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  1. #1

    Confused Neptronic Thermostat Problems

    Hello,

    I am replacing an older Honeywell with a Neptronic TRO24T4XYZ1.

    I have 24V AC going to Pin 4 and common going to Pin 1. Unit powers up fine

    I have my demands (w, y and g) hooked up to TO1, TO2 and TO3 (pin 6, 8, 9)

    OK so my issue is the old Honeywell had no problems sending a 24v demand signal to the HVAC board. But when I use the neptronic, I read only 20 volts at the control board which is not enough to trigger the operation. The HVAC board is just a regular NO style board that requires a 24v demand. I am a little confused at the available signal types the neptronic offers and the manual is not very helpful for configuration or troubleshooting.

    The available signal modes are triac based on/off floating or pulse. I am using on/off, and I do not understand what is causing the reduced voltage on the demand, the thermostat is not very far from the hvac board and the old thermostat had no problem when closing the contact... am I just doing something wrong, any help or advice would be greatly appreciated

  2. #2
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,837
    Call a pro. I've never heard of that thermostat and wouldn't install one over a Honeywell I'm sure. So good luck with the DIY situation, we can't help with that.
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  3. #3
    I am a journeyman electrician of 10 years and I live in the rural Yukon, we simply do not have HVAC specialists up here. I am not asking for DIY repair instructions, the first neptronic unit was returned under warranty and the second unit is doing the EXACT same thing. It will be a rather expensive paperweight unless I can track down someone with any Neptronic experience. This is an Neptronic issue so before shooting down my question, perhaps we can see if anyone else on the board has any experience with Neptronic?

    Manual is here...
    http://www.neptronic.com/Controls/PDF/TRO24T4XYZ1.pdf

  4. #4
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I'd try changing the positions of JP1 and JP2 to the right, and daisy chain your 24v wire to terminals 7 and 10.

    With it set like that, the triacs will switch the 24v directly from terminals 7 and 10 to your outputs, instead of switching it through the circuitry in the thermostat.
    If more government is the answer, then it's a really stupid question.

  5. #5
    Thanks Mark, I will give that a try

  6. #6
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Please let us know how it turned out.
    If more government is the answer, then it's a really stupid question.

  7. #7
    will do, I'll be working on it tomorrow and will be sure to post the results

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Anything to report?
    If more government is the answer, then it's a really stupid question.

  9. #9
    Success, something internal was dropping the voltage and your recommendation worked. Case solved, many thanks

  10. #10
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Great, so where do I send the bill?

    I've never actually seen one of those thermostats, but have had similar issues with other types of controls that use triacs to switch control voltage.
    If more government is the answer, then it's a really stupid question.

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