Purpose: The state Building Code Council has adopted an emergency rule modification to section 1423 when it was determined that language adopted previously would cause undue expense for residential systems. This rule adopts that language as a permanent rule.

     Citation of Existing Rules Affected by this Order: Amending WAC 51-11-1423.

     Statutory Authority for Adoption: RCW 19.27A.025 and 19.27A.045.

     Other Authority: Chapters 19.27, 19.27A and 34.05 RCW.

      Adopted under notice filed as WSR 05-17-011 on August 4, 2005.

     Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.

     Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, Amended 0, Repealed 0.

     Number of Sections Adopted on the Agency's Own Initiative: New 0, Amended 1, Repealed 0.

     Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 0, Repealed 0.

     Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0;      Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 0, Amended 1, Repealed 0.

     Date Adopted: November 4, 2005.

John P. Neff

Council Chair

OTS-8152.1

AMENDATORY SECTION(Amending WSR 05-01-013, filed 12/2/04, effective 7/1/05)

WAC 51-11-1423   Economizers.   Economizers meeting the requirements of Section 1413 shall be installed on:

     a. Cooling units installed outdoors or in a mechanical room adjacent to outdoors having a total cooling capacity greater than 20,000 Btu/h including those serving computer server rooms, electronic equipment, radio equipment, telephone switchgear; and

     b. Other cooling units with a total cooling capacity greater than 54,000 Btu/h, including those serving computer server rooms, electronic equipment, radio equipment, and telephone switchgear.

Exception:

For Group R Occupancy, economizers meeting the requirements of Section 1413 shall be installed on single package unitary fan-cooling units having a total cooling capacity greater than 54,000 Btu/h.

     The total capacity of all units without economizers (i.e., those units with a total cooling capacity less than a. and b. above) shall not exceed 240,000 Btu/h per building, or 10% of its aggregate cooling (economizer) capacity, whichever is greater. That portion of the equipment serving Group R Occupancy is not included in determining the total capacity of all units without economizers in a building.

[Statutory Authority: RCW 19.27A.025, 19.27A.045 and chapters 19.27, 19.27A, and 34.05 RCW. 05-01-013, § 51-11-1423, filed 12/2/04, effective 7/1/05. Statutory Authority: RCW 19.27A.025, 19.27A.045. 02-01-112, § 51-11-1423, filed 12/18/01, effective 7/1/02; 01-03-010, § 51-11-1423, filed 1/5/01, effective 7/1/01; 98-03-003, § 51-11-1423, filed 1/8/98, effective 7/1/98. Statutory Authority: RCW 19.27A.025. 93-21-052, § 51-11-1423, filed 10/18/93, effective 4/1/94.]