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Operation and maintenance instructio
ns – CLASS UNIT TAC5
Operation and maintenance instruction
s – CLASS UNIT TAC5
7.0 Troubleshooting
- Conditions:
- Causes:
• Failure of fan Fx. This problem is usually caused by the fan motor.
If not, the failure may be caused by an internal cable (control or power) or by the TAC circuit.
- Effects:
The TAC control board generates and reports 18 types of alarms.
The alarms are subdivided into auto resetting and non-auto resetting alarms. For the latter, a reset will be
necessary once the problem has been resolved.
For each type of alarm, a full text description will be displayed on the user interface depending on the alarm type:
- Activation of contact relay (NC or NO contact)- AL 1
- Activation of SAT3 OR1 in case of pressure alarm, provided that the optional module SAT 3 is installed on the control board.
- “Alarm”, “Pa” and “AF” activated LED’s on control board
- Alarm on user interface.
- Alarm communication with networking modules provided that an optional communication module
(Modbus RTU, MODBUS TCP/IP, and KNX) is installed on the TAC control board.
7.1 TYPE 1: ALARM INDICATING A FAN FAILURE
Displayed on HMI TACtouch
Text displayed
LED ALARM
LED Pa
B.11
Fan 1 failure
RED
/
B.12
Fan 2 failure
B.13
Fan 3 failure
B.14
Fan 4 failure
TAC control board
AL1 relay
O.R.1
LED ALARM
LED AF
Fans
Alarm
/
ON
/
stopped
Auto reset: yes
- Conditions:
• Mode airflow control or demand control.
• External pressostat connected on IN2 input
- Causes:
• Pressure alarm setup in airflow control or demand control mode
• External pressostat connected on IN2 input has triggered
- Effects:
*
unless the status has been changed in advanced setup
7.2 TYPE 2: ALARM ON THE PRESSURE VARIATION
Displayed on HMI TACtouch
Text displayed
LED ALARM
LED Pa
P.10
Pressure alarm - Supply air
/
RED
P.20
Pressure alarm - Extract air
S.40
Pressure alarm from Pressure Switch*
TAC control board
AL1 relay
O.R.1
LED ALARM
LED AF
Fans
/
Closed
ON
/
Run*
Auto reset: yes
