2
Title 24 EconoMi$er 2 Supplement
The DDC economizer factory--installed in this rooftop unit meets some parts or all of the requirements of
the new California Title 24 economizer standards.
There are (2) significant parts to the economizer section of Title 24:
— Mandatory section 120.2 Economizer Fault Detection and Diagnostics (FDD). This section’s
intent is to allow only California Energy Commission (CEC) listed economizer controllers to be
used to properly determine when an economizer control system fails and identifying the specific
failure. If your unit has either of these (2) Carrier control systems, the economizer meets Title 24
section 120.2 mandatory FDD requirements.
S SystemVu control system
(A field--installed Return Air Temperature sensor accessory is required to meet Title 24.)
S ComfortLink control system
(A field--installed Return Air Temperature sensor accessory is required to meet Title 24.)
S RTU Open control system
— Prescriptive section 140.4
deals with several economizer related issues including minimal
damper leakage, damper life cycle testing, 5 year economizer warranty, etc. Because section
140.4 is “prescriptive” they may not be required on some jobs. When an economizer with “Ultra
Low Leak” dampers is ordered, it meets the section 140.4 requirements.
NOTE: These economizers also meet ASHRAE 90.1 requirements.
Carrier factory--installed economizers that meet some or all of Title 24 are:
ECONOMIZER TYPE CONTROLLER DAMPER MEETS TITLE 24
Economizer 2 SystemVu Ultra Low Leak Section 120.2 and 140.4
Economizer 2 ComfortLink Ultra Low Leak Section 120.2 and 140.4
Economizer 2 ComfortLink Standard Leak Section 120.2
Economizer 2 RTU Open Ultra Low Leak Section 120.2 and 140.4
Economizer 2 RTU Open Standard Leak Section 120.2
NOTE: PremierLink controller does not meet Title 24 section 120.2
SUP--TI24--02SI
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