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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules
24525

=L
w-lreduced P-m,ireduced .

6
Where:
Pin_reduced = weighted average input power at reduced speeds of the circulator hp;
wi_reduced = 0.3333;
Pin,i_reduced = power input to the driver at reduced rotating speed of the circulator at each test point i hp; and i = test points, defined as 25, 50, and 75
percent of the flow at BEP of max speed and head values at or above the reference curve.

Docket No. EERE2016BTSTD0004, No. 58 Recommendation 6B and 7 at pp. 56
DOE requests comment on the CPWGrecommended test method and the unique test points, weights, and speed factors for circulator pumps distributed in commerce with manual speed controls. Specifically, DOE requests comment on whether the technology or market for such controls has changed sufficiently since the term sheet to warrant a different approach.
f. External Input Signal Control The final control variety considered by the CPWG was external input signal controls. External input signal controls are controls in which the device that responds to the stimulus, or the primary control logic, is external to the circulator pump. Unlike pressure and temperature controls, the logic that defines how the circulator pump operating speed is selected in response to some measured variable e.g., temperature, pressure, or boiler fire rate is not part of the circulator, as distributed in commerce. Instead, it is part of another control system, such as a building management system or a
p.inmax
boiler control system. Docket No.
EERE2016BTSTD0004, No. 72 at pp. 7684
For circulator pumps that have only an external input signal control, the CPWG recommended testing along the reference control curve to achieve the test point flow rates with a head at or above the reference system curve with the same weights as temperature and pressure controls. Docket No. EERE
2016BTSTD0004, No. 58
Recommendations 9 at pp. 78.
The CPWG recommended that, to ensure the rating would be representative of the performance of such pumps, the external input signal control must be the only control mode on the pump, and the pump must not be able to operate without an external input signal. Docket No. EERE2016
BTSTD0004, No. 58
Recommendations 9 at pp. 78
The CPWG asserted that if external input signal control is one of multiple options available on a circulator pump, or the pump is able to operate without an external input signal, it is less likely that the external input signal control option would be utilized in the field.
Docket No. EERE2016BTSTD0004, No. 72 at pp. 217218. Therefore, to prevent the possibility of artificially improving the PEICIRC rating through the addition of an external input signal control mode, the CPWG recommended testing circulator pumps with external input signal controls similar to manual speed controls. Docket No. EERE
2016BTSTD0004, No. 47 at p. 480
The CPWG recommended testing a circulator pump sold with external
input signal controls and another control variety with a simulated signal both: 1 Along the maximum speed circulator pump curve to achieve the test point flow rates for the maximum speed input power values, and 2 with speed adjustment using a simulated signal to the lowest speed setting that will achieve a head at or above the reference curve at the test point flow rates for the reduced speed input power values. Docket No. EERE2016BT
STD0004, No. 58 Recommendation 9
at pp. 78
As such, the CPWG recommended that for circulator pumps distributed in commerce with external input signal controls and at least one other control variety, the PERCIRC should be calculated as the weighted average of Pin,max the weighted average input power at specific load points across the maximum speed curve and Pin,reduced the weighted average input power at specific load points at reduced speed, similar to circulator pumps with manual speed control, but with a different speed factor, as shown in equations 7, 8, and 9:
PERCIRC = zmaxPinmax + zreduced Pinreduced Where:
PERCIRC = circulator pump energy rating hp;
zmax = speed factor weight of 0.30;
Pin_max = weighted average input power at maximum rotating speed of the circulator pump hp;
zreduced = speed factor weight of 0.70; and Pin_reduced = weighted average input power at reduced rotating speed of the circulator hp.

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w-lmax P-m,imax .
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wi_max = 0.25;
Pin,i_max = power input to the driver at maximum rotating speed of the circulator at each test point i hp; and
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i = test points, defined as 25, 50, 75, and 100 percent of the flow at BEP.

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EP07MY21.004 EP07MY21.005

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