4
Diagram 1- Cross-section ADMP-models
1
Draught diverter
2
High-limit and overheat
thermostat sensors
3
Hot-water outlet
4
Thermostat sensor
5
Control box
6
Cold-water inlet
7
Drain cock
8
Thermocouple
9
Pilot burner
10
Gas control block
11
Flue-pipe connection
12
Covering plate for flue-damper
assembly
13
Support for draught diverter
14
T&P connection (temperature
and pressure valve)
15
Anode
16
Flue tubes
17
Flue baffles
18
Insulation
19
Bar burners
20
Radiation shield/condensate
tray
PILOT LIGHT HEATERS (MODELS ADMP)
1.
GENERAL
1.1
Description of heater
Construction methods and equipment of the heaters are
in accordance with the European standards for gasfired
hot water heaters for sanitary use (EN 89). The heaters
are therefore comply with the European Guidelines for
Gas Heaters and are therefore permitted to carry the CE
hallmark. These are open flued heaters without
mechanical ventilator, with a Thermal Reflux Safeguard
(TRS) (heater category B
11BS
). The heaters are suitable
for use with a working pressure of up to 8 bar.
The cylindrical tank is made from sheet steel containing
a number of vertically placed flue tubes. For protection
against corrosion, the inside of the tank is enamelled.
The tank is also fitted with a number if magnesium
anodes for extra protection against corrosion. A thick PU
insulating layer between the tank and the steel jacket
helps to reduce unnecessary heat loss.
When the heater is completely filled with water, it is
under continual mains water pressure. When hot water
is drained from the heater, cold water immediately
enters the heater. For effective heat transfer flue baffles
have been included in the flue tubes. Heat from the flue-
gases is transferred to the water by means of radiation
and convection. The flue-gases are guided to the
chimney via a rotateable and removable draught diverter.
Flue-gases are discharged by thermal draught.
The atmospheric burner consists of a number of bar
burners. One injector is screwed into the manifold for
each bar burner. The function of the injectors in the inlet
venturi ensures a good mixture of gas and primary air.
Secondary air is drawn in between the bar burners. The
permanent piliot light ensures that the burner ignites as
soon as there is a demand for heat.
A radiation shield is fitted beneath the burner which also
serves to collect any condensate (see diagram 1)