VAV unoccupied cooling - 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

This section details the VAV unoccupied cooling setpoints, related data, inputs, outputs, and operation.

Setpoints and related data

The setpoints and related data include the following items:

  • VAV unoccupied cooling setpoint (VAVClgUnocc-Sp)
  • Operational space temperature (OprST)

Outputs

The output for VAV unoccupied cooling is 24 VAC from C1, C2, C3, and C4 compressor outputs.

Operation

The control must be in an unoccupied mode and not in morning cool-down mode. If the operational space temperature rises higher than the VAV unoccupied cooling setpoint all compressor stages energize with a 15-minute delay between stages.

Compressors remain energized until the operational space temperature reaches the VAV unoccupied cooling setpoint -3°F.