LG ARUN038GS2 Installation Manual page 35

Special condition
In case of the No. of CST TQ/RAC SE/ARTCOOL SF models are over than 50% of the connected
indoor units when the total No. of connected indoor units are over than 50% of the max. connectable
indoor units.
=
Total amount(kg(lb))
Additional refrigerant charging amount (kg) :
= (A x + B x ß) - (AVG x ß)
• A = Total No. of TQ,SE and SF Indoor units,
• B = Total No. of except TQ,SE and SF Indoor units,
• AVG = 50% of Max. No. of connectable Indoor units.
Example)
1) Installation Information
- Outdoor unit : 6HP
- Total indoor units : 6 units (TQ 3 units, SE 2 units, BH 1 unit)
2) Information from PDB
- Max. No. of connectable indoor units : 10 units
- Calculated additional refrigerant amount = 2 kg(0.91 lb) :
3) Indoor refrigerant charging amount
= (5 units x 0.5+1 unit x 0.3) - (5 units x 0.3) = 1.3 kg(0.59 lb) :
Revised the total additional charging amount =
WARNING
Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which indoor unit of the least capacity is installed
If the above equation can not be satisfied, then follow the following steps.
- Selection of air conditioning system: select one of the next
1. Installation of effective opening part
2. Reconfirmation of outdoor unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)
- Change indoor unit type
: installation position should be over 2m(6.6ft) from the floor (wall mounted type
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: Prepare for earthquake and thermal stress
WARNING
Refer to model information since the CF value of correction factor differs depending on model.
+ +
A B C
Refrigerant piping installation
= 0.5
ß = 0.3
= 2 kg(0.91 lb) +1.3 kg(0.59 lb)
= 3.3 kg(1.50 lb)
0.44kg / m
Installation Manual 35
3 (0.028(lbs/ft 3 .))
cassette type)