4
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.
This is a closed device without
exhaust (type C11/31). The storage
device is suitable to be used with an
operating pressure of up to 8 bar. The
tank is made of steel plate, which is
glass lined on the inside. The tank is
also provided with an anode to give
extra protection against corrosion. A
thick PU insulation layer, covered with
a steel casing, prevents unnecessary
heat loss.
If the storage device is completely filled
with water, it will continuously be
under water-feed pressure. When hot
water is drawn off from the device, it
is immediately topped up with cold.
To ensure an improved heat transfer, a
vortex strip has been built into the fire
tube. The flue gases are carried out via
the draught hood and the vertical roof
duct or the horizontal exterior-wall
duct. The exhaust of the flue gases
and the supply of combustion air is
realised by means of a natural, thermal
draught (see Fig. 1).
To create extra comfort in case of long
pipelines, circulating piping with a
circulating pump may be connected to
the piping. The circulating pipeline can
be connected to the cold-water supply.
1.2
Technical safety
equipment
1.2.1 Gas control valve
The water heater has been fitted with a
gas control block consisting of a
thermo-electrical pilot flame safeguard,
pilot flame pressure regulator, burner
pressure regulator, a control thermostat
(adjustable between 30°C and 70°C)
and a safety thermostat (82°C). This
gas control block with its simple and se-
cure control respectively switches the
gas supply to the main burner on or off.
