Carrier CCU Control Manual page 68

11 - COMMISSIONING
Faults
Low temperature
High temperature
Low humidity Humidity sensor
High humidity Humidity sensor
68
Sources Causes
Sensor
Temperature
Malfunction
sensor
Drift in dehumidification
mode
Sensor
Temperature
Malfunction
sensor
Room overheated
Sensor
Malfunction
Sensor
Malfunction
Excessively high humidity
Solutions
• Check the sensor
• Replace the sensor
• Check the stability of the control
• Check the operation of the heating valve or the electric heater
• Internal load insufficient
• Check the sensor
• Replace the sensor
• Check the stability of the control
• C heck the operation of the cooling valve, the compressors
• Revise the room loads
• Check the sensor
• Replace the sensor
• Check the stability of the control
• C heck the operation of the humidifier
• Revise the room loads
• Check the sensor
• Replace the sensor
• Check the stability of the control
• C heck the operation of the cooling valve, the compressors
• Revise the room loads