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Checking the size of the expansion vessel
To determine whether an additional expansion vessel is required: Follow
the steps below:
▶ Calculate the total system volume (litres).
– Plot a line vertically on the chart ( Fig. 5).
▶ Determine the central heating maximum operating flow temperature.
– Plot a line horizontally on the chart ( Fig. 5).
▶ 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, in the applicable menu function.
– Intelligent filling settings may need to be adjusted to suit on,
appliances with the automatic filling accessory, in the applicable
menu function.
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
Greenstar 2000 – 6 721 820 552 (2021/02)
B
5
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
1
Fig. 7
Separated heating zones
[1]
Appliance
[2]
Zone valves
Pre-Installation
2
13
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