American Water Heater Tankless Water Heater System - Manual (Page 18)

Drawing Number: Drawing Date:
Pres
s
u
re R
e
lief
Valv
e
3/
4"
Ball
Valv
e
3/
4"
U
n
ion
C
h
ec
k Valv
e
Ke
y
S
Pres
s
ure R
egulat
or
C
irc
ulat
ing Pum
p
Solenoid Valv
e
Boiler D
rain Valv
e
WH-6-D
Domestic Hot W
ater - O
p
ti
o
n
al
F
reeze Protection
6 Outdoor Tankless W
ater Heaters
Preferred Piping Inst
allation
February 27, 2008
This is not an engineering drawing; it is intended only as a guide and not as a replacement for professional engineering project drawings.
This
drawing is not intended to describe a complete system. It is up to the contractor or engineer to determine the necessary components and configuration of the particular system to be installed.
The drawing does
not imply compliance with local building code requirements. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes. Confer with local building of
ficials before installation.
V
acuum
Br
eaker
NO
TE:
outside building struc
tur
e
.
T
hese ar
e indicat
ed
b
y
being abo
v
e
the dashed line
.
line should be located inside the building struc
tur
e
.
T
he vacuum br
eaker line should be locat
ed inside
the building struc
tur
e
.
NO
TE:
a pipe enclosur
e
or r
e
cess bo
x and
packed with insulation f
or additional
pr
ot
ec
tion. C
old
W
a
ter Supply Line
G
as Supply Line
IMPOR
TANT!
W
ith elec
trical po
w
er supplied to a
Tankless
wat
er heat
er
, it will not
fr
eez
e in en
viornments as c
old as
-30ºF
, when pr
otec
ted fr
om dir
ec
t
wind exposur
e
.
In
the ev
ent of a po
w
er failur
e at
temperatur
es belo
w fr
eezing
, the
wat
er heat
er should be drained of
all wat
er t
o
pr
ev
ent fr
eezing
damage
.
T
he unit ma
y be drained manually
or thr
ough the installation of the
Optional solenoid valv
es as sho
wn.
T
he elec
trical c
onnec
tions f
or the
tw
o solenoid valv
es should be tied
to
the 120
V po
w
er t
erminals
pr
o
vided on the PC Boar
d of the
water heater
.
When the elec
trical po
w
er to the
wat
er heat
er fails
, the c
old wat
er
supply solenoid valv
e
closes
,
heater
, and the drain do
wn
solenoid valv
e opens
, allo
wing the
wat
er heat
er and associat
ed piping
to
drain. Ensur
e that y
ou run the
drain f
or the solenoids per local
codes
.
Rout
e
drain
per local codes
Ho
t
W
a
te
r
Su
p
p
ly
S
Su
b
2
Su
b
1
Pr
im
ar
y
Su
b
2
Su
b
1
Pr
im
ar
y
S
P
ressur
e Regulator
Set to 5 PSI Belo
w
Str
eet P
ressur
e
Out
door
Tankless
W
a
ter Heat
er
Out
door
Tankless
W
a
ter Heat
er
Out
door
Tankless
W
a
ter Heat
er
Out
door
Tankless
W
a
ter Heat
er
Out
door
Tankless
W
a
ter Heat
er
Out
door
Tankless
W
a
ter Heat
er
18
Tankless Equipment List
QTY
Tankless Outdoor 6 W
a
ter Heaters
Electronic Connection *
* Refer to Tankless Accessories and Model
Applicability for
electronic connection details.
Normally Closed S
olenoid
V
alv
e
(F
ull Siz
e of C
old
W
a
ter Supply Line)
1/4 “
M
inimum
Normally Open S
olenoid V
alv
e