Baxi Maxflow Combi WM Installation And Servicing Instructions page 19

Pressure Relief Valve
Adaptor
Discharge Pipe
Fig. 23
Fig. 24
8.0 Installation
8.3 Fitting the Pressure Relief
Discharge Pipe (Fig. 24)
1. Remove the discharge pipe from the kit.
2. Determine the routing of the discharge pipe in
the vicinity of the boiler. Make up as much of the
pipework as is practical, including the discharge
pipe supplied.
3. The pipework must be at least 15mm diameter
and run continuously downwards to a discharge
point outside the building. See section 6.7 for
further details.
4. Utilising one of the sealing washers, connect
the discharge pipe to the adaptor and tighten the
nut.
5. Complete the discharge pipework and route it
to the outside discharge point.
8.4 Unvented Hot Water Storage
NOTE: The installation is subject to Building
Regulations approval and the Local Authority
must be informed of the intent to install.
Consideration must be given to Building
Regulations document G3.
1. The components supplied in the box marked
"Unvented Kit" MUST be fitted to the mains water
supply.
2. No isolating valves must be fitted between
these components and the boiler.
3. The combined filter and pressure reducing
valve must ideally be fitted before the mains
water supply divides to feed the boiler and the
rest of the dwelling.
4. The discharge pipes from the expansion relief
valve supplied in the kit and the
temperature/pressure relief valve on the boiler
storage cylinder must be routed to the tundish
supplied.
5. These discharge pipes must be 15mm, and the
pipe downstream of the tundish at least 22mm.
6. See Section 8.5 and the instructions supplied
in the unvented kit for full details.
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