TYPICAL
SEALED
SYSTEM
A-
B-
C-
p-
R-
Appliance expansion vessel
- central heating
Extra expansion
vessel
- central heating return
Drain
cock
Pressure relief discharge
Radiators
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720
611
927-02.10
~ORCESTER
INSTALLATION
&
SERVICING
INSTRUCTIONS
FOR
WORCESTER
BOSCH
GREENSTAR
25CDV30CDV37CDci42CD•
6
720
613
700a
(2006/11)
Bosch
Group
WATER SYSTEMS &
PIPEWORK
PLASTIC
PIPEWORK:
• Any plastic
pipework
must have a polymeric
barrier with
600
mm
(minimum) length
of
copper
or steel pipe
connected
to
the boiler.
Plastic
pipework
used for underfloor heating
must be correctly controlled with a thermo-
static blending valve limiting the temperature
of
the circuits to approx.
50°C.
The
pipework
from the boiler
to
the blending
valve
must be
in
copper
or steel (protected
from corrosion).
CONNECTIONS/VALVES:
• All system connections, taps and mixing
valves must be capable
of
sustaining a pres-
sure up
to
3 bar.
Radiator
valves should conform
to
BS2767:10.
• All other valves should conform
to
BS
1010.
On
new
installations, or extensions to exist-
ing systems where a radiator previously did
not exist, each radiator
should be fitted with
a
TRV, except the one fitted
in
the same
room/area as the room thermostat.
On boiler only replacement jobs, it is recom-
mended, (but not mandatory,)
to
fit a TRV on
each radiator.
It is, however, a requirement,
for energy conservation purposes,
to
recom-
mend
to
the customer that a TRV is fitted
to
each radiator.
• An automatic bypass may be required,
(downstream
of
the pump),
in
order to main-
tain the minimum flow-rate through the appli-
ance.
• A drain
cock
is required at the lowest point
on the system.
• An air vent is required at the highest point
on the system.
SHOWERS/BIDETS
If a shower head can be immersed
in
water
or
comes
closer than
25
mm from the
top
edge
of
a bath
or
shower tray spill over level
then
an
anti-siphon device must be fitted
to
the shower hose.
Bidets with
direct
hot & cold mains water
can be used (with the
approval
of
the local
water authority) and must be the over rim
flushing type with shrouded outlets to pre-
vent the fitting
of
hand held sprays.
SEALED
PRIMARY SYSTEM:
The
CH
sealed system must be filled using
the built-in filling link (see page 23).
Where
the system volume is more than
100
litres or exceeds 2.65 bar at maximum
heating temperature
an
extra expansion ves-
sel
(B) must be fitted as close as possible
to
the appliance
in
the central heating
return.
Pressurize the extra expansion vessel (B) to
the same figure as the expansion
vessel
built
into the appliance.
Do
not
use
galvanised
pipes
or
radiators.
WATER
SYSTEMS
& PIPEWORK
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