Page 11
Laars Sequencing Controls
SET POINT CONTROL WITH OSS SEQUENCING
Dip Switch 8 - OFF
Press SELECT
Button
DISPLAY
Press and hold either the UP or DOWN button to adjust
Once
Set Point
The Set Point is the temperature which the SC will sequence stages to hold. Note that if you are
using the External Set Point, you will not be able to change the Set Point unless you adjust the 4-
20mA input. The Set Point is adjustable between -30
°
F to 250
°
F. Default is 70
°
F.
Twice
♦
Outdoor Temp
This is the outdoor sensor temperature value.
3 Times
♦♦
Outdoor Cutoff
Available only when the outdoor sensor is installed. When the outdoor temperature falls below the
Outdoor Cutoff value, the SC will activate stages for heat. The Outdoor Cutoff can be set ON or OFF
and from 40 to 100°F. Default is 60°F.
3 or 4 Time
System Delay
The System Delay controls how long the System relay will remain energized after the last Output has
been turned off or the outdoor temperature rises above the Starter. The System Delay is adjustable
from 0 to 30 minutes. Default is 0.
4 or 5 Times
♦♦
Program Offset
The Programmed Offset fi ne tunes the Pressure input or the External Set Point. With a known 4mA
input, the offset can be set to make the External Set Point 110°F. The Program Offset is adjustable
between -10
°
F to +10
°
F. Default is 0
°
F.
4 or more Times
Throttling Range
The throttling range sets the number of degrees or psi above and below the Set Point where stages
will be turned on or off. The Throttle Range is adjustable from 1
°
F to 20
°
F. Default is 5°F. See page
24 for details.
5 or more Times
♦♦
Setback
The Setback adjusts the number of degrees the Set Point water temperature will be reduced when
Input terminals 7 and 8 are closed. If the Setback is set to 0, then the system will Shutdown on a
closure. The Setback is adjustable from 0
°
F to 40
°
F. Default is 0°F.
5 or more Times
♦♦
DHW Priority Time
Only available when the System Output is set to System Pump (dip switch 1 is ON and dip switch 6 is
OFF ) This setting adjusts the amount of time the System relay output will remain off during a DHW
call. If the DHW call is not satisfi ed before the DHW priority time has elapsed, the System relay will
energize to provide heat. The DHW Priority is adjustable from 0 to 4 hours in half hour increments.
Default is 0.
5 or more Times
♦
Default
The SC returns to the default display of system water temperature.
♦
Actual temperature values are not adjustable
♦♦
May not be available, depending on status of the outdoor sensor and dip switches.
