There are two sides to the 24-volt transformer: A high side and a secondary – or low-voltage – side. I have a RC and a RH wire on my thermostat now. The device typically converts 120 VAC to a lower voltage for use in push buttons. Needed on some electronic thermostats or if you have indicator lamps. The high side is the line-voltage of the transformer and the electrical connection to the feeding voltage, generally a 120-VAC power. Others say piggy-back the hot side of the transformer to your R wire on the Thermostat. Unless one of the wires has continuity to the transformer core, the polarity doesn't matter.
This brings the common to ground potential and helps with troubleshooting.
(E), blue, pink, gray or … York and Trane like to use (B) as common. Wouldn't grounding the common, which it obviously doesn't, unless in the event of a short, cause unwanted voltage to continuously energize the chassis? The secondary or low-voltage side is …
Some say only use the Common side a the C-wire and don't use the hot side of the transformer. On many hvac units the 24v control transformer common is grounded to the unit chassis. (B) or (X), Blue, brown or Black, common side of transformer. So I see 3 ways to do this. Transformer windings have a phase relationship, but it's typically not important for power supplies. The lower voltage is sent to the push button to engage the chime mechanism. Add-on 24v A/C common to the C terminal on the thermostat (one wire used only) The most common application for a 24 VAC transformer is to activate a doorbell chime. Do not confuse with (B) Reversing valve (energize to heat) above. A 24 VAC (volt alternating current) transformer is a step-down type of transformer. A relatively safe way to test transformers is to hook up a small AC voltage (1-5VAC) and measure the voltages across the other windings.
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