Sensors; Differential Pressure - Carrier CCU Controller Bedienungsanleitung

• Progressive for the control of the fan speed controller. This slave control exists regardless of the parameter settings.
• Staged for indicating that the upper temperature limit has been exceeded.
• Gradual limitation of the cooling demand if the lower supply air limit setpoint has been exceeded.
Depending on the strictly proportional composition of the unit, a discrepancy may remain between the setpoint and the
measurement, even with all the elements at 0.
-
Heating control
The master control is increased if the temperature drops below the setpoint. This value is broken down according to the parameter
settings (unit type parameter) and is:
• Progressive for the electrical current or hot water valve control.
• Progressive for the limitation of the dehumidification control. This slave control exists regardless of the parameter settings.
• Staged for indicating that the lower temperature limit has been exceeded. Depending on the composition of the unit, as strictly
proportional, a discrepancy may remain between the setpoint and the measurement, even with all the elements at 0.
- Operation in free cooling mode
• Return air temperature sensor: Progressive operation of motorised dampers then the 3-way valve.
• Supply air temperature sensor: limitation of the 3-way valve then the FRESH AIR damper.
●
Control of the "Target" relative humidity
This is proportional or proportional integral.
- Dehumidification control
The master control is increased if the relative humidity exceeds the setpoint. This value is broken down according to the parameter
settings (unit type parameter) and is:
• Progressive for the chilled water valve control.
• Staged for indicating that the upper relative humidity limit has been exceeded.
Depending on the strictly proportional composition of the unit, a discrepancy may remain between the setpoint and the
measurement, even with all the elements at 0.
This control is limited by the lower drift of the target temperature.
Note: If the cooling and dehumidification controls control the same component, it is the largest value which counts.
- Humidification control
The master control is increased if the relative humidity drops below the setpoint.
This value is broken down according to the parameter settings (unit type parameter) and is:
• Progressive for the humidifier control.
• Staged for indicating that the lower relative humidity limit has been exceeded.
Depending on the composition of the unit, as strictly proportional, a discrepancy may remain between the setpoint and the
measurement, even with all the elements at 0.

10 - SENSORS

● Sensor specifications
• TEMPERATURE
Range: -35°C to + 105°C.
Tolerance: ± 0.2°C from 0 to 70°C.
Thermistor: CTN 10 k at 25°C.
Reference: 10 K 3A1.
Adjustment of the controlled and outdoor temperature sensor from -5 to +5 °C (reserved for the manufacturer access level).
• HUMIDITY
0-10 V sensor range
Relative humidity: 0 to 100%.
Adjustment of the controlled and outdoor humidity sensor from -10 to 10 °C (reserved for the manufacturer access level).

• DIFFERENTIAL PRESSURE

Differential air pressure: 0 to 1000 Pa.
0-5 V sensor range
Differential air pressure: 0.5 V - 4.5 V ⇒ 0 to 1000 Pa
●
Failure to connect, wire cut or short circuit feedback.
Only the temperature sensors are controlled.
The fault is displayed. It stops the corresponding controls and controllers, for example: the outdoor sensor fault can stop the free
cooling control.
Example of adjustment on controlled temperature:
1. Reading parameters (menu 3.3) ⇒ ENTER
2. Cursor opposite parameter P255 - Controlled temperature ⇒ ENTER
3. Modify the adjustment (-5 to +5°C)
4. Confirm with the ENTER key.
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