Fan speed I = Min. fan speed selectable via P357
Fan speed II = Medium fan speed selectable via P358
When the DC fan characteristic is not linear, fan speed II can be adapted to an
efficient manual speed II.
Fan speed III = Max. fan speed selectable via P359 (heating), P360 (cooling)
Note: Manual fan settings
do not influence control
signals "Heating" and
"Cooling".
When heating with electric heater only, manual fan speed I is unavailable to
guarantee the necessary minimum air flow for the electric heater and to avoid
overheating.
For heating or cooling with 2 sequences (e.g. heating with a heating coil and an
electric heater, or 2-stage cooling), the fan is always synchronized to the 1
st
stage.
For 2-pipe and 2-stage applications, based on the equipment, the fan may have to
run in the 2-stage only (in the 1
st
stage the fan remains Off), either in the heating or
cooling sequence.
The following settings are available by selecting fan control P350 accordingly:
Fan runs in the 2
nd
stage in heating and cooling (example 1
or 2 when combined with the swap function)
P350 = 5: Heating and 2
nd
stage
cooling
Fan runs in heating mode and in the 2
nd
stage cooling
(example 3)
P350 = 6: Cooling and 2
nd
stage
heating
Fan runs in cooling mode and in the 2
nd
stage heating
P350 = 7: 2
nd
stage cooling only
Fan runs in the 2
nd
stage cooling only and not in heating
mode
P350 = 8: 2
nd
stage heating only
Fan runs in the 2
nd
stage heating only and not in cooling
mode
The fan runs only in the 2
nd
stage in the heating and cooling sequence (2-pipe and
2-stage application).
Set both P201 and P203 to 4 or 5 (based on the requested control signal) and set
P350 to 4 (fan in the 2
nd
stage).
Manual operation
DC 0...10 V fan
2 sequences
heating/cooling
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