Installing Cielo Smart Thermostat with a C-wire

Tools you need

- Drill for mounting anchors (3/16” drill bit) 

- Small flathead screwdriver 

- Phillips screwdriver 

- Wire stripper (optional) 

- Hammer (optional) 

- Pencil (optional)

Step 1:  Power off your HVAC system using the:

 

1. The master switch   OR    2. The circuit breaker

Step 2: To be on the safe side, ensure that your system is completely switched off. Double-check that:

1. No air is coming out of air vents

2. Main flame is extinguished in case of boiler

Step 3: Go to your already installed thermostat and remove it from the wall.

Step 4: Look closely for any of the following indicators on your old thermostat’s backplate:

If you find any of the above indicators, you should stop right here, as your HVAC system might not be compatible. 

In case of no such indicators, you can continue with the installation.

WARNING: Cielo Smart Thermostat only works with 24V AC. It does not work with line (high) voltage or millivolt systems

Step 5: Grab your smartphone and take a picture of your old thermostat wiring.
 

Step 6:
1. Disconnect the old thermostat wires one by one and mark them using the wire labels (included in the box).

2. Remove the mounting plate of your old thermostat. 

Step 7: Optional: You may use the provided wall plate to hide marks or holes on the wall left by your old thermostat installation.

Step 8:
1. Take out the labeled wires through the hole in the middle of the Cielo Smart Thermostat backplate. 

2. Screw in the backplate using the provided pair of drywall anchors and screws.

Step 9: Do you have more than one R-Wire? (That includes R, RC, and RH)

                                                                                    Yes?

   Insert your wires:  RH > RH      R or RC > RC

    No?

Insert your single R, RC, or RH wire into the RC terminal.

Step 10: Insert the remaining wires into their corresponding terminals from the side (press terminal block buttons for ease of insertion).

Step 11: Gently push the excess wires back into the center hole of the backplate to ensure that no drafts are coming from the hole.

Step 12: Align your Cielo Smart Thermostat with the backplate and press gently to fix it properly. 

Step 13: Go to your HVAC system and turn on the power from the master switch or circuit breaker.

Step 14: Welcome screen is displayed on Cielo Smart Thermostat! Follow the on-screen instructions to set up your thermostat.

All Done! Enjoy your smart home climate control. 

Troubleshooting 

If your Cielo Smart Thermostat doesn’t turn on, please try these steps: 

1. Close your HVAC panel properly, as some systems may not work if the panel isn’t fully closed.

2. Check the backplate wire connections and ensure they are inserted properly into the terminals.

3. In the case of one R-Wire, make sure it is inserted into the RC terminal. 

• R or RC or RH > RC 

In case of more than one R-Wire, make sure RH is inserted into the RH terminal and RC or R is inserted into the RC terminal. 

4. If you installed the C-Wire Adapter, ensure all wires are connected to the correct terminals on your thermostat.

•  R or RC > RC
•  G > C 
•  Y/Y1 > CWA