Water Control - LG ARWN Serie Manual De Instalación

Water control

Water control
• Keep the water temperature between 10~45°C(50~113°F). Other it may cause the breakdown.
- Standard water supply temperature is 30°C(86°F) for Cooling and 20°C(68°F) for heating.
• Properly control the water velocity. Otherwise it may cause the noise, pipe vibration or pipe contraction, expansion
according to the temperature. Use the same water pipe size connected with the product or more.
• Refer to the water source pipe diameter and water velocity table below. As the water velocity is fast, air bubble will
increase.
Diameter [mm(inch)]
< 50(1-31/32)
50(1-31/32) ~ 100(5-7/8)
100100(5-7/8) <
• Be careful of the water purity control. Otherwise it may cause the breakdown due to water pipe corrosion.
(Refer to 'Standard Table for Water Purity Control')
• In case the water temperature is above 40°C(104°F), it is good to prevent the corrosion by adding the anticorrosive
agent.
• Install the pipe, valve and gauge sensor in the space where it is easy to maintain. Install the water valve in the low
position for drain, if required.
• Be careful not to let air in. If so, the water velocity will be unstable in the circulation, pump efficiency will also
decrease and may cause the piping vibration. Therefore, install the air purge where it may generate the air.
• Choose the following anti freezing methods. Otherwise, it will be dangerous for the pipe to break in the winter.
- Circulate the water with the pump before dropping the temperature.
- Keep the normal temperature by boiler.
- When the cooling tower is not operated for a long time, drain the water in the cooling tower.
- Use an anti-freeze.
- Refer to the additive amount about freezing temperature as in the table given below.
Anti freeze type
Ethylene glycol (%)
Propylene glycol (%)
Methanol (%)
• In addition to anti freeze, it may cause the change of the pressure in the water system and the low performance of
the product.
• Make sure to use the closed cooling type tower.
When applying the open type cooling tower, use a 2
type system.
Velocity range (m/s)
0.6 ~ 1.2
1.2 ~ 2.1
2.1 ~ 2.7
Minimum temperature for anti freezing [°C(°F)]
0 -5(23)
0 12
0 17
0 6
heat exchanger to make the water supply system a closed
nd
-10(14) -15(5)
20 30
25 33
12 16
Installation Manual 13
Installation space
-20(-4) -25
- -
- -
24 30