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.
