- Shut off the power to your heating and/or cooling systems
This will protect your hvac equipment.
- If you are replacing a mechanical unit, you can now remove the cover and/or unit to get to the wire connections.
On some units this is accomplished by loosening two or three tiny screws. Some units will have to be removed from the wall to expose the wire connections. Digital units usually just snap off the mounting base.
- Write down the terminals and the color of wire attached to them
** HOT TIP** Watch out for two or more wires that are the same color. This is rare but it is possible that you will see it. If this is the case, make sure you mark the wires in another way.
- If you didn't have to do so to get to the terminals, now you can remove the old base from the wall.
This is usually done by removing two or three screws.
- Mount the new base in its place
Most new units come with plastic drywall anchors to mount them. Next, reattach the wires to the terminals. Be sure to put them back exactly like they were on the old one.
** HOT TIP** You should seal the hole in the wall where the wires come through. This can be done with silicone, putty, etc. Make sure you do not get it on the terminals. If this is not done, drafts can come through the wall affecting the accuracy of the unit. This is rarely done even by professionals.
- You may need to set switches or program the unit to tell it what type of system you have
Read the instructions provided with it to be sure.
- Put the unit on its base
Most of them snap on but some are held with small screws.
- Turn the power back on to your heating and/or cooling systems.
You can verify proper operation and program according to the instructions. Most units have the instructions printed on a label inside the cover.