Walchem

Walchem W100W Cooling Tower and Boiler Controller

Walchem W100W cooling tower and boiler controller: three control relays, a universal sensor input, a 5-inch color touchscreen and multiple language support for cooling tower, boiler and condensate conductivity control.

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Technical specifications

Walchem W100W wall-mount controller with a graphic display, mounted next to a flow switch manifold and three pulse cables

Control outputs	Three relays (model code dependent): powered mechanical relays or dry contact relays, 6 A resistive, 1/8 HP
Display	5-inch color TFT display (800 x 480 pixels) with capacitive touchscreen and icon-based programming
Sensor input	Universal input, compatible with almost any sensor type needed: contacting conductivity (cell constants 0.1, 1.0, 10.0) or electrodeless conductivity (500-2,000,000 µS/cm)
Language support	Multiple languages
Analog output and digital inputs	Optional isolated 4-20 mA output for recording, datalogging or connection to building energy management systems; two digital inputs (interlock, contacting flowmeter, paddlewheel flowmeter)
Enclosure	Polycarbonate enclosure, NEMA 4X (IP66), 282 x 211 x 140 mm; ambient temperature -20 to 55 °C; 100-240 VAC, 50/60 Hz
Relay functions	Bleed on conductivity, bleed time proportional to makeup water volume, boiler blowdown on conductivity using intermittent sampling, feed in proportion to bleed time, feed time proportional to makeup water volume, feed as a percentage of elapsed time, biocide timer with pre-bleed and post-feed bleed lockout, alarm
Boiler and condensate sensors	Contacting conductivity sensors of 316 stainless steel and PEEK, up to 17 bar and 0-205 °C

The Walchem W100W cooling tower and boiler controller is an entry-level water treatment controller with a 5-inch color touchscreen, a universal sensor input and three control relays. It controls bleed or blowdown on conductivity and feeds treatment chemicals and biocide in cooling tower, boiler and condensate programs. As the Walchem distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) supplies W100W controllers, sensors and flow switch manifolds and provides application consulting for cooling tower and boiler programs.

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What it controls

The third control relay allows the controller to be used in more places than other entry-level products, and each relay can be given a different function. For cooling towers these include bleed on conductivity, bleed time proportional to makeup water volume, and a biocide timer with pre-bleed and post-feed bleed lockout options. For boilers they include blowdown on conductivity using intermittent sampling. Chemical feed can be proportional to bleed time, proportional to makeup water volume, or set as a percentage of elapsed time. An optional 4-20 mA output sends the reading to a recorder, datalogger or building energy management system.

Sensors

The universal sensor input works with graphite or 316 stainless steel contacting conductivity sensors for cooling towers, high-pressure tower sensors, electrodeless conductivity sensors, and 316 stainless steel and PEEK boiler and condensate sensors rated up to 17 bar and 205 °C. Panel-mounted flow switch manifolds are available with the sensor options. See the Walchem conductivity sensors for the sensor types.

For the same platform with a wider choice of sensors, see the W100W series wall-mount controller. For background on cooling tower programs see the cooling tower automation guide and the boiler water conductivity guide, and for the wider range see the Walchem cooling tower controllers page.

Applications

Boiler water treatment control
Cooling tower biocide control
Condensate water treatment control

Datasheets and manuals

Documents were last compared with the manufacturer's source on 2026-09-24.

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