4. Water Control

5 _ Air-to-Water Heat Pump

Part 2. Desing and installation

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.

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.

Parameter Value

Acrylamide 0.10 μg/l

Antimony 5.0 μg/l

Arsenic 10 μg/l

Benzene 1.0 μg/l

Benzo(a)pyrene 0.010 μg/l

Boron 1.0 mg/l

Bromate 10 μg/l

Cadmium 5.0 μg/l

Chromium 50 μg/l

Copper 2.0 mg/l

Cyanide 50 μg/l

1.2-dichloroethane 3.0 μg/l

Epichlorohydrin 0.10 μg/l

Parameter Value

Fluoride 1.5 mg/l

Lead 10 μg/l

Mercury 1.0 μg/l

Nickel 20 μg/l

Nitrate 50 mg/l

Nitrite 0.50 mg/l

Pesticides 0.10 μg/l

Pesticides — Total 0.50 μg/l

Polycyclic aromatic hydrocarbons 0.10 μg/l

Selenium 10 μg/l

Tetrachloroethene and Trichloroethene 10 μg/l

Trihalomethanes — Total 100 μg/l

Vinyl chloride 0.50 μg/l

• 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.

• 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.

Antifreeze type

Antifreeze mixing ratio

0°C -5°C -10°C -15°C -20°C -25°C

Ethylene glycol 0% 12% 20% 30% - -

Propylene glycol 0% 17% 25% 33% - -

Methanol 0% 6% 12% 16% 24% 30%

Brand	LG
Model	HM031M
Category	Heat Pump
Language	English

LG HM031M User Manual

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LG HM031M Specifications

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