Joined
·
3 Posts
A friend of mine just purchased a new condo in Denver. I'm guessing the building was constructed in the 70's or 80's, by the appearance of it. The condo unit has hot water baseboard heating, and has a stand-alone pneumatic thermostat for that.
The AC unit is also stand-alone and has its own, separate thermostat. The outdoor unit an old Westinghouse wall-mount, similar to a Bard unit. I want to replace the old thermostat with a new one. The old one still has a mercury switch and doesn't work too well after decades of service.
I pulled off the cover of the existing AC thermostat and there are only three wires; red, white and black. These differ from the modern wiring of thermostats that control heating and cooling (red, yellow, green, blue, and white). I tried searching the Westinghouse unit model number from the nameplate, hoping to find a wiring diagram, but nothing comes up.
Has anyone seen this before? Are these 3 wires just hot, neutral, and ground? How should a new thermostat be wired to properly control the outdoor AC unit?
The AC unit is also stand-alone and has its own, separate thermostat. The outdoor unit an old Westinghouse wall-mount, similar to a Bard unit. I want to replace the old thermostat with a new one. The old one still has a mercury switch and doesn't work too well after decades of service.
I pulled off the cover of the existing AC thermostat and there are only three wires; red, white and black. These differ from the modern wiring of thermostats that control heating and cooling (red, yellow, green, blue, and white). I tried searching the Westinghouse unit model number from the nameplate, hoping to find a wiring diagram, but nothing comes up.
Has anyone seen this before? Are these 3 wires just hot, neutral, and ground? How should a new thermostat be wired to properly control the outdoor AC unit?
Attachments
-
1 MB Views: 156
-
1 MB Views: 168
-
1.3 MB Views: 117