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.
b.
c.
d.
2.
The NC specific COMcheck software may be used to demonstrate compliance for
all of the following except ____________.
a.
b.
c.
d.
3.
2012 North Carolina Energy Conservation Code
2006 IECC
2009 IECC
2012 IECC
office building
public school
three story apartment building
four story apartment building
The following are compliance path options for commercial buildings except
_____________.
a.
b.
c.
d.
4.
Chapter 5 contains requirements for all the following except __________.
a.
b.
c.
d.
5.
meet chapter 5 mandatory and prescriptive provisions
meet NC Comcheck
meet Section 507 “Total Building Performance”
meet 2004 ASHRAE 90.1 plus 20% improvement
industrial process systems and equipment
HVAC systems for building space conditioning
lighting controls
service water heating
Using Table 503.2.3(1), the minimum efficiency allowed for an electrically operated
120,000 Btu/h split system air cooled air conditioner is ___________.
a.
b.
c.
d.
13.0 SEER
11.2 SEER
11.0 EER
10.0 EER
2012 Energy Conservation Code
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Revised: 2/28/2013
6.
Using Table 503.2.3(4), the minimum efficiency allowed for a gas fired warm air
furnace of 200,000 Btu/h input is ___________.
a.
b.
c.
d.
7.
The supply of heating and cooling energy to each building zone shall be controlled
by an individual _____________.
a.
b.
c.
d.
8.
78% AFUE
82% AFUE
90% AFUE
100% AFUE
humidistat
occupancy sensor
economizer
thermostat
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.
b.
c.
d.
10.
Ducted outside air intake of 300 cfm
Ducted exhaust of 400 cfm in a three story building
Ducted outside air intake of 500cfm in a three story building
Ducted exhaust of 200cfm
Given that an exception is not applicable, ventilation systems in commercial
buildings exceeding __________ square feet shall have demand controlled
ventilation.
a.
b.
c.
d.
2,000
2,500
5,000
10,000
2012 Energy Conservation Code
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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.
b.
c.
d.
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.
b.
c.
d.
13.
25%
50%
75%
85%
In commercial buildings, heating and cooling system supply and return ducts
located in unconditioned space shall be insulated with a minimum of
___________ insulation.
a.
b.
c.
d.
15.
250
500
1000
10,000
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.
b.
c.
d.
14.
25%
50%
70%
100%
R-4
R-5
R-8
R-12
In commercial buildings, heating and cooling system supply and return ducts
located outdoors shall be insulated with a minimum of ___________ insulation.
a.
b.
c.
d.
R-4
R-5
R-8
R-12
2012 Energy Conservation Code
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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.
b.
c.
d.
17.
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.
b.
c.
d.
18.
R-0
R-4
R-5
R-8
In commercial buildings, the low-pressure heating and cooling ducts located in
the following locations must be sealed except those located in __________.
a.
b.
c.
d.
20.
R-0
R-4
R-5
R-8
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.
b.
c.
d.
19.
R-5
R-8
R-13
R-15
ventilated attics
unconditioned spaces
the conditioned spaces they serve
ventilated crawl spaces
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.
b.
c.
d.
25%
50%
75%
100%
2012 Energy Conservation Code
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Revised: 2/28/2013
21.
Given that the designed chilled water temperature is 450 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.
b.
c.
d.
22.
Given that an exception is not applicable, test and balance activities for
commercial building HVAC systems shall include _____________.
a.
b.
c.
d.
23.
building owner
contractor
inspector
NC licensed design professional
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.
b.
c.
d.
25.
air system balancing only
hydronic system balancing only
both air system balancing and hydronic system balancing
neither air system balancing nor hydronic system balancing
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.
b.
c.
d.
24.
no requirement
1 ½ inches
2 inches
3 inches
convective
radiant
conductive
None allowed
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.
b.
c.
d.
Zone 3A only
Zone 4A only
Zones 4A and 5A only
Zones 3A, 4A, and 5A
2012 Energy Conservation Code
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26.
Supply air economizers, when required for commercial building HVAC systems,
shall be capable of providing ___________ outdoor air.
a.
b.
c.
d.
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.
b.
c.
d.
28.
200,000 Btu/h
300,000 Btu/h
400,000 Btu/h
500,000 Btu/h
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.
b.
c.
d.
30.
5 horsepower
10 horsepower
20 horsepower
25 horsepower
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.
b.
c.
d.
29.
25%
50%
75%
100%
200,000 Btu/h
300,000 Btu/h
500,000 Btu/h
1,000,000 Btu/h
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.
b.
c.
d.
reheating
recooling
recirculation
mixing
2012 Energy Conservation Code
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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.
b.
c.
d.
32.
25%
50%
75%
100%
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.
b.
c.
d.
34.
Increased insulation
More efficient mechanical equipment
Reduced lighting power density
Automatic daylighting control system
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.
b.
c.
d.
2012 Energy Conservation Code
daily
monthly
annual
lifetime
Page 7 of 10
Revised: 2/28/2013
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.
b.
c.
d.
address of the residence
an inspection checklist
life cycle cost analysis
name and version of the software
2012 Energy Conservation Code
Page 8 of 10
Revised: 2/28/2013
Energy Conservation Code
CHAPTER 5
Commercial Mechanical
ANSWER KEY
Number
Answer Section
1.
a
EC501.1
2.
c
EC501.1
3.
d
EC501.1
4.
a
EC501.2
5.
b
EC503.2.3 Table 503.2.3(1)
6.
a
EC503.2.3 Table 503.2.3(4)
7.
d
EC503.2.4.1
8.
b
EC503.2.4.3
9.
b
EC503.2.4.4
10.
d
EC503.2.5.1
11.
b
EC503.2.5.1
12.
b
EC503.2.5.1
13.
c
EC503.2.6
14.
b
EC503.2.7
15.
c
EC503.2.7
16.
b
EC503.2.7
17.
a
EC503.2.7
18.
a
EC503.2.7
19.
c
EC503.2.7.1.1 Exception 2
2012 Energy Conservation Code
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Revised: 2/28/2013
20.
a
EC503.2.7.1.3
21.
b
EC503.2.8 Table 503.2.8
22.
c
EC503.2.9.1, EC503.2.9.1.1, EC503.2.9.1.2
23.
d
EC503.2.9.3 & Appendix 5
24.
b
EC503.2.11
25.
d
EC503.3.1 Table 503.3.1(1)
26.
d
EC503.3.1
27.
b
EC503.4.2
28.
d
EC503.4.3
29.
b
EC503.4.3.4
30.
c
EC504.3.5
31.
a
EC503.4.5.4
32.
c
EC503.3, EC503.4.5
33.
a
EC506.1
34.
c
EC507.3
35.
c
EC507.4.1
2012 Energy Conservation Code
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Revised: 2/28/2013