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Operation and maintenance instructions – v2.8.8 & 2.7.3
- Conditions:
• Unit with counter flow heat exchanger
- Causes:
• The ice forming inside of the plate heat exchanger is genrating a pressure drop that is to high for the current airflow.
This detection requires a Modbus pressure sensor placed on the heat exchanger and that the modulation
of the fans speed is based on the airflow and not on torque
• When the previous detection is not available, the supply T° is checked and if it falls below 11°C, it is considered
that is due to the ice that reduces the heat exchanger efficiency
- Effects:
8.22 TYPE 20: ALARM INDICATING THAT THE DEFROST PROCESS IS ACTIVE
TAC5 control board
AL1 relay
O.R.1
LED ALARM
LED AF
Fans
/
/
ON
ON
Supply stopped
Auto reset: yes
Displayed on HMI
Text displayed
LED ALARM
LED Pa
A.20
Defrost
RED
/
Содержание GLOBAL LP FW
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