Glow-worm Ultracom 24cxi Installation And Servicing page 14

7.2.2 Heating circuit design
5
4
3
2
1
Key
1 Drain point
2 External bypass (if required)
5 Boiler
6 Filling loop - to be unlocked and disconnected after use.
7 Double check valve assembly
8 Additional expansion vessel (if required)
9 Heating return circuit
General
This boiler is designed for use as part of a sealed water central
heating system with fully pumped circulation. The pump,
within the boiler.
Safety valve
The safety valve is an integral part of the boiler and it cannot
discharge safely in accordance with standards.
Expansion vessel
The boiler has an integral expansion vessel with a capacity of 8
litres (1.76 gallons), with a charge pressure of 0.75bar.
i The heating system volume should be calculated to
be necessary to add an additional vessel.
- In GB, Guidance on vessel sizing is also given in the current
issue of BS5449 and BS7074 Part 1.
- In IE, current edition of I.S.813 "Domestic Gas Installations".
0020085231_02 - 05/10 - Glow-worm
6
i
7
8
see diagram below.
9
10
3
11
2
1
3
2
1
Key
2 Heating return circuit
3 Boiler
4 Double check valve assembly
7 Drain point
9 Tundish
The system should be pressurised to 0.8bar, indicated on the
digital display with no heating demand.
INSTALLATION
Bypass
Filling the sealed system
7
4
5
6
5
8
9
7
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