User Manual 47
DOL 534 • DOL 539
3.7.6 Ventilation Status
Climate/ Ventilation/ Info
3.7.6.1 Cycle Timer at Minimum Air intake
The objective of the Cycle Time function is to enable the control of air currents in the house at a very limited
ventilation requirement. The function opens and closes the air inlets alternately thus sending a more powerful
air current through the house. This ensures a thorough replacement of housing air. Also see DOL 53X
Technical Manual.
This menu line is visible only when the function Cycle timer min. inlet is used (set in the menu Technical/
Service/ Adjust negative pressure/ Side/ Minimum air inlet).
When DOL 53X regulates minimum ventilation with cycle timer, the flaps
alternately open and close. Next change indicates the time until the flap
position changes the next time.
3.7.6.2 Stepless and MultiStep® Position
The air outlet in the house consists partly of one or more stepless exhaust units, and partly of groups of
ON/OFF exhaust units. The stepless exhaust unit is variable as the controller can adjust the motor performance
and flap opening of the fan while the fans in the other exhaust units are either on or off.
The ventilation system connects the stepless exhaust unit first. When the ventilation requirement exceeds the
capacity of the stepless exhaust unit, a group of the other exhaust units is connected at the same time as the
output of the stepless exhaust unit is reduced. This way, the controller ensures stepless transition from one
ventilation level to the next. If the ventilation requirement increases further, the stepless exhaust unit will
perform up to its maximum until it reduces its output when the next group of ON/OFF exhaust units is
connected.
Each exhaust unit in the house is marked to indicate whether it is a stepless or an ON/OFF exhaust unit. The
latter are numbered according to which MultiStep® they belong. This way, it is possible to recognise the
individual exhaust units and compare their actual output with the status that you can read in the Ventilation
menu. This is relevant particularly in connection with troubleshooting work.
3.7.6.3 Flap Opening
The flap opening is a percentage indication of how much the flaps of both air inlet and air outlet are open. If
you are in doubt about the actual ventilation output, you can compare the display of the ventilation status in the
ventilation menu with the output that you can actually observe in the house. The percentage indications are
relevant particularly in connection with troubleshooting work.
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