Intermittent hot surface pilot ignition, 1/2 X 1/2-inch National Pipe Thread (NPT). SmartValve™ system controls provide easy field replacement of wide range of SV9500, SV9501, SV9502 and SV9602 SmartValve™ system models. Gas appliance manufacturers use these models in many types of gas-fired heating appliances including central furnaces, residential boilers, rooftop furnaces, commercial cooking appliances, and unit heaters, to provide intermittent pilot gas ignition sequencing, pilot flame sensing, and both pilot and main gas control functions in single control. They are directly compatible with Q3450 or Q3480 intermittent pilot burners used with original controls on appliance. Suitable for wide range of gas-fired appliances including residential furnaces, roof-top furnaces, residential boilers, unit heaters, infrared heaters, space heaters and commercial cooking units. Ignition sequence includes timed trial for ignition.