Johnson Controls G77 Series Installation Sheets Manual page 7

Electrical
Connections
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 Figures 3 through 7 for wiring diagrams. 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 the high voltage spark transformer cable are separated from
one another a minimum of 6.35 mm (1/4 in.) and not wrapped around any
pipe, other wiring, or accessories.
All manuals and user guides at all-guides.com
!
CAUTION: Equipment Damage Hazard. Connect the high
voltage cable to the spark transformer terminal and
spark electrode (pilot burner assembly) before
applying power to the control. Be certain the ground
wire is attached to the pilot burner and 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.
GG77x Intermittent Pilot Ignition Controls Technical Bulletin 7