Pre-Installation - Lennox AQUALEAN AWC Application Manual

INSTALLATION
2.1.- PRE - INSTALLATION
Prior to install the equipment, make sure of the following points:
• Leave enough space for access to air supply, water section, power supply and condensed outlet.
• The water section must have the correspondent valves.
• Easy extraction of the air fi lter.
• Easy access to lateral panel for easy accessibility to all services of the unit.
• Unit must be mounted with antivibration.
• The electrical section must be done following legal normative
• Check that the tension is the same as installation place.
• Keep in mind power supply for maximum consumption for each unit.
• Check water quality, across analysis according to local normative. If quality of water is not good, it may be neces-
sary to install a device to decalcify.
• The water must be analysed; the water circuit installed must include all items necessary for treatment of the water:
fi lters, 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 qualifi ed water treatment specialist to determine what kind of treatment 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
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Cl- Chloride ions are detrimental for copper with a risk of perforations by corrosion by puncture. < 10 mg/l.
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SO42- sulphate ions can cause perforating corrosion.< 30 mg/l.
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No fl uoride ions (<0.1 mg/l).
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No Fe2+ and Fe3+ ions with dissolved oxygen. Dissolved iron < 5 mg/l with dissolved oxygen < 5 mg/l. Over
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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.
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Water hardness: TH >2.8 K. Values between 10 and 25 can be recommended. This will facilitate scale deposit
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that can limit corrosion of copper. TH values that are too high can cause piping blockage over time.
TAC< 100.
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Dissolved oxygen: Any sudden change in water oxygenation conditions must be avoided. It is as detrimental to
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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.
Specifi c resistance – electric conductivity: the higher the specifi c resistance, the slower the corrosion tendency.
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Values above 3000 Ohm/cm are desirable. A neutral environment favours maximum specifi c 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)
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It is very important that the unit works with water fl ows between maximum and minimum values according to the tables. You
have to calculate water pump and install regulation valve if they are needed, in order to be sure that the unit works with water
fl ow values indicated in the tables. Specially for heat pump units AWH in heating mode, if the unit works with water fl ow below
specifi ed values, the unit can be seriously damaged, water exchanger can be frozen.
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AQUALEAN - AWC/AWH - MIL118E-1407 / 10-2013