50
Table 20 — 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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