1701ULTRA(EC)GBEN, p. 21/29
Ignition system – time table
Definitions
Start
position
Pre
‐
purge
time
Safety
time
Post
‐
purge
time
The
system
is
not
in
lock
‐
out
position
and
can
proceed
with
the
start
‐
up
sequence
upon
a
demand
for
heat.
This
is
a
period
of
20
sec
during
which
the
combustion
fan
operates
prior
to
activation
of
the
ignition
device.
The
safety
time
is
the
delay
between
the
gas
valve
being
energised
and
the
flame
sensor
checking
for
the
presence
of
a
flame.
This
is
a
period
of
5
seconds.
Note
:
if
no
flame
is
sensed,
the
burner
relay
will
attempt
ignition
5
times
before
going
into
lock
‐
out
mode.
This
is
the
time
of
10
seconds
between
burner
shut
‐
down
and
the
moment
the
combustion
fan
(venter)
is
de
‐
energized.
