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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules
i = test points, defined as 25, 50, 75, and 100 percent of the flow at BEP.

Docket No. EERE2016BTSTD0004, No. 58 Recommendations 6A at pp. 4
5 and 7 at p.6
The CPWG recommended testing circulator pumps with pressure controls using automatic speed adjustment based on the factory selected control setting, manual speed adjustment, or simulated pressure signal to trace a factory selected control curve setting that will achieve the test point flow rates with a head at or above the reference system curve. The CPWG also recommended that if a circulator pump with pressure controls is tested with automatic speed adjustment, that the pump can be manually adjusted to achieve 100
percent BEP flow and head point at maximum speed. Finally, for circulator pumps with adaptive pressure controls, the CPWG recommended that testing be conducted at the minimum thresholds for head based on manufacturer literature and through manual speed adjustment to achieve the test point flow rates with head values at or above the reference curve. Docket No. EERE
2016BTSTD0004, No. 58
Recommendation 9 at p. 7
DOE requests comment on the recommended test methods, test points, and weights for circulator pumps with pressure controls, including circulator pumps with adaptive pressure 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.
d. Temperature Control Temperature controls are controls that automatically adjust the speed of the variable speed drive in the pump continuously over the operating speed range to respond to a change in temperature of the operating fluid in the system. Typically, temperature controls are designed to achieve a fixed temperature differential between the supply and return lines and adjust the
p.inmax
flow rate through the system by adjusting the speed to achieve the specified temperature differential.
Similar to pressure controls, temperature controls are also designed primarily for hydronic heating applications. However, temperature controls may be installed in singleor multi-zone systems and will optimize the circulator pumps operating speed to provide the necessary flow rate based on the heat load in each zone. As there are no minimum head requirements inherent to the circulator pump control, temperature controls may have potential to use less energy than pressure-based controls to serve a given load.
The CPWG recommended that for circulator pumps distributed in commerce with temperature controls, that PERCIRC should be calculated the same way and with the same weights as for pressure controls, as shown in Equation 3. Docket No. EERE2016
BTSTD0004, No. 58
Recommendations 6A at pp. 45 and 7 at p. 6 The CPWG also recommended that circulator pumps with temperature controls be tested based on manual speed adjustment or with a simulated temperature signal to activate the temperature-based control to achieve the test point flow rates with a head at or above the reference curve.
Docket No. EERE2016BTSTD0004, No. 58 Recommendation 9 at p. 7
DOE requests comment on the recommended test methods, test points, and weights for circulator pumps with temperature 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.
e. Manual Speed Control Manual speed controls are controls in which the speed of the pump is adjusted manually, typically to one of several pre-set speeds, by a dial or a control panel to fit the demand of the system within which it is installed. The CPWG
discussed how circulator pumps
w-

=L

imax
installed with manual speed controls are typically only adjusted one time upon installation, if at all, and will operate at that set speed as if it were a single-speed circulator pump. That is, many manual speed control circulator pumps operate at full speed, while a portion of them may be set to a medium or low speed to suit the needs of the systems. Docket No. EERE2016BT
STD0004, No. 65 at pp. 131133
Therefore, the CPWG recommended to test circulator pumps with manual speed controls 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 based on manual speed adjustment to the lowest speed setting that will achieve a head at or above the reference curve at the test point flow rate for the reduced speed input power values. Docket No. EERE2016BT
STD0004, No. 58 Recommendation 9
at p. 7
To accomplish a single rating representative of the average energy use of a manual speed circulator, the CPWG recommended that for circulator pumps distributed in commerce with manual speed controls, 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, but recommended separate load points and speed factors, as shown in equations 4, 5, and 6:
PERCIRC = zmaxPinmax + zreduced Pinreduced Where:
PERCIRC = circulator pump energy rating hp;
zmax = speed factor weight of 0.75;
Pin_max = weighted average input power at maximum rotating speed of the circulator hp, as specified in equation 5;
zreduced = speed factor weight of 0.25; and Pin_reduced = weighted average input power at reduced rotating speed of the circulator hp, as specified in equation 6.

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