ASHRAE-90.1-2022- - Page 108
Extracted Content
6.7.3.1 Record Documents. Construction documents shall require that, within 90 days after the date of system acceptance, record documents be provided to the building owner or the designated representative of the building owner. Record documents shall include, as a minimum, the location and performance data on each piece of equipment ; general configuration of the duct and pipe distribution system, including sizes; and the terminal air or water design flow rates.
6.7.3.2 Manuals. Construction documents shall require that an operating manual and a maintenance manual be provided to the building owner or the designated representative of the building owner within 90 days after the date of system acceptance. These manuals shall be in accordance with industry-accepted standards (see Informative Appendix E) and shall include, at a minimum, the following:
a. Submittal data stating equipment size and selected options for each piece of equipment requiring mainte nance. b. Operation manuals and maintenance manuals for each piece of equipment and system requiring mainte nance, except equipment not furnished as part of the project. Required routine maintenance actions shall be clearly identified. c. Names and addresses of at least one service agency . d. HVAC controls system maintenance and calibration information, including wiring diagrams, schematics,
and control sequence descriptions. Desired or field-determined set points shall be permanently recorded on control drawings at control devices or, for digital control systems, in programming comments. e. A complete narrative of how each system is intended to operate, including suggested set points .
6.7.3.3 System Balancing 6.7.3.3.1 General. Construction documents shall require that all HVAC systems be balanced in accordance with generally accepted engineering standards (see Informative Appendix E). Construction docu- ments shall require that a written balance report be provided to the building owner or the designated representative of the building owner for HVAC systems serving zones with a total conditioned area exceeding 5000 ft [2] .
6.7.3.3.2 Air System Balancing. Air systems shall be balanced in a manner to first minimize throttling losses. Then, for fans with fan system power greater than 1 hp, fan speed shall be adjusted to meet design flow conditions.
6.7.3.3.3 Hydronic System Balancing. Hydronic systems shall be proportionately balanced in a manner to first minimize throttling losses; then the pump impeller shall be trimmed or pump speed shall be adjusted to meet design flow conditions.
Exceptions to 6.7.3.3.3: Impellers need not be trimmed nor pump speed adjusted
- for pumps with pump motors of 10 hp or less or
- when throttling results in no greater than 5% of the nameplate horsepower draw, or 3 hp, whichever is greater, above that required if the impeller was trimmed.
6.8 Minimum Equipment Efficiency Tables 6.8.1 Minimum Efficiency Requirement Listed Equipment— Standard Rating and Operating Conditions
6.8.2 Duct Insulation Tables 6.8.3 Piping Insulation Tables. Hot-water heating, steam heating, and steam condensate piping shall be insulated to the minimum thickness required in Tables 6.8.3-1 and 6.8.3-2 and shall either utilize insulation within the thermal conductivity ranges in the tables, or, when the insulation thermal conductivity is not within the range in the tables, the following equation shall be used to calculate the minimum insulation thickness:
t alt = r [(1 + ttable / r ) × kalt / kupper - 1]
where talt = minimum insulation thickness of the alternate material, in. r = actual outside radius of pipe, in. ttable = insulation thickness listed in Table 6.8.3-1 or Table 6.8.3-2 for applicable fluid temperature and pipe size kalt = thermal conductivity of the alternate material at mean rating temperature indicated for the applicable fluid temperature, Btu·in/h·ft [2] ·°F kupper = upper value of the thermal conductivity range listed in this table for the applicable fluid temperature, Btu·in/h·ft [2] ·°F Exception to 6.8.3: For nonmetallic piping thicker than Schedule 80 and having thermal resistance
greater than that of steel pipe, reduced insulation thicknesses are permitted if documentation is pro
106 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)