Swegon CLASS UNIT Operation & Maintenance Instructions Manual page 38

7.13 TYPE 12: ALARM INDICATING THAT THE COMFORT T° IS TOO LOW RELATIVE TO SETPOINT T°
- Conditions:
• Only with post-heating 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 heating is at maximum.)
- Effects:
S.50 Post-heating - T° of the supply air too low
AL1 relay
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7.14 TYPE 13: ALARM INDICATING HEAT EXCHANGER FROST PROTECTION ALERT
- Conditions:
• Only with post-heating option
- Causes:
• For units:
Frost protection is only selected with electrical pre-heating coil (KWin) or water preheating coil (BAin) or modulating bypass.
With KWin or BAin option: In certain air T° conditions as measured on the exhaust airflow after 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° < assignment T°-1,5°C for more than 5 minutes: supply and exhaust airflow reduction of 33% if airflow control or
demand control and of 25%
if pressure control mode, for 15 minutes.
- Effects:
A.10 Anti-freeze - Reduced air flows
AL1 relay
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38
Displayed on HMI TACtouch
Text displayed
TAC control board
O.R.1 LED ALARM
/
Auto reset: yes
Displayed on HMI TACtouch
Text displayed
TAC control board
O.R.1 LED ALARM
/
Auto reset: yes
LED AF
ON
LED AF
ON
Operation and maintenance
LED ALARM
RED
Fans
/ /
LED ALARM
RED
Fans
ON
instructions – CLASS UNIT TAC5
LED Pa
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LED Pa
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