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6.4 - Water Quality - Carrier Recommendations
The water supply must be analyzed and properly filtered,
treated and contain internal control devices to meet the
application and prevent corrosion, fouling and deterioration
of the pump components.
Consult a water treatment specialist or specialized literature
on the subject.
1. No ammonia ion NH4+ in the water, since they are
very harmful and attach the copper. This is one of the
most principal factors for copper pipe life. A content
of several tenths of mg / l will severely corrode copper
over time. If necessary, use sacrificial anodes.
2. Chloride ions Cl
-
are also detrimental to copper with
a risk of perforating corrosion. If possible, keep a level
below 10 mg/l.
3. Sulfate ions SO
4
2-
can cause perforating corrosion if its
content is greater than 30 mg/l.
4. No fluoride ion (< 0,1 mg/l).
5. No Fe ion Fe
2+
and Fe
3+
no negligible levels of dissolved
oxygen should be present. Dissolved iron <5 mg/l with
dissolved oxygen <5 mg/l.
6. Dissolved silicon: Silicon is an acid element of water
and can also lead to corrosion risks.
Content < 1mg/l.
7. Water hardness: TH > 2.8 °C. Values between 10 and 25
may be recommended. This will facilitate scaling that
can limit copper corrosion. TH values that are too high
can cause pipe blockage over time. A total alkalinity
(TAC) level below 100 is desirable.
8. Dissolved oxygen: Any sudden change in water
oxygenation conditions should be avoided. It is very
harmful to deoxygenate the water by mixing it with
inert gas, as is the excess of oxygen compounds
mixed with pure oxygen. Changing the oxygenation
conditions encourages the destabilization of copper
hydroxides and the widening of the particles.
9. Specific resistance - electrical conductivity: The higher
the specific resistance, the less likely it is to corrode.
Values above 3,000 Ohm / cm are desirable. A neutral
environment favors the maximum specific resistance
values. Electrical conductivity values of approximately
200-6000 S / cm may be recommended.
10. Ph: ideal neutral pH between 20-25 °C and 7 < pH < 8
-
If the water circuit is to be emptied for more than
one month, the complete circuit should be placed
under nitrogen to avoid any risk of corrosion by
differential aeration.
-
Charging and removing fluids from the heat
exchanger should be done with the devices that
are included in the water circuit by the installer.
Never use the heat exchanger unit to add heat
exchange fluid.
6.3 - Condenser coil
We recommend that fi nned coils are inspected regularly to
check for dirt. This depends on the environment where the
unit is installed, and will be worse in urban and industrial
installations and near trees that lose leaves.
To clean the coil, do the following:
• Remove fi bers and dust accumulated on the condenser
surface with a soft brush (or vacuum cleaner).
• Clean the coil with the appropriate cleaning agents.
We recommend Carrier products for coil cleaning:
• Product for traditional cleaning
• Product for cleaning and degreasing.
These products have a neutral pH, do not contain phosphates,
they are not harmful to the human body, and can be
discharged into the public sewer system.
Depending on the level of contamination, both products may
or may not be used diluted.
In routine maintenance, we recommend using 1 kg of the
concentrated product, diluted to 10%, to clear a 2m² coil
surface. This process can be performed with a Carrier gun, or
with a spray gun in the low-pressure position. One should be
careful with cleaning methods under pressure in order not to
damage the coil fi ns. The spraying on the coil should be done
as follows:
• In the direction of the fi ns;
• In the direction of the air fl ow;
• With a large diff user (25-30 °);
• At a distance of 300 mm.
Both cleaning products can be used for any of the following coil
fi nishes: Gold Fin Cu / Cu, Cu / Al, Cu / Al with Polual, Blygold
or Heresite protection.
It is not necessary to rinse the coil, since the pH of the product
is neutral. To make sure the coil is completely clean, we
recommend rinsing with a small stream of water. The water
pH value should be between 7 and 8.
Never use pressurized water without a large diffuser.
Concentrated or rotating water jets are strictly
prohibited. The correct and frequent cleaning
(approximately every three months) will prevent 2/3
the problems with corrosion.
WARNING
6. Maintenance & Repair (cont.)