System Layouts Examples - Bosch Worcester Greenstar 8000 Series Installation And Maintenance Instructions Manual

Pre-Installation
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). Plotting a line vertically on
the chart ( Fig. 5).
▶ Determine the central heating maximum operating flow temprature
(73 °C for condensing). Plot a line horizontally on the chart ( Fig.
5).
▶ Determine the pre charge in the expansion vessel based on static
head, 1 meter = 0.1 bar. (default = 10 metres).
▶ Select a curve from the key below (1-5).
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 (default setting)
4 Pre-charge pressure 1.2 bar
5 Pre-charge pressure 1.3 bar
T Maximum operating temperature [ °C]
V Total System Volume [l]
4.1.3

System layouts examples

Sealed primary system - Cylinder and central heating zone:
Typical S-Plan example
• The cylinder return must be the last connection on the common
return pipe to prevent reverse circulation.
2
2
3
1
Fig. 6 Cylinder and heating zone
[1] Appliance
[2] Zone valves
[3] Hot water cylinder
12
B
5
4
3
2
1
400 500 600 700
V[l]
0010016558-002
Sealed primary system - Cylinder and 2 x central heating zones:
Typical S-Plan Plus example
• The cylinder return must be the last connection on the common
return pipe to prevent reverse circulation.
2
2
3
1
Fig. 7 Cylinder and 2 x heating zones
[1] Appliance
[2] Zone valves
[3] Hot water cylinder
Sealed primary system - 3-way valve, cylinder and central heating
zone:
Typical Y-Plan example
• The cylinder return must be the last connection on the common
return pipe to prevent reverse circulation.
2
3
1
Fig. 8 3-way valve, cylinder and heating zone
[1] Appliance
[2] 3-Way zone valve
[3] Hot water cylinder
Optional integral diverter valve kit
This appliance is designed to operate on a sealed system only. The
appliance will require to fit a separate flow and return pipe from the
water cylinder to the wall mounting frame and terminate in 15mm
copper pipe.
Details for the connection of the integral diverter valve kit components
are found within the Installation Instructions for the kit.
Sealed primary system - Internal diverter valve kit:
• This appliance is designed to operate on a sealed system only. The
appliance will require a second flow and return pipe from the hot
water cylinder to the wall mounting frame and terminate in 15mm
copper pipe. The following system layouts show a simplified example
of the pipe configuration to the appliance.
Greenstar 8000 Style – 6720883855 (2019/01)
2