Potterton Performa 30 HE Installation & Service Instructions Manual page 12

Fig. 4
Fig. 5
Filling Loop
Pressure Relief Valve
12
© Baxi Heating UK Ltd 2009
Double
Stop
Stop
Check
Valve
Valve
Valve
Temporary
DHW
Hose
Mains
Inlet
Fig. 6
Discharge Pipe
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 optional filling loop kit (Part No. 248221) can be
assembled.
3. The filling method adopted must be in accordance with
all relevant water supply regulations and use approved
CH
equipment.
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.
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.
4. A remote relief valve kit is available to enable the boiler
to be installed in cellars or similar locations below outside
ground level (Kit no. 5121379).
System Filling and Pressurising
Expansion Vessel
(Central Heating only)
Pressure Relief Valve (Fig. 6)