A.O. Smith 28 30 50 60 Installation & Service Manual page 40

4
Legend
a pressure-reducing valve
(mandatory)
b expansion vessel (mandatory)
c T&P valve (mandatory)
d stop valve (recommended)
e non-return valve (mandatory)
f circulation pump (optional)
g drain valve
h gas valve (mandatory)
i stop valve (mandatory)
j temperature gauge (optional)
k condensation drainage
(mandatory)
l hot water draw-off points
m pressure relief valve
(mandatory)
n water cistern
o float valve
p 3-way venting valve
(recommended)
q overflow pipe
a cold water supply
b hot water outlet
c circulation pipe
d gas supply
e flue gas discharge and air
supply
40
Filling and draining
UNVENTED
b
i
j
T
d
h
VENTED
b
i
T
j
e
d
h
Figure 4.1 Installation diagrams
l
e
d
c
f
e
d
c
b
m e a
k g
o
p
q
l
n
c
i
c
a
d e f d
k g
Instruction Manual BFC
gis
a
i
IMD-0139
a
c
IMD-0138