Johnson Controls G76 Series Installation Sheets Manual page 7

Electrical
Connections
!
CAUTION: Equipment Damage Hazard. Connect the high
voltage cable to the spark transformer terminal and
spark electrode before applying power to the control.
Ensure that the ground wire is attached to the sensor
assembly and the ignition control ground terminal
strip.
!
CAUTION: Equipment Damage Hazard. Locate all limit and
operating controls in series with the thermostat
terminal (THS 2) on the ignition control.
Check the voltage rating marked on the control and make sure it is suited
to the application. Use a National Electrical Code (NEC) Class 2
transformer to provide 24 VAC under maximum load, including valves.
A transformer having excessive primary impedance due to poor coupling
will affect the ignition potential.
Refer to Figure 3 for wiring diagram. All wiring should be in accordance
with the NEC and all other local codes and regulations. The high voltage
spark transformer cable must not be in continuous contact with a metal
surface. Use standoff insulators. Ensure that the flame sensor wire and
high voltage spark transformer cable are separated from one another by a
minimum of 6.35 mm (1/4 in.) and are not wrapped around any pipe, other
wiring, or accessory.
Main Burner
Ground
GROUND
5
LED
THS 2
M.V. 3
SENSE 4
G76x Ignition Control
Figure 3: Wiring Diagram for G76x Ignition Controls
G—G76x Direct Spark Ignition Controls Technical Bulletin
Spark Electrode/
Sensor Assembly
Main
Main
Valve Valve
Limits in
Thermostat
Thermostat
Line Only
Power
Supply
Transformer
7