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Fault: Fans do not operate.
Fault message:
All 3 LEDs at the RB-ZF4 flash. The fault
message appears immediately and goes
out after approx. 1 minute.
Cause
Frost protection
temperature sensor
failed (not connec-
ted, cable break or
short-circuit).
Fault: Fans do not operate.
No fault message:
All LEDs at the RB-ZF4 are switched off.
Cause
Differential
pressure controller
has triggered.
Front shutter
opened.
Device powered-
off.
Rectification
Check
connection.
Check frost
protection
temperature
sensor.
Exchange it if
necessary.
Rectification
Check the differ-
rential pressure
controller.
Determine the
reason why it
triggered. If
necessary,
exchange the
differential
pressure
controller.
Check fuse.
Check front
cover.
8. Installation preparations
8.1 Transport
The ventilation unit is delivered on a palette.
● Adhere to the valid safety and accident
prevention regulations for transportation.
● The permitted maximum load for lifting
gear, chains, ropes, etc. must be sufficient
for the total weight of the ventilation unit.
● Nobody should ever stand under a
suspended load.
8.2 Requirements at the installation
site
● Room with an ambient temperature from
+ 10...+ 40 °C, e.g. in the cellar or in the
loft.
● Level, hard installation surface. This is
important in order to avoid vibration-based
noises.
● Siphon for condensation run-off. Sufficient
incline for the condensation drain.
Condensation drain with drain tap.
● Working room for operative and mainte-
nance work: at least 70 cm in front of the
unit.
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