VC
Series
Manual
41
Water Heater
Pressure Relief Valve
3/4" Ball Valve
3/4" Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY
Gas
Supply
V1
V3
V2
V4
H1
H2
H3
Circulating Pump
Cold
Water
Line
Hot
Water
Line
n-line
Filter
I
Rinnai
An
LC0~LC9
or
“00”
diagnos
Ɵ
c
code
indicates
the
unit
is
beginning
to
lime
up
and
must
be
fl
ushed.
Failure
to
fl
ush
the
appliance
will
cause
damage
to
the
heat
exchanger.
Damage
caused
by
lime
build
Ͳ
up
is
not
covered
by
the
unit’s
warranty.
Rinnai
strongly
recommends
installa
Ɵ
on
of
isola
Ɵ
on
valves
to
allow
for
fl
ushing
of
the
heat
exchanger.
1.
Disconnect
electrical
power
to
the
water
heater.
2.
Close
the
shuto
ī
valves
on
both
the
hot
water
and
cold
water
lines
(V3
and
V4).
3.
Connect
pump
outlet
hose
(H1)
to
the
cold
water
line
at
service
valve
(V2).
4.
Connect
drain
hose
(H3)
to
service
valve
(V1).
5.
Pour
4
gallons
of
undiluted
virgin,
food
grade,
white
vinegar
into
pail.
6.
Place
the
drain
hose
(H3)
and
the
hose
(H2)
to
the
pump
inlet
into
the
cleaning
solu
Ɵ
on.
7.
Open
both
service
valves
(V1
and
V2)
on
the
hot
water
and
cold
water
lines.
8.
Operate
the
pump
and
allow
the
vinegar
to
circulate
through
the
water
heater
for
at
least
1
hour
at
a
rate
of
4
gallons
per
minute
(15.1
liters
per
minute).
9.
Turn
o
ī
the
pump.
10.
Rinse
the
vinegar
from
the
water
heater
as
follows:
a.
Remove
the
free
end
of
the
drain
hose
(H3)
from
the
pail.
Place
in
sink
or
outside
to
drain.
b.
Close
service
valve,
(V2),
and
open
shuto
ī
valve,
(V4).
Do
not
open
shuto
ī
valve,
(V3).
c.
Allow
water
to
fl
ow
through
the
water
heater
for
5
minutes.
d.
Close
shuto
ī
valve
(V4).
When
unit
has
fi
nished
draining
remove
the
in
Ͳ
line
fi
lter
at
the
cold
water
inlet
and
clean
out
any
residue.
Place
fi
lter
back
into
unit
and
open
valve
(V4).
e.
Close
service
valve,
(V1),
and
open
shuto
ī
valve,
(V3).
Flushing
the
heat
exchanger
11.
Disconnect
all
hoses.
12.
Restore
electrical
power
to
the
water
heater.
Following
fl
ush
procedure
call
technical
assistance
(1
Ͳ
800
Ͳ
621
Ͳ
9419
)
for
PCB
reset
informa
Ɵ
on.
Summary of Contents for RL75e REU-VC2528WD(A)-US
Page 28: ...28 VC Series Manual Ladder Diagram...
Page 83: ...VC Series Manual 83...
