O P E R AT I N G A N D I N STA L L AT I O N I N ST R U CT I O N S SYST E M V E N T E C H LG 5 0 0 P
PAG E 4 4
Before commencing work on
the fans, power to the device
unit must be disconnected and
the device secured against being swit-
ched on again!
Die Wartungs- und Reinigungsarbei-
ten am Ventilator beschränken sich
ausschließlich auf das Ventilatorge-
häuse und das Laufrad. Maintenance
and cleaning work on the fan is limited
exclusively to the fan housing and the
impeller. Cleaning may be required
depending on the degree of the contami-
nation of the fans.
Opening of the motor housing
and working on the electri
cal components in the motor
must be performed only by the manu-
facturer of the fan. In the event of fan
defects, this should be replaced with a
new original fan.
To clean the fans, the 4 fixing screws on
the fan housing should be removed. The
fan has to be carefully pulled out of the
housing. Attention has to be paid to the
electrical connecting cable to the motor.
It must not incur any damage.
A soft brush has to be used to clean the
fan blades. The fan housing is cleaned
with a vacuum cleaner.
Damage to the rotating blades must be
avoided. Any balancing weights pre-
sent must not be removed or damaged,
otherwise imbalance of the impeller will
take place in operation and an increased
noise level and vibrations can occur as
a result.
11.4.2 Fans
Depending on the degree of contamina-
tion of the heat unit, cleaning is recom-
mended at least annually.
Prior to working on electrical
heater batteries, all poles of
the ventilation unit have to be
switched to voltage-free and secured
against being switched back on!
The fins on the battery must not incur
any damage in the course of the cleaning
work. A vacuum cleaner or soft brush
should be used to remove dust.
During cleaning work to external elec-
trical pre-heater batteries, the supply
air should always be inspected, where
present, and replaced if contaminated.
11.4.3 Electrical PTC preheater battery
(optional)
Illustration: PTC low temperature preheater battery
