Smart Thermostat V100 Kuuma

[Laynes6999]

I was fortunate enough to score a brand new Honeywell smart thermostat for 2.00 at a bin store. Since I put temp probes in my flue, return and plenum on the VF, I wanted to put the smart that there. It had a 2 wire thermostat wire (from all the old woodfurnaces) so I ran a 5 wire to power the thermostat. I cannot for the life of me figure out how to wire the VF so it has both speeds. I didn't have the issue with my digital stat with batteries, but maybe it just won't work? Here's the thermostat I installed.

 

[brenndatomu]

You just need 2 wires...one to bring the 24v up from the furnace, and one to take it back down to the contactor that switches it from low to high speed.
When the blower starts up it will already be on low...so nothing extra needed there.

 

[brenndatomu]

The low limit snap switch on the plenum is the one that starts the blower (on low) and then if the tstat calls for heat the blower shifts to high. (which I didn't think made a big difference...but sounds like you may need more CFMs than me)
By the way, that snap switch is supposed to be moved up to the very top of the plenum for best results...not sure if that info was still attached to your unit, with how you got it n all...

https://www.lamppakuuma.com/wp-content/uploads/2018/10/VF100-Electrical-diagram.pdf

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[Laynes6999]

Yeah its in the top right of the plenum. I need 24v to power the thermostat. When I remove that it jumps to low then the tstat dies.

 

[brenndatomu]

Sounds like a simple jumper wire from the 24V coming up from the furnace (R terminal I think?) to whatever terminal of the tstat that needs to be powered up...?

 

[brenndatomu]

What model stat is that?

 

[Laynes6999]

 

[brenndatomu]

Any luck?