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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.
• 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 - IPX4D
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. (
chapter 6).
• 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.
Pipe sizing (NG)
Gas pipe work:
▶ Gas installation pipe work must be designed to ensure the pressure
loss between the meter outlet (NG) table 20 "Allowed mbar
pressure drop".
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.
Worcester 2000 – 6 721 814 551 (2019/09)
2
(24 x 0.2mm) temperature rated to
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 8 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 90° 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 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.
Keyless filling link accessory
Minimum static pressure.
▶ A minimum static pressure of 1.75bar is recommended for correct
operation of the Keyless filling link.
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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