Glow-worm Flexicom cx - Manual (Page 17)

0020107232_03 - 12/14 - Glow-worm
INSTALLATION
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Diagram 5.4
5.11 Filling the Sealed System
The boiler is supplied with a filling device, see diagram 5.1.
This filling device is designed to enable the filling and
pressurisation of the system in the event of loss of pressure.
NOTE: The water pressure at the boiler must be at least
1.2bar to enable filling the boiler to a minimum pressure. If not
pressurisation must be carried out by an alternative filling loop.
Suitable external filling systems are shown diagramatically,
see diagram 5.4. The system should be pressurised to 1bar,
indicated on the digital display with no heating demand.
5.12 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of 8
litres (1.76 gallons), with a charge pressure of 0.5bar.
NOTE: The expansion vessel volume depends on the total
water system volume and the initial system design pressure.
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”.