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MULTI V Water IV
4. Water Control
4.1 Water control
•
Keep the water temperature between 10~45°C. Other it may cause the breakdown.
– Standard water supply temperature is 30°C for Cooling and 20°C 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.
•
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, 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(For using an anti freeze, change the DIP switch on main PCB in outside unit.)
– 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 middle heat exchanger to make the water supply system a
closed type system.
6
Heat Pump
Diameter (mm)
< 50
50 ~ 100
100 <
Minimum temperature for anti freezing (°C)
0
0
12
0
17
0
-5
-10
20
25
6
12
Installation of Outside Units
Velocity range (m/s)
0.6 ~ 1.2
1.2 ~ 2.1
2.1 ~ 2.7
-15
-20
30
-
33
-
16
24
-25
-
-
30
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