Daikin EWAQ~G-SS - Water Treatment and Anti-freeze; Water Treatment Guidelines; Water Flow and Volume

D-EIMAC01207-15EN - 11/22
1 2 3 4 5 6 7
1 Evaporator water inlet
2 Flow Switch
3 Water inlet sensor
4 Water inlet pipe with flow switch and water
inlet temperature sensor
5 Joint
6 Counter-pipe
7 In situ water pipe circuit
8 Filter
9 Filter and cup
The water in the system must be particularly clean and
all traces of oil and rust must be removed. Fit a
mechanical filter at the entry of every heat exchanger.
Failure to install a mechanical filter can allow solid
particles and/or welding burrs to get inside the
exchanger. We recommend installing a filter with a
filtering mesh with holes not larger than 1.1mm in
diameter.
The manufacturer cannot be held responsible for any
damage to the exchangers if the mechanical filters are
not installed.
Water treatment
Before putting the unit into operation, clean the water
circuit. Dirt, scale, debris and other material can
accumulate inside the heat exchanger and reduce both
its heat exchanging capacity and the flow of the water.
Correct water treatment can reduce the risk of
corrosion, erosion, scale formation, etc. The most
suitable treatment must be selected depending on the
place of installation, considering the water system and
the characteristics of the water.
The manufacturer is not responsible for any damage or
malfunctions of the equipment.
The quality of the water must comply with the
specifications listed in the following table.
The water pressure must not exceed the
maximum operating pressure for the unit.
NOTE - Include adequate protection systems in the
water circuit to make sure that the pressure of the water
never exceeds the maximum limit allowed.
Water flow and volume
G EWAQ~G SS
model
Minimum water
flow
l/s
Maximum
water flow
l/s
EWAQ075G-SS
2.16
4.32
EWAQ085G-SS
2.40
4.80
EWAQ100G-SS
2.76
5.52
EWAQ110G-SS
3.06
6.12
EWAQ120G-SS
3.36
6.72
EWAQ140G-SS
4.02
8.04
EWAQ155G-SS
4.44
8.88
Circulati
ng water
Water
supply
Possible
problems
Items to be checked
pH at 25°C
6.8~8.0
6.8~8.0
Corrosion
+ limescale
Electrical
conductivity
[mS/m] at 25°C
<40
<30
Corrosion
+ limescale
Chloride ions
[mg Cl˜/l]
<50
<50
Corrosion
Sulphate ions
[mg SO4²˜/l]
<50
<50
Corrosion
Alkalinity M
(pH4.8)
[mg CaCO3/l]
<50
<50
Limescale
Total hardness
[mg CaCO3/l]
<70
<70
Limescale
Calcium
hardness
[mg CaCO3/l]
<50
<50
Limescale
Silicon ions
[mg SiO2/l]
<30
<30
Limescale
Elements of reference
Iron
[mg Fe/l]
<1.0
<0.3
Corrosion
+
limescale
Copper
[mg Cu/l]
<1.0
<0.1
Corrosion
Sulphur ions
[mg S²˜/l]
Not
detectabl
e
Not
detectabl
e
Corrosion
Ammonium ions
[mg NH4+/l]
<1.0
<0.1
Corrosion
Remaining
Chloride
[mg Cl/l]
<0.3
<0.3
Corrosion
Free Carbide
[mg CO2/l]
<4.0
<4.0
Corrosion
Index of stability
-
-
Corrosion
+ limescale
8 8
9