Honeywell T6360B Wiring to Replace Old Honeywell Thermostat - Advice Needed

Postby tomguest » Mon Nov 30, 2015 11:52 am

My old honeywell thermostat has broken. I'm going to replace it with a new T6360B. My broken thermostat (off the top of my head is the same model but without the led indicator) only has the terminals 1 & 3 wired to the control board (see attached picture).

Do I only need these two terminals or do I also need to wire in terminal 2? The current wiring has been made such that adding a third wire at the thermostat end is going to be a bit of a nightmare.
old thermostat
control unit
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