LAARS Heating Systems
Page 82
Figure 43. External Firing Rate Example
8.D.9.b External Firing Rate
With External Firing Rate selected, the unit will initiate a heat demand once the analog input signal exceeds the
Demand On value. Once the demand is initiated, the analog input signal must be lower than Demand Off to remove
the heat demand. The external analog signal will activate stages as shown in
Figure 43
. In this control mode, if the
unit outlet temperature exceeds the Auto Reset High Limit setting, the boiler will shut down and an “Auto Reset High
Limit” condition will appear on the Messages screen. Once the outlet temperature decreases below the value of (Auto
Reset High Limit – Reset Differential), the boiler will turn back on at the firing rate set by the analog input signal.
C O N F I G U R AT I O N
8.D.10 Time & Date
To navigate to the Time & Date Quick Start Screen, touch the Time and Date area of ANY Screen.
NOTE: The Time is set in a 24 hour parameter but displays only as a 12 hour clock with the
AM / PM automatically added.
The Time & Date Quick Start Screen allows adjustment of the following parameters:
• Hour
• Minute
• Month
• Day
• Year
