18
03.17 207529 Rev.100
CSTIA/CCHIA
– CSTIBA/CCHIBA
SPLIT HORITZONTAL INVERTER UNITS
AUTONOMOUS AIR-AIR
In addition to refrigerant, sometimes it’s necessary to add oil. For more than 25 meters, add 30 grams.
If liquid line is descendant and there is a considerable height difference, you have to compensate the excess pressure
before the expansion.
If liquid line is ascendant and there is a considerable height difference, the formation of gas refrigerant before the
expansion must be avoided.
If you should not find the chosen pipe diameter, you can use the immediately lower diameter. The system will function
normally only with a slight reduction of performance.
Units CSTIA/CCHIA and CSTIBA/CCHIBA are supplied with nitrogen charge at a pressure between 5 and 6 bar.
Before p
roceeding 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.
REFRIGERANT CHARGE
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. Use always a scale to charge the unit with refrigerant.
Repair immediately any refrigerant leak.
Never overcharge the system.
Never use compressor as a vacuum pump.
It is forbidden by law to expel refrigerant into the atmosphere; therefore, it is
necessary to recover all the refrigerant and to avoid leaks.
Units without valves come loaded with nitrogen pressure leak test. Drain with
caution previously the realization of unions.
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.
If it’s necessary to make welding operations, you must fill the circuit with dry
nitrogen. Combustion of R410A refrigerant generates toxic gases.
