System Layouts Examples; System Fill - Bosch Worcester 2000 Series Installation And Maintenance Instructions Manual

Pre-Installation
T[°C]
90
80
70
60
50
A
40
30
0 100 200 300
Fig. 5 Curves for the expansion vessel
1 Pre-charge pressure 0.5 bar (minimum)
2 Pre-charge pressure 0.75 bar
3 Pre-charge pressure 1.0 bar
4 Pre-charge pressure 1.2 bar
5 Pre-charge pressure 1.3 bar
A Operational capacity of the expansion vessel (left of the relevant
curve)
B Additional expansion vessel required (right of the relevant curve)
T Maximum operating temperature [ °C]
V Total System Volume [l]
The default pre-charge pressure for the appliance is 0.75 bar
4.1.3

System layouts examples

Sealed primary system - Single central heating circuit:
Typical primary system example
1
Fig. 6 Single central heating circuit example
[1] Appliance
12
B
5
4
3
2
1
400 500 600 700
V[l]
0010016558-002
Sealed primary system - 2 x central heating zones:
• Requirement for new builds if the floor area of a property is over
2
150m .
2
1
Fig. 7 Separated heating zones
[1] Appliance
[2] Zone valves
4.1.4

System fill

Integral filling link
• An optional filling link accessory is available to fill the system.
– Refer to filling link instructions for fitting and operation.
Filling primary sealed systems
NOTICE:
Filling the primary sealed system
The system must not be filled with salt based softened water.
▶ Ensure the primary water filling point uses an untreated cold water
connection from the mains supply, before a water softener.
• Filling the system must comply with one of the following methods
shown.
• The filling point must be at low level and must never be a permanent
connection to the mains water supply.
• Filling loops must be WRAS approved.
• If the external filling link is sited away from the appliance, then a
pressure gauge should be installed at the filling point.
External filling loop
1
3 3
2
4
Fig. 8 External filling loop system fill example
[1] Cold mains inlet pipe
[2] Stop valve
[3] Check valve
[4] Test point
[5] Hose union
[6] Central heating flow pipe
Worcester 2000 – 6 721 814 551 (2019/09)
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6
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