Stulz CRS 211 A - 6.4 Water Connection (GS, GES, CW Units)

49
/04.2016/G35
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
50%
40%
30%
20%
10%
-10 -8 -6 -4 -2 0 2 4 6 8
CR... 251 GS/GES CR... 361 GS/GES CR... 210 CW CR... 320 CW CR... 560 CW
1" 1 1/4" 1" 1" 1 1/2"
EN
6.4 Water connection (GS, GES, CW units)
CyberRow CW air conditioners must be connected to a circuit with chilled water, including either a chiller or a dry
cooler or a cooling tower. For chilled water circulation, pumps have to be provided. These pumps must be selected
according to total pressure losses in the hydraulic circuit.
Internal pressure losses in water circuits of the air conditioners are shown in the technical data in
chapter 5. Pressure losses refer to pure water. When monoethylene glycol is added, the correction
factor for pressure losses which are shown in the following diagram must be taken into account.
An important requirement for hydraulic circuit is quality of water. In case its purity is inadequate, a fine mesh filter in
the circuit is recommended.
Cooling fluid temperature must be > +5°C.
The following table shows substances which must be added in particular working conditions to
ensure correct functioning:
An excess of additive reduces the performance of the cooling system. In case of doubt consult the
manufacturer.
Maximum admitted quantity of glycol 50%
Maximum total (static + dynamic) pressure in water circuit = 10 bar for every standard CyberRow
type GS, GES, CW.
WORKING CONDITIONS ADDITIVE
Outside temperature < 0 °C Antifreeze containing inhibited monoethylene
glycol (*)
Hydraulic circuit made of multi-metallic systems as
cast iron, steel, copper, brass, Aluminium
Passivating inhibitor of corrosion with neutral
PH
(*) Dose following the prescriptions of antifreeze supplier, according to minimum ambient
and working temperatures.
Coefficient of correction for pressure
drop through the water circuit when
using monoethylene glycol
average temperature of chilled water (°C)
Hydraulic connections in CyberRow units have an external thread, with the following diameters: