How does an old thermostat work?
How does an old thermostat work?
An electromechanical thermostat typically contains either a bi-metal coil or a metal strip. When the temperature changes, this coil or strip will move, causing a vial containing mercury to tip to one side. The mercury flows to one end of the vial, signaling that the heating or cooling needs to be turned on.
Why is my old thermostat not working?
Try replacing the batteries, then check for a blown fuse or tripped breaker in the electrical panel. If the thermostat is still unresponsive, make sure the breaker is shut off and remove the cover. If the wiring looks corroded, consider replacing the thermostat.
How does a 2 stage thermostat work?
A two-stage furnace fires up the first-stage burner and in most conditions stops there. So if the house doesn’t reach the set temperature within 10 minutes, the timer automatically fires up the second stage. Unfortunately, it keeps the second stage running until the thermostat reaches the set temperature.
How do you turn off an old thermostat?
How to Disconnect a Thermostat
- Turn the electrical power off to your furnace and air conditioner.
- Remove the cover plate from your thermostat.
- Disconnect the exposed wires leading into the wall from their terminals in the thermostat.
- Unscrew the thermostat mounting case from the wall.
How do you test a Robertshaw thermostat?
To test for burned out heating elements: A) Turn power off and disconnect wires to heating element. B) Use a continuity tester (multl-meter). If test shows continuity between terminal and flange the element is burned out. No continuity between the element terminals indicates a burned out element.
Why did my thermostat go blank?
If your thermostat wall does not have a c-wire, or common wire, your thermostat most likely is not hooked up to your HVAC system for its power and needs batteries. When your screen is blank, it could indicate you need to replace the batteries. Most thermostats display a low-battery symbol when the juice is running low.
What does Stage 1 and 2 mean on my thermostat?
The second stage is the full capacity of your system. 1/3 compressor capacity is the 1st stage. 1st stage is more efficient than 2nd stage, but systems are designed to use both stages, so no worries there.
