6.0
SYSTEM DETAILS
12
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 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 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 primary circuit and a supply pipe provided
the arrangement in accordance with Diagram R24.2a of
the Water Regulations Guide.
6. The temporary hose must be completely removed at
both ends 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. 9)
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 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. 8
Fig. 9
Stop
Valve
Double
Check
Valve
DHW
Mains
Inlet
CH
Return
Temporary
Hose
Pressure Relief Valve
Discharge Pipe
Stop
Valve
Summary of Contents for Combi 24 HE
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