Modulating Lead/Lag

Chief DispatcherThe Chief Dispatcher is a standard, application specific Modulating Lead/Lag Controllers for both Steam and Hot Water Boiler System.

Benefits

 

Better Steam or Hot Water Modulation System Control

  • “Smart” boiler sequencing to improve response time
  • Steam boiler “Base Load Auto-Shift” reduces cycling
  • Hot water boiler “Header” or “Boiler” pump sequencing
  • Firetube boiler thermal shock protection using blend valves
  • Condensing boiler logic maximizes lower firing rate operation to increase efficiency
Boiler Setup Displays
Boiler Setup Display		 Outdoor Reset Display
Outdoor Reset Display

Easy to Use Modulating Lead/Lag Control

  • “Plant Overview”, “Alarm”, “Historical Trend” and “Setup” displays enable informed initial setup and process assessment
  • In a single wall mounted enclosure, the Chief Dispatcher integrates a modem for off-site monitoring, RS485 Modbus communications, 24Vdc power supplies and outdoor reset functions.  No external control devices are required
Historical Trend Display
Historical Trend Display		 Plant Overview Display
Plant Overview Display

CardEasy to Order, Stock, and Field Upgrade

  • Complete system is ordered using a single part number
  • “Plug In” option boards can be used to upgrade a system in the field

 

PWC with doors open

"Smart" Boiler Sequencing

  • Boilers are automatically sequenced on/off to ensure that the number of boilers in service meets load demand
  • Chief Dispatcher immediately starts another boiler to replace the “Faulted” boiler
  • The operator may manually select the Lead boiler or allow the Lead Boiler to rotate automatically

"Hard Manual" Backup

  • Built-in hard-wired control switches and dials provide simple manual control for easy troubleshooting and service
  • Each boiler has an individual firing rate bargraph, “Manual” firing rate output knob and “Auto/Manual” switch

Modbus Communication Interface

  • Factory configured RS485 Modbus interface is available for Building Automation or SCADA system monitoring and control

Boiler Sequencing Historical Trending

  • Easy to use four pen charts allow quick system assessment and maintenance monitoring such as hot water temperature (drum psi) and boiler operating hour trends
  • Up to 32 analog values and 32 discrete values can be stored every 1, 5, 15 or 60 seconds
  • The historical memory can store 1 to 6 months worth of data

Telephone Modem

  • Enables PWC to “Dial out” to an alphanumeric pager and allows a user to “dial in” to the Chief Dispatcher to view all displays and make tuning adjustments
  • Selected alarms cause the modem to dial a pager service center telephone number
  • The message can include a 30-character facility name plus a 20-character alarm message
  • By using PWC_Remote™ software, a remote user can “dial in” to the modem to view any screen and “Press” any keypad button just as if they were standing in front of the controller

man on computer