Boiler Efficiency and Combustion Control

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Plant Wide Controller (PWC) Overview
Preferred Instruments a division of Preferred
Utilities Mfg. Corp.
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Plant Wide Controller
The Plant Wide ControllerTM (PWC) is a
state-of-the-art boiler sequencing, control and
monitoring system. The PWC combines innovative
ease of operation, communication and expansion
capabilities with boiler application expertise.
Off-the-shelf, standard modulating Lead-Lag
applications can be expanded to control
circulating water variable speed pumps and
isolation valves while monitoring the flame
safeguard and boiler control systems.
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Easy to Operate
Key lockable Door Security
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Easy to Operate

• Hardwired Control Switches Indications

Firing Rate Control Dial
Firing Rate Auto / Man
0 - 100 Bargraph
Boiler On-Off-Auto
Status Indications
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Easy to Operate
LCD Graphic Display and Keypad

• Easy to use displays for
• Boiler Plant Control Monitoring
• Historical Trending
• Alarm Event Handling
• Boiler Plant Setup

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Easy to Operate
Display Keys

• Home Page -
• Boiler Overview Display
• Arrow Keys -
• Move Cursor
• Menu, Page Up, Down -
• Display Selection
• Alarm List -
• Alarm, Event Display
• Alarm Silence PB

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Home Page

• Lead / Lag Control
• Start Qty Control
• Sequence Control
• Custom
• Lead Rotate
• Alarm Status
• Time / Date Stamped
• Header Status
• Pressure / Temperature
• Setpoint
• Outside Temperature

• Status
• Started Boilers
• Warming Boilers
• Modulating Boilers
• Tripped Boilers

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Alarm Event Summary

• Up to 200 Alarms Events
• First in - First out
• Operator Actions
• Events
• Alarms
• Time Date Stamped

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Historical Trending

• An Essential Monitoring Tool
• Multiple(4) Pen Charts
• 8 min, 40 min., and
• 2, 8, 24 hour charts

• 8 channel, 2 Hr Historical Memory - Standard
• 32 Mb Historical Memory - Optional
• 32 ch AI 32 ch DI every 15 seconds for 30 days
• 90 or more days for less channels with low
  activity (depends on data compression efficiency)

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Easy Setup

• Fill In The Blanks
• Boiler Sequence
• PID Tuning
• Outdoor Reset Setup
• Day / Night Setback
• Day / Week Setback
• Week / Year Setback

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Outdoor Reset / Setback Temp.

• Easily Configured
• Normal Setpoints
• Setback Setpoints
• High Low Limits
• Outdoor Cutoff
• Automatic Graphical Representation

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EXPANDABLE

• PWC Front Door Open
• (2 to 5 boiler lead / lag configuration shown
  with three spare slots)

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CPU Board

• (2) Analog Inputs
• (4-20 mAdc /Thermistor)
• (1) Relay Output (SPDT, 8A)
• (1) RS232 programming Port
• (1) Isolated RS485 Port
• (Modbus or Bacnet Option)
• (1) Telephone Modem Option Card
• Dial in or dial out, 33.6 kb, RJ-11 jack, Data
  and Pagers
• (1) Printer Port (Alarms / Logs)

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Discrete Input

• (15) Inputs, 120 Vac, optically isolated
• (5) groups of isolated neutrals
• (15) LED status indications
• (2) 2A / 120 Vac Fuses

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Hand-Off-Auto Relay Output

• (5) Relay Outputs
• (8A inductive, 1/2 Hp, 120 Vac)
• (5) Hand-Off-Auto Toggle Switches
• Toggle Switch is directly wired into output
  circuit.
• (5) LED's for Output ON / OFF
• (5) LED's for Call for Operation
• (2) 2A / 120 Vac Fuses

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Auto/Manual Analog Output

• (5) Modulating Analog Outputs
• (5) Auto-Manual Toggle Switches
• "Manual" hardware overrides CPU
• Bumpless Manual to Auto Transfer
• (5) 0-100 Output Control Knobs
• (5) 0-100 Output Bargraphs
• Requires (1) Output Card per active channel, Any
  combination of 4-20 mA and 135 ohm cards

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Analog Input

• (8) UNIVERSAL Inputs
• Switch Selectable as
• 2 wire 4-20 mA, with internal 24 Vdc
• Thermistor, -60F - 300 F
• Thermocouple, Type J, 0 - 1200 F,
• 0-5 Vdc, potentiometers and other signals
• Pulse, 0.6 ppm - 4000 Hz, 0-15 Vdc pulsers for
  Oil, Gas, Water, kWh meters
• Enables Fuel Budget Fuel Consumption Tracking
• (8) LED status indications
• Power Ouputs and Signal Inputs are short circuit
  protected

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Relay Output

• (8) Isolated Relay Outputs
• ( 8A inductive, ½ Hp, 120 Vac)
• (2) SPDT, (6) NO-SPST
• (8) LED status indications
• (2) 2A / 120 Vac Fuses

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Communications

• To Customers
• Building Automation Systems
• (Modbus / Bacnet)

Pagers
(Modbus / Bacnet)
Diesels
Chillers etc.
Boilers
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Advanced Communication Capability

• Communications
• Modbus communication to BAS or SCADA
• Dial In From PC
• Dial Out to Alpha Numeric Pager

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Dial In From PC
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Availability

• Hard Service Manual
• Every Boiler Start / Stop Command Firing Rate
  can be set manually in the unlikely event of a
  CPU hardware failure or software corruption
• A CPU failure will not prevent central manual
  control of the boiler plant
• This is a UNIQUE FEATURE!
• Fault Monitoring
• Analog Inputs (thermisters, 4-20mA signals) are
  monitored LED used to show fault status

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Installation
Spare Terminals (typical)
Physical Separation Between Operation and Wiring
Screwed fast Cable Tie Downs
3/4 conduit connections
Power Fuses
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Custom Blockware
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Custom Displays
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Custom Charts
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Preferred Instruments
Preferred Instruments 31-35 South Street
Danbury CT T [phone] F (203)
798-7313 www.preferred-mfg.com