Cooling Tower Applied Method - LG ARWB200LAS4 Installation Manual

42
In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take
one of the countermeasures shown below:
- Countermeasure 1
Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below
door, or provide opening without door.
- Countermeasure 2
Provide gas leak alarm linked with mechanical ventilator.
Reducing the outside unit refrigerant qty.
Gas leak alarm
Countermeasure 2
Mechanical ventilator
Indoor unit
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
COOLING TOWER APPLIED
METHOD
Open type
cooling tower
1 st side
Heat exchange
[Open type cooling tower + Middle heat exchanger]
Heat exchanger is installed between the cooling tower and outside
unit system piping, and the temperature difference between 1st side
and 2nd side is maintained constantly.
Countermeasure 1 Opening effective to ventilation
2 nd side
Closed type
cooling tower
! CAUTION
When the open type cooling tower is used and the water supply is
directly connected to the 2nd heat exchanger, product damage by
alien particle cannot be repaired for free.
- Always use the 2nd heat exchanger.
WATER SOLENOID VALVE CON-
TROL
Central Control(Use DDC Port)
Water CN_18
Water
(220 V Out)
In
Out
Solenoid
1(L) 2(N) 3(L) 4(N)
Valve
※ BMS : Building Management System
Individual Control(Use 220V Output Port)
CN_18
Water
Water
(220 V Out)
In
Out
Solenoid
1(L) 2(N) 3(L) 4(N)
Valve
※ Refer to setting the function and turn on the power
When you individual control for water solenoid valve
control.
CN_22
Main PCB
(to DDC)
PI 485
BMS
DDC
CN_22
Main PCB
(to DDC)