Water Flow Rate At The Heat Exchangers; Water Composition - Daikin UATYA-BBY1 Installation, Use And Maintenance Manual

2.2.3

Water flow rate at the heat exchangers

It is necessary to ensure that the water flow rate during operation is no higher than 1.5 times and no lower than 0.5
times the nominal flow rate of the unit stated in the Technical Catalogue.
In any case, refer to the specific Technical Catalogue for the allowed conditions for water flow in and
out of the exchangers.
2.2.4

Water composition

Dissolved substances in the water can cause corrosion in the heat exchangers.
It is mandatory to make sure the parameters of the water comply with the following table:
Description
Total hardness
Langelier index
pH
Electrical conductivity
Organic elements
Hydrogen carbonate (HCO3-)
Sulphates (SO42-)
Hydrogen carbonate / Sulphates (HCO3-/SO42-)
Chlorides (Cl-)
Nitrates (NO3-)
Hydrogen sulphide (H2S)
Ammonia (NH3)
Sulphites (SO3), free chlorine (Cl2)
Carbon dioxide (CO2)
Metal cations
Manganese ions (Mn++)
Iron ions (Fe2+, Fe3+)
Iron + Manganese
Phosphates (PO43-)
Oxygen
ppm = mg/l
The use of water with values above the limits stated in the table will immediately void the warranty.
It is mandatory to include a system for eliminating possible organic substances in the water that could pass through
the filter and settle in the heat exchangers, which would lead to malfunctioning and/or breakage over time.
The use of water containing organic substances will immediately void the warranty.
We reserve the right to make changes without any prior notice.
UATYA
4P645202-1
Values
2,0 ÷ 6,0 °f
- 0,4 ÷ 0,4
7,5 ÷ 8,5
10÷500 µS/cm
-
70 ÷ 300 ppm
< 50 ppm
> 1
< 50 ppm
< 50 ppm
< 0,05 ppm
< 0,05 ppm
< 1 ppm
< 5 ppm
< 0,2 ppm
< 0,2 ppm
< 0,2 ppm
< 0,4 ppm
< 2 ppm
< 0,1 ppm
Translation from original instructions
Packaged Rooftop
15