ASHRAE_Guideline_0-2019_ - Page 055
Extracted Content
# New Construction Checklists Overall Sample Rate Component Sample Rate
1 through 10 100% 70% to 100%
11 through 20 80% 50% to 70%
21 through 50 50% 30% to 50%
51 through 100 30% 15% to 30%
100 2% to 20% 2% to 10%
missed. Because the sampling rate is lower for these than for other components, you can compare results between similar components more easily.
- Accomplish Verification. For the chosen sample, compare the completed construction checklist to the actual installation. Pay particular attention to common items in the OPR, such as accessibility, maintainability and future installation steps. Also, verify the record drawings with the actual installation.
b. Cx Tests. The preparation for the Cx tests includes all of
the activities completed during Predesign Phase, Design Phase, and Construction Phase, including design reviews, submittal reviews, construction checklist verifications, and verification of contractor completed tests and system start-up. Therefore, the role of the Cx tests is to provide
the final report card for the project, with the expectation of receiving an A+.
This process approach then uses sampling to better evaluate achievement of the OPR, as the sampling allows for more in-depth testing as well as analysis of the results.
The same sampling approach used for construction checklists can be used for Cx tests. The difference is that instead of using completed construction checklists as the sampling group, the focus of the test is the selection group. For example, the following are potential selection groups for their OPR:
- Comfort. The individual rooms/spaces in the building.
- Exterior Enclosure. The individual components or assembly types, or each interface between components/assemblies.
- Energy. Energy-using components.
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