Swegon CLASS UNIT Operation & Maintenance Instructions Manual page 39

7.15 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT – FANS STOPPED T°
- Conditions:
• Frost protection is only selected for 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:
A.11 Anti-freeze - Fans stopped
AL1 relay
Alarm status
7.17 TYPE 15 BIS: ALARM INDICATING THAT THE COMFORT T° IS TOO HIGH
RELATIVE TO SETPOINT T°
- Conditions:
• Only with post cooling option
- Causes:
• The comfort T° setpoint cannot be reached (actual T° lower than setpoint during 15 minutes, or 30 minutes
if comfort on T2 instead of T5, while post cooling is at maximum).
- Effects:
S.60 Post-cooling - T° of the supply air too high
AL1 relay
/
Operation and maintenance
Displayed on HMI TACtouch
Text displayed
O.R.1
/
Manual reset mandatory.
Displayed on HMI TACtouch
Text displayed
O.R.1 relay of SAT3
/
instructions – CLASS UNIT TAC5
TAC control board
LED ALARM
ON
TAC control board
LED ALARM
ON
Auto reset: yes
LED ALARM
RED
LED AF
Blinking Stopped
LED ALARM
RED
LED AF
/
LED Pa
/
Fans
LED Pa
/
Fans
/
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