Specifications

S2Gontols
Vdilt
cofiti bcilers
are
ready
for
connecting
oleebcLft:d mains.
W$Gn
conhds
(24OV)
may
be
connected
as
sfwn
h figures 21
to 24.
53
lrolating valves
The
+dianoe
shall
be
installed
with isolatinq
dws
(service
cocks)
as described
unde-r
4-3_3.
5.'tGirculating
pump
The
cirolating
pump
is included
into
the
combi
boiler. The remaining
conveying
capacity
can
betaken from
the
diagram.
SssYstem by-pass
A
system
by-pass is
included
into
the
combi
bdler.
5.6 Open
vented
system
lf it is required
to
use the
combi
heater
in
ooen
systems
it is
possible
to
do so without'anv
modification
to
the
combi
heater.
W6
recommend
to fit
the
expansion
pipe
(2)
at the
isofation
valve
(no.
7,tig.
12)
where
normallv
the
pressure
relief
valve is
fitted.
The
relevani
British
Standards
and
Codes
of Practice
as
well
a:
otl.gr requirements
involved
(see
also
3.1)
should
be
strictly
observed.
Min static head:
0.15
bar
(5'water)
Max
static head:2.0
bar
(67'water)
see BS
5449 clause 24.1
2
expansion
pipe
3 expansion
cistern
7
overflow
pipe
Fig.31
21
800
1000
1200
14c,0
1600
L/h
176
220
264
308 352 cPH