BaltGaz NEVALUX-5514 User Manual page 21

8.2 Operation of the appliance
The appliance's flow chart is represented on scheme 14.
8.2.1
At the beginning of water flow through the water unit 17 with water consumption not less than 2,5...3
8.2.2
l/min the gas valve 24 is opened by the membrane stem 18 and the contacts of the micro switch 21 close. After this
the valve 28 opens gas supply from the cavity behind the membrane of the valve block 26 to the ignition burner 3
and from the electronic control block 11 high-voltage current impulses are supplied to the plug 9.From the electric
sparks between the plug's tip and the ignition burner's nozzle the ignition of the ignition burner occurs. After the
ignition burner's ignition, what can be defined by the flame sensor 8, the valve 27 closes gas supply to the cavity
behind the membrane of the valve block, gas from the cavity behind the membrane comes out through the ignition
burner and the membrane 29 of the valve block opens the valve 30 supplying gas to the main burner 10 with the
help of pressure drop. The main burner ignites and the ignition burner's flame goes out. The main burner's
operation is controlled by the flame sensor 8.
8.2.3 The tap 4 regulates the consumption of gas supplied to the main burner in order to receive the required water
temperature at its set consumption: turning the tap counterclockwise increases gas consumption and water
temperature, turning the tap clockwise reduces gas consumption and water temperature.
8.2.4 The tap 15 changes water consumption in a small range and influences at the same time the displacement of
the membrane 18, and accordingly the value of the valve 24 opening. Turning the tap clockwise reduces water
consumption and increases the membrane's displacement and gas consumption, what leads to water temperature
increase. Turning the tap counterclockwise increases water consumption and reduces the membrane's displacement
and gas consumption, what leads to water temperature reduction. So the tap 15 influences also the water consumption
value, with which the appliance switches on (ignition of the ignition burner, and then of the main burner) and switches
off (switching off of the main burner). When the tap is turned clockwise up to the stop (this position is shown on
Scheme 5), , the water heater is switched on with the consumption of 2,5 l/min, and switched off with the consumption
of 2 l/min. When the tap is turned counterclockwise up to the stop the water heater is switched on with the
consumption of 3 l/min, and switched off with the consumption of 2,5 l/min.
8.4.5.At water flow stop or at its consumption reduction to a volume less than 2...2,5 l/min the contacts of the micro
switch 21 open and the valves 24 and 30 close and the main burner's flame goes out.
8.4.6. The appliance is equipped with safety devices, providing:
- gas access to the burners only in case of water flow;
- gas access to the main burner during the ignition only in case if there is a flame on the ignition burner;
- stop of gas supply to the main burner in case if its flame goes out;
- switching the main burner off in case of no draught in the flue pipe;
- switching the main burner off in case of water flow stop;
- switching the main burner off in case of water heating for more than 90
- switching the main burner off in case of power elements discharge.
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