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Thread: Wrong solar reading

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    Wrong solar reading

    My SolarTouch says it's 20*F on my roof even though the air is 86*. I cut and stripped the wires going into the SolarTouch from the water and solar sensors just to make sure that wasn't the problem and it isn't.

    I'm assuming the next step is to replace the solar sensor? When Pentair was out to fix my pump they said the water temp sensor was not a Pentair brand and that that could cause a misreading. So it seems like it would be good to replace the solar season with a Pentair brand one anyways.

    Just want to be sure before I climb up there since I'm terrified of heights!
    12,000 gallon IG plaster
    Cartridge filter
    Intellifo VS
    EasyTouch Controller
    Pentair SWG

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    Isaac-1's Avatar
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    Re: Wrong solar reading

    This does sound like a typical failed sensor
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Wrong solar reading

    There a chart somewhere that gives you the conversion from resistance to temperature. I used it to test and confirm proper operation of my sensor.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: Wrong solar reading

    I replaced the sensor and it still isn't working. Luckily it's under warranty.
    12,000 gallon IG plaster
    Cartridge filter
    Intellifo VS
    EasyTouch Controller
    Pentair SWG

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    Isaac-1's Avatar
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    Re: Wrong solar reading

    Have you checked the resistance to the wire going to the sensor?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Re: Wrong solar reading

    I had something similar, replaced the sensor, didn't help, finally found that the wire from the controller had been chewed by something.
    DONE, 20 x 40, inground gunite, 30" raised bond beam with 3 12" sheer descents, 8' diving board, pentair 420 cartridge filter, vs-3050 pump, intellechlor ic-40, auto cvr, Tahoe blue pebble tech, 6ea 4' x 12.5' & 2ea 1' x 12.5' helicol solar panels, legend robotic cleaner.

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    Re: Wrong solar reading

    An ohm meter and the chart (which I think I saw in the manual for my solar control unit) will tell you is the senso is working properly.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Isaac-1's Avatar
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    Re: Wrong solar reading

    chiefwej: The OP has a Pentair Suntouch controller which I think uses a different calibration curve from the ones used by the Hayward Aquasolar controllers which have the chart printed on the cover of the manual.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Wrong solar reading

    Every sensor I've seen uses the same standard calibration. I changed my controller to a Pentair SolarTouch and didn't have to change my sensors. I think they are all 10 k sensors. Here is a listing for the standard sensor that most every solar system uses.

    Amazon.com : Goldline, Jandy, Pentair 10K Water/Air Temp Sensor-New : Swimming Pool Solar Heaters : Patio, Lawn Garden
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Isaac-1's Avatar
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    Re: Wrong solar reading

    They are mostly 10K sensors, but they have different curves so all read the same at the 10K point (77 degees F), but vary at different rates the farther you get from 77 degrees F, which means you have some ability to interchange on units that only cover swim temperatures as they still stay fairly close near 77 degrees F, the problem is ones with digital readouts, freeze protections, etc.

    I think the Hayward solar products use "Z" curve thermisters, not sure which curve Pentair uses, maybe S curve, which differs from Z curve by about 7 or 8 degrees for the reading at 32 degrees F on one to the other.

    p.s. regarding your link, buy one and read the ohms for yourself in a glass of icewater vs a genuine Hayward, I have done it with ones sold as universal on ebay
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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