44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
website: https://www.add-furnace.com/ โทร: 02-888-3472
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7
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3
P
ur
g
e
In the case of multiple burner applications, burners
with forced air supply are used. The air for combustion
and pre-purge is supplied by a central fan controlled
by a separate logic. This logic determines the purging
time and controls an external relay that switches the air
valve to purge.
The automatic burner control unit must not be activat-
ed during purging. This is achieved by interrupting the
safety interlock, amongst other methods.
7
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4
E
m
er
g
e
n
c
y
s
t
o
p
i
n
t
h
e
eve
n
t
o
f
fi
re
or
electric shock
If there is a risk of fire, electric shock or similar, inputs
L1, N and 3 (start-up/safety interlock signal) of the IFD
should be disconnected from the electrical power sup-
ply.
Important!
This should be reflected in the wiring on
site!
7
.
5
E
m
er
ge
nc
y
s
t
op
t
r
i
gge
re
d
b
y
s
af
e
t
y
interlock
The safety interlock turns off the power to the input 3
(start-up/safety interlock signal), such as in the event of
air deficiency or similar.
7
.
6
O
ver
l
o
ad
pr
o
t
e
c
t
i
on
To protect the unit against overload by frequent cycling,
only a specific number of start-up attempts can be car-
ried out by the IFD. The maximum number of start-up
attempts per minute depends on the safety time t
SA
and the ignition unit.
If too many start-up attempts are made, flashes on
the display to indicate a fault.
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