Carrier 48/50PD05 - Manual (Page 49)

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Economizer Control Board (ECB)
The ECB controls the economizer actuator. (See Fig. 17 and Table
20.) The control signal from the ECB uses either the MFT
(Multi-Function Technology) digital communication protocol or a
4 to 20 mA output signal as defined by the configuration
Configuration→ECON→E.CTL. The ECB has inputs for
Indoor Air Quality (IAQ), Outdoor Air Quality (OAQ), enthalpy
and RH sensor. It also controls two power exhaust outputs.
By digitally communicating with the ECB, the economizer
actuator is able to provide the damper position and diagnostic
information to the ComfortLink controller. The damper
position is displayed at Outputs→ECON→EC.AP. Diagnostic
information is displayed via Alert T414. More information about
these alarms is contained in the Alarms and Alerts section.
IMPORTANT: The Economizer Control Board (ECB) has a
4-position DIP switch that is factory set to ‘0’ (ON, towards
the center of the board). Do not change this setting.
C07027
Fig. 17 -- Economizer Control Board (ECB)
48/
50P
D