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Out of production – LAARS LLS-1 - Instruction Manual User Manual

Page 11

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Laars Logic System

Page 11

OPER DIFFERENTIAL ___F

This sets the desired differential of the domestic

hot water temperature setting.

To change a value select it by hitting the enter

key, the value will start to flash. Use the arrow keys

to change the value, when finished hit the enter key,

the value will stop flashing. The readout will go back

to Display #1 if left inactive on any display for longer

than thirty (30) seconds.

Display #7 - Outdoor Reset

If this menu is selected the following display

will appear.

OUTDOOR RESET

NOTE: Outdoor Reset and Warm Weather

Shutdown are accomplished with Laars Outdoor

Reset sensor. Other sensors may not be

compatible with the LLS control logic.

Use the arrow keys to scroll through the

information, it will appear as follows:

USE OAT SENSOR = YES/NO

This tells the controller that the Laars OAT

(Outside Air Temperature) sensor has been installed.

OUTDOOR RESET ON _ OFF _

This turns the outdoor reset function on or off.

RESET RATIO _._

This setting is the outdoor reset ratio.

MAX RESET SETPT __F

This is the temperature at which the boiler will

override the reset ratio calculation, to ensure that the

boiler has the desired maximum temperature at the

boiler inlet (to prevent nuisance high limit trips and

higher-than-desired boiler temperature).

MIN RESET SETPT __F

This is the temperature at which the boiler will

override the reset ratio calculation, to ensure that the

boiler has the desired minimum temperature at its

inlet (to minimize the possibility of condensation).

WARM OAT SHTDN = ON/OFF

Warm weather shutdown (WWSD) can be

activated. In this mode, the boiler and pump will be

deactivated when the outdoor temperature reaches the

WWSD setpoint. In this mode, the pump will be

exercised if that option is chosen.

WARM OAT SHTDN @ __ F

This sets the temperature at which the user

would like the Warm Weather Shutdown to activate.

To change a value select it by hitting the enter

key, the value will start to flash. Use the arrow keys

to change the value, when finished hit the enter key,

the value will stop flashing. The readout will go back

to Display #1 if left inactive on any display for longer

than thirty (30) seconds.

Display #8 - Alarm Settings

If this menu is selected the following display

will appear.

ALARM SETTINGS

Use the arrow keys to scroll through the

information, it will appear as follows:

EXTERNAL ALARM = ON _ OFF _

If an external alarm is connected, this will

activate it.

INTERNAL ALARM = ON _ OFF _

The controller has an internal alarm, which

beeps under an alarm condition. This will activate the

internal alarm sound, if desired. Alarms will appear

in the form of icons and in the text display, regardless

of whether this is activated or not.

To change a value select it by hitting the enter

key, the value will start to flash. Use the arrow keys

to change the value, when finished hit the enter key,

the value will stop flashing. The readout will go back

to Display #1 if left inactive on any display for longer

than thirty (30) seconds.

Display #9 - Power Venter Option

If this menu is selected the following display

will appear.

POWER VENTER OPTION

Use the arrow keys to scroll through the

information, it will appear as follows:

VENTER OPTION = NO/YES

If a field-supplied power venter (or other draft

fan) has been installed, this will tell the controller to

activate the fan and check for the fan proving switch.

PREPURGE __ MIN

If desired, set a pre-purge cycle time, which will

run the fan for that amount of time before boiler

ignition takes place.

POSTPURGE __ MIN

If desired, set a post-purge cycle time, which

will keep the fan running after the call for heat has

been satisfied.

OUT OF

PRODUCTION