Wiring; Maintenance And Repairs; Routine Maintenance; Periodical Maintenance - Techno Block AT Notice De Mode D'emploi Et D'entretien

10.

Wiring

A wiring diagram, specific for the units of the AT series, is enclosed with these use and maintenance
instructions.
11.

Maintenance and repairs

Suitable maintenance is crucial for obtaining longer life, perfect working conditions and high efficiency of
the unit as well as for ensuring the safety features provided by the manufacturer.
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Routine maintenance

Good operation of the unit requires the condenser to be cleaned periodically (frequency of cleaning
depends on the environment where the unit is installed).
Turn off the unit and clean it by blowing air from the inside outwards. Should no air jet be available, use a long-
haired brush and work on the outside of the condenser.
In case of water-cooled condensers have the unit cleaned by a plumber with special descaling agents.
WARNING
Use safety gloves to protect your hands from possible cuts.
WARNING
Disconnect the unit before working on it.
12.1

Periodical maintenance

Periodically check wear condition of electrical contacts and remote switches; if necessary replace them.

12.2 Service operations to be carried out by qualified technicians or by the manufacturer

Following operations shall be carried out by qualified technicians or by the manufacturer exclusively. Under
no circumstances the user is allowed to:

12.3 Troubleshooting

During operation following troubles may occur:
1 Compressor stops. The unit is equipped with an overtemperature device which stops the
compressor every time the max. allowable temperature of motor windings is exceeded.
Possible causes are:
2
•
replace electrical components
•
work on the electric equipment
•
repair mechanical parts
•
work on the refrigerating system
•
work on the control panel, ON/OFF and emergency switches
•
work on protection and safety devices.
- insufficient ventilation of the room where the unit is installed;
- anomaly in mains voltage;
- faulty operation of condenser fan.
Device reset is automatic.
Ice forms on the evaporator preventing air from flowing regularly.
Possible causes are:
- the door is opened too frequently;
- faulty operation of evaporator fan;
- faulty solenoid valve (in models with hot gas defrost);
- faulty defrost heater (in models with electric defrost);
- faulty defrost process. In this case some measures can be taken:
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