D.h.w. Supply - Potterton Puma 100 Installation & Service Instructions Manual

Boiler Installation - Page 17
2.3

D.H.W. Supply

a) The domestic hot water circuit does not need a pressure
relief valve, but it is essential to ensure that the pressure
of the cold water supply does not exceed 10 bar (145
lb/in), if in doubt it is advisable to install a pressure
reducing valve. The minimum pressure needed to
operate the domestic hot water system is 1 bar with a
flow of approximately 2.5 litres per minute.
b) Flush out all foreign matter from the supply pipe before
connecting to the appliance.
c) Connect the cold water supply to the 15mm isolating
cock.
Connect the hot water outlet pipe using a 15mm
compression fitting.
Note: Until hot water is available, the flow will be
restricted.
Note: The Cold Water Supply Isolating Cock
incorporates an automatic flow limiting device and water
strainer. If a lower flow is required there is a throttle
valve located below the D.H.W mini expansion vessel.
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.
2.4 C.H. Water Connections
(Fig. 16)
a) 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.
b) Connect the central heating return pipe to the isolating
cock identified by a Blue lever. (right hand of the two
pipes)
c) Connect the central heating flow pipe to the isolating
cock identified by a Red lever. (left hand of the two
pipes)