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10. Wiring
A wiring diagram, specific for the units of the SB 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.
Only authorized persons, who are certified in installing and maintaning refrigeration plants containing
flammable hydrocarbons, may do the installation and maintenance.
All requirements from local authorities, regarding use of hydrocarbons in refrigeration systems, must be fullfilled.
Only original Zanotti spare parts approved for the use with a flammable hydrocarbons may be used.
ATTENTION
The following list summarises several of the essential guidelines:
-
In all cases of indoor work the room venting system must be switched on
-
Pipe lines are to be inspected with regard of abnormal vibrations (danger of breakage)
-
During repairs, R290 can be entracte and use again, as long as no inert as in the system or other
contaminants exists. Before recharging, the system must be purged with nitrogen, install a new filter dryer
and then evacuate
-
The purging (if appropriate, burning off) of R290 can only be made under the necessary safety precautions.
-
Used dryers contain residual quantities of (flammable) R290. Purge with nitrogen and dispose of the dryer
as appropriate
-
Don’t use flame to close the circuit after the refrigerant charge. Close with appropriate caps.
-
For transportation of flammable refrigerant special regulations apply.
12 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:
•
replace electrical components
•
work on the electric equipment
•
repair mechanical parts
•
work on the refrigerating system
