If you have heat and ac youll need 185. Ac service tech llc 15788 views.
Thermostat wiring color code chart.
You can find out more Diagram below
Five wire thermostat wiring diagram. Honeywell prestige wiring requirements need a minimum of 5 wires and maybe more depending on what features you want to operate humidifier etc. But here is a list of the most common wire color mappings as seen in many four wire t stat setups. Youll probably see a thermostat jumper wire connecting the rc and rh terminals.
Moreover the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the. Only after youve done this disconnect the thermostat for replacing. Providing stepped down power from a transformer.
If youve only got heat 183 is sufficient but you may want to run 185 anyway for a bit of future proofing. Thermostat wire comes in various weights. Color code how it works diagram.
The additional 5th wire will be for common. Thermostat wiring to a furnace and ac unit. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat.
Honeywell thermostat wiring diagram 4 wire examples. If you decide to get rid of your outdated thermostat for a smart or wifi thermostat be sure to mark the wires to indicate which color letter on the board they are connected to. 5 wire honeywell thermostat wiring.
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. There are only four wires going into the existing thermostat red green blue white. 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.
The table above provides a more complete list of honeywell thermostat wiring colors and their uses. We have a 19 year old condo with an old carrier mercury thermostat. Its there so you can supply power to the heating and cooling switches with a single wire which is usually red.
The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above. The basic heat ac system thermostat typically utilizes only 5 terminals. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system.
How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning systemfurthermore it includes a thermostat a condenser and an air handler with a heat source. 4 wire or 5 wire thermostat wiring problem question. We have both a natural gas furnace and an ac unit.
Some programmable thermostats eg. Heck now im not calling anyone a dummy.
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