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Table 2 0 — 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 m A 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 m A J9, 1
COMMUNICATION
Local Equipment Network (LEN) communication J 2, 1 --- 3
Carrier Comfort Network (CCN) communication J3
EC.CP &
EC.AP
Economizer actuator position
(digital control)
MFT
communication
J7, 1
48/50PD