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1. GEnERAL
1.1
Description of the
appliance
Construction of the water heater is in
accordance with the European standard
for gas heated water storage heaters for
sanitary application (EN89). 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, a Thermal
Reflux Safeguard (TRS) (category
B
). The water heater is suitable for a
11BS
maximum working pressure of 8 bar. The
water heater tank is manufactured from
low carbon sheet steel and is glasslined on
the inside. In addition the tank is fitted with
a magenesium anode as extra protection
against corrosion. A thick, CFC-free, 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 tranfer. The
flue gasses pass their heat on to the water
by means of radiation and convection. The
exhaust of the flue gasses is realized by
natural thermal draught (see figur 1).
Dead legs on a hot water installation are
undesireable. Where possible they should
be avoided. When the inclusion on the
system of a dead leg is unavoidable the
following restrictions should be applied:
- for pipes not eceeding 19 mm. inside
diameter; maximum length of dead leg
permitted 12 metres;
- for pipes exceeding19 mm. but not
exceeding 25 mm. inside diameter;
maximum lenght of dead leg 7,5 metres;
- for pipes with an inside diameter
exceeding 25 mm. maximum length of
dead leg 3 metres.
4
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