Optional Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment - York XP SERIES W/SIMPLICITY Installation Manual

5168273-YIM-A-1115
Table 9: Simplicity SE Economizer Board Details (Continued)
Board Cover
Label Label
BLDG
IN8
PRES
C COM
PURGE
IN9
24V~
EX VFD
FLT
IN10
24V~
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). The exhaust fan on/off set-points can
be changed via the SSE control. Factory defaults are as
follows: Economizer damper position for exhaust fan to activate
60%. Economizer damper position for exhaust fan to de-
activate 20%. The adjustable range is 10%-99%.
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.
28
Description
0-5 VDC positive input from the Building
Pressure sensor
24 VAC common/0-5 VDC negative for the
building pressure sensor
BINARY INPUTS at right on lower edge of economizer board
24 VAC hot input from the PURGE dry contact
24 VAC hot supplied for the purge dry contact
24 VAC hot input from the power Exhaust
Variable Frequency Drive Fault contact
24 VAC hot supplied for the power exhaust
variable frequency drive fault contact
Function & Comments
BldgPres parameter reports input status (-.250-.250"/w/-.062-
.062kPa). Used for modulating power exhaust functions when
ExFType selection is Modulating Damper or Variable Frequency
Fan.
Connects through circuit trace to 24V~ IN pin COM
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%.
Connects through circuit trace to 24V~ IN pin HOT
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.
Connects through circuit trace to 24V~ IN pin HOT
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
Optional 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.
Johnson Controls Unitary Products