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10 - MANAGEMENT OF THE ANALOGUE INPUTS
■ Heat exchanger ambient sensor : CTN 10 K at 25°C (if P2 = 2)
This sensor monitors the temperature inside the hydraulic enclosure housing the heat exchanger(s) in order to:
- Turn on the heaters
- Display the temperature inside the enclosure (display range: 40 to 99.9°C, resolution: 0.1 K)
- Automatic acknowledgement
E X C H A N G E R
S E N S O R
- Sensor wire cut and short circuit: heaters turned on (relay in On position), message on LCD, unit fault LED flashes, fault saved
in fault memory + general fault relay in On position.
■ Control stage discharge sensor (1, 2, 3 or 4) : CTN 50 K at 25°C (all configurations)
- Monitors the discharge temperature on the compressors
- Displays the discharge temperature (display range: 5 to 150°C, resolution 1 K).
D . T E M P .
- If the sensor wire is cut (check 5 minutes after compressor turned on) and the sensor short-circuits (continuous monitoring), the
corresponding control stage is turned off and the auxiliary heaters are turned on if need be. If there are no auxiliary heaters, the
boiler relay moves to the On position if P111 = boiler. A message appears on the LCD, the circuit fault LED is lit steady, and the
fault is saved in the fault memory.
- This fault must be acknowledged manually if the temperature < 145°C. The discharge fault must also be acknowledged.
■ Water manifold outlet sensor : CTN 10 K at 25°C (if P2 = 1, 2 or 3 and P6 = 2)
This sensor monitors the water temperature on the exchanger outlet in order to :
- Adjust the unit (to water return)
- Display the common water outlet temperature (display range: 40 to 99.9°C, resolution: 0.1 K).
- Automatic acknowledgement
M A N I F .
S E N S O R
- Sensor wire cut and short circuit :
• If water return control or if P2 = water-to-water and heating mode on (i.e. sensor not used for control):
Normal control, message from table 2 in machine status menu shown on LCD, unit fault LED flashes, fault saved in fault memory,
general fault relay.
• If water outlet control and (cooling mode on or P2 = 3):
Unit shut off, message from table 1 in machine status menu shown on LCD, unit fault LED lit steady, fault saved in fault memory,
general fault relay
■ Circuit suction sensor : CTN 10 K at 25°C (all configurations)
If P42 = 2 (electronic expansion valve on VCM board)
The sensor is connected to the expansion valve board and the temperature information is transmitted over the bus link.
The sensor monitors the suction temperature in order to:
- Display the superheat temperature (display range: 40 to 99.9°C, resolution: 0.1 K)
- Automatic acknowledgement
- If the sensor wire is cut or the sensor short-circuits:
• If P43 = No: a secondary fault is displayed, the fault LED flashes; the circuit fault relay is in the On position and the fault is
automatically acknowledged
• If P43 = Yes: The corresponding circuit is turned off and the auxiliary heaters are turned on if need be. If there are no auxiliary
heaters, the boiler relay moves to the On position.
If P111 = Boiler. A message appears on the LCD, the circuit fault LED is lit steady, and the fault is saved in the fault memory
and automatically acknowledged
► Fault message :
S U C T I O N
F A U L T
■ Circuit liquid sensor : CTN 10 K at 25°C (all configurations)
This sensor measures the liquid temperature in order to:
- Display the subcooling temperature (display range: 40 to 99.9°C, resolution: 0.1 K)
- Automatic acknowledgement
- If the sensor wire is cut or the sensor short-circuits, a secondary fault is displayed, the fault LED flashes, the circuit fault relay is
in the On position, and the fault is automatically acknowledged
► Fault message :
L I Q U I D
F A U L T
■ Fault detection values :
- For the 50 K sensors: Cut-off fault (or sensor absent) if < 5°C and the unit has been operating for 5 minutes, and sensor short-
circuit if > 148 °C.
- For the 10 K sensors: Cut-off fault (or sensor absent) if < 40°C and sensor short-circuit if > 99°C.
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