EWYQ080~250DAYN
Packaged air-cooled water chillers
4PW35559-1D – 03.2011
Installation manual
5
Water quality specifications
The water quality must be in accordance with the specifications listed
in the table below.
Charging water
For all models
1
Connect the water supply to the drain and fill valve
2
Open the pressure regulating valve and shut-off valves (only for
models with option OPSP, OPTP or OPHP)
3
Use the air purge valves on the unit and purge valves installed in
the highest places in the circuit to remove all air when filling the
system
Only for models with option OPSP, OPTP or OPHP
Water must be filled until the system reaches the required pressure
(Pr). The pressure can be read on the manometer.
The value of the required water pressure (Pr) is depending on the
total water volume in the system and the pressure in the expansion
vessel (see previous chapter).
Refer to the figure – Required water pressure in function of water
volume and pre-pressure (Pg):
1.
Calculate the total water volume in the entire system corresponding
with the expansion vessel.
2.
Check in the figure above where the horizontal line of the set
pre-pressure (Pg) cuts the vertical line of the system water
volume.
3.
At the cutting point, read the required water pressure (Pr) from the
lines in the figure.
circulating
water
supply
water
tendency if
out of criteria
Items to be controlled
pH
at 25°C
6.8~8.0
6.8~8.0
co
scale
Electrical conductivity
[mS/m]
at 25°C
<40
<30
co
scale
Chloride ion
[mg Cl
–
/l]
<50
<50
corrosion
Sulphate ion
[mg SO
4
2–
/l]
<50
<50
corrosion
M-alkalinity (pH4.8)
[mg CaCO
3
/l]
<50
<50
scale
Total hardness
[mg CaCO
3
/l]
<70
<70
scale
Calcium hardness
[mg CaCO
3
/l]
<50
<50
scale
Silica ion
[mg SiO
2
/l]
<30
<30
scale
Items to be referred to
Iron
[mg Fe/l]
<1.0
<0.3
co
scale
Copper
[mg Cu/l]
<1.0
<0.1
corrosion
Sulphide ion
[mg S
2–
/l]
not
detectable
not
detectable
corrosion
Ammonium ion
[mg NH
4
+
/l]
<1.0
<0.1
corrosion
Remaining chloride
[mg Cl/l]
<0.3
<0.3
corrosion
Free carbide
[mg CO
2
/l]
<4.0
<4.0
corrosion
Stability index
—
—
co
scale
The chillers are only to be used in a closed water system.
Application in an open water circuit can lead to excessive
corrosion of the water piping.
NOTE
Provide adequate safeguards in the water circuit to
make sure that the water pressure will never exceed
the maximum allowable working pressure.
For models with option OPSP, OPTP or OPHP, also
refer to
"Setting the pre-pressure of the expansion
vessel" on page 4
.
If the water system is drained during some period, rinse
out the pump chamber with demineralised water. This to
prevent the impeller from being blocked by dried impurities.
To do this, use the drain tap of the pump. Fill and empty the
pump a few times until the removed water is completely
clear. Keep the connections closed to prevent corrosion
and dirt entering the water system.
Use of glycol is allowed, but the amount should not exceed
40% of the volume. A higher amount of glycol may cause
damage to the hydraulic components.
2 3
4
1
1
Water out
2
Impeller
3
Water in
4
Drain tap
A
Water volume (l)
B
Installation height difference (m)
C
Pre-pressure (Pg)
D
Pre-pressure factory setting (1.5 bar)
A
(l)
D
(1.5 bar)
150
200 300 400 500
900
600 700 800
1300
1200
1000 1100
1500
1400
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
EWYQ080~210
35 l
Pr=1.0
Pr=1.2
Pr=1.3
Pr=1.4
Pr=1.5
Pr=1.6
Pr=1.7
Pr=1.8
Pr=1.9
Pr=2.0
Pr=2.1
Pr=2.2
Pr=2.4
Pr=2.3
Pr=1.1
B
(m)
C
(bar)
150
200 300 400 500
900
600 700 800
1300
1200
1000 1100
1500
1400
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
250
50 l
Pr=1.0
Pr=1.1
Pr=1.2
Pr=1.3
Pr=1.4
Pr=1.5
Pr=1.6
Pr=1.7
Pr=1.8
Pr=1.9
Pr=2.0
Pr=2.1
Pr=2.2
Pr=2.3
Pr=2.4
D
(1.5 bar)
A
(l)
B
(m)
C
(bar)
Pr=2.5
