MANUAL
HK2 – HK4 25-08-2014
Page
30
Boiler pump operation:
The boiler pump will only run if the boiler is in operation. During finished operation the pump will never run.
Except if, the “extended work of CH pump...” parameter (n9) is set > 0; in this case, the pump runs for this time after the
fan has stopped – and if and only if the actual boiler temperature is above “Pump turn on temp.” (n2).
The boiler pump will only run as the boiler temperature is above the start temperature of the boiler pump (n2).
NB: bridging the room thermostat input is necessary. Otherwise the pump will run in an intermediate manor (On for a
time and off in a time).
3-way-valve function:
In correlation with the temperature measurement of the storage tank temperature the 3-way-valve output reacts like
this:
•
As the temperature of the storage tank goes below the temperature of the shift zone valve parameter (n7>0) the
230 VAC output is activated
•
As the temperature afterwards comes above the temperature of the shift zone valve + hysteresis of the shift
valve (n7+n8) the 230 VAC output is de-activated.
Stopping the fan:
Stopping the fan is only possible if the flue gas temperature is below (n6).
Power supply failure:
In the event of a failure in the power supply, the fan (and pump) will continue if and only if the flue gas temperature is
above (n6) as the power comes back.
Alarms:
In the case of an alarm (e.g. defect sensor), the LED lights constant
red
and the relevant alarm code shows in the display
Start and Stop buttons:
Activation by use of the green Start button is only possible in the standard display.
NB: Deactivation of functions by use of the red Stop button is only possible in the standard display.
F button:
Pressing one time shortly on the F button:
The boiler preset temperature is directly adjustable from the front (no code needed), but the adjustable span is only 85-
87 °C.
Boiler preset temperature:
Access: press F button shortly.
Adjust by red and green buttons.
Flue gas temperature:
Pressing the F button once more and the actual flue gas temperature shows in the display.
Press again and the display
return to standard display
.
Parameter list:
Access by pressing the F button for more than 3 seconds.
To gain access to the parameter lists a code is needed.
Parameters under the code: 111
Summary of Contents for HK2
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