Potterton Combi 80, Installation & Service Instructions Manual

Page: 14 / 47

Installation - Page 14
3. Connect the cold water supply to the 15 mm isolating
cock.
4. Connect the hot water outlet pipe using a 15 mm
compression fitting.
Note: The cold water supply isolating cock incorporates
a water strainer. There is an automatic flow limiting
device in the inlet fitting - see Fig. 13.
Showers
If a shower control is to be supplied from the
Combination unit it should be of the type which
incorporates a pressure balancing valve (i.e. MIRA 415
EQUAMATIC).
If the shower control is existing and is of a mechanical
type, it may be necessary to fit a drop tight pressure
reducing valve to the mains supply. Refer to the Shower
Manufacturers instructions.
Note: Showers with a loose flexible hose may require
the fitting of a double check valve, to comply with water
Bye-law 17. This should be fitted down stream of the
appliance.
2.4 C.H. Water Connections
1. Before any central heating connections are made to the
combination boiler, all system valves should be opened
and the system thoroughly flushed out with cold water.
2. Connect the central heating return pipe to the isolating
cock identified by a Blue lever. (right hand of the two
pipes)
3. Connect the central heating flow pipe to the isolating
cock identified by a Red lever. (left hand of the two
pipes)
2.5 Pressure Relief Valve
The pressure relief valve is pre-set at 3 bar.
Install a pressure relief valve discharge pipe, not less
than 15 mm diameter and connect to the pressure relief
outlet.
The position of the discharge pipe should be such that
any discharge of water or steam cannot create a hazard
to persons in or about the premises, or damage to
electrical components or wiring, and the point of
discharge should be clearly visible.
It is recommended that the discharge point be over an
outside drain.