American Water Heater Tankless Water Heater System - Manual (Page 17)

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-3-D
Domestic Hot W
ater - O
p
ti
o
n
al
F
reeze Protection
3 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
upp
ly
Li
n
e
S
S
Su
b
2
Su
b
1
Pr
im
ar
y
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:
enclosur
e or r
e
cess bo
x and packed with insulation
for additional pr
ot
ec
tion.
Out
door
Tankless
W
a
ter Heater
Out
door
Tankless
W
a
ter Heater
C
old
W
a
ter Supply Line
G
as Supply Line
Out
door
Tankless
W
a
ter Heater
IMPOR
TANT!
W
ith elec
trical po
w
er supplied t
o
a
Tankles
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
temperatur
es belo
w
fr
eezing
, the
wat
er heater 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 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 heat
er
.
When the elec
trical po
w
er t
o
the
wat
er heater fails
, the c
old water
supply solenoid valv
e closes
,
heat
er
, and the drain do
wn
solenoid valv
e opens
, allo
wing the
wat
er heater and associated piping
to
drain. Ensur
e that y
ou run the
drain f
or the solenoids per local
codes
.
Route drain per local c
odes
17
Tankless Equipment List
QTY
Tankless Outdoor 3 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 Solenoid V
alv
e