Modulating power exhaust - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active

Setpoints

The setpoints and related data include the following items:

  • Power exhaust fan type (ExFType) modulating damper
  • Exhaust damper position fan on (ExDmpPosFanOn)
  • Exhaust damper position fan off (ExDmpPosFanOff)
  • Building pressure setpoint (Bldg-Sp)
  • Building pressure reading (Bldg-Pres)

Inputs

The input for modulating power exhaust is: 0 to 5 VDC from building pressure sensor to terminals BLDG PRES.

Outputs

The outputs include the following items:

  • 2 to 10 VDC from EX VFD for exhaust discharge damper modulation.
  • 24 VAC from EX-FAN to energize exhaust fan

Operation

If the building pressure is above the building pressure setpoint, the exhaust damper output (EX VFD) increases to open the exhaust damper. If the building pressure is below the building pressure setpoint, the exhaust damper output (EX VFD) decreases to close exhaust damper.

The EX-FAN output energizes when the exhaust damper output is greater than the exhaust damper position fan on.

The EX-FAN output de-energizes when the exhaust damper output is less than the exhaust damper position fan off.