Johnson Controls G76 Series Installation Sheets Manual page 8

Spark Electrode
and Sensor
Assembly
8 G—G76x Direct Spark Ignition Controls Technical Bulletin
Instructions for installing the spark electrode and sensor assembly are
typically provided by the appliance manufacturer. It is important to follow
those instructions. If such information is not included, use the following
basic instructions.
Location/Mounting
The spark electrode and sensor assembly must be positioned for easy
access and securely mounted to the main burner to ensure that the
assembly remains properly positioned with respect to the main burner
flame. The main burner flame must engulf at least 9.52 mm (3/8 in.) of the
flame sensor. If a separate flame sensor is used, keep the sensor wire as
short as possible and do not rest it against grounded metal surfaces.
Standoff insulators are recommended.
The spark electrode, flame sensor, and G76x must share a common ground
with the main burner to operate correctly. Thermoplastic insulated wire
with a minimum rating of 105°C (221°F) is recommended for the ground
wire. Ensure that the flame sensor wire and the high voltage spark
transformer wire are separated from one another by a minimum distance of
6.35 mm (1/4 in.) and are not wrapped around any pipe, other wiring, or
accessory.