JULABO FLW4006 Recirculating Coolers - Manual (Page 14)

14
3.1. Cooling water connection
Only for water cooled models - FLW:
Cooling water pressure (IN / OUT )
max. 6 bar
Difference pressure (IN - OUT ) 2 … 6 bar
Flow rate on FLW250x typical 4,1 l/min
Flow rate on FLW400x typical 6,6 l/min
Cooling water temperature <20 °C
Recommended quality of cooling water:
pH – value 7,5 to 9,0
Sulfate [SO4 2- ] < 100 ppm
Hydrocarbonate [HCO3- ] / Sulphate [SO4 2-] > 1 ppm
Hardness [Ca2+, Mg2+] / [HCO3-]
> 0,5 dH
Alkalinity
60 ppm < [HCO3-] < 300 ppm
Conductivity
< 500 μs / cm
Chloride (CL-)
< 50 ppm
Phosphate (PO43-) < 2 ppm
Ammonia (NH3) < 0,5 ppm
Free Chlorine < 0,5 ppm
Ferri Ions (Fe3+ ) < 0,5 ppm
Mangano Ions (Mn2+) < 0,05 ppm
Carbon dioxide (CO2) < 10 ppm
Hydrosulfide (H2S) < 50 ppm
Content of oxygen < 0,1 ppm
Algae growth impermissible
Suspended solids impermissible
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of cooling
water.
 Due to its high content of lime hart water is not suitable for cooling and causes
calcination of the heat exchanger.
 Ferrous water or water containing ferrous particles will cause formation of rust
even in heat exchangers made of stainless steel.
 Chlorous water will cause pitting corrosion in heat exchangers made of stainless
steel.
 Due to its corrosive characteristics distilled and deionized water is unsuitable and
will cause corrosion of the bath. .
 Due to its corrosive characteristics sea water is not suitable.
 Due to its microbiological (bacteria) components which settle in the heat
exchanger untreated and unpurified river water and water from cooling towers is
unsuitable.
 Avoid particulate matter in cooling water.
 Avoid putrid water.
Notice: Cooling water circuit
Risk of oil leaking from the cooling circuit (compressor) of the recirculating cooler into
the cooling water in case of a fault in the circuit!
Observe the laws and regulations of the water distribution company valid in the location
where the unit is operated.