DOL 834 CE
Technical User Guide
45
12 Service
12.1 Settings
12.1.1 Climate
12.1.1.1 Setting of exhaustion (MultiStep)
MultiStep is a method for controlling one or more exhaust units in steps, so that the exhaust output becomes
stepless.
The controller controls one or two exhaust units stepless from zero to 100 %, while the rest of the exhaust units
are switched on in steps as required. The controller can regulate up to 8 MultiStep units. The two stepless ex-
haust units can be connected in parallel or sequentially.
Every exhaust unit is equipped with a DA 74C swivel shutter motor, which can open and close the swivel shut-
ter.
The DA 74CV is used for the stepless exhaust unit(s). The internal fan speed controller in the climate controller
or an external fan speed controller controls the fan revolutions. The fan must always be single-phase, or else an
external DOL 31 must be used.
The DA 74CO ON/OFF is used for the other exhaust units. When the shutters open, the fans start via an inte-
grated switch. These fans will then run at their maximum. The fans can be single-phase or three-phase. If three-
phase fans are used, the DA 74CO ON/OFF winch motors must be equipped with contactors, which are con-
trolled by an integrated switch.
The system can also handle an air-operated shutter (wall fan).
Stepless 1 Step 1
Step 2
Up to step 8
Figure 9: MultiStep exhaustion
In order to obtain correct adjustment of the house climate with MultiStep, you must adjust the climate controller
using the ventilation system data:
• Nominal air output of the system in m
3
/h (air requirement of the animals).
• Exhaustion capacity of the stepless exhaustion unit(s)
• Exhaustion capacity of the various steps, MultiStep
Summary of Contents for DOL 834 CE
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