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2. FOR THE INSTALLER
2.1 Installation instructions
This water heater must be fitted in a
location which will permit the provision
of an approved flue system and
adequate ventilation.
A service clearance of 15 cm at the
sides and rear of the unit and 60 cm at
the front of the unit should be allowed
for ease of servicing. Adequate
distance must be allowed between the
top of the unit and any obstruction or
ceiling to allow the flue baffle and
anode to be inspected, cleaned or in the
case of the anode replaced if
necessary.
The water heater must stand on a
level surface resistant to heat and with
sufficient strength to support the weight
of the unit when full of water.
This water heater must not be
installed in a bath room, bedroom or in a
cupboard opening on to such rooms.
This water heater must not be installed
in any area where flamable materials
are used or stored.
Insufficient ventilation may give rise
to a risk of fire, explosion or
suffocation. If in doubt consult the
national and local regulations governing
the installation of gas appliances or
your local British gas service depart-
ment.
2.1.1 Installation
The installation of this water heater
should be carried out by a suitably
qualified competent person. It is a
criminal offence for unqualified persons
to install gas equipment.
Installation should be carried out in
accordance with all local authority and
building regulations, local water
authority and fire regulations and the
following British standards: 5440, 5546,
6644, 6700, 6798 and 6891.
Some chemicals produce vapours
which can cause rapid failure of
thermocouples, burners and storage
tanks if they are drawn into the
combustion air supply.
Therefore if this water heater will
be used to supply hot water to:
- hairdressers,
- dry cleaners
- industrial degreasing processes
or any other area where
compounds containing halogens are
used and stored, care should be taken
that all primary and secondary air is
drawn from outside atmosphere free of
such contaminents.
For further advise contact A.O.
SMITH.
2.1.2 Water connections
A.O. Smith water heaters are
suitable for connection to vented,
unvented and pumped pressurised
systems. In each case appropriate
valves and fittings should be used to
ensure the system complies with the
requirements of the water by laws, and
appropriate building regulations.
When fitting it is essential the rules
of 'good practice' are applied at all
stages of installation.
Vented systems
If the water heater is to be
connected to a cold feed tank or cistern
the hot water supply pipe must include
an open vent which discharges over
the cold feed cistern. The cold feed
cistern must have an actual capacity of
greater volume than the hourly recovery
rate of the water heater(s) which it
supplies.The minimum actual capacity is
50 gallons or 227 litres.
Unvented
To install an A.O. Smith water
heater on an unvented cold water
supply system a kit of valves and
fittings listed by the water research
centre and complying with part G3 of
12


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