VAV economizer minimum position reset - 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 and related data

The setpoints and related data include the following items:

  • Economizer damper minimum position low speed fan (LowSpeedFan-MinPos)
  • Economizer minimum position setpoint (Econ-MinPos)
  • FAN control type - variable speed (FanCtl-Type)

Operation

When the control is in the occupied mode and the FAN output energizes and the VFD output reaches the high-fan speed setting, the economizer damper position is the economizer minimum position setpoint.

When the VFD output reaches then fan low-speed setting, the economizer damper position is the economizer damper minimum position low speed fan.

When the VFD output is between the fan high speed and fan low speed settings, the economizer damper is position proportionally between the economizer minimum position setpoint and the economizer damper minimum position low speed fan.

Note: To disable the VAV economizer minimum position reset, set the economizer minimum position setpoint and the economizer damper minimum position low speed fan to the same value.