[Federal Register Volume 78, Number 169 (Friday, August 30, 2013)]
[Rules and Regulations]
[Pages 53625-53630]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-21095]



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Federal Register / Vol. 78, No. 169 / Friday, August 30, 2013 / Rules 
and Regulations

[[Page 53625]]



DEPARTMENT OF ENERGY

10 CFR Part 430

[Docket No. EERE-2013-BT-STD-0009]
RIN 1904-AC96


Energy Conservation Program for Consumer Products: Test 
Procedures for Residential Furnaces and Boilers; Correction

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Final rule; technical correction.

-----------------------------------------------------------------------

SUMMARY: On July 10, 2013 the U.S. Department of Energy (DOE) published 
a final rule in the Federal Register that amended the test procedure 
for residential furnaces and boilers (78 FR 41265). Due to drafting 
errors, that document incorrectly redesignated several subsections in 
section 10 of the DOE test procedure regulation for those products in 
the Code of Federal Regulations (CFR). This final rule corrects those 
errors and updates related cross-references to reflect the revised 
section numbers in section 10.

DATES: Effective Date: August 30, 2013. The incorporation by reference 
of certain publications listed in the regulations was approved by the 
Director of the Federal Register as of November 10, 1997.

FOR FURTHER INFORMATION CONTACT:
Ms. Ashley Armstrong, U.S. Department of Energy, Office of Energy 
Efficiency and Renewable Energy, Building Technologies Office, EE-2J, 
1000 Independence Avenue SW., Washington, DC 20585-0121. Telephone: 
(202) 586-6590. Email: residential_furnaces_and_boilers@ee.doe.gov.
Mr. Eric Stas, U.S. Department of Energy, Office of the General 
Counsel, GC-71, 1000 Independence Avenue SW., Washington, DC 20585-
0121. Telephone: (202) 586-9507. Email: Eric.Stas@hq.doe.gov.

SUPPLEMENTARY INFORMATION: 

I. Background

    On July 10, 2013, DOE's Office of Energy Efficiency and Renewable 
Energy published a test procedure final rule in the Federal Register 
titled, ``Test Procedures for Residential Furnaces and Boilers'' 
(hereafter referred to as the ``July 2013 final rule''). 78 FR 41265. 
Since the publication of that final rule, it has come to DOE's 
attention that, due to a technical oversight, a certain part of the 
July 2013 final rule incorrectly redesignated the numbering of 
subsections within section 10 of DOE's test procedure regulations for 
residential furnaces and boilers found at 10 CFR, part 430, subpart B, 
Appendix N, ``Uniform Test Method for Measuring the Energy Consumption 
of Furnaces and Boilers.'' In addition, the July 2013 final rule did 
not include instructions to update the cross-references within Appendix 
N to reflect the renumbered subsections. During the development of 
amended test procedure for residential furnaces and boilers, DOE did 
not intend to redesignate the sections as indicated on page 41272 of 
the July 2013 final rule, and did intend to update the cross-references 
within Appendix N to reflect the appropriate section renumbering. 
Instead, these incorrect redesignations were the result of drafting 
errors in the final rule. Today's final rule corrects these errors by 
appropriately redesignating the subsections within section 10 of 
Appendix N and updating the internal cross-references in Appendix N to 
reflect the revised subsection numbering.

II. Need for Correction

    As published, the identified provisions in section 10 of 10 CFR 
part 430, subpart B, Appendix N will potentially result in confusion 
regarding how to correctly conduct DOE's residential furnaces and 
boilers test procedure. It was clearly not DOE's intention to change or 
eliminate additional sections beyond those explicitly cited for 
revision. At no place in the July 2013 final rule (or in the February 
4, 2013 notice of proposed rulemaking that preceded it (78 FR 7681)) 
did DOE discuss such modifications. These were inadvertent changes. 
Because today's final rule would simply effectuate the intended and 
proper renumbering of the relevant regulatory provisions without making 
substantive changes to those provisions, the changes addressed in this 
document are technical in nature. Accordingly, DOE finds that there is 
good cause under 5 U.S.C. 553(b)(B) to not issue a separate notice to 
solicit public comment on the changes contained in this document. 
Issuing a separate notice to solicit public comment would be 
impractical, unnecessary, and contrary to the public interest.

III. Procedural Requirements

    DOE has concluded that the determinations made pursuant to the 
various procedural requirements applicable to the July 10, 2013 test 
procedure final rule remain unchanged for this final rule technical 
correction. These determinations are set forth in the July 10, 2013 
final rule. 78 FR 41265, 41269-41272.

List of Subjects in 10 CFR Part 430

    Administrative practice and procedure, Confidential business 
information, Energy conservation, Household appliances, Imports, 
Incorporation by reference, Intergovernmental relations, Small 
businesses.

    Issued in Washington, DC on August 23, 2013.
Kathleen B. Hogan,
Deputy Assistant Secretary for Energy Efficiency, Energy Efficiency and 
Renewable Energy.
    For the reasons stated in the preamble, DOE amends part 430 of 
Chapter II, subchapter D of title 10, Code of Federal Regulations as 
set forth below:

PART 430--ENERGY CONSERVATION PROGRAM FOR CONSUMER PRODUCTS

0
1. The authority citation for part 430 continues to read as follows:

    Authority:  42 U.S.C. 6291-6309; 28 U.S.C. 2461 note.


0
2. Appendix N to subpart B of part 430 is amended by revising the 
introductory text after the appendix heading and sections 10.0 through 
10.11 to read as follows:

[[Page 53626]]

Appendix N to Subpart B of Part 430--Uniform Test Method for Measuring 
the Energy Consumption of Furnaces and Boilers

    Note: The procedures and calculations that refer to off mode 
energy consumption (i.e., sections 8.6 and 10.11 of this appendix N) 
need not be performed to determine compliance with energy 
conservation standards for furnaces and boilers at this time. 
However, any representation related to standby mode and off mode 
energy consumption of these products made after July 1, 2013 must be 
based upon results generated under this test procedure, consistent 
with the requirements of 42 U.S.C. 6293(c)(2). For furnaces 
manufactured on or after May 1, 2013, compliance with the applicable 
provisions of this test procedure is required in order to determine 
compliance with energy conservation standards. For boilers, the 
statute requires that after July 1, 2010, any adopted energy 
conservation standard shall address standby mode and off mode energy 
consumption for these products, and upon the compliance date for 
such standards, compliance with the applicable provisions of this 
test procedure will be required.

* * * * *
    10.0 Calculation of derived results from test measurements. 
Calculations shall be as specified in section 11 of ANSI/ASHRAE 103-
1993 (incorporated by reference, see Sec.  430.3) and the October 
24, 1996, Errata Sheet for ASHRAE 103-1993, except for sections 
11.5.11.1, 11.5.11.2, and appendices B and C; and as specified in 
sections 10.1 through 10.11 and Figure 1 of this appendix.
    10.1 Annual fuel utilization efficiency. The annual fuel 
utilization efficiency (AFUE) is as defined in sections 11.2.12 
(non-condensing systems), 11.3.12 (condensing systems), 11.4.12 
(non-condensing modulating systems), and 11.5.12 (condensing 
modulating systems) of ANSI/ASHRAE 103-1993 (incorporated by 
reference, see Sec.  430.3), except for the definition for the term 
EffyHS in the defining equation for AFUE. 
EffyHS is defined as:
    EffyHS = heating seasonal efficiency as defined in 
sections 11.2.11 (non-condensing systems), 11.3.11 (condensing 
systems), 11.4.11 (non-condensing modulating systems), and 11.5.11 
(condensing modulating systems) of ANSI/ASHRAE 103-1993, except that 
for condensing modulating systems sections 11.5.11.1 and 11.5.11.2 
are replaced by sections 10.2 and 10.3 of this appendix. 
EffyHS is based on the assumptions that all weatherized 
warm air furnaces or boilers are located outdoors, that warm air 
furnaces which are not weatherized are installed as isolated 
combustion systems, and that boilers which are not weatherized are 
installed indoors.
    10.2 Part-Load Efficiency at Reduced Fuel Input Rate. Calculate 
the part-load efficiency at the reduced fuel input rate, 
EffyU,R, for condensing furnaces and boilers equipped 
with either step modulating or two-stage controls, expressed as a 
percent and defined as:
[GRAPHIC] [TIFF OMITTED] TR30AU13.000

Where:

LL,A = value as defined in section 11.2.7 of ASHRAE 103-
1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103-
1993 at reduced input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103-
1993 at reduced input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 
103-1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 
103-1993,
QP = pilot flame fuel input rate determined in accordance 
with section 9.2 of ASHRAE 103-1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 
103-1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 
103-1993 at reduced input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 
103-1993 at reduced input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 
103-1993 at reduced input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 
103-1993 at reduced input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 
103-1993 at reduced input rate,
CJ = jacket loss factor and equal to:
    = 0.0 for furnaces or boilers intended to be installed indoors
    = 1.7 for furnaces intended to be installed as isolated 
combustion systems
    = 2.4 for boilers (other than finned-tube boilers) intended to 
be installed as isolated combustion systems
    = 3.3 for furnaces intended to be installed outdoors
    = 4.7 for boilers (other than finned-tube boilers) intended to 
be installed outdoors
    = 1.0 for finned-tube boilers intended to be installed outdoors
    = 0.5 for finned-tube boilers intended to be installed in 
internal combustion system applications
LS,SS = value as defined in section 11.5.6 of ASHRAE 103-
1993 at reduced input rate,

[[Page 53627]]

CS = value as defined in section 11.5.10.1 of ASHRAE 103-
1993 at reduced input rate.

    10.3 Part-Load Efficiency at Maximum Fuel Input Rate. Calculate 
the part-load efficiency at maximum fuel input rate, 
EffyU,H, for condensing furnaces and boilers equipped 
with two-stage controls, expressed as a percent and defined as:
[GRAPHIC] [TIFF OMITTED] TR30AU13.001

Where:

LL,A = value as defined in section 11.2.7 of ASHRAE 103-
1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103-
1993 at maximum input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103-
1993 at maximum input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 
103-1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 
103-1993,
QP = pilot flame fuel input rate determined in accordance 
with section 9.2 of ASHRAE 103-1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 
103-1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 
103-1993 at maximum input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 
103-1993 at maximum input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 
103-1993 at maximum input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 
103-1993 at maximum input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 
103-1993 at maximum input rate,
CJ = value as defined in section 10.2 of this appendix,
LS,SS = value as defined in section 11.5.6 of ASHRAE 103-
1993 at maximum input rate,
CS = value as defined in section 11.5.10.1 of ASHRAE 103-
1993 at maximum input rate.

    10.4 National average burner operating hours, average annual 
fuel energy consumption, and average annual auxiliary electrical 
energy consumption for gas or oil furnaces and boilers.
    10.4.1 National average number of burner operating hours. For 
furnaces and boilers equipped with single stage controls, the 
national average number of burner operating hours is defined as:

BOHSS = 2,080 (0.77) A DHR-2,080 B

Where:

2,080 = national average heating load hours
0.77 = adjustment factor to adjust the calculated design heating 
requirement and heating load hours to the actual heating load 
experienced by the heating system
DHR = typical design heating requirements as listed in Table 8 (in 
unit of kBtu/h) of ANSI/ASHRAE Standard 103-1993, using the proper 
value of QOUT defined in 11.2.8.1 of ANSI/ASHRAE Standard 
103-1993
A = 100,000/[341,300(yP PE + yIG 
PEIG + yBE) + (QIN -
QP)EffyHS ], for forced draft unit, indoors
    = 100,000/[341,300(yP PE Effmotor + 
yIG PEIG + y BE) + (QIN -
QP)EffyHS ], for forced draft unit, ICS,
    = 100,000/[341,300(yP PE(1 - Effmotor) + 
yIG PEIG + y BE) + (QIN -
QP)EffyHS ], for induced draft unit, indoors, 
and
    = 100,000/[341,300(yIG PEIG + yBE) + 
(QIN -QP)EffyHS ], for induced 
draft unit, ICS
B = 2 QP (EffyHS)(A)/100,000

Where:

Effmotor = Power burner motor efficiency provided by 
manufacturer,
    = 0.50, an assumed default power burner efficiency if not 
provided by manufacturer.
100,000 = factor that accounts for percent and kBtu
PE = burner electrical power input at full-load steady-state 
operation, including electrical ignition device if energized, as 
defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-1993
yP = ratio of induced or forced draft blower on-time to 
average burner on-time, as follows:
    1 for units without post purge;
    1 + (tP/3.87) for single-stage furnaces with post 
purge;
    1 + (tP/10) for two-stage and step modulating 
furnaces with post purge;
    1 + (tP/9.68) for single-stage boilers with post 
purge; or
    1 + (tP/15) for two-stage and step modulating boilers 
with post purge.
PEIG = electrical input rate to the interrupted ignition 
device on burner (if employed), as defined in 8.1 of this appendix
yIG = ratio of burner interrupted ignition device on-time 
to average burner on-time, as follows:
    0 for burners not equipped with interrupted ignition device;
    (tIG/3.87) for single-stage furnaces;
    (tIG/10) for two-stage and step modulating furnaces;
    (tIG/9.68) for single-stage boilers; or
    (tIG/15) for two-stage and step modulating boilers.
tIG = on-time of the burner interrupted ignition device, 
as defined in 8.1 of this appendix

[[Page 53628]]

tP = post purge time as defined in 8.2 (furnace) or 8.4 
(boiler) of this appendix
     = 0 if tP is equal to or less than 30 seconds.
y = ratio of blower or pump on-time to average burner on-time, as 
follows:
    1 for furnaces without fan delay;
    1 for boilers without a pump delay;
    1 + (t\+\ - t-)/3.87 for single-stage furnaces with 
fan delay;
    1 + (t\+\ - t-)/10 for two-stage and step modulating 
furnaces with fan delay;
    1 + (t\+\/9.68) for single-stage boilers with pump delay; or
    1 + (t\+\/15) for two-stage and step modulating boilers with 
pump delay.
BE = circulating air fan or water pump electrical energy input rate 
at full-load steady-state operation, as defined in ANSI/ASHRAE 
Standard 103-1993
QIN = as defined in 11.2.8.1 of ANSI/ASHRAE Standard 103-
1993
QP = as defined in 11.2.11 of ANSI/ASHRAE Standard 103-
1993
EffyHS = as defined in 11.2.11 (non-condensing systems) 
or 11.3.11.3 (condensing systems) of ANSI/ASHRAE Standard 103-1993, 
percent, and calculated on the basis of:
    ICS installation, for non-weatherized warm air furnaces;
    indoor installation, for non-weatherized boilers; or
    outdoor installation, for furnaces and boilers that are 
weatherized.
2 = ratio of the average length of the heating season in hours to 
the average heating load hours
t\ + \ = as defined in 9.5.1.2 of ANSI/ASHRAE Standard 103-1993 or 
8.4 of this appendix
t- = as defined in 9.6.1 of ANSI/ASHRAE Standard 103-1993

    10.4.1.1 For furnaces and boilers equipped with two-stage or 
step modulating controls, the average annual energy used during the 
heating season, EM, is defined as:

EM = (QIN -QP) BOHSS + 
(8,760-4,600)QP

Where:

QIN = as defined in 11.4.8.1.1 of ANSI/ASHRAE Standard 
103-1993
QP = as defined in 11.4.12 of ANSI/ASHRAE Standard 103-
1993
BOHSS = as defined in section 10.4.1 of this appendix, in 
which the weighted EffyHS as defined in 11.4.11.3 or 
11.5.11.3 of ANSI/ASHRAE Standard 103-1993 is used for calculating 
the values of A and B, the term DHR is based on the value of 
QOUT defined in 11.4.8.1.1 or 11.5.8.1.1 of ANSI/ASHRAE 
Standard 103-1993, and the term (yP PE + 
yIGPEIG + yBE) in the factor A is increased by 
the factor R, which is defined as:
R = 2.3 for two-stage controls
     = 2.3 for step modulating controls when the ratio of minimum-
to-maximum output is greater than or equal to 0.5
     = 3.0 for step modulating controls when the ratio of minimum-
to-maximum output is less than 0.5
A = 100,000/[341,300(yP PE + yIG 
PEIG + y BE) R + (QIN -QP) 
EffyHS ], for forced draft unit, indoors
     = 100,000/[341,300(yP PE Effmotor + 
yIG PEIG + y BE) R + (QIN -
QP)EffyHS ], for forced draft unit, ICS,
     = 100,000/[341,300(yP PE(1-Effmotor) + 
yIG PEIG + y BE) R + (QIN -
QP) EffyHS ], for induced draft unit, indoors, 
and
     = 100,000/[341,300(yIG PEIG + y BE) R + 
(QIN -QP) EffyHS ], for induced 
draft unit, ICS

Where:

Effmotor = Power burner motor efficiency provided by 
manufacturer,
     = 0.50, an assumed default power burner efficiency if none 
provided by manufacturer.
EffyHS = as defined in 11.4.11.3 or 11.5.11.3 of ANSI/
ASHRAE Standard 103-1993, and calculated on the basis of:
    --ICS installation, for non-weatherized warm air furnaces
    --indoor installation, for non-weatherized boilers
    --outdoor installation, for furnaces and boilers that are 
weatherized
8,760 = total number of hours per year
4,600 = as specified in 11.4.12 of ANSI/ASHRAE Standard 103-1993
    10.4.1.2 For furnaces and boilers equipped with two-stage or 
step modulating controls, the national average number of burner 
operating hours at the reduced operating mode is defined as:

BOHR = XR EM/QIN,R

Where:

XR = as defined in 11.4.8.7 of ANSI/ASHRAE Standard 103-
1993
    EM = as defined in section 10.4.1.1 of this appendix
    QIN,R = as defined in 11.4.8.1.2 of ANSI/ASHRAE 
Standard 103-1993
    10.4.1.3 For furnaces and boilers equipped with two-stage 
controls, the national average number of burner operating hours at 
the maximum operating mode (BOHH) is defined as:
BOHH = XH EM/QIN

Where:

XH = as defined in 11.4.8.6 of ANSI/ASHRAE Standard 103-
1993
EM = as defined in section 10.4.1.1 of this appendix
QIN = as defined in 11.4.8.1.1 of ANSI/ASHRAE Standard 
103-1993

    10.4.1.4 For furnaces and boilers equipped with step modulating 
controls, the national average number of burner operating hours at 
the modulating operating mode (BOHM) is defined as:

BOHM = XH EM/QIN,M

Where:

XH = as defined in 11.4.8.6 of ANSI/ASHRAE Standard 103-
1993
EM = as defined in section 10.4.1.1 of this appendix
QIN,M = QOUT,M/(EffySS,M/100)
QOUT,M = as defined in 11.4.8.10 or 11.5.8.10 of ANSI/
ASHRAE Standard 103-1993, as appropriate
EffySS,M = as defined in 11.4.8.8 or 11.5.8.8 of ANSI/
ASHRAE Standard 103-1993, as appropriate, in percent
100 = factor that accounts for percent

    10.4.2 Average annual fuel energy consumption for gas or oil 
fueled furnaces or boilers. For furnaces or boilers equipped with 
single-stage controls, the average annual fuel energy consumption 
(EF) is expressed in Btu per year and defined as:

EF = BOHSS (QIN -
QP)+8,760 QP

Where:

BOHSS = as defined in 10.4.1 of this appendix
QIN = as defined in 11.2.8.1 of ANSI/ASHRAE Standard 103-
1993
QP = as defined in 11.2.11 of ANSI/ASHRAE Standard 103-
1993
8,760 = as specified in 10.4.1.1 of this appendix

    10.4.2.1 For furnaces or boilers equipped with either two-stage 
or step modulating controls, EF is defined as:

EF = EM + 4,600QP

Where:

EM = as defined in 10.4.1.1 of this appendix
4,600 = as specified in 11.4.12 of ANSI/ASHRAE Standard 103-1993
QP = as defined in 11.2.11 of ANSI/ASHRAE Standard 103-
1993

    10.4.3 Average annual auxiliary electrical energy consumption 
for gas or oil-fueled furnaces or boilers. For furnaces and boilers 
equipped with single-stage controls, the average annual auxiliary 
electrical consumption (EAE) is expressed in kilowatt-
hours and defined as:

EAE = BOHSS (yP PE + yIG 
PEIG + yBE) + ESO

Where:

BOHSS = as defined in 10.4.1 of this appendix
PE = as defined in 10.4.1 of this appendix
yP = as defined in 10.4.1 of this appendix
yIG = as defined in 10.4.1 of this appendix
PEIG = as defined in 10.4.1 of this appendix
y = as defined in 10.4.1 of this appendix
BE = as defined in 10.4.1 of this appendix
ESO = as defined in 10.11 of this appendix.

    10.4.3.1 For furnaces or boilers equipped with two-stage 
controls, EAE is defined as:

EAE = BOHR (yP PER + 
yIG PEIG + yBER) + BOHH 
(yP PEH + yIG PEIG + y 
BEH) + ESO

Where:

BOHR = as defined in 10.4.1.2 of this appendix
yP = as defined in 10.4.1 of this appendix
PER = as defined in 9.1.2.2 and measured at the reduced 
fuel input rate of ANSI/ASHRAE Standard 103-1993, (incorporated by 
reference, see Sec.  430.3)
yIG = as defined in 10.4.1 of this appendix
PEIG = as defined in 10.4.1 of this appendix
y = as defined in 10.4.1 of this appendix
BER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
reduced fuel input rate
BOHH = as defined in 10.4.1.3 of this appendix
PEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
maximum fuel input rate
BEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
maximum fuel input rate
ESO = as defined in 10.11 of this appendix.

    10.4.3.2 For furnaces or boilers equipped with step-modulating 
controls, EAE is defined as:

EAE = BOHR (yP PER + 
yIG PEIG + yBER) + BOHM 
(yP PEH + yIG PEIG + y 
BEH) + ESO


[[Page 53629]]


Where:

BOHR = as defined in 10.4.1.2 of this appendix
yP = as defined in 10.4.1 of this appendix
PER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3), measured at the 
reduced fuel input rate
yIG = as defined in 10.4.1 of this appendix
PEIG = as defined in 10.4.1 of this appendix
y = as defined in 10.4.1 of this appendix
BER = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
reduced fuel input rate
BOHM = as defined in 10.4.1.4 of this appendix
PEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
maximum fuel input rate
BEH = as defined in 9.1.2.2 of ANSI/ASHRAE Standard 103-
1993, (incorporated by reference, see Sec.  430.3) measured at the 
maximum fuel input rate
ESO = as defined in 10.11 of this appendix.

    10.5 Average annual electric energy consumption for electric 
furnaces or boilers.

EE = 100(2,080)(0.77)DHR/(3.412 AFUE) + ESO

Where:

100 = to express a percent as a decimal
2,080 = as specified in 10.4.1 of this appendix
0.77 = as specified in 10.4.1 of this appendix
DHR = as defined in 10.4.1 of this appendix
3.412 = conversion to express energy in terms of watt-hours instead 
of Btu
AFUE = as defined in 11.1 of ANSI/ASHRAE Standard 103-1993 
(incorporated by reference, see Sec.  430.3), in percent, and 
calculated on the basis of: ICS installation, for non-weatherized 
warm air furnaces; indoor installation, for non-weatherized boilers; 
or outdoor installation, for furnaces and boilers that are 
weatherized.
ESO = as defined in 10.11 of this appendix.

    10.6 Energy factor.
    10.6.1 Energy factor for gas or oil furnaces and boilers. 
Calculate the energy factor, EF, for gas or oil furnaces and boilers 
defined as, in percent:
[GRAPHIC] [TIFF OMITTED] TR30AU13.002

Where:

EF = average annual fuel consumption as defined in 10.4.2 
of this appendix.
EAE = as defined in 10.4.3 of this appendix.
EffyHS = Annual Fuel Utilization Efficiency as defined in 
11.2.11, 11.3.11, 11.4.11 or 11.5.11 of ANSI/ASHRAE Standard 103-
1993, in percent, and calculated on the basis of:
    ICS installation, for non-weatherized warm air furnaces;
    indoor installation, for non-weatherized boilers; or
    outdoor installation, for furnaces and boilers that are 
weatherized.
3,412 = conversion factor from kilowatt to Btu/h
    10.6.2 Energy factor for electric furnaces and boilers. The 
energy factor, EF, for electric furnaces and boilers is defined as:

EF = AFUE

Where:

AFUE = Annual Fuel Utilization Efficiency as defined in section 10.5 
of this appendix, in percent

    10.7 Average annual energy consumption for furnaces and boilers 
located in a different geographic region of the United States and in 
buildings with different design heating requirements.
    10.7.1 Average annual fuel energy consumption for gas or oil-
fueled furnaces and boilers located in a different geographic region 
of the United States and in buildings with different design heating 
requirements. For gas or oil-fueled furnaces and boilers, the 
average annual fuel energy consumption for a specific geographic 
region and a specific typical design heating requirement 
(EFR) is expressed in Btu per year and defined as:

EFR = (EF -8,760 QP)(HLH/2,080) + 
8,760 QP

Where:

EF = as defined in 10.4.2 of this appendix
8,760 = as specified in 10.4.1.1 of this appendix
QP = as defined in 11.2.11 of ANSI/ASHRAE Standard 103-
1993
HLH = heating load hours for a specific geographic region determined 
from the heating load hour map in Figure 1 of this appendix
2,080 = as defined in 10.4.1 of this appendix

    10.7.2 Average annual auxiliary electrical energy consumption 
for gas or oil-fueled furnaces and boilers located in a different 
geographic region of the United States and in buildings with 
different design heating requirements. For gas or oil-fueled 
furnaces and boilers, the average annual auxiliary electrical energy 
consumption for a specific geographic region and a specific typical 
design heating requirement (EAER) is expressed in 
kilowatt-hours and defined as:

EAER = (EAE - ESO) (HLH/2080) + 
ESOR

Where:

EAE = as defined in 10.4.3 of this appendix
ESO = as defined in 10.11 of this appendix
HLH = as defined in 10.7.1 of this appendix
2,080 = as specified in 10.4.1 of this appendix
ESOR = as specified in 10.7.3 of this appendix.

    10.7.3 Average annual electric energy consumption for electric 
furnaces and boilers located in a different geographic region of the 
United States and in buildings with different design heating 
requirements. For electric furnaces and boilers, the average annual 
electric energy consumption for a specific geographic region and a 
specific typical design heating requirement (EER) is 
expressed in kilowatt-hours and defined as:

EER = 100(0.77) DHR HLH/(3.412 AFUE) + ESOR

Where:

100 = as specified in 10.5 of this appendix
0.77 = as specified in 10.4.1 of this appendix
DHR = as defined in 10.4.1 of this appendix
HLH = as defined in 10.7.1 of this appendix
3.412 = as specified in 10.5 of this appendix
AFUE = as defined in 10.5 of this appendix
ESOR = ESO as defined in 10.11 of this 
appendix, except that in the equation for ESO, the term 
BOH is multiplied by the expression (HLH/2080) to get the 
appropriate regional accounting of standby mode and off mode loss.

    10.8 Annual energy consumption for mobile home furnaces.
    10.8.1 National average number of burner operating hours for 
mobile home furnaces (BOHSS). BOHSS is the 
same as in 10.4.1 of this appendix, except that the value of 
EffyHS in the calculation of the burner operating hours, 
BOHSS, is calculated on the basis of a direct vent unit 
with system number 9 or 10.
    10.8.2 Average annual fuel energy for mobile home furnaces 
(EF). EF is same as in 10.4.2 of this appendix 
except that the burner operating hours, BOHSS, is 
calculated as specified in 10.8.1 of this appendix.
    10.8.3 Average annual auxiliary electrical energy consumption 
for mobile home furnaces (EAE). EAE is the 
same as in 10.4.3 of this appendix, except that the burner operating 
hours, BOHSS, is calculated as specified in 10.8.1 of 
this appendix.
    10.9 Calculation of sales weighted average annual energy 
consumption for mobile home furnaces. In order to reflect the 
distribution of mobile homes to geographical regions with average 
HLHMHF value different from 2,080, adjust the annual 
fossil fuel and auxiliary electrical energy consumption values for 
mobile home furnaces using the following adjustment calculations.
    10.9.1 For mobile home furnaces, the sales weighted average 
annual fossil fuel energy consumption is expressed in Btu per year 
and defined as:

EF,MHF = (EF - 8,760 
QP)HLHMHF/2,080+8,760 QP

Where:

EF = as defined in 10.8.2 of this appendix
8,760 = as specified in 10.4.1.1 of this appendix
QP = as defined in 11.2.11 of ANSI/ASHRAE Standard 103-
1993
HLHMHF = 1880, sales weighted average heating load hours 
for mobile home furnaces
2,080 = as specified in 10.4.1 of this appendix

    10.9.2 For mobile home furnaces, the sales weighted average 
annual auxiliary electrical energy consumption is expressed in 
kilowatt-hours and defined as:

EAE,MHF = EAE HLHMHF/2,080

Where:

EAE = as defined in 10.8.3 of this appendix
HLHMHF = as defined in 10.9.1 of this appendix
2,080 = as specified in 10.4.1 of this appendix

    10.10 Direct determination of off-cycle losses for furnaces and 
boilers equipped with thermal stack dampers. [Reserved.]

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    10.11 Average annual electrical standby mode and off mode energy 
consumption. Calculate the annual electrical standby mode and off 
mode energy consumption (ESO) in kilowatt-hours, defined 
as:

ESO = ((PW,SB * (4160 - BOH)) + 
(PW,OFF * 4600)) * K

Where:

PW,SB = furnace or boiler standby mode power, in watts, 
as measured in section 8.6 of this appendix
4,160 = average heating season hours per year
PW,OFF = furnace or boiler off mode power, in watts, as 
measured in section 8.6 of this appendix
4,600 = average non-heating season hours per year
K = 0.001 kWh/Wh, conversion factor for watt-hours to kilowatt-hours
BOH = total burner operating hours as calculated in section 10.4 for 
gas or oil-fueled furnaces or boilers. Where for gas or oil-fueled 
furnaces and boilers equipped with single-stage controls, BOH = 
BOHSS ; for gas or oil-fueled furnaces and boilers 
equipped with two-stage controls, BOH = (BOHR + 
BOHH); and for gas or oil-fueled furnaces and boilers 
equipped with step-modulating controls, BOH = (BOHR + 
BOHM). For electric furnaces and boilers, BOH = 
100(2080)(0.77)DHR/(Ein 3.412)(AFUE))

Where:

100 = to express a percent as a decimal
2,080 = as specified in 10.4.1 of this appendix
0.77 = as specified in 10.4.1 of this appendix
DHR = as defined in 10.4.1 of this appendix
3.412 = conversion to express energy in terms of KBtu instead of 
kilowatt-hours
AFUE = as defined in 11.1 of ANSI/ASHRAE Standard 103-1993 
(incorporated by reference, see Sec.  430.3) in percent
Ein = Steady-state electric rated power, in kilowatts, 
from section 9.3 of ANSI/ASHRAE Standard 103-1993 (incorporated by 
reference, see Sec.  430.3).

[FR Doc. 2013-21095 Filed 8-29-13; 8:45 am]
BILLING CODE 6450-01-P