Troubleshooting
Guide
23|
Page
ADJUSTING
MANIFOLD
PRESSURE:
The
manifold
gas
pressure
of
the
tankless
unit
can
be
adjusted
by
the
following
procedure.
Adjusting
the
manifold
pressure
can
cause
unexpected
combustion
conditions
during
operation,
which
can
cause
a
health
hazard,
damage
the
tankless
unit,
and
or
shorten
its
lifespan.
Therefore,
changing
the
manifold
pressure
is
not
recommended
unless
there
are
very
strong
reasons
to
do
so
(e.g.
high
elevation
installations),
and
with
the
consultation
of
the
Technical
Service
Department.
1)
Set
up
the
manometer
by
following
steps
1
through
4
on
the
“Checking
manifold
gas
pressure”
procedures
on
p.
21.
2)
Press
and
hold
down
the
“MIN”
button
on
the
computer
board.
While
holding
down
the
“MIN”
button,
press
either
the
“INCREASE”
or
“DECREASE”
button
to
increase
or
decrease
the
manifold
gas
pressure,
respectively
(Figure
5.18).
Refer
to
the
manometer
to
verify
that
pressure
has
been
set
to
desired
value.
3)
Now
press
and
hold
down
the
“MAX”
button
on
the
computer
board
to
change
the
maximum
burn
pressure.
4)
Repeatedly
adjust
the
minimum
and
maximum
pressures
again
until
both
levels
are
stable
and
there
are
no
more
changes
from
the
previous
iteration.
5)
After
the
manifold
gas
pressure
has
been
set,
deactivate
the
unit
(stop
all
water
running
through
the
unit),
remove
the
manometer
tube,
and
replace
the
port
screw.
RESETTING
THE
COMPUTER
BOARD:
1)
Verify
that
there
is
no
water
flowing
through
the
unit.
2)
If
a
temperature
remote
controller
has
been
installed,
turn
the
power
off
to
the
remote.
3)
Turn
off
power
to
the
unit,
and
then
turn
on
again.
4)
Push
and
hold
the
“INC”
and
“DEC”
buttons
on
the
computer
board
simultaneously
for
several
seconds
until
the
red
LED
lights
up
solid.
5)
Use
the
Power
ON
‐
OFF
switch/GFI
to
turn
the
unit
off
then
on
again.
The
computer
board
is
reset.
WARNING
Computer
board
MAX
MIN
Increase
Decrease
Figure
20
Figure
21
