KEY RK-2001W2N, Operation Manual, Page: 7 / 16

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5.1. Fan work parameters.
Fan power [Π100] - this value defines power of the fan. When „Π” parameter is set to
„0-10” this is the maximum power of the fan which can be achieved during automatic
fan control.
Minimum fan power [n 40] - lowest fan power which can be used when automatic
fan speed control is on and when fan speed is gradually increased during boiler start.
Fan speed decrease coefficient [Πh 2] - this parameter influences the way fan
speed is reduced when boiler tremperature is approaching its desired value. E.g.
setting this parameter to 2 means that when the controller is in WORK mode and
boiler temperature is 2°C lower than desired boiler temperature the fan will work with
its maximum power [Π100]. Further increase of boiler temperature will cause fan
speed to be reduced gradually to its minimum power [n 40].
Automatic fan speed control [Πr 0] - it is on, when this parameter is set to „0-10”
and causes automatic fan speed decrease when temperature of water in the boiler
reaches desired temperature. If this parameter is set to „-”, the fan automatic smooth
speed control is disabled and the fan can work with power set by „Π” parameter. When
this parameter is set to a value between 0 and 10 it defines time (in minutes) of
gradual increase of fan speed from its minimum value [n 40] to value [r 50] for smooth
start.
Fan work time [Πn15] - time of turning the fan on for a while, to remove accumulated
gases. Setting the parameter to „--” turns this function off. This function can be active
in WORK mode.
Fan pause time [Nu 6] - time between fan work periods.
Maximum fan speed during boiler start [r 50] - this parameter sets maximum fan
power used during boiler start. If parameter [Πr 0] is set to „0", then this parameter
sets the fan power used during boiler start.
Boiler start completed hysteresis [rh 5] - this parameter defines, how many degrees
before reaching desired temperature boiler start phase is considered to be finished.
Finishing start mode causes the controller to enter work mode.
5.2. Central heating pump parameters.
Central heating pump launch temperature [P 40] – the value of temperature of the
water in the boiler which causes start of the central heating pump. Central heating
pump works independently from the control process and is launched additionally in
case of boiler overheat.
Central heating pump launch hysteresis [Ph 2] - this parameter defines what value
should temperature decrease by, below central heating pump launch temperature so
that the pump turns off.