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.
2.1.2Water circulation system
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 (See figur 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) Overflow
E) Return circulation loop
AOS 1105
Figur 4 - Connection diagram vented systems
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