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© STULZ SpA . – all rights reserved EN/36B/08.2018
• Check the current that is absorbed by the compressor, fans and other optional components,
comparing these values with those indicated in technical specifications.
• Check the direction of rotation of the compressor, as indicated in the previous chapter (electric
installation section). If it is incorrect, invert the wires.
• When the system is operating at normal capacity: 1) check that there are no alarms; 2) check that
the air discharged from the condenser flows correctly without being drawn into the cooling unit;
3) check that the fans work properly; 4) check, with the unit operating, that power supply voltages
remain inside the values indicated on the technical data label for the unit; 5) check that the unit
operates according to the set logic.
Shutdown
To shut the unit down, disconnect it from all its power supplies using the related isolating switches.
DANGER
The ON-OFF key on the C2020 display (if present) is only used to put the unit on stand-by. It must
not be thought to be a safety component to turn the unit off prior to performing maintenance.
8. Maintenance
8.1. Safety instructions
Installation and intervention on air conditioners must be made in full compliance with specific
national regulations for accident prevention, with particular reference on electric and refrigerant
equipment. Failure to comply with these regulations might be dangerous to people and environment.
Before any intervention on the unit, refer to instructions on this manual, check data on the name-
plate and take any other precaution in order to guarantee optimal safety.
Maintenance operations must be made by authorized and skilled personnel.
Safety procedures
DANGER
Cut off the power supply to the unit before making any maintenance operation. A “DO NOT
SWITCH ON” warning sign must be clearly visible. ON-OFF key on C2020 display (if present) is
only used to put the unit is stand-by. It must not be considered as a safety device to switch off
the unit before maintenance.
Live electric components have to be switched to de-energized and checked to ensure that they
are in the de-energized state.
Some verifications must be effected with the unit in operation (measuring current, pressures,
temperatures). In such a case, the unit must only be switched on at the master switch after all
mechanical connections have been carried out. The unit must be switched off immediately after
the measuring procedure.
The electric box might be hot.
Very little routine maintenance is necessary to keep the unit in reliable operating order and protect
its moving parts. This maintenance, however, must be performed at the prescribed maintenance
intervals. Failure to perform due maintenance both decreases the working life and efficiency of the
unit and also invalidates guarantee coverage.
