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Normal
Operation
31
│
Page
Turn
off
the
electrical
power
supply
and
close
the
manual
gas
shutoff
valve
and
the
manual
water
control
valve
before
servicing.
MAINTENANCE
AND
SERVICE
Be
sure
that
all
openings
for
combustion
and
ventilation
air
are
not
blocked.
The
venting
system
should
be
checked
annually
for
any
leaks,
corrosion,
blockages
or
damage.
The
burner
should
be
checked
annually
for
dust,
lint,
grease
or
dirt.
Keep
the
area
around
the
water
heater
clear.
Remove
any
combustible
materials,
gasoline
or
any
flammable
vapors
and
liquids.
In
accordance
with
all
local
codes
and
common
safety
practices,
Water
discharged
from
the
pressure
relief
vale
can
cause
severe
burns
instantly
from
scalding.
DO
NOT
touch
the
pressure
relief
valve.
If
the
relief
valve
discharges
periodically,
it
may
be
due
to
thermal
expansion
in
a
closed
water
supply
system.
Contact
the
water
supplier
or
local
plumbing
inspector
on
how
to
correct
this
situation.
Visual
check
of
burner
flames
(see
below)
through
the
burner
window
in
the
burner
assembly
located
at
the
middle
of
the
water
heater.
Hydro
‐
Smart
recommends
having
the
unit
checked
once
a
year
or
as
necessary
by
a
licensed
technician.
If
repairs
are
needed,
any
repairs
should
be
done
by
a
licensed
technician.
UNIT
DRAINING
1.
Close
the
manual
gas
shut
off
valve.
2.
Turn
off
power
to
the
unit
and
wait
a
couple
of
seconds.
Turn
on
again.
3.
Wait
30
seconds,
and
then
turn
off
power
to
the
unit,
yet
again.
4.
Close
the
water
shut
off
valve.
5.
Open
all
hot
water
taps
in
the
house.
When
the
residual
water
flow
has
ceased,
close
all
hot
water
taps.
6.
Have
a
bucket
or
pan
to
catch
the
water
from
the
unit’s
drain
plugs.
Unscrew
the
two
drain
plugs
(Large
and
small)
to
drain
all
the
water
out
of
the
unit.
7.
Wait
a
few
minutes
to
ensure
all
water
has
completely
drained
from
unit.
8.
Securely
screw
the
drain
plugs
back
into
place.
Hand
‐
tighten
only.
WARNING
Drain
Plug
(Large)
Water
Valve
Drain
Plug
(Small)
Gas
Valve
Unsatisfactory
Satisfactory
Unsatisfactory
Blue
flame
Red
or
Yellow
flame
Flame
blowing
up