American Standard Heat Pump Wiring Diagram - Wiring Data - In case you best have four wires they're commonly (crimson, yellow, green & black). If you have (blue, white & blue stripe, orange, white & orange stripe, and possibly inexperienced & brown pairs as nicely) popping out of the wall then it is probably phone or networking cord and it is not good due to the fact it's far too thin for the contemporary. If there is a brief then the current via the tiny wires may want to motive a hearth (thermostat wires are generally #18 gauge.) Those colorations are not popular for thermostats.
If there is a name for cool, r is attached to y (compressor). In air conditioning mode the thermostat controls the fan, so g (fan) is likewise linked to r. For cooling, the furnace generally selects the high velocity of the blower.
The furnace controls the fan due to the fact oil and gas warmness isn't on the spot. A good way to keep away from a blast of cold air, the furnace controls the fan. It could do that with a easy delay or with the aid of temperature set by the restriction transfer within the plenum.
In traditional heating that's oil or fuel, the furnace controls the fan, so simplest r is attached to w (warmness). For electric heating, the thermostat controls the fan (g), accordingly in this example both g (fan) and w (heat) are related to r (24 vac). For heating applications, a decrease blower speed is used and the furnace selects it.
To run the fan, the thermostat connects the fan (g) terminal to r. On thermostats with multiple r terminals (for instance rh and rc), g is usually switched to rc, despite the fact that the "gasoline/electric" switch, if it exists, may also exchange this.
Rc and rh had been brought to deal with separate transformers for cooling and heating, respectively. Hence, for unmarried transformer systems, rc and rh are jumpered collectively and count on the function of the r terminal. A few systems use r and rc; so don't forget r to be rh in this case. Rc is described as r (cooling) and rh is defined as r (heating). Frequently, both letters are in uppercase as in rc and rh.