E.C.A. GP11, Руководство по обслуживанию

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16. MAIN COMPONENTS
Mainboard
The mainboard operates at 230V AC, 50Hz and controls the gas valve, fan, circulation pump and 3-way
valve. A dynamic air pressure test is performed before each ignition cycle. The limit thermostat
provides an extra level of safety. Whether or not the burner is flame is continuously checked by
ionisation. The signals from the NTCs assess the need for heat and ensure safe operation. The
mainboard provides the operating functions and safety of the device. The mainboard is covered with
a plastic housing and has IP4XD safety class. The mainboard functions are made by the 2
microprocessors (low voltage and high voltage microprocessors) included. The mainboard consists of
2 parts: the high voltage side and the low voltage side. There are microprocessors on both sides. There
is continuous communication between microprocessors. A lot of data is sent from one section to
another for control and comparison.
Gas Valve
The gas valve modulates the flow of gas to the burner. The gas valve has 2 valves. First valve, on / off
safety valve. The second is the main valve (modulating valve) which provides both safety and
modulated gas control. The minimum and maximum operating pressures can be adjusted mechanically
via the gas valve. The modulation valve is set with the maximum output pressure, the maximum
pressure regulator adjustment screw. The minimum outlet pressure is set using the mechanical
minimum adjustment screw (see Gas pressure adjustment).
Burner
The burner is the place where the gas coming from
the gas valve is burned. An 11-bladed burner is
used for 24 kW combi boilers.
Injector diameter in the use of NG: 1,32 mm
Gas inlet connection: G3/4 (External thread)
Ignition – Ionisation Electrode
The device has a single electrode and it is used for ignition and ionisation. The ignition on the burner
leads to burning of the burner by generating a spark with high voltage from the mainboard. Ionisation
electrode generates a current to inform the electronic card whether a flame has formed in the burner
and controls it throughout the burning period.
Attention: To disassemble electrodes, burner should be removed.
Heat Exchanger
The heat exchanger is a component that transfers the energy generated by the burning of
the gas to the installation water. Monothermic heat exchangers only have central heating
water heated, so there is only one water inlet and outlet. In monothermic models, Domestic
hot water is heated by means of a second heat exchanger (plate exchanger).