3
5
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 outside unit refrigerant qty.
[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 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.
WATER SOLENOID VALVE CON-
TROL
COOLING TOWER APPLIED
METHOD
Central Control(Use DDC Port)
Individual Control(Use 220V 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.
!
Summary of Contents for Multi V ARWN Series
Page 37: ......
