Honeywell Thermostat Wire Diagram

It seems some wiring harnesses provide extra wires -black and brown to be used as backup if there is a problem with another wire in circuit. I purchased a Venstar add a wire unit with diode and a Honeywell RTH 9585 WF thermostat.

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Running new thermostat wire can challenging even for professionals.

Honeywell Thermostat Wire Diagram. If exchanging an older-style slider unit with a digital upgrade draw a schematic of the original wiringterminal pairings before extracting the wires. W - white wire - this wire goes to the gas controls to engage the heat on a call for heat from the thermostat when you have it set to heating mode. Between the thermostat and the heating or cooling equipment is a set of low-voltage wires that are run from the thermostat control terminals to the terminal screws on.

If the thermostat has separate E and Aux terminals install a jumper between the two. Locate the wire connection terminals inside the thermostat body and loosen all the retaining screws so that the terminal receivers are opened sufficiently to accept the harness wires. A vertically-mounted standard 2 x 4 in.

Finally this way. However if your thermostat information says a C wire is required then this information is for you. To release wire press the button on top of the terminal.

Selecting Terminal Identifications for System Type. Honeywell should provide a wire jumper if needed with stat. 27 for mounting the sensor CAUTION on an inside wall about 5 ft 15m above the floor.

WALL MOUNTING HOLES M19916 MOUNTING SCREWS 2 WALL ANCHORS 2 WIRES THROUGH WALL AND WIRE SLOT CONVENTIONAL SCREW TERMINALS HEAT PUMP M19951 Y2 L E AUX S1 S2 Y2 W2 S1 S2 RC R OB Y G C RC R W Y G C Table 1. Remove RRc jumper for 2-transformer systems onlySee wiring diagram on page 5 Connect common side of transformer to C terminal Install batteries in back of thermostat optional if AC powered. Connect thermostat to zone panel.

Running New Thermostat Wire It is possible that you may have to run a new thermostat wire from the air handler or furnace to the location where the existing thermostat is located. More than youve ever wanted to know about the C wire. If youre replacing a smart thermostat with another smart thermostat youll already have a C-wire connected to the C terminal.

To wire the thermostat for AC power connect the common side of the cooling transformer to the Cterminal as shown at left. If you must then following these instructions and helpful hints will hopefully help you in this endeavor. To connect wire to the panel strip approximately 14 in.

Thermostat Condenser Furnace Some AC Systems will have a blue wire with a pink stripe in place of the yellow or Y wire. This wire is then spliced for the separate wire pull which is made to the condenser. Check the Honeywell thermostat wiring diagram in your owners manual for more details.

Y Compressor Stage 1 Cooling. In a cooling-only system the wires go on R and Y instead of R and W. The wire is needed for most brands and models including ecobee and Honeywell.

System Type Wallplate Terminal Identifications. How Thermostats Work. The C-wire provides a continuous flow of power to the thermostat without necessarily turning your other appliances such as the fan or cooling on or off.

In retrofit applica-tions trim end of wire if not straight. Lets start by explaining what the C wire is and why its needed. Honeywell have been in business for over 100 years so they have a lot of Thermostat models.

The 18 refers to the gauge and the 5 refers to how many individual wires are inside the cable. If you have a C wire place it into the C terminal on your wall plate. Honeywell Thermostat Instruction Manuals.

The wire for the Y terminal is usually yellow. Mercury switches were commonly used in bimetal thermostats. For instructions on how to wire a thermostat.

In the olden days thermostats were simple switch devices that used Mercury Switches to complete the circuit and turn on the heatAC. Many thermostats function without a C wire by periodically pulling power from one of the other wires usually the red wire. On a heat-only system one of the wires usually red goes on the R terminal and the other wire usually white goes on the W terminal.

Always refer to your thermostat or equipment installation guides to verify proper wiring. However I also have another 2 wire red connected at R and white connected at Y. The thermostat uses 1 wire to control each of your HVAC systems primary functions such as heating cooling fan etc.

A thermostat is wired to a furnace or air conditioner unit and acts as a switch to turn the unit on and off automatically based on the thermostats temperature setting andor programmed time schedule. If you have heat and AC youll need 185. VisionPRO TM 8000 Touchscreen Programmable Thermostat Wire C7t89 IndoorSensor Locate and Mount C7189U Remote Indoor Temperature Sensor Optional Choose a location see Fig.

Next lets talk about the C or common wire. If you have a Trane model thermostat and have a wire labeled X or B refer to your thermostat manual. That closes the 24-volt control side of the gas furnace and begins the process of starting the gas furnace into its sequence of operation.

In case you dont know the specific model number we have also included images of each thermostat below to guide you. Use 18 gauge thermostat wire. Currently I have a 4 wire bundle connected from my thermostat to my HVAC without using the C.

In some cases one of those wires may be your common. In either case it is crucial to find the wiring diagram for the unit. Of insulation and push wire into terminal.

That is why weve provided a powerful search function so you can find the exact manual you need. Typically a thermostat wire pull is made to the air handler on split systems. 9 This diagram is to be used as reference for the low voltage control wiring of your heating and AC system.

Y - blue wire This wire goes to your air conditioner and starts the air conditioner into its sequence of. NOTE O O O O O O 1 2 3. Thermostat wire comes in various weights.

Turn off circuit breakers before touching any wires. See the diagram below for what each wire controls on your system. Honeywell Thermostats Available Here.

Pushed unused black wire to back of housing. Lets take a look at the G wire. Turned circuits back on and everything works.

Thermostat wire is just a big spool of bundled color-coded wires.

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