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Table 24 – 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 or
F.SPD
Commanded Economizer position or
Commanded Fan Speed
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
48/50PG and PM
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