the pool water was flowing very slowly (or even static) in the heat exchanger because the boiler would just cut out on its own thermostat.

    Can anyone see any potential problem with bypassing the flow switch?

  2. Back To Top    #2
    CJadamec's Avatar
    Join Date
    Apr 2016
    Location
    Quaker Hill, CT
    Posts
    2,192

    Re: Is the heater flow switch necessary?

    You should never defeat the flow switch on a pool heater. You can damage both the heater and the heat exchanger. You can also create a dangerous potential for scalding water to be pumped to the pool which could damage the PVC plumbing or seriously hurt someone.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

    Photos of 2016 Build, Inside Your Breaker Panel, Free Copy of 2017 NEC code
    TFP is AD Free and is funded solely by member support click here to help

  3. Back To Top    #3

    Join Date
    Aug 2016
    Location
    Riverside, CA
    Posts
    378

    Re: Is the heater flow switch necessary?

    Not only that, If flow is too low, it won't end up heating the pool. Just crank up the flow when in heat mode and then turn it back down otherwise.

    The way I look at using a VSP is that I'm going to get the cost savings for normal filtration, cleaning and salt generation but am going to run it at higher flow rates when I am actually using the pool for fun. This will still result in a tremendous savings in electricity and money because the pump runs way more for the former than it does for the later; it runs every day of the year between 4 and 6 hours right now burning 2.3kW for the former and that will be reduced to less than 10% of that.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •