KEY RK-2001W4, Operation Manual, Page: 13 / 20

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6.5. Preventing the boiler from overheating.
The temperature of boiler overheating [A 99] – defines the value of temperature
which, when exceeded, causes the regulator to activate the alarm of the boiler
overheating.
STB – the regulator is equipped with an additional, independent of the processor
security against the overheating. When the temperature exceeds 95° C, the
regulation mode is stopped by the blower being turned off and central heating pump
being turned on. When the temperature is decreased below 89°C, then the blower
and the pump will be turned on to restore the regular work. Applying the STB system
allows the user to control the boiler work thoroughly and minimize the risk of
overheating.
6.6. Testing the fuel demand.
Duration of testing the fuel demand at ignition [Fd2h] – the parameter
determines the maximum period of time that may pass between turning on the
WORK mode and ending the ignition stage. If the ignition cycle is not going to be
finished before the programmed expiration, the fuel demand alarm will be activated.
Duration of testing the fuel demand in the working mode [Fb2h] – testing the
fuel demand in the working mode is activated when the temperature of the exhaust
gases decreases below the [c 90] value (while the exhaust gases sensor is on) or
the temperature of the boiler water decreases below the [L 45] value (when there is
no exhaust gases sensor). If the state is being maintained during the programmed
time, the fuel demand alarm will be activated.
6.7. Multifunctional output.
Additional multifunctional output working mode [Ar 0] – the regulator has been
equipped with an additional multifunctional output compatible with the modes given
below:
parameter [Ar 0] indicates the control of an additional oil or gas boiler. After the
regulator has been turned on with the power switch, the additional boiler is turned off
and when the fuel demand in the solid fuel fired boiler occurs, it is turned on again.
The option is useful in the heating systems where the solid fuel fired boiler is
included in order to decrease the costs of heating. After the fuel demand alarm has
been cancelled with the STOP button, the additional boiler is turned off again and
the work of the regulator is resumed.
parameter [Ar 1] indicates that the additional output will be working as an alarm
output to which a signalling device can be connected. Boiler sensor failure, error of
overheating or fuel demand will cause the indicator to turn on.