Swegon GLOBAL PX Operation And Maintenance Instructions page 50

8.15 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT – FANS STOPPED T°
- 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 TAC5
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:
A.11 Anti-freeze - Fans stopped
AL1 relay
Alarm status
50
Displayed on HMI
Text displayed
TAC5 control board
O.R.1 LED ALARM
/
Manual reset mandatory.
LED AF
ON Blinking
Operation and maintenance instructions – v2.8.8 & 2.7.3
LED ALARM LED Pa
RED /
Fans
Stopped