Honeywell S8610U Installation Instructions Manual page 15

S T A R T
TURN OFF GAS SUPPLY.
TURN THERMOSTAT
(CONTROLLER) TO CALL
FOR HEAT.
POWER TO MODULE.
(24V NOMINAL)
CHECK AT TH-W TERMINAL,
AND ALSO AT 24V TERMINAL
IF A VENT DAMPER IS
CONNECTED TO THE
DAMPER CONNECTOR.
YES ^
SPARK ACROSS
IGNITER/SENSOR GAP?
YES
'
TURN ON GAS SUPPLY.
PILOT BURNER LIGHTS?
YES
SPARK STOPS WHEN
PILOT IS LIT?
YES
MAIN BURNER LIGHTS?
YES
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS?
YES
r
CALL FOR HEAT ENDS.
SYSTEM SHUTS OFF?
I
YES
TROUBLESHOOTING
Repeat procedure until troublefree operation is obtained.
ENDS.
S8610U UNIVERSAL INTERM ITTENT PILO T MODULE
NOTE: Before troubleshooting, familiarize yourself with the startup and checkout procedure.
Check line voltage power, low voltage transformer, limit controller, thermostat (controller) and wiring. Also,
check air proving switch on combustion air blower system (if used) and verify that vent damper (if used) is open
and end switch is made.
Pull ignition lead and
check spark at module.
Spark okay?
YES
Check ignition cable, ground wiring, ceramic insulator and gap, and correct.
Check boot of the ignition cable for signs of melting or buckling. Replace cable and take protective action
to shield cable and boot from excessive temperatures.
Check that all manual gas valves are open, supply tubing and pressures are good, and pilot burner orifice
is not blocked.
Check electrical connections between module and pilot operator on gas control.
Check for 24 Vac across PV-MV/PV terminals on module. If voltage is okay, replace gas control; if not,
replace module
Check continuity of ignition cable and ground wire.
Clean flame rod.
Check electrical connections between flame rod and module.
Check for cracked ceramic flame rod insulator.
Check that pilot flame covers flame rod and is steady and blue.
Adjust pilot flame.
If problem persists, replace module.
Check for 24 Vac across MV-MV/PV terminals. If no voltage, replace module.
Check electrical connections between module and gas control. If okay, replace gas control or gas
control operator.
Check continuity of ignition cable and ground wire.
NOTE: If ground is poor or erratic, shutdowns can occur occasionally even though operation is normal
at the time of checkout.
Check temperature at igniter-sensor insulator. High temperatures can cause a short.
Check that pilot flame covers flame rod and is steady and blue.
If checks are okay, replace module.
Check for proper thermostat (controller) operation.
Remove MV lead at module; if valve closes, recheck temperature controller and wiring; if not, replace
gas control.
Fig. 7. S8610U Troubleshooting Guide.
15
On models with vent damper plug, make sure vent damper
was not installed, then removed. Replace vent damper,
if necessary.
On other models, replace module.
M2643B
69-0729—3