Main Combi 24 HE Manuel de service télécharger pdf (Page 14)

6.0 System Details

6.5 System Filling and Pressurising

1. A filling point connection on the central heating return

pipework must be provided to facilitate initial filling and

pressurising and also any subsequent water loss

replacement/refilling.

2. There are connection points on the mains cold water inlet

and central heating return isolating taps (Fig. 5) to which the

filling loop kit supplied can be assembled. If the boiler is to be

installed in a location (e.g. loft space) the filling point must be

accessible. The kit supplied can still be used for this, or if

necessary a more suitable propriety kit.

3. The filling method adopted must be in accordance with all

relevant water supply regulations and use approved

equipment.

4. Your attention is drawn to:

for GB: Guidance G24.2 and recommendation R24.2 of the

Water Regulations Guide.

for IE: the current edition of I.S. 813 “Domestic Gas

Installations”.

5. The sealed primary circuits may be filled or replenished by

means of a temporary connection between the circuit and a

supply pipe, provided a ‘Listed’ double check valve or some

other no less effective backflow prevention device is

permanently connected at the inlet to the circuit and the

temporary connection is removed after use.

6.6 Expansion Vessel (Central Heating only)

1. The appliance expansion vessel is pre-charged to 0.5 bar.

Therefore, the minimum cold fill pressure is 0.5 bar. The

vessel is suitable for correct operation for system capacities up

to 125 litres. For greater system capacities an additional

expansion vessel must be fitted. For GB refer to BS 7074 Pt 1.

For IE, the current edition of I.S. 813 “Domestic Gas

Installations”.

6.7 Pressure Relief Valve (Fig. 6)

1. The pressure relief valve is set at 3 bar, therefore all

pipework, fittings, etc. should be suitable for pressures in

excess of 3 bar and temperature in excess of 100°C.

2. The pressure relief discharge pipe should be not less than

15mm dia, run continuously downward, and discharge outside

the building, preferably over a drain. It should be routed in

such a manner that no hazard occurs to occupants or causes

damage to wiring or electrical components. The end of the

pipe should terminate facing down and towards the wall.

3. The discharge must not be above a window, entrance or

other public access. Consideration must be given to the

possibility that boiling water/steam could discharge from the

pipe.

Fig. 4

Fig. 6

Fig. 5

Stop

Valve

Double

Check

Valve

DHW

Mains

Inlet

Return

Temporary

Hose

Pressure Relief Valve

Discharge Pipe

Filling Loop

Stop

Valve

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 55 56

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Main Combi 24 HE Manuel de service Page 14

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