Its there so you can supply power to the heating and cooling switches with a single wire which is usually red. The basic heat ac system thermostat typically utilizes only 5 terminals.
Today i want to talk about how simple a thermostat really is how the common and hot wire goes to a transformer how you tie the white wire for the heat strip connect the green wire which controls.
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Honeywell 5 wire thermostat wiring diagram. We have a 19 year old condo with an old carrier mercury thermostat. The additional 5th wire will be for common. Color code how it works diagram.
The table above provides a more complete list of honeywell thermostat wiring colors and their uses. 4 wire or 5 wire thermostat wiring problem question. Thermostat wiring to a furnace and ac unit.
Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. This thermostat wiring diagram is a split system. Our wiring diagrams section details a selection of key wiring diagrams focused around typical sundial s and y plans.
5 wire honeywell thermostat wiring. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system. However these colors can be different.
Providing stepped down power from a transformer. But here is a list of the most common wire color mappings as seen in many four wire t stat setups. These split systems include an air conditioner with a gas furnace oil furnace or electric furnace.
Honeywell thermostat wiring diagram 4 wire examples. Youll probably see a thermostat jumper wire connecting the rc and rh terminals. Heck now im not calling anyone a dummy.
Furthermore the wires going to the condensing unit are shown in red and white. C 24 vac common you might see blue purple or brown typically used for this wire. The main trouble is dealing with those different colored wires knowing which one does what and if that wasnt enough you also have numbers and letters to deal with.
Faq t6360 room thermostat wiring operation faq wiring diagram s plan pump overrun st9400 and dt92e. We have both a natural gas furnace and an ac unit. Some programmable thermostats eg.
Rc red wire power 24 vac rh or 4 red wire jumpered power 24 vac w white wire for heating enable y yellow wire for cooling enable. The honeywell home trademark is used under license from honeywell international inc. How to wire a thermostat thermostat wiring diagram.
The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above. Ac service tech llc 15788 views. Honeywell prestige wiring requirements need a minimum of 5 wires and maybe more depending on what features you want to operate humidifier etc.
There are only four wires going into the existing thermostat red green blue white.
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