American Water Heater Tankless Water Heater System - Manual (Page 16)

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-2-D
Domestic Hot W
ater - O
p
ti
o
n
al
F
reeze Protection
2 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.
Ho
t
W
a
te
r
S
uppl
y
Li
n
e
1/
4
" N
o
rm
a
ll
y
O
p
e
n
So
le
n
o
id
V
a
lv
e
Nor
m
al
ly
C
lo
se
d
So
le
n
o
id
V
a
lv
e
(F
ul
l
s
iz
e
o
f
su
p
pl
y
li
n
e)
S
S
Va
cu
u
m
Br
e
a
ke
r
Su
b
1
Pr
im
ar
y
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 cold as -30ºF
, when pr
ot
ec
ted fr
om dir
ec
t wind exposur
e
.
In
the ev
ent of a po
w
er failur
e at temper
atur
es belo
w fr
eezing
, the wat
er
heat
er should be drained of all water 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 connec
tions f
or the t
w
o solenoid valv
es should be tied t
o
the 120
V po
w
er t
erminals pr
o
vided on the PC Boar
d of the water heat
er
.
When the elec
trical po
w
er to the wat
er heater fails
, the cold water supply
drain do
wn solenoid valv
e opens
, allo
wing the water heater and
associat
ed piping t
o
drain. Ensur
e that y
ou run the drain f
or the solenoids
per local c
odes
.
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 locat
ed inside the building
struc
tur
e
.
T
he vacuum br
eaker line should be locat
ed inside
the building struc
tur
e
.
NO
TE:
enclosur
e or r
e
cess bo
x and packed with insulation
for additional pr
otec
tion.
Route drain per local c
odes
Out
door
Tankless
W
a
ter Heater
Outdoor Tankless
W
a
ter Heater
C
old
W
a
ter Supply Line
G
as Supply Line
16
Tankless Equipment List
QTY
Tankless Outdood 2 W
a
ter Heaters
Electronic Connection * * Refer to Tankless Accessories and Model
Applicability for
electronic connection details.