Table 51: Smart Equipment
™
economizer board - analog inputs
Location Board label
Cover
label
Description Function and comments
R 24V~ 24 VAC hot supplied for the outdoor air humidity sensor Connects through circuit trace to 24V~ IN pin HOT
IN3 OAH
0-10 VDC positive input from the Outdoor Air Humidity
sensor
OAH parameter reports input status (0-100%H). Used in outdoor air enthalpy
calculation for dual enthalpy economizer free cooling changeover.
C COM
24 VAC common/0-10 VDC negative for the outdoor air
humidity sensor
Connects through circuit trace to 24V~ IN pin COM
R 24V~ 24 VAC hot supplied for the supply air humidity sensor Connects through circuit trace to 24V~ IN pin HOT
IN4 SAH
0-10 VDC positive input from the Supply Air Humidity
sensor
SAH parameter reports input status (0-100%H). Unused in current control
revision.
C COM
24 VAC common/0-10 VDC negative for the supply air
humidity sensor
Connects through circuit trace to 24V~ IN pin COM
R 24V~ 24 VAC hot supplied for the indoor air quality sensor Connects through circuit trace to 24V~ IN pin HOT
IN5 IAQ 0-10 VDC positive input from the Indoor Air Quality sensor
IAQRange parameter sets the CO2 parts per million measured by the indoor
air quality sensor when it outputs 10 VDC; IAQ parameter reports input status
(0-5000ppm). Used for demand ventilation functions if the NetIAQ parameter
indicates ‑Unrel.
C COM
24 VAC common/0-10 VDC negative for the indoor air
quality sensor
Connects through circuit trace to 24V~ IN pin COM
R 24V~ 24 VAC hot supplied for the outdoor air quality sensor Connects through circuit trace to 24V~ IN pin HOT
IN6 OAQ
0-10 VDC positive input from the Outdoor Air Quality
sensor
OAQRange parameter sets the CO2 parts per million measured by the outdoor
air quality sensor when it outputs 10 VDC; OAQ parameter reports input status
(0-5000ppm). Used for demand ventilation function when DVent-Mode selection
is Diff between IAQ and OAQ and the NetOAQ parameter indicates ‑Unrel.
C COM
24 VAC common/0-10 VDC negative for the outdoor air
quality sensor
Connects through circuit trace to 24V~ IN pin COM
R 24V~ 24 VAC hot supplied for the air monitoring station sensor Connects through circuit trace to 24V~ IN pin HOT
IN7 FR AIR
0-10 VDC positive input from the air monitoring station
sensor
MOA-Range parameter sets the cubic feet per minute/liters per second
measured by the air monitoring station sensor when it outputs 10 VDC; Fr Air
parameter reports input status (0-50000CFM/23595lps). Used for economizer
minimum position reset in speed-controlled indoor blower applications.
C COM
24 VAC common/0-10 VDC negative for the air monitoring
station sensor
Connects through circuit trace to 24V~ IN pin COM
R 24V~ 24 VAC hot supplied for the building pressure sensor Connects through circuit trace to 24V~ IN pin HOT
IN8 BLDG PRES 0-5 VDC positive input from the Building Pressure sensor
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.
H
C COM
24 VAC common/0-5 VDC negative for the building
pressure sensor
Connects through circuit trace to 24V~ IN pin COM
Table 52: Smart Equipment
™
economizer board - LED details
Location Board label Cover label Description Function and comments
POWER POWER Green UCB power indicator Lit indicates 24 VAC is present at 24V~ IN COM and HOT pins
FAULT FAULT Red networking error and firmware error indicator
1/10th second on/off flashing indicates a networking error (polarity, addressing,
etc.) or a firmware error (likely correctable with re-loading from USB flash drive)
B
SA BUS SA BUS Green UCB SA bus communication transmission indicator
Lit/flickering indicates UCB-to-economizer board SA bus communication
is currently active, off indicates the economizer board is awaiting SA bus
communication
Installation Manual: YORK
®
Sun
™
Select YV28 to YV50
75
Johnson Controls Ducted Systems
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