LG THERMA V Series Installation Manual page 33

To prevent damage to the components of the hydraulic system, we recommend the additional
installation of Micro-bubble venting system.
The micro bubbles in the system forms larger bubbles which eventually can cause corrosion of the
system, result in system component malfunction and operation disturbance.
The table below represents the maximal allowed content of individual substances in the heating
water and the influence of these on the heat exchanger. Do not use the heating water that contains
any substance in concentrations ;resulting in corrosion of the heating system (influence "-"). Do not
use heating water that contains two or more substances in concentrations ;resulting in corrosion in
the heating system (influence "0").
TYPE OF PRESENT
SUBSTANCE
'Organic sediment
Ammonia NH
3
Chloride
Allowed water hardness
Electrical conductivity
Iron (Fe) removed
Free carbonic acid
Manganese (Mn) removed
Nitrates (NO ) removed
3
pH value
Oxygen
Hydrogen sulphide (H S)
2
2
HCO3- / SO -
4
Hydrogen carbonate
Aluminium (Al) removed
Sulphates
Sulphite (SO )
3
Chlorine (gas) (Cl )
2
Table: Influence of various aggressive substances in the heating water based up on the stability of
stainless copper welded plate transmitters. (+ = no influence, 0 = danger of corrosion, - = corrosion -
use not permitted).
The heating system has to be filled with water with the hardness scale between 5 °dH and 10 °dH.
Malfunctions of the device caused by water hardness is not covered by the warranty.
UNIT CONCENTRATION
mg / L
mg / L 1 to 20
< 300
mg / L
> 300
°dH 5 – 10
µS / cm 10 to 500
> 500
mg / L
mg / L 5 to 20
mg / L
< 100
mg / L
> 100
mg / L 7.5 to 9
mg / L
< 0.05
mg / L
> 0.05
mg / L
mg / L 70 to 300
> 300
mg / L
mg / L 70 to 300
> 300
mg / L
mg / L 1 to 5
Installation of Indoor Unit
INFLUENCE TO THE HEAT
< 2
> 20
< 10
< 0.2
> 0.2
< 5
> 20
< 0.1
> 0.1
< 7.5
> 9
< 2
> 2
> 1
< 1
< 70
< 0.2
> 0.2
< 70
< 1
< 1
> 5
Installation Manual 33
CONDUCTOR
0
+
0
-
+
0
0
+
-
+
0
+
0
-
+
0
+
0
0
+
0
+
0
+
-
+
0
0
+
0
+
0
+
0
-
+
+
0
-