Water Quality; Frost Protection - LG HM031M Engineering Product Data Book

4. Water Control

4.2 Water quality

Water quality should be complied with EN 98/83 EC Directives. Requirement for resolved chemical ingredients is following
table. Detailed water quality condition can be found in EN 98/83 EC Directives.
Parameter
Acrylamide
Antimony
Arsenic
Benzene
Benzo(a)pyrene
Boron
Bromate
Cadmium
Chromium
Copper
Cyanide
1.2-dichloroethane
Epichlorohydrin
• If the unit is installed at existing hydraulic water loop, it is important to clean hydraulic pipes to remove sludge and scale.
• Installing sludge strainer in the water loop is very important to prevent performance degrade.
• Chemical treatment to prevent rust should be performed by installer.

4.3 Frost protection

In areas of the country where entering water temperatures drop below 0 °C, the water pipe must be protected by using an
approved antifreeze solution. Consult your AWHP unit supplier for locally approved solutions in your area. Calculate the
approximate volume of water in the system. (Except the AWHP unit.) And add six litters to this total volume to allow for the
water contained in AWHP unit.
Antifreeze type
Ethylene glycol
Propylene glycol
Methanol
• Use only one of the above antifreeze.
• If a antifreeze is used, pressure drop and capability degradation of the system can be occurred.
• If one of antifreezes is used, corrosion can be occurred. So please add corrosion inhibitor.
• Please check the concentration of the antifreeze periodically to keep same concentration.
• When the antifreeze is used (for installation or operation), take care to ensure that antifreeze must not be touched.
• Ensure to respect all laws and norms of your country about Anti-freeze usage.
5 _
Air-to-Water Heat Pump
Value Parameter
0.10 μg/ Fluoride
5.0 μg/ Lead
10 μg/ Mercury
1.0 μg/ Nickel
0.010 μg/ Nitrate
1.0 mg/ Nitrite
10 μg/ Pesticides
5.0 μg/ Pesticides — Total
50 μg/ Polycyclic aromatic hydrocarbons
2.0 mg/ Selenium
50 μg/ Tetrachloroethene and Trichloroethene
3.0 μg/ Trihalomethanes — Total
0.10 μg/ Vinyl chloride
Antifreeze mixing ratio
0°C -5°C -10°C
0% 12%
0% 17%
0% 6%
-15°C
20% 30%
25% 33%
12% 16%
Value
1.5 mg/
10 μg/
1.0 μg/
20 μg/
50 mg/
0.50 mg/
0.10 μg/
0.50 μg/
0.10 μg/
10 μg/
10 μg/
100 μg/
0.50 μg/
-20°C -25°C
- -
- -
24% 30%