hVac controls guide for Plans examiners and Building inspectors
hVac controls guide for Plans examiners and Building inspectors hVac controls guide for Plans examiners and Building inspectors
Plan ReviewSuggested Compliance Check(s):• Review the fan schedule to see that large fans (5 hp and larger) arespecified with variable speed drives or two speed motors.Figure 8: Fan schedule indicating VSD to be providedFAN scheduleID Area Type Drive CFMT.S.P.(in H 2O)Basis ofDesignMax Wt.(lbs)Volt/PhElectricalHPControlPF-1 Stair UtilitysetPF-4 Elevator UtilitysetSF-1 Office VaneaxialRF-1 AHU-1 VaneaxialBelt 8000 0.5 400 480/3 7.5 VFDBelt 10000 0.5 400 480/3 7.5 VFDBelt 35000 200 480/3 40 VFDBelt 20000 200 480/3 25 VFDBuilding InspectionSuggested Compliance Check(s):• Verify that supply fans with motors greater or equal to 5 hp have been provided with VSDs (orother speed control devices) as indicated on the mechanical plans. Supply fans may be locatedon rooftops (simple systems) or mechanical rooms (complex systems) (figure 9). A buildingautomation system (BAS) may also show where equipment is controlled by a VSD (figure 10).16 Control Requirements for All Systems
Figure 9: VSD installed on a supply fanFigure 10: BAS screenshot indicating VSD control of supply fanCode SectionsIECCASHRAE2009: NA 2007: NA2012: NA 2010: 6.4.3.10VentilationThe basic requirement of controls relating to ventilation is that they be capable of reducing or shutting downventilation when it is not required. Many systems are required to have motorized supply air and exhaustdampers that automatically open when the zone served is scheduled to be occupied and close when the zoneis scheduled to be unoccupied. Systems with large ventilation requirements must also be capable of varyingthe amount of ventilation according with the real time needs of the zone.Control Requirements for All Systems 17
- Page 2 and 3: ContentsIntroduction ..............
- Page 5 and 6: Commercial buildingControl requirem
- Page 7 and 8: Prescriptive requirementsfor Comple
- Page 9 and 10: Code Requirements andCompliance Che
- Page 11 and 12: Control Requirements for All System
- Page 13 and 14: Figure 4: Sample control sequence s
- Page 15: d) Automatic setback and shutdown c
- Page 19 and 20: Figure 13: Motorized damperFigure 1
- Page 21 and 22: Building InspectionSuggested Compli
- Page 23 and 24: 4) The supply of outside air is red
- Page 25 and 26: ) Control strategyEconomizers must
- Page 27 and 28: 4) The supply of outside air is red
- Page 29 and 30: must be positioned well down the du
- Page 31 and 32: Figure 23: BAS screen shot indicati
- Page 33 and 34: Code SectionsIECCASHRAE2009: NA 200
- Page 35 and 36: Figure 27: Illustrated control sequ
- Page 37 and 38: Code SectionsIECCASHRAE2009: 503.4.
- Page 39: Building InspectionSuggested Compli
- Page 42 and 43: Building InspectionSuggested Compli
- Page 44 and 45: Figure 38: Sample control sequence
- Page 46: Building Technology ProgramThe U.S.
Figure 9: VSD installed on a supply fanFigure 10: BAS screenshot indicating VSD control of supply fanCode SectionsIECCASHRAE2009: NA 2007: NA2012: NA 2010: 6.4.3.10VentilationThe basic requirement of <strong>controls</strong> relating to ventilation is that they be capable of reducing or shutting downventilation when it is not required. Many systems are required to have motorized supply air <strong>and</strong> exhaustdampers that automatically open when the zone served is scheduled to be occupied <strong>and</strong> close when the zoneis scheduled to be unoccupied. Systems with large ventilation requirements must also be capable of varyingthe amount of ventilation according with the real time needs of the zone.Control Requirements <strong>for</strong> All Systems 17
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