2-4
Chapter 2. MOUNTING AND WIRING
2-2 Wiring
WARNING
Connect loads (ignition transformer, solenoid valve, etc.) directly to the output terminals of this
device. Otherwise, combustion safety cannot be ensured.
When using an auxiliary relay due to lack of contact capacity, etc., take protective measures in
case a relay malfunction or contact welding occurs.
Do not extend the lead wires of the reset input for more than the allowable length of 10 meters.
Always input the reset command from beside the combustion equipment, not from a remote
location. Because a safety check cannot be made far from the equipment, there is an increased
risk of explosion.
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.
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.
Make sure the load connected to each terminal does not exceed the rating indicated in the
specifications.
If timers and auxiliary relays are needed for additional functions, select ones with high reliability,
and be sure to design the circuit correctly.
When installing and wiring, be sure to follow the instructions in this manual and in the user’s
manual for the combustion equipment.
Run the high-voltage ignition transformer cable separately and keep it at least 10 cm away from
this device.
Keep power lines and ignition transformer high-voltage cables separate from the AUD300C/500C
cables and from the external reset input cable.
Make sure that ignition transformer high-voltage cables are properly connected to prevent faulty
contact. Faulty contact might generate highfrequency radio waves which can cause malfunction.
Always connect the power supply last. Otherwise, touching a terminal accidentally could result in
electric shock or damage.
Always supply electric power at the voltage and frequency stated on the model label of this
device.
In keeping with technical standards for electrical equipment, the burner body must have an earth
ground connection with a resistance of less than 100 .
After the wiring is complete, be sure to check that it is correct. Incorrect wiring may cause damage
or faulty operation.
Do not short the control load terminals (18-19, 18-20, 18-21, or 18-22) or the shutter terminals (7-
8). Internal fuses between these terminals will burn out if these terminals are shorted.
If a fuse burns out, replace the entire product.
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