What is a bimetal switch?
A bimetal switch changes its switching status relative to the temperature. If the temperature is sufficient, the bimetal bends, thereby actuating a snap-action switch. This switch can open or close a circuit and in so doing start or stop a process (e. g. heating, cooling, pumping).
What is a snap disc switch?
Snap Disc, or snap switch thermostats are bimetal mechanical thermostats that function via the thermal expansion and contraction of a bimetal disc that “snaps” from a convex to a concave shape at a set temperature. When the disc “snaps”, it either completes or interrupts a circuit.
How do I get my White Rodgers thermostat off hold?
When your White Rodgers Thermostat is stuck on hold, your HVAC system is set on a particular temperature permanently until you cancel the hold. To get your White Rodgers Thermostat off of the Hold mode, you need to press and hold the “Run Schedule” button.
What is a bimetal thermostat?
Bimetal Thermostats, which regulate the temperature inside heating pads, blankets, and medical pads, are used in any case where the applications need control for a low temperature. Bimetal Thermostats use two different kinds of metal to regulate the temperature setting.
What happens when a bimetal device is heated?
The strip consists of two strips of different metals which expand at different rates as they are heated. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature.
How do you adjust a bimetal thermostat?
Pull off the thermostat cover and set the thermostat to a few degrees above room temperature. Slip the wrench onto the nut behind the coiled bimetallic element, hold the dial firmly, and turn the wrench until the mercury breaks contact. (The direction you’ll need to turn the nut varies between models.)
How do you reset a White-Rodgers thermostat after changing the battery?
The most common method of resetting the White-Rodgers Thermostat is by pressing down on the Up or Down arrow and the Time button at the same time until the display goes blank on your White-Rodgers Thermostat. This usually takes 15 seconds.
Why does my thermostat say hold?
This is where the “Hold” button on your thermostat comes into play. By pressing “Hold”, your thermostat will lock in the temperature it’s currently at until you change it again. When you are ready for your normal schedule to resume, simply press the “Run” button and return to your typical programming.
How do I test a disc with a multimeter?
If your switch(es) passed the first test, remove it from the stove and heat the front (metal disc) with a heat gun, a lighter, or a hairdryer while holding the probes on the posts. As the switch heats, there should be a “snap” sound and the multimeter should display the opposite reading from when the switch was cool.