Water Quality; Frost Protection - LG THERMA V Installation Manual

PIPING AND WIRING FOR INDOOR UNIT
94

Water Quality

Water quality should be complied with EN 98/83 EC Directives.
Detailed water quality condition can be found in EN 98/83 EC Directives.
CAUTION
!
• If the product 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.
• It is strongly recommended to install an additional filter on the heating water circuit.
Especially to remove metallic particles from the heating piping, it is advised to use a
magnetic or cyclone filter, which can remove small particles. Small particles may damage
the unit and will NOT be removed by the standard filter of the heat pump system.

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 liters to this total volume to allow for the water contained in
AWHP unit.
Antifreeze type
Ethylene glycol
Propylene glycol
Methanol
If you use frost protection function, change DIP switch setting and input the temperature
condition in Installation mode of remote controller. Refer to page 109 and 161.
CAUTION
!
• 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 mixing ratio
0 °C -5 °C -10 °C
0 % 12 % 20 %
0 % 17 % 25 %
0 % 6 % 12 %
-15 °C -20 °C -25 °C
30 % -
33 % -
16 % 24 % 30 %
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