Question about Honeywell Programmable Thermostat Heater

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Replacing double pole 220 v with honewell ct410a two wire120/140v wiring diagram not clear

I am replacing a double pole 220 volt thermostat with a honeywell ct410a two wire 120/240 volt how do I connect the four wires to the two wires on the thermostat for 240 volts

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1 power wire (120v) will go to the thermostat and 1 power wire (120v) will go directly to the unit. The other wire on the unit will go to the other side of the thermostat. The safety precaution behind using a single pole to replace a double pole contactor is that you will always have 1 leg of power going to the unit. Many systems are designed like this from the factory, but it is always better to have a 2 pole to cut all power off to the unit unless it's in operation. The unit will still not work as long as it does not have both legs of power.
L1 to Thermostat T1 to Unit
L2 and T2 wired together.

This is only for 240v systems. 120v Will have 1 common and 1 power, therefore you will need to know which wire is which. Power to thermostat, common wired direct.

Posted on Dec 08, 2013

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