13

The safety lockout timer circuit starts timing the moment the trial for pilot ignition starts. W hen the timing period runs
out, the trial for ignition ends, and the control module goes into lockout. Before another attempt to start can be m ade,
the S86 must be reset. Reset by adjusting the thermostat or contr oller or to its "OFF" position. An alternate method is
to shut the system power "OFF". If normal ignition does not occur, use the trouble shooting table to determine the
problem.
SERVICE
PRELIMINARY CHECK
The following visual checks should be made before trouble shooting and after installation or maintenance.
1. Check power to appliance and S86.
2. Manual shutoff cocks in gas line to appliance must be open.
3. Make certain all wiring connections are clean and tight.
4. First de-energize the system and wait at least one (1) minute. T his resets the module allowing a return to start
condition. Then energize the system.
5. Review the S86 system normal sequence of operation.
SYSTEM TROUBLE SHOOTING
Start the system by setting the thermostat or controller above required temperature. Observe system response.
Establish type of malfunction or deviation from normal operation. Use the S86 Intermittent Pilot System Trouble
Shooting Table to check for normal system operation.
Use table by following instruction questions in box. If the condition is true or okay (answer yes), go down to next box
underneath. If the condition is not true or not okay (answer no), go right to the next box alongside. Continue checking
2222
SPARK GENERATOR POWERED
First valve (pilot) operator opens
3333
PILOT BURNER OPERATION
Pilot burner lights.
Module senses flame
current.
OR Pilot burner does not light.
After 90 second
a
system
locks out; must be manually
reset.
a
Shutoff/lockout timing is stamped on module.
4444
FLAME CURRENT SENSED
•
Spark generator off.
•
Second valve operation (main) opens.
5555

MAIN BURNER OPERATION
Module monitors pilot flame current.
6666
THERMOSTAT (CONTROLLER) SATISFIED
Valves close, pilot and main burners are off.
1111

THERMOSTAT (CONTROLLER) CALLS
FOR HEAT

POWER INTERRUPTION
System shuts off, restarts
when power is restored.
PILOT FLAME FAILURE
Main valve closed.
Module starts trial for ignition.

START

STAGE 1

TRIAL FOR

IGNITION

STAGE 2

MAIN BURNER

OPERATION

END