Troubleshooting Guide Of Direct Spark Ignition System - Space-Ray LTU SERIES Installation And Operation Instructions Manual

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TROUBLESHOOTING GUIDE OF DIRECT SPARK IGNITION SYSTEM

–START–
TURN GAS SUPPLY ON. SET
THERMOSTAT TO CALL FOR HEAT.
Power To Control Module?
(25 vac nominal)
Yes
Ignition Module 30-Second
Delay For Prepurge?
Yes
Spark Across Igniter or
Igniter/Sensor Gap?
Yes
Main Burner Lights?
Yes
Spark Stops when Burner
is Lit?
Yes
System Runs Until Call
for Heat Ends?
Yes
Call for Heat Ends and
System Shuts Off?
No
No
Υ
Υ
No
No
No
No
No
–END TROUBLESHOOTING–
REPEAT PROCEDURE UNTIL TROUBLE-FREE OPERATION IS OBTAINED.
Υ
Check line voltage.
Υ
Low voltage transformer.
Υ
Thermostat and wiring.
Υ
Diaphragm air switch.
Check fuse and replace if necessary.
Replace module if fuse checks okay.
Υ
Turn off gas supply.
Υ
Pull ignition leads and check spark at ignition stud.
Spark Okay?
Yes
Υ
Check ignition cable, ground wiring, ceramic insulator and gap
(3/16") and correct.
Υ
Check boot of the ignition cable for signs of melting or buckling.
Υ
Check for 25 vac across valve and valve terminals on ignition
module. If no voltage, replace module.
Υ
Check electrical connections between ignition module and gas
control. If okay, replace gas control.
NOTE: If module goes into lockout, reset system.
^
Υ
Check continuity of sensor cable and ground wire.
Υ
Check that burner flame covers electrode.
Υ
If checks are okay, replace ignition module.
NOTE: If module goes into lockout, reset system.
^
Υ
Check continuity of sensor cable and ground wire.
NOTE: If ground is poor or erratic, shutdowns may occur occasionally
even though operation is normal at time of checkout.
Υ
Check that burner flame covers electrode.
NOTE: Temperature above 1000ºF (538ºC) causes short to ground.
Υ
If checks are okay, replace ignition module.
Υ
Check for proper temperature controller operation.
Υ
Remove valve lead at module. If valve closes, recheck
temperature controller and wiring. If not, replace gas control.
–40–
No
Form #43155260
Mar–05