Low limit tempering - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

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

Use low limit tempering in applications that use the HVAC unit as additional ventilation. For example, in a restaurant kitchen. Low limit tempering engages the first stage heat when there are low ambient outside air requirements to keep the supply air at a set minimum temperature. This maintains customer comfort when there is not a call for heat from the thermostat.

To enable low limit tempering, complete the following step.

  • Select Details > Control > Htg > Setup. Select LL_Enable and press ENTER.
  • Select Details >Fan > Setup > FanCtl-Type must be set to Single Speed or Fixed Variable

The low limit upper SAT setpoint (LL_UPSAT_SP) default is 80. The low limit lower setpoint (LL_LOWSAT_SP) default is 65°F. Both setpoints are adjustable.