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Pre-Installation
▶ Determine the pre-charge in the expansion vessel based on static
head, 1 metre = 0.1 bar.
– Static head should be measured between the expansion vessel
and the highest point on the system (top of the highest radiator).
▶ Select a curve from the key below (1-5).
▶ System pressure should be set at 0.1 - 0.25 bar higher than the
vessel pre-charge.
– It must be at least to the minimum on appliances with an analogue
gauge.
– Minimum pressure settings may need to be adjusted to suit on,
appliances with a digital gauge.
If the dissected lines are in area A then no additional expansion is
required.
If the dissected line is in are B then an additional expansion vessel must
be installed ( Fig. 4).
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 expansion vessel is 0.75 bar
12
5
B
4
3
2
1
400
500
600 700
V[l]
0010016558-002
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
Sealed primary system - 2 x central heating zones:
• Requirement for new builds if the floor area of a property is over
2
150m
.
2
7
1
Fig. 7
Separated heating zones
[1]
Appliance
[2]
Zone valves
[7]
Auto bypass across flow and return to be at least 1.5m away from
the appliance (3m loop of pipe)
4.1.4
System fill
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.
Greenstar 1000 – 6721835943 (2023/08)
2
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