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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)
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