Is this wiring scenario dangerous? Is it likely produce sparks or damage my HVAC system?
Please read the description and see the image below.
I didn't have a C-wire for my Emerson Sensi smart thermostat so I got an AC adapter. The adapter has two wires. Instructions say to put one of them in the C slot and the other into either RC or RH.
However my system (gas furnace and central AC) requires both the Blue RC and the Red RH wire to function properly. I tried putting the second wire into Y2 and W2 to see if that would work, no luck.
The working combination was to place one wire into the C slot as seen below, and the second one I twisted together with the RH wire. Works well so far.
Let me know if you think this could be a problem, and what else I might try to fix this.
From my reading, it seems like I could probably add a C-wire without this silly AC adapter, but it's an apartment with a cramped furnace closet and I would like to avoid running new cables through the wall.