58 EN/39B/06.2018 © STULZ SpA – all rights reserved
SAL
ATTENTION
Spare filters must have filtering medium with the same thickness and density as the original one.
A set of spare filters can be ordered to your local STULZ service partner.
Replacing free cooling damper motor (if free cooling module is present)
To replace the motor of the free cooling damper, unscrew the 2 fixing screws of the damper motor
box on the right side of the free cooling module. Then, pull the box and replace the motor.
Replacing free cooling damper motor
Cleaning the heat exchangers
Blow compressed air through the heat exchanger in the opposite direction to that of the air flow
during normal operation. Please take care to avoid contamination of the aluminium surface with
reactive dust, chemical elements, other metal particles and ions.
Fans
The bearings of the fans are lifetime lubricated and do not need maintenance. Check the operation
current. An increased operation current indicates either a higher air resistance by a clogged pre-
filter or a winding short circuit in the fan motor.
8.2.2. Refrigerant circuit
High pressure switch
High pressure switch is a safety device, therefore its correct intervention must be verified regularly.
To do this, simulate a pressure increase. If the high pressure switch intervenes at a higher pressure
than 32,4 bar (original intervention value +10%), it must be immediately replaced with a new switch
with the same intervention point.
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