A.O. Smith BFC - 28 - Manual (Page 40)

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