Installation
5
│
Page
•
Installation
and
service
must
be
performed
by
a
qualified
installer
(for
example,
a
licensed
plumber
or
gas
fitter),
otherwise
the
warranty
by
Takagi
will
be
void.
•
The
installer
(licensed
professional)
is
responsible
for
the
correct
installation
of
your
T
‐
H2
‐
DV/T
‐
H2
‐
OS
Water
Heater
and
for
compliance
with
all
national,
state/provincial, and
local
codes.
•
The
warranty
will
not
cover
damage
caused
by
water
quality.
•
Only
potable
water
or
potable
water
/
glycol
mixtures
can
be
used
with
this
water
heater.
Do
not
introduce
pool
or
spa
water,
or
any
chemically
treated
water
into
the
water
heater.
•
Water
hardness
levels
must
not
exceed
7
grains
per
gallon
(120
ppm)
for
single
family
domestic
applications
or
more
than
4
grains
per
gallon
(70
ppm)
for
all
other
types
of
applications.
Water
hardness
leads
to
scale
formation
and
may
affect/damage
the
water
heater.
Hard
water
scaling
must
be
avoided
or
controlled
by
proper
water
treatment.
•
Water
pH
levels
must
be
between
6.5
and
8.5
•
Well
water
must
be
treated.
•
Although
the
T
‐
H2
‐
DV/T
‐
H2
‐
OS
is
designed
to
operate
with
minimal
sound,
TAKAGI
does
not
recommend
installing
the
unit
on
a
wall
adjacent
to
a
bedroom,
or
a
room
that
is
intended
for
quiet
study
or
meditation,
etc.
•
Locate
your
heater
close
to
a
drain
where
water
leakage
will
not
do
damage
to
surrounding
areas.
As
with
any
water
heating
appliance,
the
potential
for
leakage
at
some
time
in
the
life
of
the
product
does
exist.
Takagi
will
not
be
responsible
for
any
water
damage
that
may
occur.
If
you
install
a
drain
pan
under
the
unit,
ensure
that
it
will
not
restrict
the
combustion
air
flow.
•
T
‐
H2
‐
DV/T
‐
H2
‐
OS
are
high
efficiency
products
that
create
condensation.
A
condensation
drain
tube
must
be
installed
with
the
T
‐
H2
‐
DV/T
‐
H2
‐
OS
to
discharge
condensate
into
a
drain
outlet.
For
more
information,
refer
to
p.
20.
•
TAKAGI
does
not
recommend
installing
unit
in
an
attic
due
to
safety
issues.
If
you
install
your
T
‐
H2
‐
DV/T
‐
H2
‐
OS
in
an
attic:
•
Make
sure
your
unit
will
have
enough
combustion
air
and
proper
ventilation.
•
Keep
the
area
around
your
T
‐
H2
‐
DV/T
‐
H2
‐
OS
clean.
When
dust
collects
on
the
flame
sensor,
the
water
heater
will
shut
down
on
errors.
•
Locate
unit
for
easy
access
for
service
and
maintenance.
•
A
drain
pan,
or
other
means
of
protection
against
water
damage,
is
required
to
be
installed
under
the
water
heater
in
case
of
leaks.
INSTALLATION
All
gas
water
heaters
require
careful
and
correct
installation
to
ensure
safe
and
efficient
operation.
This
manual
must
be
followed
exactly.
Read
the
“Safety
Guidelines”
section
at
the
beginning
of
this
manual.
WARNING
WARNING
CAUTION
PLEASE
READ
THIS
MANUAL
CAREFULLY
AND
FOLLOW
ALL
DIRECTIONS.