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5.3. Boiler Operation
Boilers whose functionality has already been verified by the First Heating are started as follows:
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The power cord must be plugged into the socket.
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Set the heating water temperature regulator to about 2/3 of its range – the setting can later be adjusted according to the
temperature of the heating water. The temperature setting f the heating water also affects the speed with which the DHW is
heated up in the external reservoir.
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If the boiler will be used in cooperation with an external DHW reservoir, set the reservoir's regulator to about
1/2
of its
range.
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Check the pressure of the heating water on the boiler's pressure gauge. If the water is cold, the pressure must not be lower
than set by the red hand (set by the authorised service centre during the First Heating).
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The SUMMER/WINTER switch is set depending on the time of the year. LÉTO in summer, ZIMA in winter.
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If the room thermostat regulator is used for regulating the boiler, set the regulator following its instructions for use.
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Put the main switch to the "ON" position ("I"). Flame will be ignited and the DHW reservoir contents are heated up (if there
is a reservoir). If the WINTER/SUMMER switch is set to WINTER, when the DHW is heated up, the heating water is
warmed up and the heating is started, controlled by the heating regulator.
The HCW (heating-circuit water) heating process is stopped when its temperature has achieved the level pre-set on the heating
operation regulator, or if the room temperature has achieved the level pre-set on the room thermostat (i.e. temperature of air in the
room in which the thermostat is installed).
The DHW (domestic hot water) heating up is stopped when the temperature pre-set on the DHW reservoir regulator is achieved,
or the HCW temperature has achieved the level pre-set on the heating operation regulator.
If the boiler does not ignite and the defect indicator is off, the operation is stopped due to one of the operational reasons we have
just described; the heating will automatically start again as soon as the DHW or HCW cools down, or when air temperature
decreases in the room in which the room thermostat is installed.
If the boiler does not start even after a long time and does not respond to increasing of the pre-set temperature value, there is a
defect and a specialised service centre should be called.
If the boiler does not start and the defect indicator is on, follow the instructions in Description of Controls.
5.4. Breaks in Boiler Operation
If the operation of the boiler is to be stopped for a shorter period of time, simply set the main switch to the 'off' position. Before a
longer break between operations, unplug the electrical cord and shut off the gas supply. You can leave water in the boiler if there
is no risk of freezing, otherwise you should discharge water from the boiler and the heating circuit.
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If at all possible, discharge water only from the boiler when disassembling the system – the heating circuit is protected from
corrosion if the HCW is left in.
6. Boiler Maintenance
6.1. Professional Maintenance
The boiler should be checked and adjusted by a professional organisation at least once a year, preferably before the beginning of
the heating season. Such service inspection cost is not included in the guarantee. A list of recommended steps is specified in the
Service Booklet.
Most of the steps are concerned with checking the condition and functions of the burner, adjustment of power output, checking
the tightness of flue-gas duct connections (with repairs if necessary), cleaning of burner nozzles (if necessary – the cleaning must
be done carefully, as the inner diameter of the nozzles must not be changed by the cleaning), and cleaning the heat exchanger in
the boiler.
Checking the functionality of the emergency and flue-gas thermostats is very important – these elements must also be
checked after each servicing on them.
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