LG ACHH017VBAB Installation And Owner's Manual page 113

HEAT SOURCE WATER MANAGEMENT
Heat source water management
- Maintain the supplied heat source water temperature in the boundary of 10 °C ~ 45 °C.
Otherwise, it may cause product failure.
- The flow speed of the supplied heat source water shall be adjusted adequately.
Otherwise, it may cause abnormal noise, pipe vibration, or pipe contraction or expansion by
temperature. Use the heat source water pipe with the size of the same diameter of the product
connection or bigger.
- Refer to the following table for the heat source water pipe gauge and flow speed.
As the flow speed is faster, the noise, corrosion, and inflow of air bubbles increase.
Diameter (mm)
< 50
50 - 100
100 <
- Caution is required for water quality management. Otherwise, it may cause heat source water pipe
corrosion and product failure.
- If the water temperature is 40 °C or higher, corrosion may occur, so it is better to add anti-corrosion
solution.
- Install the pipe, valve, gauge, and sensor where the maintenance is easy. Install the heat source
water pipe valve at a low position for draining when it is necessary.
- Be careful not to have inflow of air. Air makes the flow speed unstable during the circulation of the
heat source water and may degrade pump efficiency and generate heat source water pipe vibration.
Therefore, install air purge at appropriate places where air generations are expected.
- Use the following methods to prevent freezing. Otherwise, there is a risk of freezing in the winter.
* When the temperature drops, before the freezing, circulate the water with pump.
* Operate boiler to maintain room temperature.
* If it is not operated for a long period of time in the winter, drain the cooling tower water.
* Use freezing prevention solution.
* Refer to the following table for minimum addition amount of freezing prevention solution for each
freezing temperature.
Types of freezing
prevention solution
Ethylene glycol (%)
Propylene glycol (%)
Methanol (%)
* If freezing prevention solution is added, it may cause increased heat source water system pressure
drop or product performance degradation.
Note:
• Sealed type cooling tower is recommended.
- If open type cooling tower is applied, use middle heat exchanger to make the heat source
water supply system to be sealed type.
- If middle heat exchanger is not used and open type cooling tower is directly connected to the
product, product may be severely damaged by foreign object, etc., and in such case, free repair
will not be possible.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
WATER SYSTEM MAINTENANCE
Speed Boundary (m/s)
0.6 – 1.2
1.2 – 2.1
2.1 – 2.7
Minimum temperature (°C) to prevent freezing
0 -5 -10
0 12 20
0 17 25
0 6 12
-15 -20 -25
30 - -
33 - -
16 24 30
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