Johnson Controls G77 Series User Manual

G

G77x Intermittent Pilot Ignition Controls Technical Bulletin
19
Start
Does
spark stay on
after the pilot
lights?
Yes
No
No
No
End
Yes
No
Yes
Yes
No
Is sensor
cable securely
connected to Terminal 4
and flame
sensor?
Is sensor
ceramic
cracked?
Is 24 VAC
between Terminal 3
and ground?
No
Replace
control
Yes
Make sure sensor cable
and spark cable are
separated and not
wrapped around any
pipes or accessories.
Is gas
inlet pressure
per manufacturer’s
specifications?
Correct
Correct
Yes
Is main valve
wiring securely
connected to
Terminal 3
and ground?
Correct
No
Yes
Replace
main valve
Replace
flame sensor
Yes
Is
sensor cable
grounded
out?
Correct
Does
sensor cable lack
continuity or good
insulation?
No
Replace
cable
If system still fails, clean
the pilot assembly with
steel wool, or replace
flame sensor, orifice, or
control.
Figure 14: Pilot Lights, but Main Burner Does Not Come On
All manuals and user guides at all-guides.com

Johnson Controls G77 Series Specifications

General

Brand	Johnson Controls
Model	G77 Series
Category	Controller
Language	English