Zehnder EASY 5.0
31
15.10. Alarm and fault table
Id
Description
Class
Time
limit
Action
Value/thres-
hold
Details/explanations
Possible causes
1
Supply air fan
(VAS) fault
A
30s Normal
stop*
ECO / DIVA:
25Pa
(pressure
switch
setting)
LOBBY:
25Pa
(control
system)
MAC2/
QUATTRO:
depends on
the machine
model (see
table below)
ECO/DIVA: the fan
operation feedback
information from the
pressure switch has not
been received within the
allotted time (30s), the
machine stops, and a
manual
acknowledgement of the
alarm is required to
restart. The air pressure
switch is type NO. It
closes when the air
pressure exceeds 25 Pa
(factory setting).
LOBBY: the air pressure
transmitted by the
pressure transducer did
not exceed the minimum
threshold (25Pa) within
the time limit (30s). The
minimum threshold is set
at 25Pa in the control
system.
MAC2/QUATTRO: the air
volume transmitted by
the volume transducer
did not exceed the
minimum threshold within
the time limit (30s). The
minimum threshold
depends on each
machine model (see table
below).
• Faulty fan
• Faulty fan power supply
• Speed control signal problem (HS
controller output, faulty wiring/
connection between fan and
controller, faulty controller AO
output, etc.)
• Moisture in the pressure tap tubes
• Poorly connected, inverted or
clogged pressure tap tubes
• Fresh air register remains closed
• Air distribution system: fire damper
closed, duct obstructed.
ECO / DIVA specific:
• Faulty pressure switch
• Pressure switch incorrectly set
• Faulty wiring/connection between
pressure switch and controller
• Speed setpoint too low in relation to
network pressure drop
LOBBY specific:
• Faulty pressure transducer
• Faulty wiring/connection between
pressure transducer and controller
• Air distribution network not
sufficiently resistant (machine not
connected, machine undersized)
MAC2 / QUATTRO specific:
• Faulty volume transducer
• Faulty wiring/connection between
volume transducer and controller
• Air distribution network too resistant
(closed damper/register, undersized
network, oversized unit)
• Clogged or unsuitable air filter (too
resistive)
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
