Smart Thermostat Installation
Installation
4-Wire Conventional Setup
If your thermostat bundle only has 4 wires, for the most smart thermostats, it requires an extra wire in order for the thermostat to power on therefore we need to install the Power Extender Adapter which creates an extra wire for you.
*Most thermostats are powered by batteries, but for most smart thermostats, it relies on the C wire because the C wire is what provides power to the thermostat. If you have an extra unused wire at the back of the thermostat bundle, you can use that wire as a C wire. Make sure that C Wire is connected to the C terminal on the furnace control board as well.*
Dual Transformer Setup:
If two separate R wires come from the wall and attach to the Rc and Rh terminals of your thermostat. Most likely, you have a Dual Transformer Setup.
Troubleshooting
Is your furnace fan continuously running when you're not expecting it?
1.On your thermostat, check which equipment is running right now.
2. If your blower fan is running, and there is no indication that the fan is running on the thermostat, it means the thermostat is not calling for the fan to run. Something may be wrong with your blower fan.
3. If your thermostat does indicate the fan is running, it means the thermostat is calling for the fan to run. Check your thermostat settings.
4. Remove the thermostat and check if the blower fan will stop.
-If the blower fan is still running, this means there is something wrong with your blower fan.
-If the blower fan stops, it's possible there might be something wrong with the terminal pins at the back of the thermostat. It's possible the G terminal is fuse closed.
Dry Contact Test:
To determine if your HVAC equipment is working and running without the thermostat installed on the wall, we can perform a dry contact test where we can tap and hold the indicated wires together and see if the corresponding equipment will run. Note that for each test, there should be at least 24 Volts between the wires.
Note: Do not touch Rc and C together or else the furnace fuse will blow!!!
Voltmeter Test:
1. To test the voltage of an AC circuit (As seen in the image), set the knob to V~, ACV, or VAC. Household circuits are almost always Alternating Current.
(To test voltage of a DC circuit, choose V–, V---, DCV, or VDC. Batteries and portable electronics are typically Direct Current.)
2. When adjusting the knob, choose a setting higher than the maximum expected voltage. If you have no idea what to expect, choose the highest setting to avoid damaging the device.
Since our expect voltage is 24V, we'll be adjusting the setting to the nearest voltage higher than 24V which is 200V.
https://www.wikihow.com/Use-a-Voltmeter
