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8.B Default Settings
This boiler is ready to go ‘Out of the Box’ and into
a typical single loop installation with a preset temp
at 190°F. If installing a more complex system,
Advanced Settings
will allow you to adjust the
system control to provide improved performance.
The control’s Outdoor Reset feature uses a reset ratio
method to control the boiler temperature. The reset ratio
determines how much the boiler temperature is adjusted
for changes in outdoor temperature. A reset ratio of
2.0 means that for each 1 degree drop in outdoor
temperature, the boiler temperature will increase 2
degrees. The control adds 10 degrees to the calculated
reset temperature and provides a 20 degree differential
for burner operation. You can check the current target
temperature at any time, by pressing the Test/Settings
button in four short intervals.
To set the desired outdoor Reset Ratio
1. Locate the Outdoor Design Temperature on the left
side of the chart (the coldest outdoor temperature at
design load conditions).
2. Locate the Boiler Target Temperature (the required
supply water temperature at design load conditions)
across from the Outdoor Design Temperature.
3. Follow the column up to the top of the chart to
obtain the Reset Ratio setting.
4. Adjust the ECONOMY dial on the control to the
Reset Ratio.
8.C.1.b Setting Warm Weather Shutdown
The warm weather shutdown feature prevents the
boiler from providing space heating when the outside
temperature reaches a user-selected temperature.
Available settings range from OFF or 40°-70°F. The
boiler will still operate to satisfy a call for domestic hot
water. The factory default setting for the warm weather
shutdown is 70°F.
To set the desired warm weather shutdown temperature:
Press and hold the TEST/SETTING BUTTON and
simultaneously adjust the ECONOMY dial to the desired
setting.
To turn the feature off - which will allow space heating
regardless of outdoor temperature - press and hold
the TEST/SETTING BUTTON and simultaneously turn
the ECONOMY dial fully counter-clockwise. Release
the TEST/SETTING BUTTON. Be sure to reset the
ECONOMY dial to the correct setting. Any time the
outdoor temp exceeds the WWSD set point the display
will toggle boiler temperature (8 seconds, outdoor
temperature (2 seconds), and OFF (2 seconds).
8.A.6.d FLAME
Illuminates when the pilot flame is lit. If pilot flame is
not sensed within 75 seconds or if flame is lost the
LED will blink.
8.C Advanced Settings
8.C.1 Programming the Outdoor Sensors
Outdoor Sensors are activated automatically
when the sensor is wired. See Section 7.D.1
on page 24. When connected, Outdoor reset
overrides the Economy Mode. The display will
toggle between boiler temperature (8 seconds)
and outdoor temperature (2 seconds). If the sensor
becomes damaged or disconnected, the control will
automatically revert back to the Economy Mode. The
display will no longer toggle outdoor temperature.
Important: the outdoor sensor must be plugged in
prior to setting the control.
Before installation, determine the proper location
for the sensor.
• Sensor should be mounted on the northern outside
wall of the house, shielded from direct sunlight.
• Sensor should be installed high enough off the
ground to protect it from accidental damage or
drifting snow.
• Sensor should be installed away from potential
heat sources such as exhaust fans, windows, or
doors.
8.C.1.a Setting the Outdoor Reset
The outdoor reset will regulate the boiler’s
temperature based on the temperature outside. On
cold days, the boiler will run at higher temperatures to
meet the heating load in the house. On warmer days,
the boiler will run cooler to save energy while still
meeting the heating needs of the house.
Ignition LED's (continued)
LAARS Heating Systems