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 . 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.