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Operation and maintenance instructions
- Conditions:
• Frost protection is only selected for PX units with electrical preheating (KWin) or water preheating (BAin) or if modulating
bypass.
- Causes:
• With KWin or BAin option: in certain air T° conditions as measured on the exhaust airflow after the heat recovery,
indicating that the internal electrical KWin coil or external hydraulic coil (BAin) has reached its limit, the TAC
control can take over to guarantee the anti-frost function.
If T° < -5°C during 5 minutes, fans are stopped.
• With modulating bypass in frost protection (« A-FREEZE » or « AF+FREECOOL » in the advanced setup),
this alarm indicates that the extracted air temperature at the exchanger output (T3 sensor) has not exceeded 1°C
during 15 minutes after that the bypass has been opened at 100%.
- Effects:
8.14 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT – FANS STOPPED T°
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
Alarm status
/
ON
Stopped
Manual reset mandatory.
- Conditions:
• Only for RX units
- Causes:
•
This alarm indicates that the rotation speed of the wheel has been lower or greater than 15% of the setpoint
speed for more than 5 minutes
- Effects:
8.15 TYPE 14 BIS: ALARM INDICATING AN ERROR ON THE HEAT EXCHANGER ROTATION SPEED
TAC control board
ALARM OUTPUT
AL dPa OUTPUT
LED ALARM
Fans
Alarm status
/
ON
Stopped
Manual reset mandatory.
Displayed on HMI TACtouch
Code
Text displayed
Level
A.11
Anti-freeze - Fans stopped
3
Displayed on HMI TACtouch
Code
Text displayed
Level
B.30
Speed of rotation of the exchanger incorrect
3
