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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules recommended that DOE establish different test methods for each control variety in the circulator pump test procedure in order to best represent the different energy use patterns exhibited by each control variety. Docket No.
EERE2016BTSTD0004, No. 58, Recommendation 9 at p. 7
a. Control Definitions The CPWG recommended definitions for the following control varieties for circulator pumps: manual speed control, pressure control, temperature control, and external input signal control. The definitions of these pump control varieties recommended by the CPWG
are as follows:
Manual speed control means a control variable speed drive and user interface that adjusts the speed of a driver based on manual user input.
Pressure control means a control variable speed drive and integrated logic that automatically adjusts the speed of the driver in response to pressure.
Temperature control means a control variable speed drive and integrated logic that automatically adjusts the speed of the driver continuously over the driver operating speed range in response to temperature.
External input signal control means a variable speed drive that adjusts the speed of the driver in response to an input signal from an external logic and/or user interface.

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Docket No. EERE2016BTSTD0004, No. 58, Recommendation 4 at p. 4
The CPWG did not recommend a definition for adaptive pressure controls, although it did recommend a separate test procedure for them, because, as discussed by the CPWG, adaptive pressure controls are able to adjust the slope of the control curve to fit the system needs through an ongoing learning process inherent in the software. Docket No. EERE2016BT
STD0004, No. 72 at pp. 4546 The test procedure for circulator pumps with adaptive pressure controls is discussed further in section II.C.1.c.
DOE requests comment on the recommended definitions for manual speed control, pressure control, adaptive pressure control, temperature control, and external input signal control. Additionally, DOE requests comment on a possible definition for adaptive pressure control.
DOE requests comment on whether any additional control variety is now currently on the market and if it should be considered in this rulemaking.
b. Reference Curve All recommended test methods for circulator control varieties, which involve variable speed control of the circulator pump, specify test points
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with respect to a representative system curve. That is, for circulator pumps with manual speed controls, pressure controls, temperature controls, or external input signal controls, a reference system curve is implemented to be representative of the speed reduction that is possible in a typical system to provide representative results.
For circulator pumps with no controls, no reference system is required as measurements are taken at various test points along a pump curve at maximum speed only.
Such a reference system curve describes the relationship between the head and the flow at each test point in a typical system. Additionally, a reference system curve that is representative of a typical system in which circulator pumps are installed may also allow for the differentiation of control varieties to be reflected in the resulting ratings. The CPWG
recommended that DOE incorporate the same reference system curve that is used in the January 2016 TP final rule.
Docket No. EERE2016BTSTD0004, No. 58 Recommendations 8 at pp. 6
7 This curve is a quadratic reference system curve, which intersects the BEP
and has a static offset of 20 percent of BEP head, as shown in equation 2:

2

= o.8 -Q-
+ 0.2 H100%
Q100%
2

Where:
H = the pump total head ft, Q = the flow rate gpm, Q100% = flow rate at 100 percent of BEP flow gpm, and H100% = pump total head at 100 percent of BEP flow ft.

Docket No. EERE2016BTSTD0004, No. 58 Recommendations 8 at pp. 6
7

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DOE requests comment on whether the CPWG-recommended reference system curve shape, including the static offset, is reasonable for circulator pumps.
c. Pressure Control Pressure controls are a variety of circulator pump controls in which the variable speed drive is automatically adjusted based on the pressure in the system. For example, such controls are
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common in multi-zone hydronic heating applications in which the flow and speed are adjusted in response to zones opening or closing. The CPWG
recommended that for all circulator pumps distributed in commerce with pressure controls, the PERCIRC should be calculated as the weighted average input power at 25, 50, 75, and 100 percent of BEP flow, with unique weights shown in equation 3:

L wiPin,i 3

Where:
PERCIRC = circulator pump energy rating hp;

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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;

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Pin,i = power input to the driver at each test point i hp; and
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