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More Info. |
Most of the questions I've been asked to date are about thermostats so I've decided to add this page to the site. A thermostat is basically a thin strip of two different metals bonded together (bi-metallic strip). The bottom metal expands faster than the top one when heated. This means that as the temperature rises, the strip becomes curved. If a contact is positioned under the strip, the strip will curve away from it, breaking the circuit (Normally closed contact). Similarly, if a contact is placed above the strip, the strip will curve towards it, making the circuit (Normally open contact). Adjusting the heat requirement knob moves the contacts in relation to the strip.
This system works fine for cylinder and pipe thermostats. A room thermostat however needs to operate at a lower temperature. In order to use the same strip, manufacturers put in a heating resistor to raise the temperature into the same range. This requires a neutral supply as well as the live supply to the common terminal.
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