<\/span><\/h3>\n\n\n\nUnfortunately, most smart thermostats need constant power to work due to the demands of the circuitry and WiFi radio. This is usually provided by the C wire. In order to help users who don’t have C wire, Ecobee has a solution where you can use the provided PEK (see “what’s in the box” above). <\/p>\n\n\n\n
The PEK is a slick solution. It steals power from HVAC systems to power the thermostat. I would need three PEKs (one for each thermostat) installed in small space (see below). <\/p>\n\n\n\n
I decided I’d be better off using the transformer to turn one of the wires going to each of the thermostats into a C wire. This also helps out if I ever want to use a different smart thermostat in the future. Additionally, I don’t think the PEK works with two wire systems. <\/p>\n\n\n\nInitial wiring. Red goes to relay, white goes to blue 24V output of transformer.<\/figcaption><\/figure>\n\n\n\nCloseup. I’m going to use blue thermostat wire as C wire.<\/figcaption><\/figure>\n\n\n\nThe transformer connected to my relays can provide the voltage I need to create a C wire. Extra wiring to thermostats exists (in the brown insulation), just not connected (this is common). I will connect the blue thermostat wire to the yellow wire from the transformer, which will provide the 24V common voltage. This turns the blue thermostat wires into a common wire.<\/p>\n\n\n\nBlue is now common (C wire)<\/figcaption><\/figure>\n\n\n\n<\/span>Connecting the thermostat to the new wiring<\/span><\/h3>\n\n\n\nNote I also swapped the red (R) and white (W) wires coming from the thermostat. I’m used to the W wire going to the relay to call for heat, and red going to 24V to power the circuit. I could have left it the way it was, but I wanted the white cord to go into W terminal on the Ecobee and red to go into the R. Now my 2 wire system is a 3 wire system with a C wire that I can wire up to the thermostat as shown in the picture below:<\/p>\n\n\n\nWiring after adding the blue C wire I connected at the transformer<\/figcaption><\/figure>\n\n\n\nAfter that, I just popped the Ecobee in. The Ecobee has a couple of different mounting options. You can just use the backplate. Alternatively, the trim plate is helpful if you need to cover up blemishes left by your old thermostat (which I needed). It is paintable.<\/p>\n\n\n\nInstalled thermostat with trim plate<\/figcaption><\/figure>\n\n\n\n<\/span>Using the Ecobee3 Lite<\/span><\/h2>\n\n\n\nSetup and usage is pretty straight forward. The thermostat walks you through the setup and most functions can be done from the web, app or directly from the thermostat. <\/p>\n\n\n\nEcobee Thermostat Web Interface<\/figcaption><\/figure>\n\n\n\n<\/span>Ecobee3 Lite initial setup<\/span><\/h3>\n\n\n\nThe first time you power up the unit it will ask you to confirm what type of HVAC system you have (which it determines from the wires connected to the thermostat). Then it will ask you for the information needed to connect to your wifi network. After that, it asks you for information it needs to run correctly, like your country and time zone. Then it gives you the code you need to register your thermostat online (from the app or on the web). You’ll need to create an Ecobee account. Then you’re done and ready to use it.<\/p>\n\n\n
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Ecobee App Settings<\/figcaption><\/figure><\/div>\n\n\n<\/span>Thermostat display<\/span><\/h3>\n\n\n\nThe thermostat is a touchscreen that is perfectly lit. It’s not too bright, and not too dull. You can easily see and use it in the dark or during the day. The screen is responsive and allows you to easily control almost all the features of the unit (schedules, temporary settings, network connectivity, etc.). The display only shows temperatures rounded to whole percentages.<\/p>\n\n\n\n
Additionally, you can check the weather forecast. You can set up security to restrict what unauthorized users can change via the thermostat display.<\/p>\n\n\n\n
<\/span>Comfort settings and schedules<\/span><\/h3>\n\n\n\nEcobee uses comfort settings to designate temperature and fan settings for different circumstances. By default, you have an Away setting, a Home setting, and a Sleep setting but you can define more if you’d like. When creating a schedule you associate times of the day with the comfort settings and that tells the Ecobee what temperature you want your home to be. The nice thing is that you can just change the comfort setting and then any part of your schedule that uses that setting will automatically update to your new comfort settings.<\/p>\n\n\n\n
Schedules are very flexible. You can define comfort settings in 30-minute increments and have different schedules for each day of the week.<\/p>\n\n\n\n
<\/span>Reminders and alerts<\/span><\/h3>\n\n\n\nYou can set up reminders via the app or the web interface. Reminders let you know if you need to service your HVAC system. They also can let you know when you need to do periodic maintenance, like furnace filter replacements, UV lamp cleaning and replacement, and general HVAC servicing.<\/p>\n\n\n\n
You can set up alerts in addition to reminders. Alerts let you know if your heating or cooling equipment isn’t performing right. As you can see below, I’ve set up alerts for when the temperature gets too low or high. Additionally, you can set up alerts for humidity levels.<\/p>\n\n\n
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App Alert Settings <\/figcaption><\/figure><\/div>\n\n\n<\/span>Vacation Mode<\/span><\/h3>\n\n\n\nI love the vacation mode. I no longer have to remember to change my thermostats scheduling before and after my vacation. With vacation mode, I can schedule this behavior. For example, I can set when the vacation starts, when it ends, and what temperature the house should be kept above while on vacation. Brilliant!<\/p>\n\n\n\n <\/figure>\n\n\n\n<\/span>Ecobee3 Lite data about your HVAC (Home IQ)<\/span><\/h2>\n\n\n\nEcobee’s “Home IQ” allows you to see how your HVAC system has performed over time. Additionally, it provides information about how efficient your system is and how it compares to similar HVAC systems.<\/p>\n\n\n\n
<\/span>System tab<\/span><\/h3>\n\n\n\nHome IQ System Screen<\/figcaption><\/figure>\n\n\n\nThe System tab provides an overview of your equipment runtime, as well as snapshots at particular times. Bars at the top show when your system was heating or cooling. The bars below compare the desired temperature (based on your comfort settings and schedule) with the actual indoor temperature and the outdoor temperature.<\/p>\n\n\n\n
This chart can show you how often your system is running and how long it takes to heat or cool to desired temperatures. It can also show how outdoor temperature affects your HVAC system. In addition, you can view your home’s relative humidity levels over time.<\/p>\n\n\n\n
<\/span>Schedule tab<\/span><\/h3>\n\n\n\nHome IQ Schedule Screen<\/figcaption><\/figure>\n\n\n\nThe schedule tab allows you to see your system runtime relative to your schedule. This chart shows how indoor and outdoor temperatures relate to the setbacks and comfort settings. You can see how long the thermostat is predicting it needs to run in advance of a change in comfort setting in order to reach the desired temperature at the desired time.<\/p>\n\n\n\n
<\/span>Weather Impact tab<\/span><\/h3>\n\n\n\nHome IQ Weather Impact Screen<\/figcaption><\/figure>\n\n\n\nThe Weather Impact tab helps you to understand how weather influences your HVAC runtime. In turn, this helps you understand how weather affects your energy bill. It shows you how long your HVAC system runs each day plotted along with the average temperature that day.<\/p>\n\n\n\n
<\/span>Runtime Report tab<\/span><\/h3>\n\n\n\nHome IQ Runtime Report courtesy of ecobee.com<\/figcaption><\/figure>\n\n\n\nThis is a monthly report that shows you the total runtime of your HVAC system during the previous month. It compares how your system ran to how much it would have run if you kept your system running at 72 degrees. It estimates your savings in terms of dollars and runtime. You only get this report once a month.<\/p>\n\n\n\n