Periodical Maintenance; Service Operations To Be Carried Out By Qualified Technicians Or By The Manufacturer; Troubleshooting - Zanotti ZM Série Notice De Mode D'emploi Et D'entretien

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
ATTENTION
Do not use either hot water or any pointed, cutting, metal objects to remove ice blocks.
Unsatisfactory efficiency of the unit:
If no defects are found in the unit check that: cold room doors are perfectly tight; there is no
cold dispersion; the cold room is used wisely; no unfrozen liquids or foodstuffs are placed in the
low temperature room; the evaporator is ice-free.
We recommend installation of the machines far from the doors especially when the cold room is
expected to be opened many times a day.
WARNING:
Removal of protections during machine operation is absolutely forbidden. They have been
developed to safeguard the operator's safety.
• 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:
increase defrost termination temperature by some degrees, increase number of
defrosts.
3. Display does not light up. Check:
- if there is power to the unit;
- if mains cable is connected properly;
- fuses inside the electric panel
28