Energy Management

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Controls Schematics Sequences Presented By
Billy Kodosky
Energy Management Integration Seminar
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Schematics Sequences

• Design Process
• Process Elements
• Interactive Examples
• VAV
• MUA w/ Energy Recovery
• Final Package

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Design Process

• More than one way to skin a cat
• Key elements
• Schematic (Cartoon)
• Sequence of Operation
• Detailed Points List
• ASHRAE Article
• June 2006

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Process Elements

• A. List All Systems To Be Controlled
• B. Cartoon
• C. List Components Modes
• Write Sequence Elements (simple)
• Add Points To Cartoon
• F. Final Points List

Make things as simple as possible, but no simpler!
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A. List All Systems To Be Controlled

• Sample Project
• VAV Packaged Rooftop Unit
• VAV Terminal Box
• Boiler Plant
• MUA unit

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Well Pick VAV Packaged RTU

• Assumptions
• 2-Stage DX Cooling
• 2-Stage Heating
• Single Supply Fan w/ VFD
• Economizer

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B. Cartoon For Each System
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B. Cartoon For Each System
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C. List Components Modes

• VAV Packaged Rooftop Unit
• Modes
• Occupied / Unoccupied
• Cooling
• Heating
• Economizer
• Components
• Refrigeration Section
• Supply Fan
• Outside Air Damper
• Return Air Damper

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C. List Components Modes

• VAV Packaged Rooftop Unit
• Modes
• Occupied / Unoccupied
• Cooling
• Heating
• Economizer
• Components
• DX Cooling Stages
• Supply Fan
• Economizer Dampers
• Heating Stages

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D. Write Each Sequence Element

• VAV Packaged Rooftop Unit
• Unoccupied Mode
• Unit shall remain in unoccupied mode until BAS
  calls for occupied or morning warm-up.
• Unoccupied Cooling (Space Temp gt 80)
• Unoccupied Heating (Space Temp lt 60)
• Morning Warm-Up Mode
• Call from Building Automation System (BAS)
• Supply Fan modulate to Static Pressure Setpoint
• Economizer dampers in full return air position
• Stage gas heat to maintain return air setpoint
• Stay in warm-up until morning warm-up call is
  removed by global controller.

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D. Write Each Sequence Element

• VAV Packaged Rooftop Unit
• Occupied Mode (Discharge Air Control)
• Supply fan shall modulate to maintain duct static
  pressure
• Cooling Mode
• When OA enthalpy is less than RA enthalpy the
  economizer dampers shall modulate to maintain
  discharge air temperature. Compressors can still
  run.
• When OA enthalpy is greater than RA enthalpy the
  mechanical cooling shall stage to maintain
  discharge air temperature.
• Heating?

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D. Write Each Sequence Element

• VAV Packaged Rooftop Unit
• Optional Modes
• Morning Cool Down
• Discharge Air Reset
• Safeties
• High Static Shutdown
• Low Limit Discharge Shutdown
• Alarms
• Clogged Filter
• Supply Fan Failure
• Compressor Failure (optional)
• Safeties Always Part of Alarming

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E. Add Points To Cartoon
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E. Add Points To Cartoon
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F. Final Point List
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Summary For VAV Rooftop

• Final Points List
• Sequence Of Operation
• Cartoon
• Add Sequences Points List To Specifications
• Add Cartoon To Drawing

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Time For Another

• Screw Einstein Lets Have Fun

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A. We Need Fresh Air

• Sample Project
• VAV Packaged Rooftop Unit
• VAV Terminal Box
• Boiler Plant
• MUA unit

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Fresh Air

• Assumptions
• Neutral Air Unit
• 2-Stage Dx Cooling
• Modulating Hot Gas Reheat
• Modulating Gas Heat
• Single Supply Fan Constant Volume
• Exhaust Fan w/ VFD For Building Static Pressure
  Control
• Energy Recovery Wheel
• Economizer

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B. Cartoon For MUA
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B. Cartoon For MUA
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C. List Components Modes

• Make Up Air Unit
• Modes
• Occupied / Unoccupied
• Cooling
• Components
• Refrigeration Section
• Supply Fan
• Outside Air Damper
• Return Air Damper

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C. List Components Modes

• Make Up Air Unit
• Modes
• Ventilation Mode
• Heating Mode
• Cooling Mode
• Dehumidification Mode
• Components
• DX Cooling Stages
• Supply Fan
• Exhaust Fan
• Economizer Dampers
• Heating Stages
• Energy Wheel
• Reheat Coil

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D. Write Each Sequence Element

• Make Up Air Unit
• Ventilation Mode
• Outside Air Temperature and Humidity are within
  parameters
• Supply Fan on
• Exhaust Fan Modulate To Maintain Bldg Static
• Wheel Off
• Cooling Off
• Heating Off
• Reheat Off

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D. Write Each Sequence Element

• Make Up Air Unit
• Heating Mode
• Outside Air Temperature lt 65
• Supply Fan on
• Exhaust Fan Modulate To Maintain Bldg Static
• Wheel On
• Cooling Off
• Heating Modulates To Maintain 70 DAT
• Reheat Off

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D. Write Each Sequence Element

• Make Up Air Unit
• Cooling Mode
• Outside Air Temperature gt 75
• Outdoor Air Humidity Low
• Supply Fan on
• Exhaust Fan Modulate To Maintain Bldg Static
• Wheel On
• Cooling On Staged To Maintain 70 DAT
• Heating Off
• Reheat Off

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D. Write Each Sequence Element

• Make Up Air Unit
• Dehumidification Mode
• Outside Air Temperature gt 75
• Outdoor Air Humidity High
• Supply Fan on
• Exhaust Fan Modulate To Maintain Bldg Static
• Wheel On
• Cooling Both Stages On
• Heating Off
• Reheat Coil Modulates To 70 DAT

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D. Write Each Sequence Element

• Make Up Air Unit
• Optional Modes
• Morning Cool Down
• Morning Warm Up
• High Space Humidity Dehumidification Mode
• Safeties
• Low Limit Discharge Shutdown
• Alarms
• Clogged Filter
• Supply Fan Failure
• Exhaust Fan Failure
• Compressor Failure (optional)

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E. Add Points To Cartoon
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E. Add Points To Cartoon
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F. Final Point List
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Summary Of MUA

• Final Points List
• Cartoon
• Add Sequences Points List To Specifications
• Add Cartoon To Drawing

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Thank You