Swegon ESENSA PX TOP Operation & Maintenance Instructions Manual page 16

6.19 TYPE 18: ALARM INDICATING AN INCORRECT POSITION OF THE MODULATING
BYPASS RELATIVE TO THE ORDERED POSITION
- Conditions:
• PX units with modulating bypass
- Causes:
• This alarm indicates that the modulating bypass has not reached the ordered position within 10 seconds.
The most common reason for this is a damaged position sensor on the bypass actuator, and this must be replaced.
Other reasons may be that the control board output is damaged, implying the replacement of the board, or a
mechanical blocking verified by a visual inspection of the bypass
- Effects:
Displayed on HMI TACtouch
Code Text displayed
B.20 Position of the modulating bypass incorrect
TAC control board
ALARM OUTPUT AL dPa OUTPUT
Alarm Status /
Manual reset mandatory.
Diagnostic :
Stop the unit, do an alarm reset, check and eventually correct actuator wiring to the control board and then check that the
bypass can move physically: connect IN3 to +12V to force the bypass to open.
• If the bypass stays in close position, check if there is some mechanical obstruction that makes the actuator stuck,
otherwise:
-Either the actuator must be replaced.
-Or the control board must be replaced.
• If the bypass opens completely:
- Do several Close/open cycle using IN3 to try to reproduce the alarm and check bypass position in info
menu. If the problem cannot be reproduced, try with fans boosting.
- Either the actuator must be replaced.
- Or the control board must be replaced.
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GB.ESENSA.MO.231025
Level
3
LED ALARM Fans
ON Stopped
We reserve the right to alter specifications.
6.20 TYPE 19: ALARM INDICATING THAT THE HOURS LIMIT FOR THE MINOR MAINTENANCE HAS
BEEN REACHED
- Conditions:
• The hours limit must be configured with a value greater than 0.
- Causes:
• The hours limit for the minor maintenance has been reached.
The instructions in this manual of the unit for the 3 months maintenance should be followed. Mainly, the filters should be
cleaned or replaced.
Reset the hours for minor maintenance after this operation, this will reset automatically the alarm and give it again after the
same period.
Effects:
Displayed on HMI TACtouch
Code
M.10 MINOR MAINTENANCE ALARM
TAC control board
ALARM OUTPUT AL dPa OUTPUT
/ /
Auto reset: via dedicated reset
6.21 TYPE 20: ALARM INDICATING THAT THE DEFROST PROCESS IS ACTIVE
- Conditions:
• Unit with counter flow heat exchanger.
- Causes:
• The ice forming inside of the plate heat exchanger is genrating a pressure drop that is too high for the current airflow.
This detection requires a Modbus pressure sensor placed on the heat exchanger and that the modulation
of the fans speed is based on the airflow and not on torque.
• When the previous detection is not available, the supply T° is checked and if it falls below 11°C, it is considered
that is due to the ice that reduces the heat exchanger efficiency.
- Effects:
Displayed on HMI TACtouch
Code
A.20 Defrost
TAC control board
ALARM OUTPUT AL dPa OUTPUT
/ /
We reserve the right to alter specifications.
GB.ESENSA.MO.231025
Text displayed
LED ALARM Fans
ON /
Text displayed
LED ALARM Fans
ON Supply stopped
Auto reset: yes
www.swegon.com
Level
1
Level
1
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