60 EN/39B/06.2018 © STULZ SpA – all rights reserved
SAL
ATTENTION
R407C must be charged in a liquid state.
After filling check the HP switch. An overfilling of the circuit makes the condensation pressure rise
and by that the power consumption of the compressor. In the extreme the HP switch triggers.
Compressor
In the compressor there is a polyester (POE) oil charge, which does not have to be renewed under
normal operation conditions and holds out for the unit’s lifetime. However, it is possible that the
oil, as it reacts hygroscopically, has taken up humidity of the air after repeated recharging of the
refrigerant circuit due to repair works. The interaction between POE oil and water results in the
formation of acid. Owing to hyper-acidity, corrosive processes take place inside the compressor. The
oil level can be checked by looking at the sight glass of the compressor.
ATTENTION
In case of topping up, use always the type of oil indicated on the technical data plate on the
compressor.
9. Troubleshooting
Please consider the safety considerations at chapter "Safety directions". All the operations
described below have to be done by authorized and qualified personal.
Problem Possible cause Possible solution
GENERAL
1. The controller and
the rest of the unit
don't work
Main power supply missing Restore power supply
Main switch open Close main switch
Power supply to the controller is missing Check voltage on power supply cables. Repair the
broken cable or restore the missing connection
Controller faulty Contact STULZ service
2. Controller is working
but display is not
working
Cable between controller and display disconnected Reconnect the cable
Cable between controller and display broken Replace the cable
Display faulty Contact STULZ service
3. Controller is working
but the rest of the
unit is not working
Faults blocking the unit Look for alarms on the display (see below). Contact
STULZ service
Controller faulty Contact STULZ service
ALARMS ON THE DISPLAY
4. Component x
thermic
Anomalous absorbed current by component x Contact STULZ service
Defective protection Contact STULZ service
5. Evaporator fan x
blocked
Evaporator fan broken Contact STULZ service
Fan cables disconnected Contact STULZ service
Wrong configuration of number of fans on C2020 Contact STULZ service
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