QuestionsCategory: QuestionsWiFi Install no C Wire for thermostat or control panel
Handyman Staff asked 2 weeks ago

New home and trying to change old thermostat. New DIYer for electrical and HVAC. No C Wire however it does have 5 wires. RH, RC, Y, W, G.

Attached is the schematic on the actual unit. I am unsure how I would be able to wire a new thermostat without a C terminal. I have a Honeywell adapter coming in however I don’t know which wires to attach it to. Not having a control panel with terminals made this confusing.

The schematic shows only 4 wires but to my understanding and per the photos. RC and RH attach to the R line making it all one for the thermostat.

The white wire with 5 internal lines runs directly to the thermostat. The brown wire with red white and us used green come from outdoor unit.

Any help would be appreciated!

enter image description here

enter image description here

enter image description here

enter image description here