CCHA/ECHA – CCHBA/ECHBA
Installation, operation and maintenance instructions
22
REFRIGERANT CHARGE
WARNING!!!
It is forbidden by law to expel refrigerant into the atmosphere; therefore, it is necessary to
recover all the refrigerant and to avoid leaks.
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Units CCHA-CCHBA y ECHA-ECHBA are supplied with nitrogen charge. Before proceeding to
any welding work, it’s necessary to remove this charge out of the interconnection lines.
Once you have finished, make the vacuum and charge with the right amount of refrigerant.
WARNING!!!
Never use oxygen to carry out leak tests. Oxygen reacts violently when in contact with oil and
could cause an explosion resulting in damage, personal injuries or even death.
•
Should it be necessary to add or recover refrigerant, do it always in LIQUID phase, never in gas
or vapour phase since this would cause wrong mixing conditions.
•
Due to its high pressure and quick evaporation, refrigerant R410A cannot be kept in liquid
phase inside charge cylinder because bubbles would form, making reading difficult.
WARNING!!!
If it’s necessary to make welding operations, you must fill the circuit with dry nitrogen.
Combustion of R410a refrigerant generates toxic gases.
•
Repair immediately any refrigerant leak.
•
Never overcharge the system.
•
Never use compressor as a vacuum pump.
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If symptoms of refrigerant loss appear during operation, it’s necessary to carry out a 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 approx. 23 grams
per year.
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If a gas leak is found, it will be necessary to remove and completely recover the refrigerant
charge. Pressurize the system with dry nitrogen. If no leakage is detected, then do the vacuum
and charge again with refrigerant.
