(Effective until July 1, 2020)

PDFWAC 51-11C-40347

Section C403.4.6—Hot gas bypass limitation.

C403.4.6 Hot gas bypass limitation. Cooling systems shall not use hot gas bypass or other evaporator pressure control systems unless the system is designed with multiple steps of unloading or continuous capacity modulation. The capacity of the hot gas bypass shall be limited as indicated in Table C403.4.6, as limited by Section C403.3.1.
Table C403.4.6
Maximum Hot Gas Bypass Capacity
Rated Capacity
Maximum Hot Gas Bypass Capacity (% of total capacity)
≤ 240,000 Btu/h
50
˃ 240,000 Btu/h
25
For SI:
1 British thermal unit per hour = 0.2931 W.
[Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40347, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40347, filed 2/1/13, effective 7/1/13.]
(Effective July 1, 2020)

PDFWAC 51-11C-40347

Section C403.4.7—Combustion heating equipment controls.

C403.4.7 Combustion heating equipment controls. Combustion heating equipment with a capacity over 225,000 Btu/h shall have modulating or staged combustion control.
EXCEPTIONS:
1. Boilers.
 
2. Radiant heaters.
C403.4.7.1 Combustion decorative vented appliance, combustion fireplace and fire pit controls. Combustion decorative vented appliances, combustion fireplaces and fire pits shall be equipped with local controls to limit operation to a maximum duration of one hour without override hold capability or shall be controlled by occupancy sensor control configured with manual on and automatic shutoff within 15 minutes after occupants have left the space.
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapter 19.27 RCW. WSR 19-24-040, § 51-11C-40347, filed 11/26/19, effective 7/1/20. Statutory Authority: RCW 19.27A.025, 19.27A.045, 19.27A.160, and 19.27.074. WSR 17-10-062, § 51-11C-40347, filed 5/2/17, effective 6/2/17. Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-40347, filed 2/1/13, effective 7/1/13.]