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Dew Point Sensor for HVAC — 4 Comments

  1. Note: The little degree symbol appears as a ? in the comment submitted section. We have to edit the comment to use the word “degree” instead.
    Note To WP developers:Is there an easy fix, we have no problem making the symbol appear in posts and pages using the symbol insertion tool?

  2. Hmm. The “?” symbol in my post started out as the “degrees F” symbol.

  3. I’ve got a GE/Telaire 9002 Vaporstat. I’m mostly happy with it, especially it’s configurability. I also need the simple open/close switch at a given dew point threshold. However, the 9002 only allows setting the threshold on 5 degrees F intervals (55, 60, 65, 70, etc.). That would be OK, except that it enforces a minimum hysteresis (dead band) of 5 degrees. Which means that if the dew point crosses the threshold (say, 65 degrees) and the relay goes on, then the dew point has to drop *below* 60 degrees before the relay will turn off – even if it sits at a measured 63 degrees dew point for an entire day.

    The manual says that the factory-set hysteresis is 2 degrees, but I can’t set it to that.

    All dew point sensors will require at least 4 wires – two for power and two for the relay contacts.

  4. I am looking for dew point controller with 2 wires which can open and close the water valve, thus prevent condensation. I just need a sensor with 25 to 50 feet of pipe which can be connected to 24V zone valve.

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