SECTION 22—TIMING
Part No 1164934
73
Perfecto
2
™
V
SECTION 22—TIMING
DANGER
To
prevent
electrical
shock,
ALWAYS
disconnect
concentrator
from
electrical
outlet
before
servicing.
Use
extreme
care
when
making
adjustments
to
the
timing
switch.
DO
NOT
allow
screwdriver
or
your
hands
to
contact
the
P.C.
Board
when
unit
is
plugged
in
and/or
on.
Turn
unit
off
and
unplug
before
adjusting
timing
switch.
Electrical
shock
is
possible.
To
accommodate
the
varying
tolerances
when
replacing
components,
an
adjustable
timer
is
used
to
control
the
shift
time
of
the
pressure
equalization
(P.E.)
valve.
The
SensO
2
board
allows
for
automatic
(microprocessor
controlled)
adjustments
of
the
P.E.
shift
times.
Non
‐
SensO
2
boards
allow
for
manual
adjustment.
Autotuning
WARNING
DO
NOT
push
the
autotune
button
while
powering
up.
Otherwise,
the
factory
settings
will
be
erased.
NOTE:
For
this
procedure,
refer
to
FIGURE 22.1
on
page 74.
1. Turn
power
off
( )
and
unplug
the
unit.
2. Remove
cabinet.
Refer
to
Removing
Cabinet
on
page 23.
3. Plug
the
unit
in
and
turn
the
power
on
( ).
4. Locate
the
P.C.
board.
5. Wait
for
the
main
valve
shift
to
indicate
one
of
the
following:
• If
the
P.C.
board
is
new,
the
front
panel
RED
indicator
light
will
slowly
blink,
indicating
autotune
has
initiated.
• If
the
P.C.
board
is
used
and
has
performed
autotuning
before,
press
and
release
the
small
push
button
on
the
P.C.
board.
The
front
panel
RED
indicator
light
will
slowly
blink,
indicating
the
unit
is
autotuning
and
automatically
adjusting
the
P.E.
valve
timing.
6. Set
the
output
flow
to
5.0
L/min.
7. The
GREEN
(onboard)
diagnostic
light
will
flash
the
current
value
of
the
P.E.
valve
timing
number.
8. Place
the
cover
back
on
the
unit
but
DO
NOT
install
the
cover
screws.
Let
the
unit
run
until
autotuning
is
completed.
9. When
autotuning
is
complete,
the
RED
front
panel
indicator
light
will
change
from
a
slow
blinking
to
a
flashing
of
the
final
P.E.
valve
timing
number.
/O
I
