A.O. Smith EQB 200 G, EQB 115 G, EQB 155 G manual Description, Appliance

1.	GENERAL	exceeding 25 mm. inside diameter;
1.1	Description of the	maximum length of dead leg 7.5
		metres;
	appliance	- for pipes with an inside diameter
		exceeding 25 mm. maximum dead leg
Construction of the water heater is in		3.0 metres.
accordance with the European
standard for gas heated water storage
heaters for sanitary application (EN 89).
The appliance thus meets the European
Directory for Gas Appliances and is
therefore entitled to carry the CE-
marking. It is an open flued appliance
without ventilator and with a flue gas
down	draught safeguard (category

B11BS). The water heater is suitable for a maximum working pressure of 8 bar. The water-heater tank is manufactured from low carbon sheet steel and is glass-lined on the inside. In addition the tank is fitted with a sacrificial anode as an extra protection against corrosion.

Athick PU-insulation layer covered in a steel jacket reduces unnecessary heat loss. When the appliance is filled with water it continuously is under water pressure.

As hot water is drained from the tank, cold water is added immediately. A flue baffle has been placed in the flue tube to improve heat transfer. The flue gasses pass their heat on to the water by means of radiation and convection. The flue gasses are guided to the chimney via the draught diverter. The exhaust of the flue gasses is realized by natural thermal draught (see Figure 1).

Dead legs on a hot water installation are undesireable. Where possible they should be avoided. Where the inclusion on the system of a dead leg is unavoidable the following restrictions should be applied:

-for pipes not exceeding 19 mm. inside diameter; maximum lengh of dead leg permitted 12.0 metres;

-for pipes exceeding 19 mm. but not

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