Power exhaust
Setpoints
• Economizer enable: ON
• Power exhaust enable: ON
• Modulating power exhaust: OFF
• Exhaust VFD installed: OFF
• Building pressure sensor enabled: OFF
• Economizer damper position for exhaust fan:
ON Percent
• Economizer damper position for exhaust fan:
OFF Percent
Inputs
No inputs are present for non-modulating power
exhaust.
Outputs
• 2 VDC to 10 VDC from ECON on the
economizer expansion module
• 24 VAC from EX-FAN to energize the exhaust
fan on the economizer expansion module
Operation
Operation details include the following items:
• Compares the economizer output to the
economizer damper position for exhaust fan
on and off
• Energizes the exhaust fan when the
economizer output is above the economizer
damper position for exhaust fan on
• De-energizes the exhaust fan when the
economizer output is below the economizer
damper position for exhaust fan off
Modulating power exhaust with
VFD
Setpoints and related data
The setpoints and related data include the following
items:
• Power exhaust fan type (ExFType) variable
frequency fan
• Building pressure setpoint (Bldg-Sp)
• Building pressure reading (Bldg-Pres)
Inputs
The input for modulating power exhaust with VFD
is 0 VDC to 5 VDC from building pressure sensor to
terminal BLDG PRES.
Outputs
The outputs include the following items:
• 2 VDC to 10 VDC from EX VFD
• 24 VAC from EX-FAN
Operation
If the building pressure is above the building
pressure setpoint, the exhaust output (EX VFD)
increases. If the building pressure is below the
building pressure setpoint, the exhaust output
(EX VFD) decreases. The EX-FAN binary output is
energized any time the EX VFD analog output is
greater than 2.16 VDC. The EX-FAN binary output
is de-energized any time the EX VFD analog output
is less than or equal to 2.16 VDC. The rate of
change of the analog output is determined by the
deviation from setpoint and length of time away
from setpoint.
Installation Manual: YORK
®
Sun
™
Select YV28 to YV50
73
Johnson Controls Ducted Systems
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