Wall Thermostat Wiring - PSG CADDY ALTERNA II Installation And Operating Instructions Manual

5.13 WALL THERMOSTAT WIRING

The furnace must be connected to a thermostat. You can use the one provided with the unit or use one that is
already installed in your home. The thermostat must be installed on an inside wall and located where it is not
likely to be affected by the draft coming from an air outlet. It must be installed at a minimum of 55 inches above
the floor. It is recommended to connect the thermostat to the furnace with a seven or eight threads wire
connecting terminals Rc, Rh (connect only one of the two terminal R if there is a jumper between Rc and Rh in
the thermostat), C, W, Y, G and O. If the thermostat is using a dry contact (powered by batteries), it is not
necessary to connect the C (common) terminal to the thermostat. Refer to the electrical diagram.
If you want to provide power to the thermostat, note that the connections may differ depending on the
thermostat: Some thermostats need Rc and C while others require Rh and C (in this case, verify the need for a
jumper between Rc and Rh in the thermostat user manual). No jumper is required with the thermostat supplied
with the furnace as the Rc and Rh are already connected together. Also, some thermostats have only the letter
R. In this case, R refers to Rh. (Connect only one of the two terminals R if there is a jumper between Rc and Rh
on the thermostat). Refer to the wiring diagram.
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