Federal Register - December 10, 2021
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Source: Federal Register
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Federal Register / Vol. 86, No. 235 / Friday, December 10, 2021 / Proposed Rules
measurement interval when determining CPi,adj .
CPi,STI = The position of critical parameter i as certified in the STI. If multiple components corresponding to a single parameter are present, calculate the average position across all components
corresponding to that parameter at each measurement interval when determining CPi,STI .
CPMax = The maximum operating position for Critical Parameter i, as certified in the STI for the 100% load condition. If multiple components corresponding to a
single parameter are present, calculate as the average value across all components corresponding to that critical parameter certified in the STI for the 100% load condition.
Next, use equation 5.22 to determine the accrued points for each critical parameter:
Where:
i identifies the critical parametereither compressors speeds, outdoor fan speeds, or outdoor variable valve positions NPVi = the nominal point value for critical parameter i, as follows:
TABLE 5.1CRITICAL PARAMETER
NOMINAL POINT VALUES
Finally, use equation 5.23 to calculate the root-sum-squared RSS Points Total across all critical parameters.
5.2.2 Critical Parameter Adjustments for Meeting SHR Limits. The SHR for the 100%
load test point and the 75% part-load test point must not be higher than 0.82 and 0.85, respectively measured to the nearest hundredth. If the SHR is above the allowable limit, increase the compressor speeds until either the SHR is less than or equal to the allowable limit or the cooling capacity reaches 3% greater than the target cooling capacity for that test, whichever happens first. If multiple compressors are present in
Nominal point value
Critical parameter Compressor Speeds
Outdoor Fan Speeds
Outdoor Variable Valve positions
13
7
1
the system, increase compressor speed by the same absolute increment for each compressor for which the following conditions apply:
1 The STI specifies a non-zero compressor speed for the compressor for that test and 2 The compressor has not yet reached maximum speed. Upwards adjustments to compressor speed are not constrained by a budget on RSS Points Total. Should the SHR
remain above the maximum limit when the cooling capacity reaches its upper 3%
tolerance, no further compressor adjustments must be made, and the calculation procedures specified in Section 11.2.2.2 of AHRI 12302021 must be applied using the adjusted SHR value obtained after increasing the compressor speeds.
6. Set-Up and Test Provisions for Specific Components. When testing a VRF multi-split system that includes any of the specific components listed in Table 6.1, test in accordance with the set-up and test provisions specified in Table 6.1.
TABLE 6.1TEST PROVISIONS FOR SPECIFIC COMPONENTS
jspears on DSK121TN23PROD with PROPOSALS2
Air Economizers
Test provisions
An assembly that reduces the moisture content of the supply air through moisture transfer with solid or liquid desiccants.
An automatic system that enables a cooling system to supply outdoor air to reduce or eliminate the need for mechanical cooling during mid or cold weather.
Disable desiccant dehumidification components for testing.
Fresh Air Dampers
An assembly with dampers and means to set the damper position in a closed and one open position to allow air to be drawn into the equipment when the indoor fan is operating.
Hail Guards
A grille or similar structure mounted to the outside of the unit covering the outdoor coil to protect the coil from hail, flying debris and damage from large objects.
An assembly with dampers and means to set the dampers in a position to recirculate the warmer condenser discharge air to allow for reliable operation at low outdoor ambient conditions.
A capacitor that increases the power factor measured at the line connection to the equipment. These devices are a requirement of the power distribution system supplying the unit.
Low Ambient Cooling Dampers.
Power Correction Capacitors
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For any air economizer that is factory-installed, place the economizer in the 100% return position and close and seal the outside air dampers for testing. For any modular air economizer shipped with the unit but not factory-installed, do not install the economizer for testing.
For any fresh air dampers that are factory-installed, close and seal the dampers for testing. For any modular fresh air dampers shipped with the unit but not factory-installed, do not install the dampers for testing.
Remove hail guards for testing.
Remove low ambient cooling dampers for testing.
Remove power correction capacitors for testing.
E:FRFM10DEP2.SGM
10DEP2
EP10DE21.012
Desiccant Dehumidification Components.
Description
EP10DE21.011
Component
