Baxi Combi Instant 80e Installation & Servicing Instructions Manual page 13

Fig. 4
Fig. 4A
Filling Loop
Pressure Relief Valve
Discharge Pipe
Double
Stop
Stop
Check
Valve
Valve
Valve
Temporary
DHW
Hose
Mains
Inlet
Fig. 5
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. 4a) to which the optional filling loop kit
(Part No. 248221) can be assembled.
3. The filling method adopted must be in
accordance with al relevant water supply
CH
regulations and use approved equipment.
Return
4. Your attention is drawn to: for GB: Guidance
G24.2 and recommendation R24.2 of 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 80
litres. For greater system capacities an additional
expansion vessel must be fitted - refer to BS 7074
Pt 1.
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.
System Filling and Pressurising
Expansion Vessel
(Central Heating only)
Pressure Relief Valve (Fig. 5)
13