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

Page: 40 / 96

Filling and draining
40 Instruction Manual BFC
4
gis
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
Figure 4.1 Installation diagrams
RE
SE T EN TE
R
T
l
a
c
e
b
d
c
i
h
k g
b
a
d
IMD-0139
e i
f
d
e
m
UNVENTED
j
T
l
a
c
e
b
d
c
i
h
k
g
d
e f d
q
i
c
p
o
IMD-0138
VENTED
j
a
n