Instructions:
1. Obtain values of A, B, C and D from above tables
2. pHs = (9.3 + A + B ) – (C + D )
3. Practical Scaling Index = 2 pHs – pHeq
- if Index is 6.0, water is stable
- if Index is above 6.0, water is scale dissolving
- if index is below 6.0, water is scale forming
With Practical Scaling Index below 5.5, minimum recommended water flow in table "Minimum water flow rates"
needs to be increased, contact your local BAC-Balticare representative for support.
Biological control
The adiabatic pre-cooler and its controls have been designed to minimize the risk of uncontrolled growth of algae,
slimes and other micro-organisms such as Legionella:
1. No standing water
2. Complete drying of the pre-cooling system after each adiabatic cycle
3. Complete draining of all water distribution piping installed on the unit after each adiabatic cycle
CAUTION
The owner of the equipment is responsible for draining of all water piping feeding the adiabatic
pre-cooler to avoid stagnant water conditions.
4. Use of potable water supply at temperatures of 20 ºC or less, where Legionella is dormant
5. Aerosol free operation
When basic housekeeping practices are followed, and when the guidelines for operation and maintenance of this
bulletin are followed, problems related to uncontrolled growth of micro-organisms will be avoided.
Chemical treatment
A biocide program for biological control can be implemented in conjunction with the maintenance program for
increased operational safety. However, biological control should not be used in place of good housekeeping.
The two most commonly available biocides are chlorine and bromide. These chemicals have widespread success
in general application; however, caution should be practiced when using them in the adiabatic pre-cooling system.
Continuous dosages of chlorine or bromide could delignify the cellulose fibres of the pre-cooler media, and degrade
the stiffening agents.
RECOMMENDED CHLORINE / BROMIDE DOSAGES
Continuous Treatment: Not required when basic housekeeping practices are followed, and when the guidelines
for operation and maintenance of this bulletin are followed.
Shock Treatment: 3.0 – 5.0 PPM Free Halogens. Not recommended more often than once per quarter.
W W W . B A L T I M O R E A I R C O I L . E U
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