LAARS SC 12 - Install and Operating Manual - Manual (Page 9)

Page 9 Laars Sequencing Controls
• The Minimum Water Temperature can be adjusted from 110°F to 180°F.
• To change the minimum water temperature, hold down the center button while pushing either the UP button to increase the UP UP
value, or the DOWN button to decrease the value. DOWN DOWN
• When the correct value is shown, release the button and wait approximately 5 seconds. If any changes were made, the display
will fl ash.
Set Input Terminals 9 and 10 to PROVE or DHW Default: Prove Pr
• If the system is designed to provide heat and DHW, the SC can be programmed to hold a 200°F Setpoint when a call for DHW is
connected to Input Terminals 9 and 10 (see pg. 25).
• All other applications should use the default Prove setting (see pg. 24).
• If the display shows Pr the Input terminals 9 and 10 will function in the Prove mode. If the display shows dh then the same
terminals will function in the DHW mode.
• To change the Input terminal functions, hold down the center button while pushing either the UP button to increase the value, or UP UP
the DOWN button to decrease the value. DOWN DOWN
• When the correct value is shown, release the button and wait approximately 5 seconds. If any changes were made, the display
will fl ash.
Set the Sequencing Mode Default: Normal nor
• For most applications, the Normal or PID type Sequencing mode provides the most stable operation. Stages are brought on or off
based on the rate of change of the system temperature and the impact a stage has on that rate.
• For applications where the stages are oversized for most load conditions, the SC has a Oversize System OSS Sequencing mode
that brings on stages proportionally, based on how high above or far below the Set Point the current system temperature is. For
more details, (see pg. 21).
• If the display shows Normal nor then the SC will Sequence in the PID type mode. If the display shows OSS then SC will
Sequence stages based on a throttling range around the Set Point.
• To change the Sequence function, hold down the center button while pushing either the UP button to increase the value, or the UP UP
DOWN button to decrease the value. DOWN DOWN
• When the correct value is shown, release the button and wait approximately 5 seconds. If any changes were made, the display
will fl ash. This completes the startup Sequence and the SC will display the sensor temperature.