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Climate Controller Type 148941 / Type 148942 / Type 148943 / Type 148944
Operation manual
10
5.3.2 Temperature control in 2-pipe mode
The operating mode can be defined according to the following functions in 2-
pipe mode:
•
Changeover sensor
•
Changeover DI
The Climate Controller is in 2-pipe mode if an input is assigned with one of
these functions. The unit is also in 2-pipe mode if the outputs are only
assigned with Heating function or only with Cooling function. Otherwise the
Climate Controller is in 4-pipe operation.
The parameters:
•
Valve hysteresis
•
Nat. convection heating
•
Nat. convection cooling
are used to define the properties of the room temperature control.
The corresponding valve is opened and closed depending on the setpoint,
the operating mode enabled and the valve hysteresis parameter. The fan is
controlled depending on the setpoint and natural convection. The control
voltage for the fan is calculated on the basis of the P-band as well as the
minimum and maximum speed of the fan.
The Climate Controller is factory-configured as a 2-pipe unit
(Heating).
If the Climate Controller is used for a 2-pipe unit (Heating /
Cooling) the digital input with the function Change-Over-DI is used
to switch between heating / cooling.
The inputs and outputs need to be adapted if the unit is a 2-pipe
system (Cooling).
Input 1
→
Polarity:
Break contact (NC)
Input 2
→
Polarity:
Break contact (NC)
Output 1:
Cooling
If ECO mode is enabled in heating mode, the setpoint is lowered by the ECO
setback parameter.
If ECO mode is enabled in cooling mode, the setpoint is raised by the ECO
boost parameter.
