Electro- -Mechanical Controls - Carrier TC Supplement Manual

The 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. Carrier offers the EconoMi$er X control system, using the W7220 Honeywell controller,
that meet the mandatory section 120.2 FDD requirements:
— Prescriptive section 140.4 deals with several economizer related issues including minimal
damper leakage, damper life cycle testing, 5 year economizer warranty, etc. Because section
140.4 is "prescriptive" they may not be required on some jobs. When an economizer with "Ultra
Low Leak" dampers is ordered, it meets the section 140.4 requirements.
NOTE: These economizers also meet ASHRAE 90.1 requirements.
Carrier factory- -installed economizers that meet some or all of Title 24 are:
ECONOMIZER TYPE
EconoMi$er X
EconoMi$er X
The EconoMi$er X W7220 controller is factory set for either a 1 speed or 2 speed unit, depending upon
the unit ordered.
NOTE: EconoMi$er X can also be used with 3 speed LC units.
The following section provides general information and typical wiring diagrams for the W7220
controller.
Title 24 EconoMi$er X Supplement

ELECTRO- -MECHANICAL CONTROLS

CONTROLLER
Honeywell W7220
Honeywell W7220
DAMPER
Ultra Low Leak
Standard Leak
3
MEETS TITLE 24
Section 120.2 and 140.4
Section 120.2