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An ouside air temp changeover thermostat. lc

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Q: What causes heat pump system switch to backup heat?
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What causes a dimmer switch to heat up?

Lower levels of light are what causes the dimmer switch to heat up. The extra electricity that is not being used when the light is lowered is sent to the circuitry of the dimmer switch. The heating up is normal.


How can a solar heating system heat your water when there is no sun?

The panals store energy and save it as a backup if their is no sun.


The addition of heat energy to a system always causes the temperature of that system to increase.?

Yes. Adding heat will increase temperature.


What causes pressure in a radiator?

Expansion of the water inside due to heat causes the system to be pressurised.


Why does antifreeze backup into the overflow tank?

Heat from the engine causes liquid to expand. It used to overflow onto the ground if it caused enough pressure to open the radiator cap. The overflow tanks were installed to automatically catch and return the coolant to the cooling system.


Hvac limit switch?

limit switch on hvac used to cut off low voltage on heating when system over heat limit


What is the best backup heat in case of power failure?

One of the best things to do for backup heat in case of a power failure is to convert a fireplace to propane.


What directly causes mechanical motion?

The application of HEAT, in any of it's Forms; heat to overcome Inertia.


Is a heat pump cheaper to run than a oil heater?

Yes depending on electrical rates in your area , but you will need a backup system to provide heat when the outdoor temps get below 35* or so where a heat pump is ineffective. This is commonly called a Dual Fuel system. Many people do this.


How does heat lead to expansion?

Heat causes the particles of a substance to move faster, thus causing the internal pressure of the system to rise.


Which setting should iuse on electric thermostat heat or em heat what is difference?

On a system that uses a Heat pump, the heat setting utilizes the pump, and electrical coil heating as a backup. On the EM setting the heat pump won't run, only the axillary coils will provide heat.


Is a heat pump electric or gas?

All the heat pumps that I know of are electric. Some may have gas backup-- in very cold conditions , heat pump will not work, so some kind of backup is needed.