59
Zehnder Eversky
No.
Display
Class
Time
Threshold
Action
Conditions
Causes
(There may be several causes)
2
VAR fault
A
30s
Set value for LIFO
pressure switch
Unit stopped
The contact of the
runback pressure switch
of the return fan has
remained open for more
than 30s during normal
operation of the fan unit.
The UDI3 input must be
in closed state "Fer"
when the ventilation unit
is in operation, in the
open state "Ouv" when
the unit is off.
The pressure switch is of
type NO (normally open).
Return fan motorextractor hood
(extraction)°:
- Faulty
- Control signal 0-10 V inverted
- Faulty electrical wiring/connection
Fan control pressure switch:
- Faulty
- Poor electrical connection
- Poor air connection
- Incorrect setting (nominal factory
setting = 25 Pa)
- Faulty electrical wiring/connection
Transparent tubes for the fan control
pressure switch:
- Poor connection
- Presence of internal condensation
water. This may be due to a prolonged
shut-down of the unit, or repeated/too
many Start/Stop cycles. Set the
machine for continuous operation.
- Foreign matter or dust in the tube or
pressure tap.
The low speed and/or normal speed
setpoint is too low, and the fan speed
signal does not reach sufficient
pressure to switch on the fan control
pressure switch.
Motorised return air damper RRS
remains in closed position. Clogged
ductwork.
6
Filter 1 alarm
C
5s
Set value for
DEPFS filter
pressure
switch
When the machine is
running, the DI1 input
must be in the open state
"Ouv" when the state of
the filters is suitable, in
the closed state "Fer"
when the filters are dirty
(high filter pressure
drop).
The contact of the filter
pressure switch closed
for more than 5s during
operation.
The filter(s) are dirty and need to be
replaced.
The filter(s) is/are supplied by a third
party with pressure drop characteristics
not compatible with the machine.
The filter pressure switch(es) are
incorrectly connected.
Pressure switches are incorrectly set
(300 Pa setting for M5+M7 as
standard)
The connection of the transparent
tubes to the filter pressure switch is not
correct or there is water condensation
in the tubes.
