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IOM_WPHBA HE-WPHA HE_091a1201_207815_180701_EN
HORIZONTAL WATER-AIR COMPACT PACKAGED UNITS
WPHA HE / WPHBA HE
MAINTENANCE
It is advisable to do maintenance works every 1.000 operating hours as well as at the beginning of each cooling season.
Refrigeration circuit:
Check for oil or refrigerant leaks, noises or system’s vibration. Take measurements of
temperatures and pressures of components and record them on the maintenance form.
Electrical circuit:
Make sure that all electrical connections
–wires, contactors and terminals- are properly tight.
Record the readings for volts and amperes of each compressor and fan motor. Verify the starting current. Check
the good operation of all relays, pressure switches and phase sequence relay of Scroll compressor
.
Fans:
Check the direction of rotation of the fans and examine the support of them. Verify the operating status.
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Before handling the fan, make sure that it is completely stopped and disconnected from the mains, even if it is
already stopped and no one can start it during the intervention.
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Regular inspection of the device is necessary. The frequency of it, must be taken based on the degree of dirt in
propellers, turbines or impellers. The dirt in impellers (propellers or turbines), motors and grids can involve risks
and shortens significantly the life of the fan.
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Keep the fan's air circulation paths clear of obstacles - danger due to shot out objects!
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It is necessary to check the free passage of condensation water evacuation holes (if they exist) suitable for the
assembly position.
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In cleaning operations be very careful not to unbalance the propeller or turbine.
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If the cleaning work is carried out improperly, in the case of non-painted / painted fans, no guarantee is assumed
as regards the formation of corrosion or adhesion of the paint.
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To prevent humidity accumulation in the motor, before the cleaning process, the fan must operate for at least 1 hour
between 80 and 100% of the maximum number of revolutions!
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After the cleaning process, the fan must work for 2 hours between 80 and 100% of the maximum number of
revolutions to dry!
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Check the fan for mechanical vibrations at regular intervals (recommended every 6 months). Be aware of the limit
values indicated in ISO 14694 and carry out relief measures in case of exceeding these (e.g., the subsequent
balancing by expert personnel).
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Check if there are cracks in the impeller (propeller or turbine), especially in the welding seams.
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Motors and fans do not need any additional lubrication "thanks" to the use of lubrication for life. After the useful life
of the grease expires (30-40,000 h approx.) a change of bearings is required. In view of that, as for any fault (e.g.
in the winding or in electronic systems), please contact our technical assistance department.
Air filters
: Clean air filters after 4 hours of system operation and every 3 months (or more depending on application).
Filters can be cleaned by immersion in warm water with soap, later washed in clean water and dry.
Coils
: At least once a year, clean 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.
Drainage system
: Verify condition and good operation of the drainage tray and drain trap. It is necessary to clean
the condensates trays after the first day of operation. Then, clean it at least once a year. Take into account the
meteorological conditions, e.g. in places where falling leaves or the flight of seeds can plug the drain trap, it will
also be necessary to clean them at mid and late spring and autumn. The dates are approximate and will depend on
the blooming, falling leaves, seeds, etc. of the plants of the zone or the human activity or any other cause.
Hydraulic Circuit:
Check for water leaks, as well as noise and vibrations of the system elements. Record water
pressure values at the inlet and outlet of the pump.
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Clean the filter and the flow switch, it should be done frequently enough to avoid deposits that could block them.
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Make sure you know and comply with all local laws and regulations that affect the maintenance of water facilities.
Before performing any service or maintenance operation it is mandatory to turn off the main power switch of
the system to avoid any personal injuries. Locked it so that nobody other than a qualified technician can
switch on electrical power.
Read the SAFETY PRECAUTIONS!
WARNING!
