79
Economizer Control Board (ECB)
The ECB controls the economizer actuator. (See Fig. 33 and
Table 30.) The control signal from the ECB uses either the
MFT (Multi-Function Technology) digital communication pro-
tocol or a 4 to 20 mA output signal as defined by the configura-
tion Configuration
ECON
E.CTL. The ECB has inputs for
Indoor Air Quality (IAQ), Outdoor Air Quality (OAQ), enthal-
py and RH sensor. It also controls two power exhaust outputs.
By digitally communicating with the ECB, the economizer ac-
tuator is able to provide the damper position and diagnostic in-
formation to the ComfortLink controller. The damper position
is displayed at Outputs
ECON
EC.AP. Diagnostic informa-
tion is displayed via Alert T414. More information about these
alarms is contained in the Alarms and Alerts section.
NOTE: 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.
Fig. 33 — Economizer Control Board (ECB)
Table 30 — Economizer Control Board (ECB) Connections
DISPLAY NAME POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O
CONNECTION PIN
NUMBER
INPUTS
Input power from MBB control box 24 VAC J1, 1- 2
RM.OC Remote occupancy switch field installed switch input J4, 2
ENTH or IAQ.S
Outdoor enthalpy switch, or Indoor air
quality switch
economizer, or return/space switch input J4, 4
IAQ Indoor air quality sensor return/space 0-20 mA J5, 2
OAQ or SP.RH
Outdoor air quality sensor, or Relative
humidity sensor
field installed 0-20 mA J5, 5
Sensor Common Ground J5, 3
Actuator Common Ground J7, 3
OUTPUTS
Output power to enthalpy switch 24 VAC J4, 3
Output power for loop power sensors 24 VDC J5, 1
Output power to economizer actuator 24 VAC J7, 2
PE.1 Power exhaust 1 relay relay J8, 3
PE.2 Power exhaust 2 relay relay J8, 6
EC.CP Commanded Economizer position 0-20 mA J9, 1
COMMUNICATION
Local Equipment Network (LEN) communication J2, 1-3
Carrier Comfort Network (CCN) communication J3
EC.CP & EC.AP
Economizer actuator position (digital
control)
MFT communication J7, 1
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