5168274-BIM-I-1121
28
Johnson Controls Ducted Systems
Power Exhaust Damper Set Point
With power exhaust option, each building pressurization
requirement will be different. The point at which the power
exhaust comes on is determined by the economizer damper
position (Percent Open).
Indoor Air Quality - IAQ
Indoor Air Quality (indoor sensor input): The Indoor Air Quality
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 set point, the actuator is allowed to modulate normally
in accordance with the enthalpy and mixed air sensor inputs.
When the IAQ signal exceeds its set point 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 set point (Demand Control
Ventilation Set Point) 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 CO2 Space Sensor Kit Part #2AQ04700524
• Optional CO2 Sensor Kit Part #2AQ04700624
Field Installed BAS-Ready Economizer Power
Exhaust Damper Set Point Adjustment
Remove the economizer access panel from the unit. Loosen,
but do not remove the two panel latches. Locate the
economizer actuator, where the following adjustment can be
made.
With power exhaust option, each building pressurization
requirement will be different. The point at which the power
exhaust comes on is determined by the economizer's outdoor
damper position. The actuator's auxiliary switch adjustment
screw should be set at the damper position at which the power
exhaust is needed. The adjustment screw can be set between
25 to 85 degrees open.
Replace the economizer access panel.
C
COM
24 VAC common/0-5 VDC negative for the
building pressure sensor
Connects through circuit trace to 24V~ IN pin COM
BINARY INPUTS at right on lower edge of economizer board
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
1. When wiring unit and other devices using the SA Bus and FC Bus, see Table 20.
Table 9: Smart Equipment™ Economizer Board Details (Continued)
Board
Label
Cover
Label
Description
Function & Comments
