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07.17 207443 Rev.105
EKWXA│EKWXBA
AIR-COOLED WATER CHILLERS
AXIAL FANS
MAINTENANCE
CONSERVATION AND CLEANING
It is advisable to do maintenance works every 1.000 operating hours as well as at the beginning of each cooling season.
Coils:
At least once a year, clean condenser coils with water and detergent, then dry with air at a low pressure. Never clean with wire
brush.
Drainage system:
Verify condition and good operation of the drainage tray and siphon.
Refrigeration circuit:
Check for oil refrigerant leaks, noises or system’s vibrations. 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.
LUBRICANT
R-410A refrigerant compressors use synthetic polyolester oil. Each compressor manufacturer has a specific oil for your product.
The compressor or system should not remain open to atmosphere for more than 15 minutes.
Synthetic ester-type lubricants (POE, Polyol Ester) having high solubility with R-410A are used. Since these types of oils are very
hygroscopic, it should be more careful handling them than with conventional ones. Moreover, when these synthetic oils are mixed with
minerals or alkylbenzenes, they deteriorate causing capillary blockage or failure in the compressor.
Do not mix under any circumstances.
REFRIGERANT CHARGE
In case it is necessary to add or recover refrigerant, use an electronic scale that is suitably reinforced and prepared to withstand the
handling of the refrigerant bottle.
The charge must be made in LIQUID condition.
The inlet of liquid refrigerant R-410A in the empty tubes causes temperatures below 0ºC until the internal pressure reaches 7 bars.
Leaks should be repaired immediately.
Never overcharge the system.
Never use compressor as vacuum pump.
If leakage symptoms appear during the operation, it is necessary to leak test.
To find small leaks, you will need a detector for HCF.
If gas leak is detected is necessary to remove and recuperate complete refrigerant charge. Pressurize system with dry nitrogen. If
leakage has been not detected break a vacuum, dehydrate and charge with refrigerant.
Do not reintroduce used refrigerant, send it to an authorized recycling location.
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!
Never use oxygen to pressurize system or purge lines for leak test. Oxygen reacts violently with
oil, which can cause an explosion resulting in damage, personal injury or death.
WARNING!
If it is necessary to make brazing operation, first fill the circuit with dry nitrogen. Burning
refrigerant 410A results in toxic gas emissions.
WARNING!
