Upgrade HoneyWell Chronotherm III To Venstar 2491T7E - HVAC - DIY Chatroom Home Improvement Forum

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Old 08-25-2012, 03:52 PM   #1
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Upgrade HoneyWell Chronotherm III to Venstar 2491T7E

Hi all,

I recently purchased a 6 wire Venstar 2491T7E w/Integrated Insteon to replace an old HoneyWell Chronotherm III. The chronotherm has 8 wires, and the Venstar only has 6. It doesn't look like all of the wires are necessary....one appears to be for a Status LED marked (L).

Is it possible for me to make this upgrade work, or do I need to buy a different Thermostat?


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Old 08-26-2012, 05:14 AM   #2
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Do you have a link to the install manual.


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Old 08-26-2012, 09:25 AM   #3
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What terminals are used on the old stat?

If the old stat was controlling a heat pump with electric heat strips, the new stat will need more than a W1/O/B terminal. It will also need an Aux/W2 terminal.
An E terminal is also an indication that it is for multistage heat pumps.

As Been has posted an install manual link would be of great assistance. All that I see online are homeowners manuals with no diagrams or terminal listings. It looks like the new stat does not have Aux or E terminals on other posts. Is this listed on the package?
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chronotherm , honeywell , insteon , venstar

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