26
CG-SVX01C-E4
General start-up
When ethylene glycol is added in the chilled water circuit the following
adjustment factors have to be taken in account.
Table 13 - Ethylene glycol adjustment factors
LWTE
PCT EG
Adjustment factors
(%)
Flow rate
Pressure drop
Power Input
Cooling Cap.
12
30
1.11
1.20
1.005
0.98
5
30
1.11
1.24
1.005
0.98
4
10
1.02
1.08
-
-
0
20
1.05
1.19
-
-
-4
27
1.08
1.29
-
-
-8
33
1.10
1.46
-
-
-12
37
1.12
1.62
-
-
0%
5%
10%
15%
20%
25%
30%
35%
40%
-12 °C
-10 °C
-8 °C
-6 °C
-4 °C
-2 °C
0 °C
2 °C
4 °C
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
-10 °C
-8 °C
-6 °C
-4 °C
-2 °C
0 °C
2 °C
4 °C
A relief valve is located at pump
suction limiting water circuit
pressure at 3 bar.
Nitrogen pressure inside of the
expansion tank must be equal to the
geometric height of the installation
+ 0.5 bar (in order to avoid air
entering in the water circuit)
Expansion tank must be inflated
with nitrogen. Pressure must be
checked yearly.
For a good pump operation, pump
suction pressure must be between
0.5 and 2.5 bar when pump runs.
Ethylene Glycol recommended concentration
Propylene Glycol recommended concentration
Lowest water temperature
Lowest water temperature
