Main valve - 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:

  • Number of gas valves installed (#GasVlvs)
  • Reset lockouts (ResetLO)

Inputs

The inputs include the following items:

  • 24 VAC monitoring at the MV input on the UCB (MV, GV2, GV3)
  • 24 VAC from terminal W1

Outputs

The output for the main valve is the output relay for fan.

Operation

Any time the UCB senses W1 and does not read voltage at the gas valve for a continuous 5-minute period, it flags an alarm and displays an alarm on the user interface. If GV reappears after the alarm, the alarm is reset and normal operation occurs. If W1 goes away, the UCB resets the alarm.

Any time the UCB senses GV voltage without W1 the UCB energizes the fan relay immediately. If the voltage remains for a continuous 5-minute period, the UCB flags an alarm, locks on the fan relay, and displays the alarm on the user interface. If the GV voltage goes away, the alarm is reset and the fan performs a delay off.

Note: To manually reset the lockout condition, navigate to the ResetLO point in the user interface and change the value from no to yes.