A
RUVG
MANUAL
30 of 35
June 14
IGNITION
CONTROL
1.
Draft
inducer
will
run
for
a
15
second
pre
‐
purge
period.
2.
At
the
end
of
the
pre
‐
purge
the
direct
spark
will
be
energized
and
gas
safety
shutoff
valve
will
open
and
if
provided
the
flow
ratio
valve
will
move
to
the
light
off
position.
3.
There
is
up
to
a
10
second
trial
for
ignition
to
light
the
burner.
During
this
time
the
direct
spark
is
energized
and
the
gas
valve
is
open.
4.
If
ignition
does
not
occur
on
the
first
trial,
the
gas
and
spark
are
shut
‐
off
by
the
ignition
control
and
the
control
enters
an
inter
‐
purge
period
of
15
seconds,
during
which
the
draft
inducer
continues
to
run.
5.
At
the
end
of
the
inter
‐
purge
period,
another
trial
for
ignition
will
be
initiated.
6.
Control
will
initiate
up
to
three
ignition
trials
on
a
call
for
heat
before
lockout
of
control
occurs.
7.
On
the
initial
start
‐
up,
or
after
unit
has
been
off
long
periods
of
time,
the
first
ignition
trial
may
be
unsuccessful
due
to
need
to
purge
air
from
manifold
at
start
‐
up.
8.
If
the
ignition
control
has
locked
out.,
clear
the
lockout
by
turning
the
service
switch
off
for
5
minutes
then
retry.
UNIT
SHUT
‐
DOWN
INSTRUCTIONS
Service
Shut
Down
1.
Set
the
thermostat
in
the
“OFF”
position.
2.
Close
the
manual
firing
valve
in
the
manifold
on
gas
fired
heaters.
3.
If
the
unit
was
firing
at
the
time
of
shut
down
allow
the
main
blower
to
run
for
a
sufficient
period
to
cool
off
the
heat
exchanger.
4.
Set
the
unit
“ON
‐
OFF”
toggle
switch
to
the
“OFF”
position.
5.
Set
the
main
power
disconnect
switch
to
the
“OFF”
position.
CAUTION:
If
the
unit
is
to
be
off
for
an
extended
period
of
time,
close
the
manual
shut
off
valve.
Emergency
Shut
Down
1.
Set
the
electrical
disconnect
switch
to
the
“OFF”
position.
2.
Close
the
main
manual
firing
valve
in
the
manifold
on
gas
fired
heaters.
Start
‐
Up
After
Extended
Shut
‐
Down
Period
When
unit
is
shut
down
for
an
extended
period
of
time
the
same
start
‐
up
procedures,
as
outlined
in
previous
sections,
should
be
followed.
