2-5
Chapter 2. MOUNTING AND WIRING
CAUTION
Do not configure a circuit that turns off the interlock input (terminals 17-18) using the alarm
output contacts (terminals 11-12). With such a circuit, if a false flame, UV alarm, ignition failure,
or flame failure occurs, the interlock alarm may be displayed.
Firmly tighten the terminal screws to the torque listed in the specifications.
If there is a risk of a power surge caused by lightning, use a surge absorber (surge protector).
If there is an inverter or the like that generates strong electrical noise near this device, take
noise-suppression measures, referring to the user’s manual for the noise-generating equipment.
Wiring diagram
WARNING
Never short-circuit the start contact in order to start and stop this device by switching the power
on and off. This is very important for reliable activation of the self-check circuit at device startup.
Failure to observe this warning could lead to an explosion.
Note
Wiring for input to terminals 15 and 18
through (H) contacts, without using
terminals 16 and 17, is also possible.
(G)
F G
AUD300C/500C
(H)
(G)
AUR450C
Advanced Ultraviolet
White
White
Yellow
Blue
Unused
Alarm output
External reset
input
Shut-
ter
Power supply
Main valve
Intermittent pilot valve
Interrupted pilot valve
Ignition transformer
Flame monitor
output
Interlock
input
Start
contact
input
Interlock
input
Start
contact
input
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
15
16
17
18
Handling Precautions
•
If the power source has a voltage side (H) and a ground side (G), connect the
voltage side (H) to terminal 13 and the ground side (G) to terminal 14.
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