Carrier CCU - Page 68

Faults Sources Causes Solutions
Low temperature
Temperature
sensor
Sensor
• Check the sensor
• Replace the sensor
Malfunction
• Check the stability of the control
• Check the operation of the heating valve or the electric heater
Drift in dehumidication
mode
• Internal load insufcient
High temperature
Temperature
sensor
Sensor
• Check the sensor
• Replace the sensor
Malfunction
• Check the stability of the control
• Check the operation of the cooling valve, the compressors
Room overheated • Revise the room loads
Low humidity Humidity sensor
Sensor
• Check the sensor
• Replace the sensor
Malfunction
• Check the stability of the control
• Check the operation of the humidier
• Revise the room loads
High humidity Humidity sensor
Sensor
• Check the sensor
• Replace the sensor
Malfunction
• Check the stability of the control
• Check the operation of the cooling valve, the compressors
Excessively high humidity • Revise the room loads
11 - COMMISSIONING
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