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4.1.4
System fill
Filling primary sealed systems
NOTICE:
Filling the primary sealed system
The system must not be filled with salt based softened water.
▶ Ensure the primary water filling point uses an untreated cold water
connection from the mains supply, before a water softener.
• Filling the system must comply with one of the following methods
shown.
• The filling point must be at low level and must never be a permanent
connection to the mains water supply.
• Filling loops must be WRAS approved.
• If the external filling link is sited away from the appliance, then a
pressure gauge should be installed at the filling point.
External filling loop
1
3
3
2
4
Fig. 11 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
Top-up tank system fill
In situations where the cold mains pressure is not sufficient to pressurise
the system to between 1 and 1.5bar an alternative can be to use a top-up
tank.
9
Fig. 12 Top-up tank system fill example
[2]
Stop valve
[3]
Check valve
[6]
Central heating flow pipe
[7]
Top-up tank
[8]
Automatic air vent
[9]
Minimum height above the highest point of the system - 1000mm
(39 in)
Greenstar 8000 Life – 6720883858 (2019/02)
6
5
2
7
8
2
3
6
0010012943-001
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 3fuse 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
Pre-Installation
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
35
32
22
17
15
13
11
13
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