American Water Heater Tankless Water Heater System - Manual (Page 20)

Drawing Number: Drawing Date:
Pres
s
u
re R
e
lief
Valv
e
3/
4"
Ball
Valv
e
3/
4"
U
n
ion
Ch
e
c
k V
a
lve
Ke
y
S
Pres
s
u
re R
egulat
or
C
irc
ulat
ing Pum
p
Solenoid Valv
e
Boiler D
rain Valv
e
WH-1-R
Domestic Hot W
ater - C
irculation Systems
1 Tankless W
ater Heater
Optional Piping Inst
allation
June 11, 2007
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.
G
a
s
S
u
p
pl
y
(O
p
ti
o
n
a
l)
2-
6
G
al
lo
n
St
o
ra
g
e
T
a
n
k
(T
o
elim
ina
te
co
ld
w
a te
r
sandw
ic
h
e
ec
t
caus
e
d
b
y
fr
e
quen
t
On/
O
opera
tion)
Tankless
W
ate
rH
ea
te
r
Expansion T
ank
M
inimum 3/4
“ C
old
W
a
ter Supply Line
M
inimum 3/4
“ Hot
W
a
ter Supply Line
Building Outlets
20
For this application: Pump should be controlled by an
Aquastat,
T
imer or Combination
Aquastat and
T
imer
.
Pump to be sized to maintain circulation loop temperature. A
minimum of 3 GPM flow is recommended
for the circulation system. The pump should be sized to overcome the pressure loss through the Tankless water heater
, optional storage tank, and supply
and return plumbing in the circulation loop. Reference the section
Pump Sizing for
Circulation
.
Pump to be of bronze or stainless construc- tion.
A
quastat C
onnec
tion Tankless Equipment List
QTY
Tankless 1 W
a
ter Heater