Economizer Control Board (Ecb) - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

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
Indoor Air Quality (IAQ), Outdoor Air Quality (OAQ), enthal-
py and RH sensor. It also controls two power exhaust outputs.
DISPLAY NAME
INPUTS
Input power from MBB
RM.OC Remote occupancy switch
Outdoor enthalpy switch, or Indoor air
ENTH or IAQ.S
quality switch
IAQ Indoor air quality sensor
Outdoor air quality sensor, or Relative
OAQ or SP.RH
humidity sensor
Sensor Common
Actuator Common
OUTPUTS
Output power to enthalpy switch
Output power for loop power sensors
Output power to economizer actuator
PE.1 Power exhaust 1 relay
PE.2 Power exhaust 2 relay
EC.CP Commanded Economizer position
COMMUNICATION
Local Equipment Network (LEN)
Carrier Comfort Network (CCN)
Economizer actuator position (digital
EC.CP & EC.AP
control)

E.CTL. The ECB has inputs for
Fig. 33 — Economizer Control Board (ECB)
Table 30 — Economizer Control Board (ECB) Connections
POINT DESCRIPTION
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
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.
SENSOR LOCATION
control box
field installed
economizer, or return/space
return/space
field installed
79
 
ECON EC.AP. Diagnostic informa-
CONNECTION PIN
TYPE OF I/O
24 VAC
switch input
switch input
0-20 mA
0-20 mA
Ground
Ground
24 VAC
24 VDC
24 VAC
relay
relay
0-20 mA
communication
communication
MFT communication
NUMBER
J1, 1- 2
J4, 2
J4, 4
J5, 2
J5, 5
J5, 3
J7, 3
J4, 3
J5, 1
J7, 2
J8, 3
J8, 6
J9, 1
J2, 1-3
J3
J7, 1