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IOM_UMXCBA-UMXCA_801.1a4502.2_208027_200201_EN
UMXCBA/UMXCA
CONDENSER UNITS WITH
COMPRESSOR AND AXIAL FAN
MAINTENANCE
It is advisable to do maintenance works every 1.000 hours as well as at the beginning of each cooling season.
In case of leakage, any manipulation and/or recovery of refrigerant must be carried out by qualified and
accredited personnel in the current legislation. Add the quantity of oil that has been lost.
CONSERVATION AND CLEANING
Electrical circuit
: Make sure that all electrical connections
–wires, contactors and terminals- are properly tight.
Register the readings of kW and amperes at each compressor and fan motor phase. Verify the starting current.
Check the start current. Check that all mechanical components, pressure switches and so on are working
properly.
Refrigeration circuit
: Check if there is any refrigerant leak, noises or vibration. Proceed to measuring
temperatures and/or pressures of components of the most important components of the system and register them
on the maintenance sheet (compressor discharge and aspiration
, expansion valve, exchangers’ inlet and outlet,
etc…).
Compressor:
Check regularly the lubricant level, the presence of vibrations or noise and the motor insulation.
Coils
: At least once a year clean the condenser coils with water and detergent, then dry with air at low pressure.
Never clean with a wire brush, water and/or air at high pressure (max. 6 bar).
Fans:
Check the direction of rotation of the fans, verify their carriers. Check the transmission elements and
the operating status.
Before working on the fan make sure that it is disconnected from the main power supply even though it is
already stopped and control that nobody may start it during the intervention.
-
A regular inspection of the unit is required to avoid dirt accumulation in propellers, turbines, motors
and grids that could entail risks and significantly shorten their life. The frequency will depend on the
working conditions.
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Keep the airways of the fan free
– danger of expulsion of objects!
-
Check the free flow of the condensation water through the evacuation openings is necessary (if
there are any).
-
During cleaning operations be very careful not to unbalance the propeller or the turbine.
-
In case of incorrect cleaning operations no guarantee is assumed regarding corrosion formation /
paint adhesion for unpainted / painted fans.
-
To avoid humidity accumulation in the motor the fan must be operated during at least 1 hour at 80
to 100% of its maximum speed before cleaning!
-
After the cleaning process the fan must be operated for 2 hours at 80 to 100% of maximum speed
for drying purposes!
-
Check the fan regularly to detect possible mechanical vibrations (recommended every 6 months).
Take into consideration the limit values stated in the ISO 14694 standard and take the necessary
correction measures in case of exceeding them (e.g. posterior balance by trained specialists).
-
Check the impeller in particular weld-seams to detect possible cracks.
The motors and the fans do not require additional lubrication due to the use of
“life-long lubrication” ball bearings.
At the end of the grease life period (30-40.000h approx.) the bearing shall be replaced. Please contact our
Service Department in that case as well as for any damage (e.g. to the coil or electronical parts).
Before performing any service or maintenance of the unit, it is mandatory to disconnect and lock
the system main switch to prevent anyone other than the technician from connecting the unit and
causing personal injury.
WARNING!