77
Table 54 — 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, 2-3
ENTH or
IAQ.S
Outdoor enthalpy switch, or
Indoor air quality switch
economizer
space or return
switch input J4, 4-3
IAQ Indoor air quality sensor space or return 4-20 mA J5, 2-3
OAQ or
SP.RH
Outdoor air quality sensor, or
Space humidity sensor
economizer
space
4-20 mA J5, 4-3
OUTPUTS
PE.1 Power exhaust 2 relay relay J8, 3
PE.2 Power exhaust 2 relay relay J8, 6
EC.CP or EC.AP Economizer actuator (analog, digital) 4-20 mA J9, 1
COMMUNICATION
Local Equipment Network (LEN) communication J2, 1-3
EC.CP and EC.AP Economizer actuator (digital control) communication J7, 1-3
Fig. 23 — Economizer Control Board (ECB)
a48-7156
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