5-1
Chapter 5. MAINTENANCE AND INSPECTION
WARNING
Before wiring, mounting, or removing this device, be sure to turn the power off. Wiring with the
power on can result in an electric shock.
Terminals and the connected flame detector signal cable retain an electrical charge even after
the power is turned OFF. To avoid electric shock, do not touch terminals F and G or the cable
immediately after power-off.
CAUTION
Installation, wiring, inspection, adjustment, etc. should be carried out by a trained and
experienced technician who has knowledge and technical skills related to combustion
equipment and flame safeguard control devices.
If the safety shutoff has been activated, check all of the items on the checklists in chapter 4,
TRIAL-RUN ADJUSTMENT before restarting the equipment.
When doing a maintenance inspection of the burner, be sure to do the pilot turndown test.
Inspection must be done at least once a year.
Conduct periodic inspections in accordance with the user’s manual of the equipment
manufacturer.
When cleaning the burner, clean the flame detector as well.
Frequency of maintenance and inspection
Determine an appropriate frequency for maintenance and inspection work by
considering
•
the equipment type
•
ambient conditions (dust or temperature) of the location
•
damage or negative effects if the burner is shut off
for some reason during operation of the equipment.
Inspections Inspection frequency
Safety shutoff test (for details, refer to;
Chapter 4. TRIAL-RUN ADJUSTMENT).
Once a month or more
Contamination of monitoring window and sighting pipe of
AUD300C/500C
Once a month or more
Measurement of flame voltage Once a month or more
Pilot turndown test Once a year or more
Handling Precautions
•
If unintended burner shutoff may cause a serious problem, perform the in-
spection more frequently.
•
If the burner manufacturer provides specific instructions about maintenance
and inspection, always strictly observe them.
•
Always use IV wire with a cross-sectional area of 0.75 mm
2
or more for flame
voltage output. The wire length must be 10 m or less.
A measuring instrument connected to this device should have an input
impedance of 100 kΩ or more.
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