Mercury Contacts
Some thermostats use the expanding bimetallic agreement his pipe mercury to move. How mercury moves in the tube, it comes in contact with two wires are inserted into the glass tube. When mercury is in contact with two wires, he completes the electrical circuit. This type of thermostat must be arranged so that the tube of mercury swung and can be moved expansion or contraction of a bimetallic strip that have, or releases the pressure on the tube of mercury.
Thermostats used in home air-conditioning and heating systems are now equipped with mercury contacts (see Fig. 14-17). They are made so that mercury two-wire, contact management, and air conditioning in one position and two wires to control the heating system to another position (see Fig. 14-18).
The advantage of mercury lamps type of switch is the elimination of the switch contact points. Contact points need constant attention. In most cases the dust from the air will eventually lead to their functioning. You must clear the point of running a piece of blank paper, through them, to remove particles of dust and remains of arc burning. Because mercury type sealed and sparking created to take a break and chain just causes the mercury evaporates a bit and then come back in a liquid state, provides trouble-free mode switching.
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