DUBAIWORLDCENTRALINTERNATIONALAIRPORT

PHASE I – Design of Buildings

Contract No. JXB1/BLD/431- PASSENGERTERMINALBUILDING

SECTION 15940

SEQUENCE OF OPERATIONS

CONTENTS

PART 1 - GENERAL

1.1RELATED DOCUMENTS

1.2SUMMARY

1.3DEFINITIONS

1.4SINGLE-ZONE, SINGLE-DUCT, CONSTANT-VOLUME, AIR-HANDLING UNIT CONTROL SEQUENCES

1.5SINGLE-ZONE, SINGLE-DUCT, VAV, AIR-HANDLING UNIT CONTROL SEQUENCES

1.6VENTILATION SEQUENCES

PART 2 - PRODUCTS (Not Applicable)

PART 3 - EXECUTION (Refer to Mechanical and Electrical “Schedule of Control Points” attached)

This STD-SPC uses FIDIC Contract terms: (eg.) "Engineer", "Employer", "Commencement Date", "Time for Completion", "Taking-Over", Etc, although the terms "Project site", "Work" and "Substantial Completion" have generally been retained unchanged. If a different Form of Contract is used, change such terms to match those in that Contract.

Verify that Section titles referenced in this Section are correct for this Project’s Specification; Section titles may have changed.

All Imperial values/dimensions included in the original AIA specifications have been inserted as hidden text and all Metric values/dimensions have been retained. Where products, which are manufactured to Imperial tolerances are required, the Specification Writer must ensure that the Metric values/dimensions retained are appropriate and correct. If need be, the Specification Writer can insert the (Imperial values/dimensions) directly after the Metric values/dimensions.

All references to “Evaluations” included in the original AIA specifications have been removed because these supporting evaluations notes may not be available to all Specification Writers using these DCA Master Specifications. However, these supporting evaluation notes provide very useful information, which aid the process of preparing specifications. Where these evaluation notes are available, the Specification Writer is advised to make reference to them while preparing specification sections.

PART 1 - GENERAL

1.1RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including Conditions of Contract and Division1 Specification Sections, apply to this Section.

1.2SUMMARY

  1. This Section includes general control sequences for HVAC systems, subsystems, and equipment.
  2. Refer to BMS drawings for detailed control sequence and relevant control diagrams for all systems.
  3. Related Sections include the following:

List below only products, construction, and equipment that the reader might expect to find in this Section but are specified elsewhere.

  1. Division15 Section "HVAC Instrumentation and Controls" for control equipment and devices and submittal requirements.

1.3DEFINITIONS

Retain acronym and abbreviation that remain after this Section has been edited.

  1. DDC: Direct-digital control(s).
  2. VAV: Variable air volume.

1.4SINGLE-ZONE, SINGLE-DUCT, CONSTANT-VOLUME, AIR-HANDLING UNIT CONTROL SEQUENCES

  1. Fan Control: System starts fan to run continuously.
  2. Signal alarm if fan fails to start as commanded.
  3. Smoke Control: Smoke detector, located in return air, signals alarm, stops fan, and closes smoke dampers when products of combustion are detected in air stream.
  4. Mixed-Air Control: When fan is running, system shall modulate outside-air and return-air dampers to maintain minimum outside air requirement.
  5. When outside-air temperature exceeds return-air temperature, set outside-air dampers to minimum position and return-air damper to maximum position.
  6. When return-air temperature exceeds outside-air temperature, set outside-air dampers to maximum position and return air damper to minimum position.
  7. Filters: When fan is running, differential air-pressure transmitter signals alarm when high-pressure conditions exist.
  8. Hydronic Cooling Coil: When fan is running, system modulates control valve to maintain return-air temperature.
  9. System resets supply-air temperature set point from return-air temperature.
  10. When fan is off, control valve to closed position.
  11. When fan is on, enable normal control.

Retain paragraph and subparagraphs above or below.

  1. Operator Station Display: Indicate the following on operator workstation display terminal:
  2. System graphic.
  3. System on-off indication.
  4. System fan on-off indication.
  5. Outside-air-temperature indication.
  6. Supply-air temperature indication.
  7. Return-air temperature indication.
  8. Return-air temperature set point.
  9. Mixed-air-temperature indication.
  10. Outside/ Return-air dampers position adjustment.
  11. Outside/Return-air dampers position indication
  12. Filter air-pressure-drop indication.
  13. Filter high-air-pressure set point.
  14. Cooling-coil control valve position adjustment.
  15. Cooling-coil control-valve position indication.

1.5SINGLE-ZONE, SINGLE-DUCT, VAV, AIR-HANDLING UNIT CONTROL SEQUENCES

  1. Supply-Fan Control: System starts fan to run continuously. Modulate variable-speed fan drive to maintain supply duct static pressure.
  2. Signal alarm if fan fails to start as commanded.
  3. Static-pressure controller located in fan discharge stops fan and signals alarm when static pressure rises above excessive-static-pressure set point.
  4. Set inlet guide vanes to closed position when fan is stopped.
  5. Set variable-speed drive to minimum speed when fan is stopped.

Delete first paragraph below if return-air fans are not used. Coordinate return-air fan control with exhaust fan control.

  1. Smoke Control: Smoke detector, located in return air, signals alarm, stops fan, and closes smoke dampers when products of combustion are detected in air stream.
  2. Mixed-Air Control: When fan is running, system shall modulate outside-air, return-air, and relief-air dampers to maintain minimum outside air requirement.
  3. When fan is running, open outside-air and relief-air dampers to minimum position.
  4. When outside-air temperature exceeds return-air temperature, set outside-air and relief-air dampers to minimum position and return-air damper to maximum position.
  5. During unoccupied periods, position outside-air and relief-air dampers closed and return-air dampers open.
  6. Filters: During occupied periods, when fan is running, differential air-pressure transmitter signals alarm when high-pressure conditions exist.
  7. Hydronic Cooling Coil: When fan is running, system modulates control valve to maintain supply-air temperature.
  8. Systemresets supply-air temperature set point from return-air temperature.
  9. During unoccupied periods, control valve to closed position.
  10. When fan is on, enable normal control.

Retain paragraph and subparagraphs above or below.

  1. Coordination of Air-Handling Unit Sequences: Ensure that mixed-air, cooling-coil controls have common inputs and do not overlap in function.
  2. Operator Station Display: Indicate the following on operator workstation display terminal:
  3. System graphic.
  4. System on-off indication.
  5. System occupied/unoccupied mode.
  6. System fan on-off indication.
  7. Outside-air-temperature indication.
  8. Outside-air enthalpy indication.
  9. Supply-air temperature indication.
  10. Supply-air temperature set point.
  11. Return-air temperature indication.
  12. Mixed-air-temperature indication.
  13. Outside/Return/Relief-air dampers position adjustment.
  14. Outside/Return/Relief-air dampers position indication.
  15. Filter air-pressure-drop indication.
  16. Filter high-air-pressure set point.
  17. Cooling-coil control-valve position adjustment.
  18. Cooling-coil control-valve position indication.
  19. Supply-fan-discharge static-pressure indication.
  20. Supply-fan-discharge static-pressure set point.
  21. Supply-fan airflow rate.
  22. Supply-fan speed.
  23. Return-air static-pressure indication.
  24. Return-air static-pressure set point.
  25. Return-fan airflow rate.
  26. Return-fan inlet vane position.
  27. Building static-pressure indication.
  28. Building static-pressure set point.

Retain paragraph and subparagraphs below for DDC system and pneumatic operators.

  1. VAV, Terminal Air Units with Hydronic Coils: Room thermostat modulates VAV damper and coil control valve. Room sensor reports temperature.
  2. Operator Workstation: Display the following data:
  3. Room/area served.
  4. Room temperature.
  5. Room temperature set point, occupied.
  6. Room temperature set point, unoccupied.
  7. Air-damper position as percent open.
  8. Control-valve position as percent open.

1.6VENTILATION SEQUENCES

  1. Fan shall start / stop either automatically through the control system or manually from the control panel.
  2. Fan shall start / stop automatically and immediately when interlocked with an equipment that is started /stopped.
  3. Gravity Roof Ventilator: Dampers shall open/close along in parallel with the fan operation.
  4. Exhaust Fan: Room thermostat.
  5. Kitchen Exhaust Fan: Occupancy sensor starts fan and energizes makeup air unit.

PART 2 - PRODUCTS (Not Applicable)

PART 3 - EXECUTION (Refer to Mechanical and Electrical “Schedule of Control Points” attached)

END OF SECTION 15940

SEQUENCE OF OPERATIONS

November 2006Section 15940 - Page 1/5