Johnson Controls ZY Series - Page 117

Table 75: Smart Equipment
™
Economizer Board Details
Board Label Cover Label Description Function and Comments
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.
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
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%.
IN9
24V~ 24 VAC hot supplied for the purge dry contact Connects through circuit trace to 24V~ IN pin HOT
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.
IN10
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 "Cable for FC Buses and SA Buses in Order of
Preference".
INSTALLATION MANUAL ZY SERIES 3-10ton 60 Hertz R-410A 117
Johnson Controls Ducted Systems