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Federal Register / Vol. 86, No. 241 / Monday, December 20, 2021 / Proposed Rules
VerDate Sep<11>2014

18:33 Dec 17, 2021

Jkt 256001

p . . = HR,i QR,i p .
mi HT,j QT,j 1
Where:
Pin,i = 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:

CER

=

L luiPin,a i
Where:
CER = circulator energy rating hp;

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Fmt 4701

Sfmt 4702

p in,i
= QR,ip QT,j T,j
Where:
Pin,i = the driver power input hp;
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.
B.1.3 For tested head values within 10
percent of 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:

p . . = HR,i QR,i p .
mi H T,j QT,j TJ
Where:
Pin,i = 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.
B.1.4 If the tested head value is below the head load point specified by the reference system curve by more than 10 percent, the test point must be retested.

E:FRFM20DEP2.SGM

20DEP2

EP20DE21.039

Where:
Pin,i = the driver power input hp;
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.
B.1.5 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:

EP20DE21.038

= QR,ip QT,j T,j
V. Testing and Calculation of CER for Circulator Pumps With Temperature Controls A. Scope.
A.1 This section V applies only to circulator pumps sold with temperature controls.
B. Determination of circulator pump driver power input.
B.1 Adjust the speed of the pump using a manual speed adjustment or a simulated temperature signal to activate the temperature control to achieve flow rates of 25, 50, 75, and 100 percent of the BEP flow rate as determined according to section I.E.2
of this appendix with head values that are at or above the reference system curve defined in section I.E.3 of this appendix.
Measure the driver power input at those flow rates.
B.1.1 All tested flow values must be within 5 percent of the target flow load points as specified by the reference system curve.
B.1.2 For tested head values that are more than 10 percent above the reference system curve, adjust the tested driver power input to the specified flow point using the following equation:

EP20DE21.037

p in,i
wi = weight of 0.05, 0.40, 0.40, and 0.15 at test points of 25, 50, 75, and 100 percent of BEP flow, respectively;
Pin,i = driver power input at each test point i hp; and i = test points corresponding to 25, 50, 75, and 100 percent of BEP flow.

EP20DE21.036

IV. Testing and Calculation of CER for Circulator Pumps With Pressure Controls A. Scope.
A.1 This section IV applies only to circulator pumps sold with pressure controls, including adaptive pressure controls.
B. Determination of circulator pump driver power input.
B.1 Determine the driver power input at 25, 50, 75, and 100 percent of the BEP flow rate as determined according to section I.E.2
of this appendix by measuring the driver power input at those flow rates with the following additional requirements.
B.1.1 For pressure controls that are not adaptive pressure controls, select the control settings according to section B.1.1.1 of this appendix, and evaluate the load points at 25, 50, and 75 percent of BEP flow using one of the methods specified in section B.1.1.2 of this appendix.
B.1.1.1 If the minimum and/or maximum head values on the control curve can be adjusted, adjust the maximum head value to 100 percent of BEP head at maximum speed and the minimum head value to 20 percent of BEP head at maximum speed. If the maximum head values on the control curve cannot be adjusted, select a control curve that meets the following requirements:
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.1.1.2 Adjust the speed of the pump at flow rates of 25, 50, and 75 percent of BEP
flow using one of the methods specified in sections B.1.1.3.1 through B.1.1.3.3 of this appendix. Only one control setting may be evaluated.
B.1.1.2.1 Throttle the pump to the desired flow rate and allow the selected pressure control to automatically reduce the speed according to the control curve for the control setting being evaluated.
B.1.1.2.2 Manually adjust the speed of the pump and throttle the pump as needed to achieve speed settings equivalent to those that would be generated by the control setting being evaluated.
B.1.1.2.3 Provide a simulated pressure signal and throttle the pump as needed to achieve speed settings equivalent to those that would be generated by the control setting being evaluated.
B.1.2 For pressure controls that are adaptive pressure controls, select the control settings and adjust the speed of the pump
according to section B.1.2.1 or B.1.2.2 of this appendix. Adaptive pressure controls may be manually adjusted to achieve 100 percent BEP flow and head point at max speed.
B.1.2.1 If the pump can be manually controlled, adjust the speed manually to achieve the load point flow rates with head values at or above the greater of the reference system curve and the minimum thresholds for head specified in the manufacturer literature.
B.1.2.2 If the pump does not have a manual control mode available, adjust the speed based on the pressure control mode with the lowest head at each load point. If the selected pressure control mode results in a head value below the reference system curve, the pump may be throttled to achieve a head value at or above the reference system curve.
B.1.3 All tested flow values must be within 5 percent of the target flow load points as specified by the reference system curve equation in section I.E.3 of this appendix.
B.1.4 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:

EP20DE21.035

khammond on DSKJM1Z7X2PROD with PROPOSALS2

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 III.B.2 of this appendix; and i = test points corresponding to 25, 50, and 75 percent of the flow at BEP and reduced speed.

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