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TYPICAL SEALED SYSTEM
A - Appliance expansion vessel
- central heating
B - Extra expansion vessel
- central heating return
^WORCESTER
INSTALLATION & SERVICIN
6 720 611 927b (04/05)
Bosch
roup
6720 611 927-02.10
INSTRUCTIONS FOR WORCESTER BOSCH
REENSTAR 25CDi/30CDi/35CDi/40CDi
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).
CO N N ECTI O N S/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 BS1010.
•
Thermostatic radiator valves (TRVs) must be
used on all radiators within the sleeping
accommodation but not the radiator where
the room thermostat is sited. This must be
fitted with wheelhead and lockshield valves
and left open.
• 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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