Baxi Potterton LPG Service Manual download pdf (Page 13)

6.0 System Details

Stop

Valve

Double

Check

Valve

Mains

Cold

Inlet

Return

Temporary

Hose

Stop

Valve

Fig. 3

Filling Loop for

Sealed Systems

6.4 System Filling and Pressurising

Sealed Systems

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. The filling method adopted must be in accordance with all

relevant water supply regulations and use approved equipment.

3. Your attention is drawn to the current edition of I.S. 813

“Domestic Gas Installations”.

4. 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.

‘Semi - Sealed’ Systems

1. ‘Semi - Sealed’ systems require the use of a suitable header

tank and ball cock arrangement to charge and provide subsequent

replenishment of the system.

2. The tank must be placed to provide sufficient head in order to

ensure a minimum system pressure of 0.2 bar.

3. A suitable non - return valve must be fitted in the pipework

between the header tank and heating system.

6.5 Expansion Vessel

1. The appliance expansion vessel is pre-charged to 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. Refer to BS 7074 Pt 1. For IE, the current

edition of I.S. 813 “Domestic Gas Installations”.

6.6 Pressure Relief Valve (Fig. 4)

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 1/2”

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. 3a

‘Semi-Sealed’

System

Return

Header Tank

Non-Return

Valve

Fig. 4

Pressure Relief Valve

Discharge Pipe

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Baxi Potterton LPG Service Manual Page 13

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