LG Multi V PRHR023 - Cooling Tower Applied Method; Water Solenoid Valve Control

56
ENGLISH
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 outdoor unit refrigerant qty.
[Open type cooling tower + Middle heat exchanger]
Heat exchanger is installed between the cooling tower and outdoor
unit system piping, and the temperature difference between 1st side
and 2nd side is maintained constantly.
Countermeasure 2
Gas leak alarm
Mechanical ventilator
Countermeasure 1
Opening effective to ventilation
Indoor unit
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
Central Control(Use DDC Port)
Individual Control (Use 220 V Output Port)
Water
In
※ BMS : Building Management System
Water
Out
Solenoid
Valve
CN_18
(220 V Out)
CN_22
(to DDC)
PI 485
DDC
BMS
1(L) 2(N) 3(L) 4(N)
Main PCB
Water
In
Water
Out
Solenoid
Valve
※ Refer to setting the function and turn on the power
When you individual control for water solenoid valve
control.
CN_18
(220 V Out)
CN_22
(to DDC)
1(L) 2(N) 3(L) 4(N)
Main PCB
Open type
cooling tower
1
st
side
2
nd
side
Heat exchange
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
CONTROL
COOLING TOWER APPLIED
METHOD