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72142

Federal Register / Vol. 86, No. 241 / Monday, December 20, 2021 / Proposed Rules
Pin_reduced = weighted average input power at reduced rotating speeds of the circulator pump hp, calculated in accordance with section II.C.2.2 of this appendix.
C.2.1 Determine the weighted average input power at maximum speed using the following equation:

Pinmax
=

L

uimax Pin,imax
i
Where:
Pin_max = weighted average input power at maximum speed of the circulator pump hp;
wi_max = 0.25;
Pin,i_max = driver power input at maximum rotating speed of the circulator pump at
p.lnreduced
W

=L

lreduced
each test point i hp determined in accordance with section II.C.1.1 of this appendix; and i = test points corresponding to 25, 50, 75, and 100 percent of the flow at BEP and maximum speed.
C.2.2 Determine the weighted average input power at reduced speeds of the circulator pump using the following equation:

Pin,lreduced

i
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C.1 Determine the weighted average input power at maximum speed using the following equation:

p.lnmax
= L

w.lmax Pin,lmax .

i Where:
Pin_max = weighted average input power at maximum speed of the circulator pump hp;
wi_max = 0.25;

W

=L

lreduced
Pin,i_max = driver power input at maximum rotating speed of the circulator pump at each test point i hp determined in accordance with section III.B.1; and i = test points corresponding to 25, 50, 75, and 100 percent of the flow at BEP and maximum speed.
C.2 Determine the weighted average input power at reduced speeds of the circulator pump using the following equation:

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Fmt 4701

Pin,lreduced

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E:FRFM20DEP2.SGM

EP20DE21.034

T,J

EP20DE21.033

.
T,J

Where:
Pin,i_reduced = the driver power input hp;
HR,i = the specified head at load point i based on the reference system curve ft;
HT,j = the tested head at load point j ft;
QR,i = the specified flow rate at load point i based on the reference system curve gpm;
QT,j = the tested flow rate at load point j gpm; and PT,j = the tested driver power input at load point j hp.
C. Calculating the circulator energy rating.
Determine the CER of each tested circulator pump using the following equation:

i
18:33 Dec 17, 2021

Q

= ZmaxPinmax + ZreducedPinre duce d
p.lnreduced
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.
T,J

EP20DE21.032

T,l
Where:
Pin,i_reduced = the driver power input hp;
QR,i = the specified flow rate at load point i based on the reference system curve gpm;

CER
Where:
CER = circulator energy rating hp;
zmax = speed factor weight of 0.75;
Pin_max = weighted average input power at maximum rotating speed of the circulator pump hp, calculated in accordance with section III.C.1 of this appendix;
zreduced = speed factor weight of 0.25;
Pin_reduced = weighted average input power at reduced rotating speeds of the circulator pump hp, calculated in accordance with section III.C.2 of this appendix.

p .

H

EP20DE21.031

-QR,i m,lreduced QT,j
m,lreduced -

EP20DE21.030

p. .

- HR,i QR,i F .

p. .

EP20DE21.029

III. Testing and Calculation of CER for Circulator Pumps With Manual Speed Controls A. Scope.
A.1 This section III applies only to circulator pumps sold with manual speed controls.
B. Determination of circulator pump driver power input.
B.1 Determine the driver power input at 25, 50, and 75 percent of the measured BEP
flow rate at maximum speed as determined according to section I.E.2 of this appendix of the tested circulator pump in accordance with Appendix E of HI 40.62021.
B.2 Determine the driver power input at 100 percent of BEP flow at maximum speed
QT,j = the tested flow rate at load point j gpm; and PT,i = the tested driver power input at load point i hp.
B.2.4 For tested head values that are below the head load points specified by the reference system curve, adjust the tested driver power input to the specified flow and head point using the following equation:

20DEP2

EP20DE21.028

and at 25, 50, and 75 percent of the BEP flow rate at reduced speed by manually setting the speed of the circulator pump and measuring the driver power input at those flow rates with the following additional requirements:
B.2.1 The tested control curve must:
1 Be available to the end-user, 2 Produce a head equal to or greater than 25 percent of BEP head at a minimum of one test point, and 3 Achieve 100 percent BEP flow of the reference system curve defined in section I.E.3 of this appendix.
B.2.2 All tested flow values must be within 5 percent of the target flow load points as specified by the reference system curve.
B.2.3 For tested head values that are at or above the head load points specified by the reference system curve, adjust the tested driver power input to the specified flow point using the following equation:

Where:
Pin_reduced = weighted average input power at reduced speeds of the circulator pump hp;
wi_reduced = 0.3333;
Pin,i_reduced = driver power input at reduced rotating speed of the circulator pump at each test point i hp determined in accordance with section II.C.1.2 of this appendix; and i = test points corresponding to 25, 50, and 75 percent of the flow at BEP with head at or above the reference system curve.