Dunkirk D247 Installation Instructions Manual page 23

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TURN GAS SUPPLY OFF.
TURN THERMOSTAT
(CONTROLLER) TO CALL
FOR HEAT
POWER TO MODULE
(24V MODULE)
S8600 INTERMITTENT PILOT SYSTEM TROUBLESHOOTING TABLE
START
I NOTE: Before troubleshooting, familiarize yourself with the startup and check procedure.
Check line voltage power, low voltage transformer, limit controller, thermostat (controller) I
and wiring. Also, check air proving switch on combustion air blower system (if used) and
that vent damper (if used) is open and end switch is made. I
YES ,
SPARK ACROSS
IGNITER/SENSOR GAP
YES 1
TURN GAS SUPPLY ON
PILOT BURNER LIGHTS?
YES
1
SPARK STOPS WHEN
PILOT IS LIT?
YES
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MAIN BURNER LIGHTS?
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS
YES
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I CALL FOR HEAT ENDS
SYSTEM SHUTS OFF?
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YES J ,
TROUBLESHOOTING
ENDS
Pull ignition lead and check ,,_ _ '_ • On models with vent damper plug,
spark at module. _f make sure vent damper has not
been installed, then removed.
Spark okay? Replace vent damper if necessary.
YES Jr On other models, replace module.
¥
I • Check ignition cable, ground wiring, ceramic insulator and gap, and correct. I
• Check boot of the ignition cable for signs of melting or bucking. Take protective
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action to shield cable and boot from excessive temperatures.
• Check that all manual valves are supply tubing and are
gas open, pressures
good, and pilot burner orifice is not blocked.
• Check electrical connection 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.
NOTE: If S8600B, H goes into lockout, reset system. For S8600M, wait 6 min. nom.
for retry or reset system.
• 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 Mac 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.
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NOTE: If S8600B, H; $8610B, H goes into lockout, reset system. For S8600M, wait
6 min. nom. For retry or reset system.
• Check continuity of ignition cable and ground wire.
NOTE: If ground is poor or erratic, shutdowns may occur occasionally
even though operation is normal at the time of checkout.
• Check that pilot flame covers flame rod and is steady and blue.
• If checks 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.
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I Repeat procedure until trouble free operation is obtained.
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