American Water Heater Tankless Water Heater System - Manual (Page 33)

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
u
re R
egulat
or
C
irc
ulat
ing Pum
p
Solenoid Valv
e
Boiler D
rain Valv
e
M-1-F
1 Tankless W
ater Heater
Maintenance - Scale Flush Procedure
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
p
ly
V1
V3
V2
V4
H1
H2
H3
Ci
rc
ul
at
in
g
Pu
m
p
C
o
ld
W
a
te
r
L
in
e
H
o
t
W
a
te
r
L
in
e
In
-l
ni
e
F
il
te
r
F
lush P
roc
edur
e
1.
Disc
onnec
t elec
trical po
w
er t
o
the wat
er heater
.
and V4).
3.
C
onnec
t pump outlet hose (H1) to the cold wat
er line at ser
vice valv
e
V2.
4.
C
onnec
t drain hose (H3) t
o
ser
vic
e valv
e
V1.
5.
P
our appr
o
ximately 4 gallons of vir
g
in, f
ood g
rade
, whit
e vinegar or citric
acid int
o pail
.
6.
Plac
e the drain hose (H3) and the hose (H2) to the pump inlet int
o the
cleaning solution.
7.
Open both ser
vic
e valv
es (
V1 and
V2) on the hot wat
er and c
old water
lines
.
8.
Operat
e the pump and allo
w the cleaning solution to cir
culat
e thr
ough
the wat
er heat
er f
or at least 45 minut
es
.
10.
R
inse the cleaning solution fr
om the wat
er heater b
y
:
a.
remo
v
e
the fr
ee end of the drain hose (H3) fr
om the pail
11.
Disc
onnec
t all hoses
.
13.
Rest
or
e elec
trical po
w
er t
o
the water heat
er
.
33