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rev 09.2017 - ©STULZ S.p.A. - all rights reserved
2.4 OPERATIONS
In this unit its possible to use tap water which respects the values reported in the table below.
We recommend the use of premixed fluid COSMOTEC No frost N25 / N39 or COSMOTEC No frost L38.
Alternatively its possible to use Clariant Antifrogen N or Clariant Antifrogen L, respecting the concentrations
recommended in the data sheet of the product.
Check the manual Part II° for any changes.
Using other mixtures could invalidate the chiller warranty.
WATER QUALITIY TABLE
Minimum value
Maximum value
pH
*
7
8
total hardness
*
°F
13
35
conductivity
*
µS/cm
200
350
alkalinity (HCO
3
)
*
mg/L
200
300
* Considering water at tempe20°C
WARNING for water coming out from the unit with temperature equal to or less than +5°C and in
environments where the temperature is below 0°C, using water/glycol mixtures
WARNING lack of glycol in the system: If the unit is not used during the winter it can cause the
freezing of water present in the system
IMPORTANT: Mixing water with glycol modifies the performance of the unit
The chiller cannot be used beyond the limits indicated in the nameplate.
NOTE FOR OIL CHILLERS
For ORA and ORW, use mineral oil-based hydraulic fluids based on the prevailing regulations with a
viscosity of 22-68 mm²/s (cSt), using a filter with a filtering grade of 25
μm.
Summary of Contents for OR Series
Page 1: ...EN rev 09 2017...
