20 | Pre-Installation
6 720 644 143 (2010/09)
5 Pre-Installation
5.1 Water system and pipe work
Plastic pipe work:
• Any plastic pipe work must have a polymeric barrier
with 600 mm (minimum) length of copper pipe
connected to the boiler.
• Plastic pipe work used for underfloor heating must be
correctly controlled with a thermostatic blending
valve limiting the temperature of the circuits to
approximately 50 °C.
Primary systems connections/valves:
• All system connections, taps and mixing valves must
be capable of sustaining a pressure up to 3 bar
(300 kPa).
• Bosch recommends that thermostatic radiator valves
(TRV’s) be used on all radiators within the sleeping
accommodation but not the radiator where the room
thermostat is sited. This must be fitted with lock-
shield valves and left open.
• A drain point is required at the lowest part of the
system.
• An air vent is required at all the high points in the
system.
Sealed primary system:
• The CH sealed system must be filled using an
approved filling loop or comply with figure 6 for
system fill.
• Do not use galvanised pipes or radiators.
System fill
Fig. 6
A System fill
AA Auto air vent
B System make up
CV Check valve
D 1000 mm (39 in.) above the highest point of the system
SV Stop valve
1 Heating return
2 Hose union
3 Temporary hose
4 Test point
5 Mains supply
6 Make-up vessel
7 Fill point
Fig. 7 Additional expansion vessel
1 Boiler expanison vessel - CH
2 Extra expanison vessel - CH return
3 Pressure relief discharge-
The boiler is equipped with an automatic
internal by-pass.
NOTE: Artificially softened water must not
be used to fill the CH system.
SV SV
CV
CV
SV
CV
A
6720644143-41.1J
D
1
3
4
6
7
2
B
1
5
1
2
3
6720644743-09.1Wo
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