Baxi Platinum Combi 24 HE Installation & Servicing Instructions Manual page 14

Fig. 4
Fig. 5
Filling Loop
Pressure Relief Valve
Discharge Pipe
14
Double
Stop
Stop
Check
Valve
Valve
Valve
Temporary
DHW
Hose
Mains
Inlet
Fig. 6
6.0 System Details
6.5
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.
CH
Return
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
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
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.
System Filling and Pressurising
Expansion Vessel (Central Heating only)
Pressure Relief Valve (Fig. 6)