Utica Boilers JE 安装指导
35
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Pull ignition lead and
check spark at module.
NOTE: Before troubleshooting, familiarize yourself with startup and check
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 that vent damper (if used) is open and end switch is made.
Spark Across Igniter/Sensor Gap.
Spark okay?
Turn gas supply OFF. Turn thermostat
(controller) to call for heat.
Power to module (24V module)
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On models with vent damper plug,
make sure vent damper has not been
installed, then removed. Replace vent
damper if necessary.
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On other models, replace module.
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Turn gas supply ON.
Pilot Burner Lights?
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Check ignition cable, ground wiring, ceramic insulator and gap, and correct.
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Check boot of the ignition cable for signs of melting or bucking. Take protective
action to shield cable and boot from excessive temperatures.
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Check that all manual gas valves are open, supply tubing and pressures are
good, and pilot burner orifice is not blocked.
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Check electrical connection between module and pilot operator on gas control.
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Check for 24 Vac across PV-MV/PV terminals on module. If voltage is okay,
replace gas control: if not, replace module.
NOTE: If the control, goes into lockout, reset system.
Spark Stops When Pilot Lit?
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Check continuity of ignition cable and ground wire.
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Clean flame rod.
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Check electrical connections between flame rod and module.
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Check for cracked ceramic flame rod insulator.
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Check that pilot flame covers flame rod and is steady and blue.
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Adjust pilot flame.
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If problem persists, replace module.
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Main Burner Lights?
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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.
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Check that pilot flame covers flame rod and is steady and blue.
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If checks okay, replace module.
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Check for 24 Vac across MV-MV/PV terminals. If no voltage, replace module.
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Check electrical connections between module and gas control. If okay, replace
gas control or gas control operator.
NOTE: If the control, goes into lockout, reset system.
System Runs Until Call For
Heat Ends.
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Call For Heat Ends
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System Shuts OFF?
Troubleshooting Ends.
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Check for proper thermostat (controller) operation.
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Remove MV lead at module: if valve closes, recheck temperature controller and
wiring: if not, replace gas control.
Repeat procedure until trouble free operation is obtained.
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PILOT SYSTEM TROUBLESHOOTING TABLE