Swegon CLASS UNIT Operation & Maintenance Instructions Manual page 40

7.18 TYPE 16: ALARM INDICATING THAT THE SUPPLY T° IS TOO LOW
- Conditions:
• Only with post heating or cooling option
- Causes:
• This alarm indicates that the supply temperature (T5) is lower than 5°C. The fans are stopped for 1 minute.
The alarm is configurable through the advanced setup and is disabled by default.
- Effects:
S.50 Post-heating - T° of the supply air too low
S.60 Supply air T° too low - Fan stopped
AL1 relay
Alarm Status
7.19 TYPE 17: ALARM INDICATING HYDRAULIC COILS FROST PROTECTION ALERT
- Conditions:
• Only with internal hydraulic post heating coil (IBA), or external heating coil (EBA)
- Causes:
• Indicates that the anti-frost protection temperature of the hydraulic coil is lower than 4°C (configurable through
advanced setup, it is important to reduce this Setting for BAin coil if an antifreeze is in the fluid). The 3-way valve is
automatically opened at 100% for 15 minutes and the heating demand contact is closed (output SAT3 O.R.3). If the
AHU is running, the alarm is sent after 2 minutes for a preheating coil and immediately for the others; if the AHU is not
running, the alarm is sent after 5 minutes.
- Effects:
A.40 Anti-freeze protection of the internal post-heater (IBA)
A.41 Anti-freeze protection of the waterborne post-heater (EBA+)
A.42 Anti-freeze protection of the waterborne post-cooler (EBA-)
A.43 Anti-freeze protection of the waterborne reversible coil (EBA+-)
AL1 relay
Alarm Status
40
Displayed on HMI TACtouch
Text displayed
TAC control board
O.R.1 LED ALARM
/
Manual reset mandatory.
Displayed on HMI TACtouch
Text displayed
TAC control board
O.R.1 LED ALARM
/
Manual reset mandatory.
LED AF
ON
LED AF
ON
Operation and maintenance
LED ALARM
RED
Fans
/ Stopped
LED ALARM
Red
Fans
/ Stopped
instructions – CLASS UNIT TAC5
LED Pa
/
LED Pa
/