14
IMPORTANT: The electronic S8600 control Module cannot be repaired. If troubleshooting procedure indicates a malfunction in
the S8600, the control Module must be replaced. Intermittent pilot systems should be serviced only by trained
and experienced personnel.
SEQUENCE OF OPERATION
1
THERMOSTAT (CONTROLLER)
CALLS FOR HEAT
2
SPARK GENERATOR
powered by First Valve (pilot) operator opens
4
FLAME CURRENT SENSED
• Spark generator off
• Second valve operator (main) opens.
4
MAIN BURNER OPERATION
Module monitors pilot flame current.
4
THERMOSTAT (CONTROLLED)
SATISFIED
Valves close, pilot and main burners are off.
3
PILOT BURNER OPERATION
Pilot burner lights.
Module senses
flame current.
OR
Pilot burner does not light
Module
Response
S8600A,F
Ignition spark continues, pilot valve remains
S8610A, F
open until system is reset
S8600B, H
After 15 or 90 sec. a system
S8610B, H
lock outs; must be manually reset
S8600M
After on sec. a system shuts off; after 5 minutes
min. (6 minutes nom.), module restarts trial for
ignition; ignition trial, shutoff, wait sequence
repeats until pilot lights or call for heat ends.
a Shutoff/lockout timing is stamped on module
POWER INTERRUPTION
System shuts off, restarts when power is
restored.
PILOT FLAME FAILURE
Mail valve closes.
Module starts trial for ignition.
START
STAGE 1
TRIAL FOR
IGNITION
STAGE 2
MAIN BURNER
OPERATION
END
WIRING DIAGRAM LADDER FORM
WIRING DIAGRAM HONEYWELL EP SYSTEM
S86
FLAME
DETECTOR
CIRCUIT
RELAY
COVERS
TIMING
CIRCUITS
