1133391-YIM-A-1014
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Johnson Controls Unitary Products
SA BUS Pin connections at left on upper edge of economizer board
C
COM
Common for SA BUS power and
communication circuits
EconCtrlr parameter reports UCB-to-economizer board SA bus
communication status. Negative of the SA BUS communication
circuit to the UCB. Through the unit wiring harness, may continue
on to the 4-stage board and/or fault detection & diagnostics
board
–
–
Communication for SA BUS devices
EconCtrlr parameter reports UCB-to-economizer board SA BUS
communication status. Positive of the VDC (typically, a
fluctuating 1.5 to 3.5 volts reading to C; at least 0.25 volts lower
than +) SA BUS communication circuit to the UCB. Through the
unit wiring harness, may continue on to the 4-stage board and/or
fault detection & diagnostics board
+
+
Communication for SA BUS devices
EconCtrlr parameter reports UCB-to-economizer board SA BUS
communication status. Positive of the VDC (typically, a
fluctuating 1.5 to 3.5 volts reading to C; at least 0.25 volts higher
than –) SA BUS communication circuit to the UCB. Through the
unit wiring harness, may continue on to the 4-stage board and/or
fault detection & diagnostics board
ANALOG OUTPUTS Pin at center on upper edge of economizer board
J4
EX VFD
2-10 VDC positive output for the modulating
power Exhaust fan Variable Frequency Drive/
discharge damper modulating power exhaust
actuator
ExFanVFD parameter reports output status (0-100%) when
ExFType selection is Variable Frequency Fan; EAD-O parameter
reports output status (0-100%) when ExFType selection is
Modulating Damper. Used to ramp the power exhaust fan VFD/
position the discharge damper actuator.
COM
24 VAC common/0-10 VDC negative for the
power exhaust variable frequency drive/
discharge damper modulating power exhaust
actuator
Connects through circuit trace to 24V~ IN pin COM
24V~
24 VAC hot supplied for the discharge damper
modulating power exhaust actuator and
economizer actuator
Connects through circuit trace to 24V~ IN pin HOT
ECON
2-10 VDC output for the Economizer actuator
Econ parameter reports output status (0-100%). Used to position
the economizer actuator for minimum position, free cooling,
demand ventilation, cooling economizer loading and purge
functions
COM
24 VAC common/0-10 VDC negative for
economizer actuator
Connects through circuit trace to 24V~ IN pin COM
BINARY OUTPUTS Pin at right on upper edge of economizer board
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
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
Table 13: Simplicity SE Economizer Board Details (Continued)
Cover Label
Description
Function & Comments
