14
Maxima 35 C
2.4 Connection to the gas system
If necessary the local Gas supplier should be consulted, at the installation planning stage, in order to
establish the availability of an adequate supply of gas.
An existing service pipe must
not
be used whitout prior consultation with the local Gas supplier.
A gas meter can only be connected by the Local Gas supplier, or by a Local Gas suppliers
Contractor.
Installation pipes should be fitted in accordance with BS6891.
Appliance inlet working pressure must be 20 mbar MINIMUM, for NG and 37 mbar minimum for pro-
pane.
Do not use pipes of a smaller size than the combination boiler inlet gas isolation valve (22 mm).
The complete installation must be tested for gas soundness and purged as described in BS6891.
All pipework must be adquately supported. An isolating gas valve is provided and should be fitted
on the boiler gas inlet. Please wait 10 minutes when ligthing from cold before checking the gas
rate. Gas pressures should be checked after the boiler has operated for 10 minutes to ensure
thermal equilibrium.
The appliance has no facility to check burner pressures, a combuston test should be carried out instead,
see page 28 (combuston analyser testing).
The connecting kits shown in fig. 6 are supplied as standard.
2.5 Electrical Connections
The unit must be installed in conformity with current national and local regulations.
Connection to the electrical grid
The boiler must be connected to a single-phase, 230 Volt-50 Hz electric line.
The unit’s electrical safety is only guaranteed when correctly connected to an efficient earthing
system executed according to current safety standards. Have the efficiency and suitability of
the earthing system checked by professionally qualified personnel. The manufacturer is not
responsible for any damage caused by failure to earth the system. Also make sure that the
electrical system is adequate for the maximum power absorbed by the unit, as specified on
the boiler dataplate, in particular ensuring that the section of the system’s cables is suitable
for the power absorbed by the unit.
The boiler is prewired and provided with a cable for connection to the electricity line. The connections
to the supply must be made with a permanent connection and equipped with a double pole switch
whose contacts have a minimum opening of at least 3 mm, and fused at max. 3A between the boiler
and the line. It is important to respect the polarities (LIVE: brown wire / NEUTRAL: blue wire / EARTH:
yellow-green wire) in making connections to the electrical supply.
The user must never change the unit’s power cable. If the cable gets damaged, switch off the
unit and have it changed solely by professionally qualified personnel. If changing the electric
power cable, use solely
“HAR H05 VV-F”
3x0.75 mm
2
cable with a maximum outside diameter
of 8 mm.
