Water Analysis - Lennox eCOMFORT R32 GAC 035S Installation, Operating And Maintenance Manual

3.- COMMISSIONING AND OPERATION

3.5.- WATER ANALYSIS

The water must be analysed; the water circuit installed must include all items necessary for treaent of the water: filters, additives,
intermediate exchangers, bleed valves, vents, isolating valves etc... depending on the results of the water analysis.
We do not advise operation of the units with open loops which can cause problems with oxygenation, or operation with
untreated ground water.
Use of untreated or improperly treated water can cause deposits of scale, algae and sludge or cause corrosion and erosion. It is
advisable to call in a qualified water treaent specialist to determine what kind of treaent will be necessary. The manufacturer cannot
accept liability for damage caused by the use of untreated or improperly treated water, salt water or brine.
Here are our non exhaustive recommendations given as an indication:
•
No NH4+ ammonium ions in the water, they are very detrimental for copper. <10mg/l
•
Cl- Chloride ions are detrimental for copper with a risk of perforations by corrosion by puncture. < 10 mg/l.
•
SO42- sulphate ions can cause perforating corrosion.< 30 mg/l.
•
No fluoride ions (<0.1 mg/l).
•
No Fe2+ and Fe3+ ions with dissolved oxygen. Dissolved iron < 5 mg/l with dissolved oxygen < 5 mg/l. Over those values, it
means a corrosion of steel which may generate a corrosion of copper parts under deposite of Fe – this is mainly the case with
shell and tube heat exchangers.
•
Dissolved silicon: silicon is an acid element of water and can also lead to corrosion risks. Content < 1mg/l.
•
Water hardness: TH >2.8 K. Values between 10 and 25 can be recommended. This will facilitate scale deposit that can limit
corrosion of copper. TH values that are too high can cause piping blockage over time.
•
TAC< 100.
•
Dissolved oxygen: Any sudden change in water oxygenation conditions must be avoided. It is as detrimental to deoxygenate the
water by mixing it with inert gas as it is to over-oxygenate it by mixing it with pure oxygen. The disturbance of the oxygenation
conditions encourages destabilisation of copper hydroxides and enlargement of particles.
•
Specific resistance – electric conductivity: the higher the specific resistance, the slower the corrosion tendency. Values above
3000 Ohm/cm are desirable. A neutral environment favours maximum specific resistance values. For electric conductivity values
in the order of 200-6000 S/cm can be recommended.
•
pH: pH neutral at 20°C (7 < pH < 8)
Installation manual / eCOMFORT R32-MIL166E-0222 - 09/2022 • 73 •