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 Converting 2 Wire Thermostat to Venstar 2491T1E
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stevehoju
Starting Member

USA
3 Posts

Posted - 09/13/2012 :  9:29:20 PM  Show Profile  Reply with Quote
I have a cabin with a wall heater controlled by a two-wire mercury thermostat. I want to upgrade to a Venstar 2491T1E thermostat to allow for remote control (heat up the cabin before we get there late on Friday nights). I can easily run a common wire to the thermostat location. The question I have is whether the thermostat needs more than three wires to function properly. There is no wiring diagram for the Venstar 2491T1E, but I understand it is the same "guts" as the 30410A. Based on this, it looks like I can connect my wires to C, R, and W1. Is this correct or does the the thermostat need any other wires or jumpers?

Thanks!

Tfitzpatri8
Administrator

USA
8594 Posts

Posted - 09/13/2012 :  9:38:33 PM  Show Profile  Reply with Quote
You need power and a relay to make that compatible. Here's the kit: http://www.smarthome.com/30418/Thermostat-Two-Wire-Heat-Only-Kit-ACC0436/p.aspx

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stusviews
Moderator

USA
11449 Posts

Posted - 09/13/2012 :  10:07:41 PM  Show Profile  Visit stusviews's Homepage  Reply with Quote
Just having three wires is not adequate. Does the heater have a 24VAC power supply? If so, C, R, and W1 are the only connections you will need.

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stevehoju
Starting Member

USA
3 Posts

Posted - 09/16/2012 :  7:52:06 PM  Show Profile  Reply with Quote
Sorry, forgot to mention the heater does have a 24v transformer, so I should be covered as far as power supply.
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stusviews
Moderator

USA
11449 Posts

Posted - 09/16/2012 :  9:12:03 PM  Show Profile  Visit stusviews's Homepage  Reply with Quote
You can run the third wire or use the kit.

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stevehoju
Starting Member

USA
3 Posts

Posted - 10/30/2012 :  9:12:48 PM  Show Profile  Reply with Quote
Finally ordered the thermostat and tried to install and connected to the 24v transformer on the heater it just cycled, turning the heater on, then turning off. Sounds like I need the relay kit.
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