15
AIR COOLED WATER CHILLERS
– AXIAL FANS
EKWXA/EKWXBA
11.15 207443 Rev104
• If is necessary to add or recuperate refrigerant 410A always do it in LIQUID phase. Supplying refrigerant
in gas or vapor form, by mistake, will result in wrong mixture conditions.
• Due to its high pressure and quick evaporation, refrigerant R410A cannot be kept in liquid phase inside
charge cylinder because bubbles would form, altering the readings.
• The electronic scale is reinforced with a four support-point structure for the weight sensor of the
refrigerant bottle.
• In addition, it can also be used for any type of refrigerant’s charge. The refrigerant’s charge is carried out
opening and closing the valve manually.
• Immediately repair all refrigerant leaks.
• Never overcharge the system.
• Never use compressor as vacuum pump.
• If during operation will appear symptoms of refrigerant loss is necessary to make leak test. Leak
detectors usually employed with CFC and HCFC cannot be used with R410a, due to chlorine in its
composition. A leak detector for R134A may be used but the sensibility will be lower (when sensibility is 1
for R134A, it falls to 0,6 for R410A).
• To find small leaks, you will need a detector for HCF. Sensibility for R410A is approximately 23 grams
per year.
• 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.
Compressors with R410A refrigerant use polyester synthetic oil. Each compressor’s manufacturer
recommends a specific type of oil for its products. The compressor or the system should not be left opened
to atmosphere more than 15 minutes. Synthetic lubricants are used as ester (POE, Polyol Ester) that have
a high solubility with R410A. Since these types of oils are very hygroscopic, more care should be taken
rather than with the conventional ones. Furthermore, when these synthetic oils are mixed with minerals or
alkylbenzene, they deteriorate producing capillary obstruction or failures in the compressor.
Do not mix
them under any circumstance.
COMPRESSOR LUBRICANT
REFRIGERANT CHARGE
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.
If it is necessary to make brazing operation, first fill the circuit with dry nitrogen.
Burning refrigerant 410A results in toxic gas emissions.
ATTENTION!
ATTENTION!
