Zehnder EASY 5.0
34
Id
Description
Class
Time
limit
Action
Value/thres-
hold
Details/explanations
Possible causes
83 Return air fan
difference alarm
C
30
mins
LOBBY:
50Pa
MAC2/
QUATTRO:
depends
on the unit
size, see
table below
The measured air volume
or the measured pressure
has exceeded the
threshold value beyond the
specified time limit (30
mins). The threshold value
is equal to the current
se/- threshold
value.
LOBBY: (example: current
setpoint = 120Pa)
70Pa < Pressure < 170Pa
MAC2/QUATTRO:
(example current setpoint
= 1000 m3/h)
700m3/h < volume flow <
1300m3/h
See alarm Id= 6 Return air fan
(VAR) fault
86
Supply
temperature too
high
A
5s
Normal
stop*
55°C
The supply air volume has
become far too low in
relation to the power
supplied by the heating
coil.
The unit stops when the
alarm is triggered. To
restart, the temperature
must fall below 55°C and
the alarm must be
manually acknowledged.
Supply air fan VAS defective.
The unit's isolation damper and
the network dampers remain
closed.
Static relay for electric coil
control is defective.
113 Operation in
manual mode
C
1s
This alarm does not stop
the unit but it is necessary
to stop the unit to switch
the outputs to manual
mode. In order to restart
the unit, all outputs must
be in auto mode.
115 Supply air fan in
manual mode
C
1s
The corresponding actuator is
under manual control.
116 Return air fan in
manual mode
C
1s
117 Heating coil in
manual mode
C
1s
118 Exchanger in
manual mode
C
1s
The corresponding actuator is
under manual control.
119 Cooling coil in
manual mode
C
1s
125
Motorised fresh
air isolation
damper in
manual mode
C
1s
126
Motorised
exhaust air
isolation
damper in
manual mode
C
1s
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
