Pressure relief valve
A pressure relief valve set at 3 bar
(43.5 psi) is supplied with the appli-
ance.
Domestic Hot Water System (Combi boiler only)
&
Check that the mains water pres-
sure is sufficient to produce the
required DHW flow rate of 7,5 l/min
(24 kW)/12,8 l/min (30 kW), but
does not exceed the maximum
DHW pressure (10 bar). If neces-
sary, a pressure reducing valve
must be fitted to the mains supply
before the DHW inlet connection.
&
The final 600 mm (24 in) of the
mains supply pipe to the boiler must
be copper.
&
A regulator is fitted to control the
maximum water flow rate.
&
If the appliance is installed in an
area where the temporary hardness
of the water supply is high (over 150
ppm) the fitting of an in line scale
inhibitor may be an advantage. Con-
sult the Local Water Authority if in
doubt.
&
For specific information relating to
fittings (e.g.. showers, washing
machines etc) suitable for connec-
tion in the DHW circuit, consult the
Local Water Authority. However, the
following information is given for
guidance.
Domestic hot/cold water supply taps
and mixing taps: All equipment
designed for use at mains water
pressure is suitable.
Showers and bidets: Any mains
pressure shower or bidet complying
with the Local Water Authority regu-
lations is suitable.
Gas Supply
&
The Gas Supplier should be con-
sulted at the installation planning
stage in order to establish the avail-
ability and supply of an adequate
supply of gas.
&
A gas meter can only be connected
by the gas supplier or by their con-
tractor.
&
An existing meter and / or pipework
should be of sufficient size to carry
the maximum boiler input plus the
demand of any other installed appli-
ance. (BS 6891: 1988). A minimum
of 22 mm dia. pipework is required
to within 1 metre of the appliance
gas cock.
Installation Requirements
(cont.)
27
Preparing for installation
58
62
670
GB
Installation
