10
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.
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 bathroom,
bedroom or in a cupboard opening on to such rooms.
This water heater must not be installed in any area
where flammable 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 department.
2.1.1 Installation
These water heaters must be installed by a qualified
competent installer, in accordance with the following
standards and regulations.
Gas safety (installation and use) regulations 1944.
BS 5440
part 1 1990
part 2 1989
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: British Gas Publication UP1 and UP2.
BS 5482
part 1 1979
part 2 1979
part 3 1979
BS 6644
BS 6700
BS 6798
Some chemicals produce vapours which can cause
rapid failure of thermocouples, burners and storage
tanks if they ware 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
of 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. See diagram 4.
Diagram 4 – Typical UK vented system
1
Gas cock
2
Stop valve
3
Three way vent valve
4
T&P vlave
5
Non-return valve
6
Circulation pump
7
Drain valve
A Gas Supply
B Hot Water
C Cold Water
D Overflow
E Return Circulation