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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
R
E
S
E
T
E
N
T
E
R
T
l
a
c
e
b
d
c
i
h
kg
b
a
d
IMD-0139
ei
f
d
e
m
UNVENTED
j
T
l
a
c
e
b
d
c
i
h
k
g
d
efd
q
i
c
p
o
IMD-0138
VENTED
j
a
n