64
Zehnder Eversky
21.7. List and meaning of alarms
No.
Display
Class
Time
Threshold
Action
Conditions
Causes
(There may be several causes)
59 CO₂ sensor error
A
5s
Doesn’t stop
Analogue input UAI4 has
detected an implausible
signal (open circuit or
short circuit) for more
than 5s.
The CO₂ sensor is defective (short-
circuited or open circuit).
The CO₂ sensor is incorrectly wired
(see XVIII GENERAL WIRING
DIAGRAM).
85
Output in
Manual mode
A
5s
Off
At least one DO output
has been switched to
manual mode for more
than 5s.
The machine is stopped
when the alarm is
present. Outputs that
have been switched to
manual mode must be
switched back to
automatic mode and the
alarm manually
acknowledged before the
machine can be
restarted.
In the Manual/Auto menu, all functions
must be in "Auto" mode.
86
Conducting
the
maintenance
visit
C
5s
Doesn’t stop
The maintenance visit
alarm counter has
exceeded the
programmed time (12
months).
See chapter
Fehler!
87
Additional
output Y4
C
5s
Doesn’t
stop
Output DO6, which
controls the fresh air
preheating coil, was
switched to manual mode
for more than 5s.
The machine is not
stopped when the alarm
is present, the alarm
disappears automatically
when the output is
switched back to
automatic mode.
In the Manual/Auto menu, all functions
must be in "Auto" mode.