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1105
Figur 4 - Connection diagram vented
systems
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 ta
ken that all primary and secondary
air is drawn from outside
atmosphere free of such
contaminents.
For futher advise contact
A.O. Smith.
2.1.2 Water circulation system
A.O. SMITH water heaters are suitable
for connection to vented, unvented and
pumped pressurised systems. In each
case appropriate valves and ttings
should be used to ensure the system
complies with the requirements of the
water by laws, and appropriate building
regulations.
When tting it is essential the rules of
‘good practice’ are applied at all stages
of installation.
Vented systems (See gur 4)
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.
1) Manual gas valve
2) Stop valve
3) Three way valve
4) Safety valve
5) Non return valve
6) Circulation pump
7) Drain valve
A) Gas supply
B) Hot water outlet
C) Cold water inlet
D) Overow
E) Return circulation loop
AOS 1105
14


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