CODES & STANDARDS

ASHRAE
Proposed American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 188P, Prevention of Legionellosis Associated With Building Water Systems, is undergoing a second public review, which will end July 25.

Legionellosis is a form of pneumonia caused by the bacterium Legionella. It takes two forms: Legionnaires' disease and the less-severe Pontiac fever.

"We know how to analyze and control this hazard," Bill McCoy, chair of the Standard 188P committee, said. "We need a standardized practice to specify for facility managers/owners (to know) exactly what to do in their facilities to control the hazard in a systematic and scientifically defensible way."

Following Standard 188P's first public review in November 2010, Section 8.1, which covers potable water, was rewritten. Design-oriented specifications were eliminated because 188P is intended to be a practices, rather than design, standard.

Standard 188P differs from ASHRAE Guideline 12, Minimizing the Risk of Legionellosis Associated With Building Water Systems, in that while the guideline gives recommendations concerning the treatment of various building water systems, the standard specifies exactly what must be done.

"The standard and the guideline are, therefore, complementary," McCoy said.

For more information and to comment on Standard 188P, visit www.ashrae.org/publicreviews. For more on the prevention of legionellosis, read "Preventing Legionnaires’ Disease in Cooling Towers" by Frank Rosa in the July 2011 issue of HPAC Engineering.

ASHRAE also recently announced that nine proposed addenda to ANSI/ASHRAE/IES Standard 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings, are open for public review until July 25. They include:

• Addendum a, which updates the test-procedure references in the tables in Section 10.8 (product information) and adds a normative reference to Chapter 12.
• Addendum cj, which changes the requirements for economizers and the modeling of economizers in computer rooms in Appendix G (Performance Rating Method).
• Addendum m, which adds power-density and control requirements, adds an exemption, and limits control credits to lamps in multilamp fixtures.
• Addendum q, which updates ASHRAE’s dynamic-glazing definition to match the National Fenestration Rating Council’s.
• Addendum r, which clarifies the intent of the committee and relocates all wording related to thermostat and humidity schedules to the schedules section of Table G3.1.
• Addendum v, which requires that controlled receptacles be identified so that they are clearly distinguishable from non-controlled ones.
• Addendum w, which clarifies the renewable-energy and purchased-energy credits in Section 11 (Energy Cost Budget Method) and Appendix G (Performance Rating Method).

For more information, visit www.ashrae.org/publicreviews.