hVac controls guide for Plans examiners and Building inspectors

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Figure 1: Mechanical floor plan showing thermostats in multiple locationsFigure 2: Control diagram for variable air volume (VAV) box demonstrating 5 degree deadbandZone Temperature Control Sequence• Heating set point (70°F), adjustable• Cooling set point (75°F), adjustable• Deadband of 5°F shall be maintainedbetween heating and cooling set pointsAir Flow (%)100min70 75Zone Temperature (°F)Figure 3: Sample control sequence showing setback capabilitiesUnoccupied Mode:1. Air handling units and terminal units will go to unoccupied mode when room occupancy sensors andschedule program define the zone(s) served to be unoccupied.2. Zone temperature set point will reset to 55°F (heating mode) and 85°F (cooling mode).3. Outside air damper in closed position.12 Control Requirements for All Systems
Figure 4: Sample control sequence showing optimum start capabilitiesOptimum Start: The system shall calculate the time required to bring zones from the unoccupied temperatureand humidity condition to occupied condition. This time shall be used to schedule the warm-up/cool-downperiod such that occupied conditions are achieved just prior to the scheduled occupied period.Building InspectionSuggested Compliance Check(s):• Verify that programmable thermostats and temperature and humidity sensors havebeen installed as shown in the approved mechanical plans (figure 5 and 7).• Confirm that the installed thermostats have deadband and setback capabilities. Singlesetpoint thermostats with a heat/cool/auto setting do not comply (figure 6).Figure 5: Temperature sensor, as may be installed in a building with a building automation systemFigure 6: Programmable thermostat, as may be installed in building using packaged HVAC equipmentControl Requirements for All Systems 13
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: Control Requirements for All System
Page 15 and 16: d) Automatic setback and shutdown c
Page 17 and 18: Figure 9: VSD installed on a supply
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.

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