57 © STULZ SpA . – all rights reserved EN/39B/06.2018
SAL
Interval Operation
Every month • CONDENSATE DRAIN: check that the condensate drainage system is perfectly clean and operational.
• FANS: check that the fans do not show signs of overheating or abnormal vibrations and that they turn freely.
• AIR FILTER: check the air filter, clean it or replace if necessary (dirty filter alarm). If you decide to change the filter,
the medium and thickness of the spare must be the same as the original. A set of spare filters can be ordered to
the STULZ service dept.
• HEAT EXCHANGERS: check that the exchangers are perfectly clean and efficient.
Every 6 months • REFRIGERANT CIRCUIT: sight glass.
• REFRIGERANT CHARGE: check that the system is properly filled. If it is not filled then search for the leak (check
joints in particular), repair it and refill the system.
• FREE COOLING DAMPER (if free cooling module is present): check tightness of fixation of air deflector.
Every year • COMPRESSOR: check the oil level from the compressor indicator.
• ELECTRIC CIRCUIT: check that the electrical connections are tight and that the remote switches and the general
switch are operational and in good condition. Also check that the control board works and perform an alarm signal
test.
• MECHANICAL PARTS: clean the internal parts of the system.
• SAFETY DEVICES OF REFRIGERANT CIRCUIT: high pressure switch.
Only skilled personnel may repair, inspect or maintain the cooling units.
Unskilled staff may only replace the filter; all other operations must be performed by personnel who
are experienced and qualified in the maintenance of cooling systems.
Before servicing this unit, refer to the instructions contained in this manual, check the data on the
data plate and follow any other precaution to ensure optimum safety.
8.2.1. Air circuit
Replacing air filters
For internal air filter, proceed as follows:
• On the bottom side of the evaporating unit, open the panel nearest to the rear side. To remove the
filter, rotate the proper locking device.
• Extract the air filter and replace it.
Replacing air filter
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