Walchem WDT400 Series Instruction Manual

Walchem WDT400 Series Instruction Manual Manual pdf 7 page image

3.0 UNPACKING & INSTALLATION3.1 Unpacking the unitInspect the contents of the carton. Please notify the carrier immediately if there are any signs of damageto the controller or its parts. Contact your distributor if any of the parts are missing. The carton shouldcontain: a WDT400 series controller and instruction manual. Any options or accessories will beincorporated as ordered.3.2 Mounting the electronic enclosureThe WDT series controller is supplied with mounting holes on the enclosure. It should be wall mountedwith the display at eye level, on a vibration-free surface, utilizing all four mounting holes for maximumstability. Use M6 (1/4" diameter) fasteners that are appropriate for the substrate material of the wall.The enclosure is NEMA 4X rated. The maximum operating ambient temperature is 122°F (50°C); thisshould be considered if installation is in a high temperature location. The enclosure requires thefollowing clearances:Top: 2" (50 mm)Left: 8" (203 mm)Right: 4" (102 mm)Bottom: 7" (178 mm)3.3 InstallationOnce the WDT series controller is mounted, the metering pumps may be located at any distance fromthe controller. The conductivity electrodes should be placed as close to the controller as possible, to amaximum distance of 250 ft. Under 25 ft is recommended. The cable must be shielded from backgroundelectrical noise. Always route low voltage (sensor) signals with at least a 6” separation from AC voltagewiring.Locate the electrode tees where an active sample of cooling tower water is available and where theelectrode can easily be removed for cleaning. They must be situated so that the tee is always full and theelectrode is never subjected to a drop in water level resulting in dryness. Refer to Figure 1 for typicalinstallation.IMPORTANT: To avoid cracking the female pipe threads on the supplied plumbing parts, use no morethan 3 wraps of Teflon® tape and thread in the pipe FINGER tight plus ½ turn! Do not use pipe dope toseal the threads of the flow switch because the clear plastic will crack!4