MULTIFUNCTIONAL UNITS RLC – Installation and maintenance manual
MUMRLCHEAT_REV01_1012_UK
Pag. 29 di 31
14.5
Power supply to the auxiliary circuit
The power supply to the auxiliary circuit is 24V for all the units. Connection to the power circuit is inside the panel and is carried out in the
factory. The compressor oil heaters, the protections against compressor over temperature and the cooling water safety indicator are
connected so as to always be operative, as long as the electrical panel is power supplied.
15
Maintenance
Maintenance operations are fundamental in order to keep the units running properly, both purely functional and energetically points of
view.
Every Thermocold unit comes with a logbook, in which the user or the person delegated to machine maintenance can keep all the required
notes, in order to keep a historical log of the Thermocold unit.
A lack of notes in the logbook could be considered proof of careless maintenance.
15.1
Sight check of the under pressure vessels state
The risks due to the pressure inside the circuit have benne eliminated or (when it is not possible) reduced by means of safety devices. It is
important to check periodically the status of these devices and to carry out the components inspections and replacement as follows.
Check at least once per year the under pressure vessels state.
It is important to check that the surface does not get rusty and that neither corrosion nor deformations are visible.
In case the superficial oxidisation and the corrosion are not properly controlled and stopped in time, cause a thickness reduction with a
consequent reduction of the vessel mechanical resistance.
Use antioxidant paint or products to protect.
Description of the operations
Recommen
ded
frequency
Control of compressor oil level
monthly
Control of the suction temperature
(superheating)
monthly
Control of the hydraulic circuit water
filling
monthly
Control of electric absorption fan motors
and compressor
monthly
Control of power supply and auxiliary
power
monthly
Control of refrigerant charge through
liquid sight glass
monthly
Control of the state of the carter electric
heaters
monthly
Carrying out tightening of all the electrical
connections
monthly
coil cleaning
seasonal
Control of the functioning of the
compressor solenoid valves and liquid
line
Six-montly
Control of the setting of the regulation
and safety thermostat
Quarterly
Control of the state of the fan and
compressor contactors
Quarterly
Functional test of the evaporator heater
Quarterly
Noise control of the engine and fan
bearings
Six-montly
Pressure tank state checking
yearly
Cleanness control for coils and air-filters weekly
Further operations for units with centrifugal fans
Control of the cleanliness of the
discharge and circulation ducts
yearly
Control of the correct functioning of
possible dampers or inlets
Six-montly
Control of the lubrication of the
shaft bearings
Six-montly
Control of the pulley - engine and
pulley - fan alignment
seasonal
Control of the tension of the
transmission belts; if they are
excessively worn they should be
replaced
Quarterly
Check that the rotor is centred on
the shaft and that it does not touch
the Archimedean screw
Quarterly
Control of cleaning if necessary of
the fan rotor and Archimedean
screw
yearly
Control and if necessary tightening
of the blocking screws of the engine
pulley
Quarterly
Control of the presence of
excessive or unusual vibrations
Six-montly
Control of the fan joint seal - outlet
Six-montly
Control of the current absorption of
the three engine phases
Montly
