6.4 To allocate the pre-heater
Configuration > I/O allocation settings
Select I/O placement for the connected temperature sensor
and control signals to and from the electric heater in the Con-
figuration > I/O allocation settings submenus.
Do not use the same in- or output for several functions.
Configuration > I/O allocation settings > Analog inputs
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Analog inputs
Device Position
Intake air temperature
Controller AI4
Preheater temperature
PDT2 UI1
Configuration > I/O allocation settings > Digital inputs
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Digital inputs
Device Position
Feedback preheater
Controller DI6
Configuration > ... > Digital inputs> Feedback preheater
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Name
Feedback preheater
Original name Feedback preheater
Contact function
Normally closed
Configuration > I/O allocation settings > Analog outputs
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Analog outputs
Device Position
Preheater Controller AO4
6.5 Operation settings
Data & Settings > Temperature control > Preheater
Adjust the pre-heater temperature set point in the Data & Settings > Temperature control > Preheater menu
When defrosting:
To maintain a supply temperature during by-pass defrosting, the pre-heater need to compensate for the missing heating ca-
pacity. For example, if the correct supply air temperature is 22 °C, but the heating capacity is only 10 °K, the pre-heater set-
point need to be 12 °C.
Unit running:
Example A: To prevent any ice build-up in the exchanger the pre-heater setpoint need to be 0 °C.
Example B: In very cold climates the pre-heater setpoint need to equal the outdoor temperature used for dimensioning the air
handling unit’s heating capacity. For example, if the unit is dimensioned for outdoor temperatures down to -18 °C but outdoor
temperatures in the location is lower, the pre-heater setpoint need to be -18 °C.
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