5835254-YIM-A-1119
Johnson Controls Ducted Systems
33
Indoor air quality
Indoor air quality (IAQ) is regulated by an indoor sensor input.
The IAQ sensor is connected to the economizer board through
the IAQ analog input terminal and the associated COM and
24V~ inputs on the economizer board. Terminal IAQ accepts a
0 to +10 VDC signal with respect to the IAQ terminal. When the
signal is below its setpoint, the actuator is allowed to modulate
normally in accordance with the enthalpy and mixed air sensor
inputs. When the IAQ signal exceeds its setpoint setting and
there is no call for free cooling, the actuator is proportionately
modulated from the 0 to 10 VDC signal, with 0 VDC
corresponding to full closed and 10 VDC corresponding to full
open. When there is no call for free cooling, the damper
position is limited by the IAQ max. damper position setting.
When the signal exceeds its setpoint (demand control
ventilation setpoint) setting and there is a call for free cooling,
the actuator modulates from the minimum position to the full
open position based on the highest call from either the mixed
air sensor input or the IAQ voltage input.
• Optional CO
2
space sensor kit - part no. 2AQ04700524
Smart Equipment™ economizer board - binary outputs
Location
Board
label
Cover
label
Description
Function and comments
E
J3
24V~
24 VAC hot supplied for an incremental
(floating control) economizer actuator
Connects through circuit trace to 24V~ IN pin HOT
ACT-A
24 VAC hot outputs to position an incremental
(floating control) economizer actuator
Unused in current control revision
ACT-B
24 VAC return
Unused in current control revision
COM
24 VAC common for an incremental (floating
control) economizer actuator
Connects through circuit trace to 24V~ IN pin COM
EX-FAN
24 VAC hot output to energize power exhaust
fan contactor coil/VFD enable relay coil
ExFan parameter reports output status (Off-On) when ExFType
selection is Non-Modulating, Modulating Damper or Variable
Frequency Fan. Used to turn on/enable the power exhaust fan
motor.
COM
24 VAC common/0-10 VDC negative for
economizer actuator
Connects through circuit trace to 24V~ IN pin COM
Smart Equipment™ economizer board - 24V
~
IN connections
Location
Board
label
Cover
label
Description
Function and comments
F
C
COM
24 VAC transformer Common referenced to
cabinet ground
24 VAC common connection to power the economizer board.
Connects through circuit traces to C/COM terminals and pins
distributed on the economizer board.
R
HOT
24 VAC transformer HOT
24 VAC hot connection to power the economizer board.
Connects through circuit traces to R/24V~ terminals and pins
distributed on the economizer board.
Smart Equipment™ economizer board - binary inputs
Location
Board
label
Cover
label
Description
Function and comments
G
IN9
PURGE 24 VAC hot input from the PURGE dry contact
Purge parameter reports input status (False with 0 VAC input-
True with 24 VAC input). When Purge status is True, heating and
cooling operation is prevented, the indoor blower and power
exhaust fan operate, the economizer actuator is positioned to
100%.
24V~
24 VAC hot supplied for the purge dry contact
Connects through circuit trace to 24V~ IN pin HOT
IN10
EX VFD
FLT
24 VAC hot input from the power Exhaust
Variable Frequency Drive Fault contact
ExFanVFDFlt parameter reports input status (Normal with 0 VAC
input-Alarm with 24 VAC input) when ExFType selection is
Variable Frequency Fan. When ExFanVFDFlt status is Alarm,
EX-FAN fan output is prevented.
24V~
24 VAC hot supplied for the power exhaust
variable frequency drive fault contact
Connects through circuit trace to 24V~ IN pin HOT
