Mitsubishi Electric s-MEXT-G00 Manual De Instalación, Uso Y Mantenimiento página 28

s-MEXT-G00
Whenever measurements must be taken or checks performed with the machine running, it is
necessary to:
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make sure that any remote control systems are disconnected; be aware that the PLC
on the machine controls these and can enable and disable the components, posing a
degree of danger (for example, by powering and running the fans and their mechanical
systems, which can drag);

work on the open electrical panel for as short a time as possible;
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close the electrical panel as soon as the single measurement or check has been
performed;
Furthermore, the following precautions must always be taken:

the cooling circuit contains pressurised refrigerant gas: all maintenance must be
carried out by qualified personnel with the authorisations or certifications required by
the laws in force;

the fluids in the cooling circuit must not be dispersed in the environment;
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never keep the cooling circuit open, as the oil absorbs humidity and deteriorates;

when replacing electronic boards, always use suitable equipment (extractor, antistatic
bracelet, etc.);

if replacing a motor, coils or other heavy components, make sure that the lifting
equipment is suitable for the weight;

do not access the fan compartment without first isolating the machine by means of the
disconnecting switch on the electrical panel and clearly displaying a sign saying, "Do
not operate - maintenance in progress";

always use only original spare parts purchased directly from the Manufacturer or from
official dealers;
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before closing and restarting the machine, make sure to remove all tools or foreign
bodies.
The list of scheduled maintenance operations is shown in the next paragraph of this manual.
For each intervention, both of ordinary and extraordinary maintenance, a special form must
be issued and kept by the user.
If a Scheduled Ordinary Maintenance notebook is available on the machine, all the operations
carried out must also be recorded on the same.
7.2 SCHEDULED MAINTENANCE
Carry out all the scheduled maintenance activities at the indicated intervals.
INFORMATION
Failure to carry out regular maintenance will make the warranty null
and void and relieve the manufacturer of all safety related
responsibilities
OBLIGATION
To operate with the fans off, ensure a correct air ventilation by
opening the ventilation grids/doors or by using an external fan.
The scheduled maintenance activity intervals are indicated in the tables on the following
pages.
To "read" the hours of operation, they must be displayed on the microprocessor display.
7.3 GENERAL MAINTENANCE WORK TABLE
WORK TO BE CARRIED OUT
Check for display alarms
Visually check for refrigerant leaks
Evaporating coil cleaning
Check of fan remote switches
Check of electric connection tightness
Check for worn or damaged cables and replace as
necessary
Check the noise level of the fan bearings
Check the torque of bolts, moving components and
components subjected to vibration (e.g. fan anti-
vibration devices)
Check the cooling circuit for leaks.
Check for oxidized areas on cooling circuits.
Check the condition of hose pipes and capillary
tubes
Checking the operating parameters of the cooling circuits. For each circuit check:
Evaporation pressure compared with delivery air
temperature
The suction temperature
The suction overheated gas temperature
UM_s-MEXT_G00_01_Z_07_21_ML
WORK INTERVALS
Start of season
Start of season
Every Every 500
Every 1000 hours
day hours
Every 3 months
Every 2 months
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1 a year
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The ambient air temperature
Overheating
Subcooling
3-phase fan electric consumption (L1/L2/L3)
Air delivery and return temperature
Three-phase line voltage
Fan power supply voltage
Mass insulation
100% and partial operation power consumption
Hours of operation of individual components
Number of starts of individual components
(*) Unless otherwise required by applicable laws.
The frequency of the operations described in the table above should be considered
indicative.
In fact, it may undergo variations according to the method of use of the machine and the
system in which the latter is required to operate.
7.4 CLEANING AND / OR REPLACING THE AIR FILTERS
Air filter access: In all models (F1, F2, F3), the air filters are removed from the front access.
OVER
7.5 EXTRAORDINARY MAINTENANCE
In case of need of repairs, contact an Service Centre/Distributor-Branch authorized by the
manufacturer.
INFORMATION
Failure to comply with the above will make the warranty null and
void and relieve the manufacturer of all safety related
responsibilities.
OBLIGATION
Only use original spare parts (see the list of "Spare Parts
cathalogue").
7.5.1 REPLACEMENT OF DIRECT EXPANSION COIL WELL PROBES
(OVER ONLY)
Remove the air filter from the direct expansion coil
Remove the left side cover as indicated in the figure to access the probes.
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TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
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UNDER