Thanks for contributing an answer to Home Improvement Stack Exchange! This next step is important. In my system, a blue wire runs from the 24V Common to the thermostat but was unused at the old thermostat. Field inspection worksheets are included at the back of the volume. Note: Touch the orange Help button on any screen for more information. If all looks good, push to continue. Should i let it run longer? You can tap on it to bring it up and begin controlling your thermostat remotely. If the thermostat calls on W3 then you would have all three energized and that may cause problems with the furnace controller.
Then go to the unit to make sure it is not on. There are three wires at the thermostat. The Nest Thermostat is one of the most popular smart thermostats on the market, mostly thanks to its unique design and easy-to-use user interface. They can get bent or loose connection. Below we will describe to you how to hook up a digital thermostat, hook up a programmable thermostat, or hook up any type for that matter. The new thermostats require power. If the hot wires comes from the cooling system then you should use that common.
For most split systems you will have two circuit breakers for the air conditioning and heating system. I have it set to auto. Both examples of how to wire a Honeywell thermostat with 4 wires are discussed below. The bit should be slightly smaller than the anchor. Problems caused by improperly installing a thermostat.
One black goes to connection L, one white to connection Y. However, these colors can be different. The wiring was the same W to white, Y-yellow, and G- green. Be sure that you label the wires before disconnecting them from the old thermostat, or if you are installing new equipment, identify the incoming wires from the equipment terminals and its manual. Then take the labels and label each wire for the terminal where the thermostat wire was landed and note the color to the terminal for the wires you will soon disconnect. This will display the local weather on your thermostat.
I will describe the advantages of the programmable thermostat in full detail in a different section below. However, your system may not be common and different colors could have been used. The valve connectors are labeled with numbers 1-6. Prices and availability of products and services are subject to change without notice. Honeywell does make a newer round digital thermostat.
You might also have to turn off a third breaker for the wire that gives the thermostat power. The bit is the perfect size for the anchors. These components will energize the fan, heating, or cooling depending on the selection. I decided to upgrade to a programmable tstat. Also, I have no wiring for the readings on the face so I needed a battery-operated model. Some are successful at changing the thermostat and some are not. Then lift up on the button.
Proper settings ensure you will get the best out of your heating system and your thermostats. To get an entry key, go to your Nest Thermostat and push on the unit to bring up the home screen. By using this form you agree with the storage and handling of your data by this website. To navigate through setup as well as the different menus when you have it set up , spin the silver dial on the unit in either direction to move the selector on the screen, and then push on the entire unit to select it. I hooked my old source1 back up and it is fine. I now have a new thermostat Honeywell ct31a1003 and is a 4 wires. Aug 22, 2014 Robert said: Super! Make sure it is as level as possible.
Notes to the table above Also see these other - Honeywell Wall T87-F type Thermostats for sketches and drawings of Honeywell thermostat wiring hookups. Provide details and share your research! Whether the old thermostat is bad or not if you simply want to replace your old one and hook up a new one the first thing you need to take into consideration is to select the right replacement thermostat. You can also use the included wire labels in the Nest instructional booklet to mark the wires, but taking a photo and noting where the wires go is good enough. Number of heat pump compressor stages Select 1 Stage default or 2 Stages. When you are sure that it is level, tighten the screws.
It requires replacing batteries which isn't difficult. Be sure to read and follow all of the instructions including some good suggestions about labeling wires and of course turning off power to the system while fooling around with the thermostats. Once your wall plate is screwed on and level you're ready to put the wires into their ports. Also on the back of the tstat, there are pins that connect the tstat to its base. Question: Aug 18, 2014 Robert said: Trying to replace a Honeywell model T834C1954 mercury stat for heat pump with new Honeywell programmable. Tel: 416 964-9415 1-800-268-7070 Email:.