Installation
Installation Manual 31
ENGLISH
WARNING
•
If the primary charging is not performed after vacuum, wet air may go into the outdoor unit. If air is
mixed with the refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.
• Charging of refrigerant while the compressor is working is prohibited. Otherwise, liquid
may go into the compressor. It may cause faults of the compressor.
• Use a gravimeter accurate to 0.1kg.
• If other refrigerants are mixed in the original refrigerant, a refrigerant cycle may cause
malfunction or damage.
• Add accurate refrigerant quantity via calculation.
Too much or too little refrigerant may cause problems
•
Repeated on and off of the indoor units without charging refrigerant may cause faults of EEV.
• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged
in its liquid state. If the refrigerant is charged in its gaseous state, its composition
changes and the system will not work properly.
2. Vacuum
Vacuum drying should be made from the service port provided on the outdoor unit’s service
valve to the vacuum pump commonly used for liquid pipe, gas pipe. Vaccum of the pipe and the
indoor units should be made from the port of the outdoor unit's service valve with the service
valve closed.
* Never perform air purging using refrigerant.
• Vacuum drying: Use a vacuum pump that can evacuate to -100.7kPa (5 Torr, -755mmHg).
1) Evacuate the system from the liquid and gas pipes with a vacuum pump for over 2 hrs and
bring the system to -100.7kPa. After maintaining system under that condition for over 1 hr,
confirm the vacuum gauge rises. The system may contain moisture or leak.
2) Following should be executed if there is a possibility of moisture remaining inside the pipe.
(Rainwater may enter the pipe during work in the rainy season or over a long period of time)
After evacuating the system for 2 hrs, give pressure to the system to 0.05MPa(vacuum break)
with nitrogen gas and then evacuate it again with the vacuum pump for 1hr to -100.7kPa(vac-
uum drying). If the system cannot be evacuated to -100.7kPa within 2 hrs, repeat the steps of
vacuum break and its drying. Finally, check if the vacuum gauge does not rise or not, after
maintaining the system in vacuum for 1 hr.
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