New thermostat - Heat Pump - Mystery "K" wire
I searched through other topics and did not see anything that was quite the same issues as I'm having with my heat pump - hopefully someone here can help me! I think the answer will be simpler than the question itself:
I live in a condo with a heat pump. Unfortunately I don't know the brand or the age, but we've lived in the unit for almost 7 years and never had a problem with it. Now that we're selling, I thought it would be a good idea to replace the thermostat, since the current one is most likely the original (and is hideous!)
I bought the RTH2510 from Home Depot. The wires that I found inside the current t-stat match up to the wiring guide of the Honeywell, except for a mystery "K" wire. Incidentally, it also has a W2 wire, which is "Aux" ?
The heat pump itself is inside the unit, connected to a grate to the outside. In 6 cold Toronto winters, we've never had seen the "EM Heat" light turn on, and it's only in the past couple years that we even had the EM Heat switched turned on.
There seem to be few of the Honeywell products that reference a "K" wire in their literature, and the only one I found that did, said "Do not use K wire". I have, however, deduced that the "K" wire does in fact refer to the unit's emergency heat functionality.
Would it be OK to simply cover the K wire with electrical tape and not connect it to the new t-stat? Fingers crossed, we will only be living there another few months, and really, I just want the t-stat to look nice and modern.
Being that the pump itself is not outside, can I just leave the "K" wire disconnected (provided the regular heat still works when tested) ?
Thanks in advance for any help!