1. When using the COMcheck software, the compliance report submitted by the permit holder shall indicate that the applicable code is.

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1 Energy Conservation Code Commercial Mechanical CHAPTER 5 WORKSHEET 1. When using the COMcheck software, the compliance report submitted by the permit holder shall indicate that the applicable code is. a North Carolina Energy Conservation Code b IECC c IECC d IECC 2. The NC specific COMcheck software may be used to demonstrate compliance for all of the following except. a. office building b. public school c. three story apartment building d. four story apartment building 3. The following are compliance path options for commercial buildings except. a. meet chapter 5 mandatory and prescriptive provisions b. meet NC Comcheck c. meet Section 507 Total Building Performance d. meet 2004 ASHRAE 90.1 plus 20% improvement 4. Chapter 5 contains requirements for all the following except. a. industrial process systems and equipment b. HVAC systems for building space conditioning c. lighting controls d. service water heating 5. Using Table (1), the minimum efficiency allowed for an electrically operated 120,000 Btu/h split system air cooled air conditioner is. a SEER b SEER c EER d EER 2012 Energy Conservation Code Page 1 of 10 Revised: 2/28/2013

2 6. Using Table (4), the minimum efficiency allowed for a gas fired warm air furnace of 200,000 Btu/h input is. a. 78% AFUE b. 82% AFUE c. 90% AFUE d. 100% AFUE 7. The supply of heating and cooling energy to each building zone shall be controlled by an individual. a. humidistat b. occupancy sensor c. economizer d. thermostat 8. Exceptions from the requirements of automatic off-hour control of thermostats for zones of HVAC systems include all the following except. a. zones that will be operated continuously b. zones with a full load demand exceeding 6,800 Btu/h supplied from a VAV system c. zones cooled by a packaged terminal air conditioners d. zones heated and cooled by a packaged terminal heat pumps 9. For which case below would a required shut-off damper not be allowed to be a gravity damper? a. Ducted outside air intake of 300 cfm b. Ducted exhaust of 400 cfm in a three story building c. Ducted outside air intake of 500cfm in a three story building d. Ducted exhaust of 200cfm 10. Given that an exception is not applicable, ventilation systems in commercial buildings exceeding square feet shall have demand controlled ventilation. a. 2,000 b. 2,500 c. 5,000 d. 10, Energy Conservation Code Page 2 of 10 Revised: 2/28/2013

3 11. Demand control ventilation systems in commercial buildings shall be capable of reducing outside air supply to at least per cent below design ventilation rates. a. 25% b. 50% c. 70% d. 100% 12. Given that an exception is not applicable, in all commercial buildings, spaces larger than square feet with a maximum occupant load of 40 or more people per 1,000 square feet of floor area shall include ventilation system demand control of those spaces. a. 250 b. 500 c d. 10, Given that an exception is not applicable, an energy recovery system is required for commercial building ventilation systems that have both a design supply air capacity of 5,000 cfm or greater and a minimum outside air supply of or greater of the design supply air quantity. a. 25% b. 50% c. 75% d. 85% 14. In commercial buildings, heating and cooling system supply and return ducts located in unconditioned space shall be insulated with a minimum of insulation. a. R-4 b. R-5 c. R-8 d. R In commercial buildings, heating and cooling system supply and return ducts located outdoors shall be insulated with a minimum of insulation. a. R-4 b. R-5 c. R-8 d. R Energy Conservation Code Page 3 of 10 Revised: 2/28/2013

4 16. In commercial buildings, heating and cooling system supply and return ducts located within a commercial building exterior wall that separates conditioned space from the outdoors shall be separated from the building exterior by a minimum of insulation. a. R-5 b. R-8 c. R-13 d. R In commercial buildings, heating and cooling system exhaust ducts located in conditioned space shall be insulated with a minimum of insulation or as otherwise required to prevent condensation formation on the duct exterior. a. R-0 b. R-4 c. R-5 d. R In commercial buildings, heating and cooling system supply ducts located within a return air plenum shall be insulated with a minimum of or as otherwise required to prevent condensation formation on the duct exterior. a. R-0 b. R-4 c. R-5 d. R In commercial buildings, the low-pressure heating and cooling ducts located in the following locations must be sealed except those located in. a. ventilated attics b. unconditioned spaces c. the conditioned spaces they serve d. ventilated crawl spaces 20. In commercial buildings, high pressure duct systems designed to operate in excess of 3 inches w.g. static pressure design pressure shall be leak-tested over representative sections totaling at least of the duct area. a. 25% b. 50% c. 75% d. 100% 2012 Energy Conservation Code Page 4 of 10 Revised: 2/28/2013

5 21. Given that the designed chilled water temperature is 45 0 F, the required minimum piping insulation thickness for 2 inch nominal pipe diameter chilled water piping serving a chilled water plant for a building HVAC system is. a. no requirement b. 1 ½ inches c. 2 inches d. 3 inches 22. Given that an exception is not applicable, test and balance activities for commercial building HVAC systems shall include. a. air system balancing only b. hydronic system balancing only c. both air system balancing and hydronic system balancing d. neither air system balancing nor hydronic system balancing 23. Given that a NC licensed design professional s seal is required for a commercial building project, the required Statement of Compliance HVAC System Installation document required to be submitted shall be prepared and signed by the. a. building owner b. contractor c. inspector d. NC licensed design professional 24. Heating systems installed to provide comfort heating outside a commercial building shall be systems and require special controls to shut off the system when no occupants are present. a. convective b. radiant c. conductive d. None allowed 25. Given that an exception does not apply for a commercial building HVAC system, supply air economizers shall be provided on each cooling system greater than or equal to 65,000 Btu/h when the building is located in. a. Zone 3A only b. Zone 4A only c. Zones 4A and 5A only d. Zones 3A, 4A, and 5A 2012 Energy Conservation Code Page 5 of 10 Revised: 2/28/2013

6 26. Supply air economizers, when required for commercial building HVAC systems, shall be capable of providing outdoor air. a. 25% b. 50% c. 75% d. 100% 27. Individual VAV fans with motors of or greater shall be driven by a mechanical or electrical variable speed drive or shall be equipped with other energy conserving controls as prescribed by the code. a. 5 horsepower b. 10 horsepower c. 20 horsepower d. 25 horsepower 28. Hydronic heating systems for commercial buildings comprised of a single boiler and greater than input design capacity shall include either a multistaged or modulating burner. a. 200,000 Btu/h b. 300,000 Btu/h c. 400,000 Btu/h d. 500,000 Btu/h 29. For commercial buildings, hydronic heating systems greater than or equal to output capacity supplying heated water to comfort conditioning systems shall include part load controls having the capability to automatically reset supply hot water temperature or reduce system pump flow by at least 50% of the design flow rate. a. 200,000 Btu/h b. 300,000 Btu/h c. 500,000 Btu/h d. 1,000,000 Btu/h 30. For commercial buildings, generally, supply air systems serving multiple zones must be VAV systems and be provided with controls to reduce primary air supply to each space to a minimum before allowing any of the following to occur except for. a. reheating b. recooling c. recirculation d. mixing 2012 Energy Conservation Code Page 6 of 10 Revised: 2/28/2013

7 31. For commercial buildings, multiple zone HVAC systems shall include controls that are capable of automatically resetting the supply air temperature to at least of the difference between the design air supply temperature and the design room temperature in response to representative building loads or outdoor air temperature. a. 25% b. 50% c. 75% d. 100% 32. Which of the following is an example of a complex HVAC system? a. Two pipe heating system serving two zones with no cooling system installed b. Packaged terminal heat pump system of 24,000 BTU/h input capacity serving a single zone c. HVAC system with VAV units for multiple zones d. Gas fired warm air heating furnace system of 200,000 Btu/h input capacity serving a single zone 33. A new commercial building must also comply with one of the Additional Prescriptive Compliance Requirements listed in Section 506. Which of the following is not one of the Additional Prescriptive Compliance Requirements listed? a. Increased insulation b. More efficient mechanical equipment c. Reduced lighting power density d. Automatic daylighting control system 34. For a commercial building, the Section 507 Total Building Performance compares the energy cost of the proposed design to that of the standard reference design. a. daily b. monthly c. annual d. lifetime 2012 Energy Conservation Code Page 7 of 10 Revised: 2/28/2013

8 35. When the Section 507 Total Building Performance compliance approach is selected as the path to compliance for a commercial building, in addition to the required energy cost analysis, all of the following compliance documentation shall be provided to the inspector except. a. address of the residence b. an inspection checklist c. life cycle cost analysis d. name and version of the software 2012 Energy Conservation Code Page 8 of 10 Revised: 2/28/2013

9 Energy Conservation Code CHAPTER 5 Commercial Mechanical ANSWER KEY Number Answer Section 1. a EC c EC d EC a EC b EC Table (1) 6. a EC Table (4) 7. d EC b EC b EC d EC b EC b EC c EC b EC c EC b EC a EC a EC c EC Exception Energy Conservation Code Page 9 of 10 Revised: 2/28/2013

10 20. a EC b EC Table c EC , EC , EC d EC & Appendix b EC d EC Table (1) 26. d EC b EC d EC b EC c EC a EC c EC503.3, EC a EC c EC c EC Energy Conservation Code Page 10 of 10 Revised: 2/28/2013

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