Utica-Dunkirk 240013045 SPST Pressure Switch 0.4" WC

The Utica-Dunkirk 240013045 Pressure Switch is a single-pole, single-throw pressure-activated safety control that is used in HVAC systems to sense air or gas pressure and switch an electrical circuit on or off at a predetermined set point of 0.4 inches of water column. It is fitted in furnaces and boilers where the adequate draft or air supply must be ensured before ignition or blower may be started. It control sequence the system assists in making sure that the conditions of combustion and ventilation are within the operational requirements before the appliance continues with heating.