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  1. #1
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    Nov 2018
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    Reznor make up unit

    Hello I have a Reznor make up unit, this was previously wired before me and only runs in high fire. This unit has a maxitrol gas valve and is controlled by the AD1010U amplifier. We hooked the d/a sensor to proper terminals. When we start the unit the lights on AD1010U board power red is on and so is relay red on, the green valve never comes on no matter if I turn dial up or down on amplifier (55-90). It is the correct matching D/A sensor. My question is any advice why this only stays in high fire. I did notice on the terminal strip for your low voltage wiring for a stat they do have wires ran to red,green,common,and W1. Should there be no wired to low voltage term strip since we are using da sensor and the amplifier to control just discharge air?

  2. #2
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    Nov 2018
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    Thread Starter
    I ohmed the sensor out before hook up and was reading 5800ohms, specs says should be between 8000-12000.

  3. #3
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    Nov 2018
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    Thread Starter
    The wires on the low voltage terminal strip seem to be coming from a separate starter panel with a summer,winter switch and off/auto switch. I have panel in auto switch and in winter which activates burner light to on

  4. #4
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    Apr 2001
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    looks like a bad supply air sensor, when it is open or below set point the maxitrol valve will modulate to high fire. check to see if you have full voltage to the modulating valve and see if it changes when you change the discharge air temp setpoint.

  5. #5
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    Nov 2018
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    Thread Starter
    Thanks, yea the sensor is new and never been used, I always have 0vdc to gas valve no matter where I turn that valve. They did mount the sensor practically in the heat exchanger though, wondering if that hurt the sensor

  6. #6
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    Nov 2018
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    Thread Starter
    I mean turn the d/a set point on the ampliflier

  7. #7
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    Nov 2018
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    Thread Starter
    Any comments or help with the low voltage term strip in unit, does this have to be used?? Not sure why you would use it for a stat when the unit runs constant for fresh air and uses the AD1010U to maintain discharge air.

  8. #8
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    Sep 2006
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    If you really have 0 vdc at the gas valve, it should be at low fire. Must be a faulty gas valve.

  9. #9
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    Nov 2018
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    Thread Starter
    Thanks but that is untrue for the amplifier i am using which is an ad1010u series 21 which specs are 17vdc or more is low fire, 0 vdc is high fire.

  10. #10
    Join Date
    Jul 2008
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    Nova-Scotia, Canada
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    https://s3.amazonaws.com/s3.supplyho...t-Overview.pdf

    See if it has the optional stat in the space. Disconnect it, play around. Not sure if that model but with the standard maxitrols you could open and short the discharge air sensor for lo/hi fire

  11. #11
    Join Date
    Sep 2006
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    Ohio
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    Quote Originally Posted by shillman View Post
    Thanks but that is untrue for the amplifier i am using which is an ad1010u series 21 which specs are 17vdc or more is low fire, 0 vdc is high fire.
    Sorry about that, I was assuming it had a Maxitrol MR212D gas valve. What kind of gas valve is it? Have you checked the discharge air sensor, that could be causing the problem.

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