The DC4500 is a bleed and feed cooling tower controller with dual biocide timers. Standard features include; four feed modes (Feed & Bleed, % of Time, % of Bleed, Flow meter Pulse), intermittent or continuous sampling, uS or PPM display, flow totalizer, manual test modes, temperature display, biocide cycle of 7, 14, or 28 days, biocide lockout, and conductivity or time-based biocide pre-bleed. Programming is simple and is accomplished with only three keys. The backlit liquid crystal display and LEDs provide a visual indication of operating conditions and equipment status.
BLEED or BLOWDOWN of system water by valve control can be based on several set point options:
FEED of chemical (inhibitor) can be based on four (4) different methods and the pump control can be either On/Off or externally-triggered Variable Speed:
DUAL BIOCIDE chemical addition may be accomplished by the use of two (2) individually programmable Relays or optocoupler outputs. These outputs provide control of two individual chemical addition pumps based on the following options:
ALARM indicators and relay outputs are energized based on the following conditions: