Mains Supply; Electrical Supply; Gas Supply; Water Supply - Worcester Greenstar 8000 Life Series Installation And Maintenance Instructions Manual

Pre-Installation
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.
• Type A RCDs must be employed where additional protection is
required.
• External 3A 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 IP rating - IPX4D
4.2.2

Gas supply

• Appliances using Natural Gas (NG) must be connected to a governed
meter.
• Appliances using Liquid Petroleum Gas (LPG) must be connected to
a regulator.
• Installation and connection of the gas supply to the appliance must
be in accordance with BS6891.
• Gas pipe sizing should be calculated to ensure no more than the
permitted mbar drop between the meter/governor to the appliance
inlet. ( chapter 12.8).
• The meter or regulator and pipe work to the meter or regulator 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.
Pipe sizing (NG & LPG)
Gas pipe work:
▶ Gas installation pipe work must be designed to ensure the pressure
loss between the meter outlet (NG) or storage and regulator (LPG)
and the inlet to each appliance does not exceed 1mbar (NG) 2.5mbar
(LPG)  table 16 "Allowed mbar pressure drop".
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 0.95
25 0.92
30 0.88
Table 5 Natural Gas
12
2
(24 x 0.2mm) temperature rated to
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
2.9 5.9
2.5 5.2 9.5
2.3 4.7 8.5
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 90° bend. This method
is only a estimate - for more complex design please refer to BS6891
2015 and training given in ACS.
Liquid Petroleum Gas (LPG):
Discharge rates for copper tube with 2.5mbar differential pressure
between the ends for LPG.
Discharge rates for LPG (m
with straight horizontal copper tube
Tubing
Length (m)
kW
3 38.4
6 26.1
9 20.5
12 17.9
15 15.5
18 13.5
21 12.9
24 12.0
Table 6 Liquid Petroleum Gas (LPG)
Liquid Petroleum Gas (LPG):
▶ When using this table to estimate the Gas flow rate in pipe work of a
known length, the effective length will be increased by 0.6m for each
90° elbow or tee and by 0.3m for each 90° bend or straight coupler.
This method is only a estimate - for more complex design please refer
to BS6891 2015 and training given in ACS.
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 HW 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
appliance. In such circumstances, the advice of the local water authority
should be sought.
Water mains pressure:
• Minimum mains water pressure, for maximum performance refer to
table 65 - Technical data.
35
• Maximum mains fed water pressure 10 bar.
32
If necessary fit a pressure reducing valve.
22
17
NOTICE:
15
Non return, back flow prevention appliances (including those
13
associated with water meters) fitted to the mains water supply can
11 cause a pressure build up which could damage the appliance and
other household appliances.
3
/hr & kW)
Outside diameter
15mm 22mm
3 3
m /hr kW m /hr
1.49 207 8.01
1.01 135 5.21
0.79 108 4.19
0.70 94 3.62
0.60 82 3.20
0.53 74 2.86
0.50 67 2.58
0.47 61 2.58
Greenstar 8000 Life – 6720883865 (2019/02)
28mm
3
kW m /hr
412 15.92
230 8.86
215 8.33
187 7.25
168 6.51
145 5.61
135 5.24
126 4.87