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Table 16– Free cooling application coolant quality requirements for MCH coils
Coolant quality requirements
Value
Ph (25 °C)
7.5 ÷ 8.5
Ammonium ion [mg NH
4+
/ l]
< 2
Chloride ion [mg Cl
-
/ l] (water temp. < 65°C)
< 10
Sulphate ions [mg SO
4
2-
/ l]
< 30
Fluoride ions [mg F
-
/ l]
< 0.1
Fe2+ and Fe3+ ions (if dissolved oxygen present >5mg/l) [mg
/ l]
0
Fe2+ and Fe3+ ions (if dissolved oxygen present <5mg/l) [mg / l]
< 5
Zn ions (ethylene glycol solution application)
0
Silica [mg SiO
2
/ l]
< 1
Total Hardness [mg CaCO
3
/ l]
100 ÷ 250
Total alkalimetric title (TAC) [mg / l]
< 100
Electrical conductivity [µS/cm] (25 °C)
200 ÷ 600
Specific resistance [Ohm / m]
> 30
Notes:
- Dissolved oxygen: any sudden change in water oxygenation conditions is not expected.
- The addition of corrosion inhibitor is necessary for ensured coil protection, e.g. those based on monopropylene
glycol or sodium molybdate.
- Maximum opening for strainer mesh shall be 1mm.
The most appropriate water treatment must be determined locally, according to the type of system and water
characteristics.
The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water
or by improperly treated water.
5.1.3 First operations at unit commissioning start
Free cooling section is pressurized before shipping up to 2 bar of dry air To do so, it is necessary to disable free cooling
by PLC and close manually the valve ”d” (see. Fig. 28); valve ”1” will close automatically when disabling free cooling.
When commissioning the unit, it is necessary to:
- Open valve ”d”
- Enable free cooling operation from PLC For glycol free units, it is necessary to set the following parameters on
PLC:
o Pump nominal frequency
o Evaporator nominal flow rate
o Evaporator nominal pressure drop
All the parameters should refer to the Customer working point and can be calculated on Customer Selection
Software, Refer to the OM for further details.
- After coolant (water + glycole) charge operation, it is necessary to vent the unit. Use venting valve installed on
top of MCH coil to do this operation.
Glycol content for each unit is reported in the following table:
Please, note that closed loop free cooling units are shipped without glycol content. Glycol charging
operations must be done on site using valve indicated with „c” in the P&ID. Glycol content for each
unit can be found in Table 17.
Use only pre-made mixtures. The manufacturer cannot be considered responsible if a water-glycol
mixture is created on site.
The expansion tank installed on the unit is pre-charged to 1.5 barg. If necessary, it's possible to
charge the expansion tank with nitrogen using the valve on the top.
When the units is shipped, perform a visual inspection of the expansion vessel focusing on the
connection part between the metal support and the vessel itself.
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Productinformatie
| Merk | Daikin |
| Model | EWFD495TZSSD1 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11779 MB |
