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Thermostat

Tlchambers
Tlchambers Member Posts: 1
edited January 20 in Gas Heating
I have a Anthes hanging furnace noticed one of the wires to the thermostat is unhooked from the back of the furnace one is red and then other is black the red on is hooked up but found the black one is not would I hook it up to the TH terminal or the TR 
Any help would be great