MAINS WATER EXPANSION VESSEL:
A-
Mini expansion vessel, part
No.7
716
102 105
B - Mains water
inlet pipe
C-
Non-return valve
D-
Boiler
D
--------•
B
c
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MAINS SUPPLIES
ELECTRIC SUPPLY:
Supply:
230V-
50Hz
(See Technical Data for IP ratings.)
Cable: PVC insulated
0.
75mm2
(24 x 0.2mm) temperature rated to
90°C.
External
3A
fuse to BS1362.
The
appliance must
be
earthed.
• All pipes to the boiler must be cross-bonded.
Wiring must comply with lEE wiring regula-
tions and
any
local regulations which
may
apply to fixed wiring to a stationary appliance.
GAS SUPPLY:
Boilers using
NG
must
be
connected to a
governed meter.
LPG boilers must be connected to a
regulator.
Installation
and connection of the gas sup-
ply
to the boiler must be
in
accordance with
BS6891.
Under no circumstances should the size
of
the gas supply pipe be less than that of the
appliance inlet connection.
The
meter or regulator and pipework to the
meter must be checked,
preferably
by
the
gas
supplier, to ensure it
is
in
good working
order and can meet the gas
flow and pres-
sure requirements
in
addition to the demand
from any other
appliance being served. This
does not
include the pipework from the
meter to the
boiler.
For
olive
connections we recommend using
gas pipes with
minimum
0.9
mm
wall thickness.
WATER
SUPPLY:
Water Mains Pressure:
Minimum mains water pressure
1.5
up to
2.5 bar (see
technical data
on
page
6)
for
maximum performance.
Maximum mains fed water pressure
10
bar.
If necessary, fit a pressure reducing valve.
IMPORTANT:
Non-return,
back
flow
pre-
vention
devices
(including
those
associat-
ed
with
water
meters)
fitted
to
the
mains
water
supply
can
cause
a
pressure
build
up
which
could
damage
the
boiler
and
other
household
appliances.
Where the mains water supply has a non-
return, back flow prevention valve fitted, a
mini expansion
vessel
(A)
should be con-
nected to the mains water inlet pipe (B)
between the non-return
valve (C) and the
boiler (D) as shown opposite.
Use in hard
water
areas:
Normally there is no need for water
treatment
to
prevent
scale
formation
as
the
maximum
temperature
of
the
DHW
heat
exchanger
is
limited by
the
electronic control circuit.
In areas where
the
temporary water hardness
exceeds
200 ppm, consideration may need
to
be
given
to
the
fitting
of
a
scale
prevention
device. In such circumstances,
the
advice
of
the
local water authority should
be
sought.
MAINS SUPPLIES
INSTALLATION & SERVICING INSTRUCTIONS
FOR
WORCESTER BOSCH GREENSTAR
25CDI/30CDI/37CDI/42
co;
~ORCESTER
6 720
613
700a
(2006/11)
Bosch
Group
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