Fan Safety Cutoff Switch
A fan safety cutoff switch can be installed in any heating, ventilating, or air-conditioning system to control fan motor operation (see Figure 6-12). These are manually reset mercury switches that automatically break the fan motor circuit on temperature rise to the setpoint. The setpoint is established by adjusting the temperature-setting screw on the unit. This switch is designed to lock out to prevent the return of fan operation until manually reset.
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