37
Chapter 6. Maintenance and Inspection
Failure inspection flowchart
WARNING
Before removing, mounting, or wiring this device, be sure to turn off the power to this device
and all connected devices. Failure to do so may result in electric shock.
If there is a problem with the combustion equipment, follow the inspection procedure below.
Power switch ON
Did flame LED
turn OFF?
Did flame LED
turn ON?
Did shutter LED
turn OFF?
Is flame voltage
correct?
• Change voltage to within the allowable range
• Check limit and stop switches
• Check power supply and its wiring
• Check burner ignition
(pilot turn-down test)
• Check wiring
• Check shutoff valve
• Check ignition transformer
• Check pilot burner
• Check wiring
• Check flame monitoring position
• Check the AUR355
• Check ignition transformer
• Check pilot burner
• Check wiring
• Check the view from the flame monitoring pipe for a light source causing false flame
• Check flame voltage level
• Check the AUR355
Check the AUR355
• Check the AUD300C/500C
(UV tube self-discharge, bent shutter blade, etc.)
• Check flame voltage level
• Check the AUR355
Normal
Is voltage
(terminals 2–3)
within range?
Ignition switch ON
No
No
No
Did pilot burner
ignite?
No
No
No
No
Yes
Yes
Yes
Yes
Ignition switch OFF
Did main burner
ignite?
Yes
Yes
Yes
To Next Page
Loading...
