RATING CAPACITY | MINIMUM NUMBER OF MECHANICAL COOLING STAGES | MINIMUM COMPRESSOR DISPLACEMENTa |
≥ 65,000 Btu/h and < 240,000 Btu/h | 3 stages | ≤ 35% of full load |
≥ 240,000 Btu/h | 4 stages | ≤ 25% full load |
For SI: | 1 British thermal unit per hour = 0.2931 W. |
| a For mechanical cooling stage control that does not use variable compressor displacement, the percent displacement shall be equivalent to the mechanical cooling capacity reduction evaluated at the full load rating conditions for the compressor. |
[Statutory Authority: RCW
19.27A.025,
19.27A.160, and
19.27.074. WSR 16-03-072, § 51-11C-40331, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW
19.27A.025,
19.27A.045,
19.27.020, and
19.27.074. WSR 14-24-122, § 51-11C-40331, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW
19.27A.020,
19.27A.025 and chapters
19.27 and
34.05 RCW. WSR 13-04-056, § 51-11C-40331, filed 2/1/13, effective 7/1/13.]
(Effective July 1, 2020)
Section C403.3.1—Equipment and system sizing.
C403.3.1 Equipment and system sizing. The output capacity of heating and cooling equipment shall be not greater than that of the smallest available equipment size that exceeds the loads calculated in accordance with Section C403.1.2. A single piece of equipment providing both heating and cooling shall satisfy this provision for one function with the capacity for the other function as small as possible, within available equipment options.
EXCEPTIONS: | 1. Required standby equipment and systems provided with controls and devices that allow such systems or equipment to operate automatically only when the primary equipment is not operating. |
| 2. Multiple units of the same equipment type with combined capacities exceeding the design load and provided with controls that are configured to sequence the operation of each unit based on load. |
[Statutory Authority: RCW
19.27A.020,
19.27A.025,
19.27A.160 and chapter
19.27 RCW. WSR 19-24-040, § 51-11C-40331, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW
19.27A.025,
19.27A.160, and
19.27.074. WSR 16-03-072, § 51-11C-40331, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW
19.27A.025,
19.27A.045,
19.27.020, and
19.27.074. WSR 14-24-122, § 51-11C-40331, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW
19.27A.020,
19.27A.025 and chapters
19.27 and
34.05 RCW. WSR 13-04-056, § 51-11C-40331, filed 2/1/13, effective 7/1/13.]