Thermostat wiring question

[rakesdl]

I recently installed a electric (220) heater in my garage, but have not completed the wiring. I need to install a wall thermostat. I purchased a double pole thermostat that has a red and black wire coming out the back and need to wire it based on the wiring diagram attached. Question is should i have purchased a single pole (one wire) or use the double pole and wire it breaking into both the wires.

 

[Aceman]

use the double pole and wire it breaking into both the wires.

That's what you want.

 

[mmg440]

With the Thermostat controlling the contactor (as shown) you could use a single pole. However you could also just use one leg of the two poll to control it as well. So you are fine with what you got for the thermostat just by utilizing only half of it.. But it looks to me from the pic of the schematic like you have a three phase heater there and I think that may cause you a problem if you have residential electrical service. Maybe I am just looking at wrong?

 

[rakesdl]

MMG440, You are right that it shows three phase, but i have rewired it to run 220 single phase, it now has two wires one to L1 and L3, L2 no longer in use, do you think the thermostat will still work being wired like that? all i know is that the wires that are shown on the left of the diagram are 110 volt and run through the over limit switch, that is where the original thermostat was wired.

 

[mmg440]

Yea, I would think the T stat area of the unit using the contactor should work the same. Using one pole of your two poll unit should work fine or replace it with a lower cost single poll unit.
With one element out of the circuit the unit will loose about 1/3 of its rated output. This may or may not be a issue with the air flow of the unit. Just judge the air temp out of the unit to see if too cool you may need to make changes to slightly reduce air flow. But it may be fine.