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The pressure shown on the gauge may differ from that shown on the
digital display. Final system pressure adjustments must be made whilst
referencing the digital display.
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
4.2
Mains supply
4.2.1
Electrical supply
• Supply: 230V AC - 50 Hz
• This appliance must not be connected to a three phase supply.
• The wiring between the appliance and the electrical supply must
comply with the latest IET wiring regulations that apply to wiring a
fixed appliance for Class 1 equipment.
• If the installation requires RCD protection, then an RCD that is
suitable for use with equipment incorporating electronic
components must be used. Suitable RCD's are Type A, B or F.
• The correct type of RCD must be employed where additional
protection is required that is suitable for a low energy DC modulating
pump according to IET wiring regulations.
• External 3 A fuse to BS1362.
• The appliance must be earthed.
• Cable: PVC insulated 0.75mm
90 °C, to BS EN50525.
• Any additional components that are connected to the appliance with
mains electrical supply must not have a separate supply.
• Additional equipment wired to the appliance must comply with the
latest IET wiring regulations.
• Appliance protection rating - IPX2D
4.2.2
Gas supply
• Appliances using Natural Gas (NG) must be connected to a governed
meter.
• Installation and connection of the gas supply to the appliance must
be in accordance with the latest version of BS6891.
• Gas pipe sizing should be calculated to ensure no more than the
permitted mbar drop between the meter to the appliance inlet.
( Figure 67, page 45).
• The meter and pipe work to the meter must be checked, preferably by
the gas supplier. This is to ensure that the equipment is in good
working order and can meet the gas flow and pressure requirements,
in addition to the demand from any other appliance being served.
Greenstar 1000 – 6721835943 (2023/08)
6
5
2
2
(24 x 0.2mm) temperature rated to
Basic pipe sizing calculation
Basic pipe sizing calculation.
▶ This method is only a guide - for more complex design please
refer to latest version of BS6891 and training given in ACS.
Natural Gas (NG):
Discharge rates for copper tube with 1mbar differential pressure
between the ends for Natural Gas.
Discharge rates for Natural Gas (m
with straight horizontal copper tube
Pipe
Length (m)
3
6
9
12
Discharge
3
15
m
/hr
20
25
30
Table 9 Natural Gas
Natural Gas:
▶ When using this table to estimate the gas flow rate in pipe work of a
known length, the effective length will be increased by 0.5m for each
90° elbow and tee fitted and by 0.3m for each 45° bend.
4.2.3
Water supply
Use in hard water areas:
Normally there is no need for water treatment to prevent scale formation
as the maximum temperature of the DHW heat exchanger is limited by
the electronic control.
In areas where temporary water hardness exceeds 200ppm,
consideration may need to be given to the fitting of a scale prevention
device. In such circumstances, the advice of the local water authority
should be sought or proper inhibitor has to be used.
Water mains pressure:
• Minimum mains water pressure, for maximum performance refer to
section 14.1 "Technical data".
• Maximum mains fed water static pressure is 10 bar.
If necessary fit a pressure reducing valve.
NOTICE
Non-return, back flow prevention devices (including those
associated with water meters) fitted to the mains water supply can
cause a pressure build up which could damage the boiler and other
household appliances.
Pre-Installation
3
/hr)
Pipe Size (mm)
15
22
28
2.9
8.7
18
1.9
5.8
12
1.5
4.6
9.4
1.3
3.9
8
1.1
3.4
7
0.95
2.9
5.9
0.92
2.5
5.2
0.88
2.3
4.7
35
32
22
17
15
13
11
9.5
8.5
13
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