Riello 20161608, Installation And Technical Service Instructions

Page: 62 / 68

62
MAINtENANCE
4 MAINTENANCE
4.1 Ordinary maintenance
To ensure maximum efficiency and reliability of the units, it is
recommended to establish a maintenance contract with your
local service organization. The contract provides for regular in-
spections carried out by the service experts, so that any mal-
function is detected and corrected quickly, and that no serious
damage can occur.
A service maintenance contract is the best way to guarantee the
maximum operating life of the equipment and, through the ex-
perience of the technicians, it is the ideal way to manage the
system effectively also from a cost point of view.
Maintenance of air conditioning equipment must be carried out
by professional technicians, while routine checks can be per-
formed locally by specialized technicians. See EN 378-4 or ISO
5149 standard.
All refrigerant charge, removal and discharge operations must
be carried out by qualified personnel and with the correct ma-
terial for the unit. Any inadequate handling can lead to uncon-
trolled fluid or pressure losses.
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before carrying out any work on the machine, make sure
that the power supply is turned off. If a refrigerant circuit is
opened, it must be completely discharged, refilled and test-
ed to check for leaks. before any operation on a refrigerant
circuit, it is necessary to remove the full refrigerant load from
the unit with a refrigerant recovery unit.
A simple preventive maintenance will allow to obtain optimal
performance of the unit:
—
better cooling and heating performance
— decrease in energy consumption
— prevention of accidental component failure
—
prevention of the main interventions in terms of time and
costs
— envaironmental protection
There are different levels of unit maintenance.
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Any deviation or non-compliance with these maintenance
criteria will void the warranty conditions of the unit and the
manufacturer can no longer be held responsible.
4.1.1 Maintenance level 1
See note in the paragraph "Maintenance level 3 (or high-
er)"
p. 62.
Simple procedures can be performed by the user on a weekly
basis:
— Visual inspection for traces of oil (sign of a refrigerant leak)
— Cleaning the air heat exchanger
— Check for the presence of protective devices removed, and
poorly closed doors or casings
— Check the unit's alarm report when the unit is not in oper-
ation (refer to the control panel user manual)
— General visual inspection for any signs of deterioration
— Check that the water temperature difference between the
exchanger inlet and outlet is correct
4.1.2 Maintenance level 2
This level requires specific know-how in the electrical, hydronic
and mechanical sectors.
The frequency of this maintenance level can be monthly or year-
ly depending on the type of verification.
Under these conditions, the following maintenance work is rec-
ommended.
Perform all level 1 operations, then perform:
Electrical checks
— At least once a year, tighten the electrical connections of
the power circuit (see table "Tightening torque for main
electrical connections"
p. 63).
— If necessary, check and retighten all control / command
connections (see table"Tightening torque for main electri-
cal connections"
p. 63).
— If necessary, remove the dust and clean the inside of the
control units.
— Check the status of the contactors, switches and capaci-
tors.
— Check the presence and condition of the electrical protec-
tion devices.
— Check the correct operation of all electric heaters.
— Check that no water has entered the control unit.
Mechanical checks
— Check the tightening of the fixing bolts of the fan column,
the fan, the compressor and the control unit.
Checks on the water circuit
— Always be careful when working on the water circuit and
make sure that the adjacent condenser is not damaged.
— Check the hydraulic connections.
— Check the expansion tank for signs of excessive corrosion
or gas pressure drop and replace it if necessary.
— Drain the impurities from the hydraulic circuit.
— Clean the impurities of the water filter.
— Examine the fixed speed pump bearing after 17500 hours
of water operation and the mechanical pump seal after
15000 hours. Check the operation of the low water flow
safety device.
— Check the condition of the thermal insulation of the pipes.
— Check the concentration of the anti-freeze protection solu-
tion (ethylene or propylene glycol).
Cooling circuit
— Clean the air heat exchangers completely with a low pres-
sure jet and a biodegradable detergent.
— Check the operating parameters of the unit and compare
them with the previous values.
— Perform an oil contamination test. If necessary, replace the
oil.
— Check the operation of the high pressure switch. Replace
it if broken.
— Keep and maintain a maintenance sheet for each unit.
All these operations require strict observance of the safety
measures: personal protective clothing, compliance with all
sector regulations, compliance with applicable local regula-
tions and use of common sense.
4.1.3 Maintenance level 3 (or higher)
At this level, maintenance requires specific skills / approval /
tools and know-how and only the manufacturer, its represent-
ative agent or authorized agent are authorized to carry out these
operations. These maintenance operations concern for example:
—
The replacement of main components (compressor, evap-
orator)
— Any intervention on the refrigerant circuit (handling of the
refrigerant)