Redring L318, LP330 manual Ventilation, Electrical Supply, Central Heating Systems, Pressure Gauge

If the boiler is to be placed in a cupboard this cupboard should not be used as a storage cupboard. Ventilation should be provided as detailed below.

Ventilation

This boiler does not require a purpose provided air ventilation in the room, however it does require room air to circulate through the boiler to ensure the convection heat output performance is maintained.

If the boiler is installed in an enclosure or small cupboard, there must be an equivalent ventilation free area in the enclosure or small cupboard to that of the boiler.

Upper Ventilation Free Area	These should be the same or larger than in the
	appliance case mm2
Lower Ventilation Free Area	As above

Electrical Supply

This appliance must be earthed

The appliance is supplied with a 2 m electrical flex with integral fused plug, which requires a standard 220 - 240V ~ 50Hz supply via a normal ring main socket. If required, the plug connection can be made via the 24 hour plug in timer supplied.

All fuses must be ASTA approved to BS 1362

In the event of an electrical fault after installation of the boiler, preliminary electrical system checks must be carried out. i.e. earth continuity, short circuit, polarity and resistance to earth.

Central Heating Systems

This boiler is designed specifically for use in small, pressurised, sealed system installations. The installation must comply with BS 6798.

Safety Valve – The safety valve, which is pre-set at a maximum of 3 bar is an integral part of the boiler and cannot be adjusted. Its relief outlet must be piped to a suitable outside position.

Pressure Gauge

This indicates the system fill pressure. It will show a higher pressure when the system is hot.

Circulating Pump

The circulating pump is located inside the boiler case. Its performance is suitable for all systems to which the boiler should be connected.

Expansion Vessel

The expansion vessel, which is located inside the boiler case, has a capacity of 2.0 L, with a pre -charge of 0.5 bar.

The maximum heating system water content using this integral expansion vessel is 24.0 L. This is with a cold fill of 0.5 bar.

Should the system volume be in excess of that specified, a second expansion vessel must be connected to the heating system. BS 5449 gives further guidance for expansion vessel sizing.

Vessel Charge and Initial System Fill Pressure	Bar	0.5	1.0	1.5
For Expansion Vessel Capacity
(Multiply the system Volume by)		0.0833	0.109	0.156
Total system water capacity using the integral
2.0 L expansion vessel	Litres	25.0	18.4	12.8

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