York ZF078-150 Instruction Manual page 40

5464597-YIM-B-0518
Table 13: Smart Equipment™ Economizer Board Details (Continued)
Board Cover
Label Label
– –
+ +
EX VFD
COM
J4
24V~
ECON
COM
24V~
ACT-A
ACT-B
COM
J3
EX-FAN
COM
C COM
40
Description
Communication for SA BUS devices
Communication for SA BUS devices
ANALOG OUTPUTS Pin at center on upper edge of economizer board
2-10 VDC positive output for the modulating
power Exhaust fan Variable Frequency Drive/
discharge damper modulating power exhaust
actuator
24 VAC common/0-10 VDC negative for the
power exhaust variable frequency drive/
discharge damper modulating power exhaust
actuator
24 VAC hot supplied for the discharge damper
modulating power exhaust actuator and
economizer actuator
2-10 VDC output for the Economizer actuator
24 VAC common/0-10 VDC negative for
economizer actuator
BINARY OUTPUTS Pin at right on upper edge of economizer board
24 VAC hot supplied for an incremental
(floating control) economizer actuator
24 VAC hot outputs to position an incremental
(floating control) economizer actuator
24 VAC return
24 VAC common for an incremental (floating
control) economizer actuator
24 VAC hot output to energize power exhaust
fan contactor coil/VFD enable relay coil
24 VAC common/0-10 VDC negative for
economizer actuator
24V~ IN Pin connections at right on upper edge of economizer board
24 VAC transformer Common referenced to
cabinet ground
Function & Comments
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
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
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.
Connects through circuit trace to 24V~ IN pin COM
Connects through circuit trace to 24V~ IN pin HOT
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
Connects through circuit trace to 24V~ IN pin COM
Connects through circuit trace to 24V~ IN pin HOT
Unused in current control revision
Unused in current control revision
Connects through circuit trace to 24V~ IN pin COM
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.
Connects through circuit trace to 24V~ IN pin COM
24 VAC common connection to power the economizer board.
Connects through circuit traces to C/COM terminals and pins
distributed on the economizer board.
Johnson Controls Ducted Systems