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5. Water Quality
Process Fluid Water Quality
To prevent excessive fouling and internal coil corrosion, the recirculating water quality should remain within the limits indicated
in Table 1. A competent water treatment company should be consulted for the specific water treatment to be used that is
suitable for all materials of construction used in the entire system. For higher pH levels, it is recommended to add a specific
copper corrosion inhibitor such as TT or BZT with a target residual concentration of above 2 ppm (multiple dosages might be
required).
Adiabatic Pre-Cooler Water Quality
and drain the water system, thereby eliminating the need for water treatment. However, there may be
unusual circumstances where chemicals or biological contaminants could be introduced into the
recirculating water system, that could be harmful if inhaled or ingested. Wear appropriate respiratory
protection, when exposed to the discharge air stream or to the mists produced by cleaning activities
associated with the recirculating water system or adiabatic pre-cooler pads.
To control corrosion and scale, the water chemistry of the adiabatic pre-cooler water must be kept within BAC's water quality
guidelines available at baltimoreaircoil.com. Material of construction for the TrilliumSeries™ Adiabatic Cooler – TRF is
thermosetting hybrid polymer.
The primary water treatment control method for the adiabatic pre-cooler is to provide sufficient water to the pre-cooler medium
to keep it flushed. If sufficient water is not provided to completely wet and flush the entire pre-cooler medium surface, deposits
of minerals will occur. Adiabatic pre-cooler water quality should be of potable supply. In the case of non-treated water, the
temperature should be kept below 68ºF (20ºC).
The sump will automatically drain when a maximum cycle of concentration is reached. The unit can also be set up to
periodically drain the sump and dry the adiabatic pre-cooler pads. These features reduce the risk of microbiological
contamination. Check your local codes and regulations for water treatment requirements.
The drained water may be suitable for non-potable use such as irrigation. Refer to local codes and regulations to determine
allowable uses.
In applications where hard water is supplied to the unit, a water softener may extend the life of the adiabatic pre-cooler pads.
TrilliumSeries™ Adiabatic Cooler - TRF Operation & Maintenance Manual – Water Quality
Variable
pH
Hardness (as CaCO3)
Alkalinity (as CaCO3)
Conductivity
Chlorides
Total suspended solids
COD (chemical oxygen demand)
Table 1. Heat Exchanger Circulated Water Quality
: The TrilliumSeries™ Adiabatic Cooler controls are set up to periodically flush
Copper
6.5 -10.5
0-500 mg/l
0-500 mg/l
< 3300 μS/cm
< 250 mg/l
< 10 mg/l
< 50 ppm
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