Water Care; About Water Care - Baltimore Aircoil Company Trillium Series Operating And Maintenance Instructions Manual

DFCV-AD-EC
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WATER CARE

About water care

The adiabatic pre-cooler of the unit has been designed as direct-water system, without water re-circulation, without
pump. Therefore it is essential that the main cold-water supply connected to the adiabatic pre-cooler has adequate
pressure and flow rate for the pre-cooler being installed.
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, deposition will occur.
Many water related problems can be avoided if good system design and basic housekeeping practices are
followed. However, water treatment chemicals should NOT be used INSTEAD of following these practices:
• Provide, good, even water distribution (See table: Minimum recommended adiabatic pre-cooler water flow
rates)
• Clean distribution header on a regular basis
• Clean city water strainer on a regular basis
• Replace damaged or spent pre-cooler media
Refer to "Construction details" on page 4. Mains cold water is supplied to (6), and is fed to the water distribution
system (9), via a flow valve/meter (8). The recommended mains water supply pressure is minimum 3 bar, and the
flow valve/meter (8) needs to be adjusted at installation to feed a minimum water flow over the adiabatic pre-cooler
(See table: "Minimum recommended adiabatic pre-cooler water flow rates")
The minimum water flow to be distributed over the adiabatic pre-cooler depends on:
• Climate conditions, i.e. evaporation rate at design conditions
• General water quality
• Water scaling tendency (practical scaling index)
The minimum water flow rates given in table "Minimum recommended adiabatic pre-cooler water flow rates", are
valid for the following operating conditions:
• Maximum ambient temperature of 35 ºC at minimum relative humidity of 30 %.
• Minimum supply water quality (See table below "Minimum supply water quality").
• Practical scaling index of 5.5 – 8.0.
To control corrosion and scale, the water chemistry of the circulated water has to be kept within the water quality
guidelines of the specific materials of construction used, as listed in the following table(s).
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