Cooling Tower Controllers

Cooling water circuits can be found in a range of industries all over the world. Normally circulatory cooling conditioned water is used where fresh water is not possible. Cooling water consumption is minimized and the whole system must be protected from corrosion, sediment and growth of biological organisms.

Nowadays ventilation and air conditioning system control has become a very important operation in view of the latest epidemics caused by various dangerous virus diseases, and the always present LEGIONELLA disease: prevention has become the prime concern.

In cooling systems water circulation present losses through evaporation and leakage, water flow must be replenish with fresh water make-up. To compensate the increase in salt concentration, blow-down (also called bleed) takes place, controlled by EC – ELECTRO CONDUCTIVITY measurement. Blow down operations prevents scaling and corrosion. Another important operation is the chemically conditioning of the make-up water by adding biocides thus disinfecting the water from germs and the growth of algae or biological organisms.

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FWT COMPREHENSIVE SOLUTIONS FOR COMPLETE COOLING TOWER SYSTEM

FWT has many years of experience and a comprehensive product range for all processes connected with cooling water conditioning, in a wide variety of designs for every application.

Disinfection
- Dosing systems for metering of sodium-calcium hypochlorite or bromide products
- Measurement and control technology for variable-dependent dosing of biocides

Dispersion
- Dosing systems for dosing of dispersant chemicals

Corrosion protection
- Dosing systems for metering of corrosion protection products and hardness stabilisers
- Dosing systems for dosing of dispersant chemicals

TWO controller series are available:

CTRL CD COOL_bocube connectors

CTRL EC COOL

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CTRL B EC COOL

CTRL EC COOL is a compact system for cooling tower control for centralising control that addresses the operation of cooling towers in a practical and economic way, specially designed for cooling water treatment and blow-down operations, air scrubbers and humidifiers of any industrial air-conditioning systems.
The controller integrates other process equipment such as: a range of Conductivity sensors (according to measuring range) and versatile control options for flow meters, blow-down solenoid or flap valves.

CTRL EC COOL is capable of:
• Automatically monitoring total dissolved solids and desalination through
CONDUCTIVITY measurements, driving an electro valve or via TIMER;
• Accurate dosing control of scale inhibitors and biocide;
• Corrosion inhibitor dosing via four modes;
• Dosing for two biocides dosing pumps;
• Biocide cycles via timer programming;
• Automatic blow-down operation lockout and pre-bleed operations;
• 4 -20mA analog current output mode for remote control equipment;
• Flow sensor (proximity switch function;
• Level control for external chemical tanks

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CTRL2 ECPH(RX) COOL

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CTRL2 ECPH(RX) COOL

CTRL2 ECPH(RX) COOL is a dual system for cooling tower control for centralising control that addresses the operation of cooling towers in a practical and economic way, specially designed for cooling water treatment and blow-down operations, air scrubbers and humidifiers of any industrial air-conditioning systems.

The controller integrates other process equipment such as: range of Conductivity sensors (according to measuring range), PH measurements can be changed to RX and versatile control options for flow meters, blow-down solenoid or flap valves.

CTRL2 ECPH(RX) COOL is capable of:
• Automatically monitoring total dissolved solids and desalination through
CONDUCTIVITY measurements, driving an electro valve or via TIMER;
• Control pH or Redox measurements;
• Accurate dosing control of scale inhibitors and biocide;
• Corrosion inhibitor dosing via four modes;
• Dosing for two biocides dosing pumps;
• Biocide cycles via timer programming;
• Automatic blow-down operation lockout and pre-bleed operations;
• 4 -20mA analog current output mode for remote control equipment;
• Flow sensor (proximity switch function;
• Level control for external chemical tanks


FUNCTIONS DESCRIPTION

BLEED OPERATIONS DRIVEN BY TIMER
Controller offers two modes concerning the Bleed mode (blow-down) operations of the EV:the internal timer independently of the conductivity level in the cooling tower will drive the EV.
This feature is suitable for easier programming or in case of conductivity probe failure or for easier programming.

CONDUCTIVITY mode:
it processes the conductivity level to control blow-down operations; displays shows measured values and transmits it via relay output to open EV electro valve. Electro Conductivity is monitored by a set point: once exceeding the set point, controller will open the solenoid valve and bleed the desalinated and conditioned water. Alarm settings High and low will ensure maximum control of conductivity parameters.

PH or redox control
CTRL2 ECPH(RX) COOL controller offers includes pH or Redox (for chlorine) control.
PH measurements can easily be changed to RX by a simple programming step and changing the type of electrode.

INHIBITOR DOSING CONTROL
EC COOL controller features 4 inhibitor dosing pump operations modes:

BLEED DIRECT starts Inhibitor dosing when the bleed valve is open (works in parallel to EV)

BLEED % inhibitor is dosed after EV closing in % time equal to the last discharge time duration

TIMER inhibitor dosing via an internal Timer: at the start of each period, dosing pump will work for a pre-set time.

WATER METER is active during the re-integration of makeup water and is driven by external water meter
pulse proportionally to flow

BIOCIDE DOSING CONTROL
CTRL EC COOL features 2 Biocide dosing programs. Most cooling tower systems include two biocides programs to ensure
efficient disinfection quality. Internal timer controls two dosing pumps and various metering processes.
Biocide mode features many steps to have the most accurate dosing operation with absolute precision.

Biocide 1 Program 01 Program number (up to 99 programs for each biocide)
Dosing time (m:s) 01:00 Biocide dosing pump active Time cycle

Start time (h:s) 10:30 Biocide dosing pump start dosing time

Days Enabled Mon : N..Y Biocide dosing pump operating days

Weeks 1:Y 2:N 3:N 4:N Biocide dosing pump operating week of the month