Fault Detection and Diagnostics for Rooftop Air Conditioners

• Temperature and humidity levels for the ambient air, mixed air, supply air and the
conditioned space.
The following is a general outline of the data gathering and test plan.
SCHOOLS:
March – May 2001: Monitor building performance for each of the four schoolrooms.
Use this data to build baseline data for each room.
May – June, 2001: For the remaining part of this school year, set up one building at each
site to run in Demand Controlled Ventilation (DCV) mode and the other building with the
standard economizer mode. During this time visit each room and characterize the
nominal usage patterns, etc.
Summer, 2001 (June-August): If the rooms are not to be occupied regularly during the
summer months when regular school is not in session (mid-June to early September),
then set up each room to operate in one common mode. Since the units at both school
sites were setup for fixed outdoor air ventilation rates originally, we will duplicate that
situation with the same percentage of outdoor air for each room. This will allow for a full
characterization of the building thermal performance and any baseline differences
between rooms at each site.
Fall, 2001: Around the beginning of the new school year, the control strategy will be
changed to include one building on DCV and the other on a fixed ventilation rate. The
fixed ventilation rate will be for the maximum setting required for schoolroom occupancy
as determined by ASHRAE Standard 62. The control strategies will be reversed from
that during the initial cooling season monitoring time (May to June).
November 2001 – January 2002: Maintain the same control strategy for each building for
the beginning of the heating season.
January 2002 – March 2002: Reverse ventilation control strategies between the buildings
at each climate type. Do this during a site visit in late December 2001 or early January
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