Refrigerant Charge - Hitecsa ACHIA 601 Installation, Operation And Maintenance Manual

ACHIA / ACHIBA
AIR-TO-AIR UNITS – COMPACT HORITZONTAL INVERTER

REFRIGERANT CHARGE

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
• 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.
If it's necessary to make welding operations, you must fill the circuit with dry
nitrogen. Combustion of R410A refrigerant generates toxic gases.
21
• Repair immediately any refrigerant leak.
• Never overcharge the system.
• Never use compressor as a vacuum pump.
• 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.
• 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.
injuries or even death.
15
11.14 207434 Rev.103