Commissioning Instructions

Appendix
6
20 | 21
Restricted
A6V12006922
6 Appendix
ASHRAE 90.1-2019
6.5.3.2.3
Supply air temperature reset controls.
Multiple zone HVAC systems must include controls that
automatically reset the supply air temperature in response to
representative building loads or to outside air temperature.
The controls shall reset the supply air temperature at least
25% of the difference between the design supply air
temperature and design room temperature. Controls that
adjust based on zone humidity are allowed. Zones that are
expected to experience relative constant loads, such as
electronic equipment rooms, shall be designed to fully reset
the supply air temperature.
IECC -2017
C403.6.5
Supply air temperature reset controls
Multiple-zone HVAC systems shall include controls that
automatically reset the supply-air temperature in response
to representative building loads, or to outdoor air
temperature. The controls shall be configured to reset the
supply air temperature not less than 25 percent of the
difference between the design supply air temperature and
the design room air temperature.
California Title 24 -2019
140.4(f)
Supply Air Temperature Reset Controls
Space-conditioning systems supplying heated or cooled air
to multiple zones shall include controls that automatically
reset supply-air temperatures. Air distribution systems
serving zones that are likely to have constant loads shall be
designed for the air flows resulting from the fully reset
supply air temperature. Supply air temperature reset controls
shall be:
1. In response to representative building loads or to
outdoor air temperature; and
2. At least 25 percent of the difference between the design
supply-air temperature and the design room air
temperature.
140.4(d)2iii
iii. The first stage of heating consists of modulating the zone
supply air temperature set point up to a maximum set point
no higher than 95 degrees F while the airflow is maintained
at the deadband flow rate.