LAARS M4-Ext - Installation Manual - Manual (Page 24)

Page 24 LAARS Heating Systems
BOILER STAGE SETTINGS
Button: STAGE/
The Maintenance menu gives access to sensor and outputs trimming and Soft-Off. In
addition, you'll have access to view the Startup configuration settings.
• In most installations, all active boiler adjustments are the same, but each can be
configured differently if desired.
• If the Boilers are not set up properly, the M4 operation may appear to be erratic.
• When the STAGE button is depressed, the Boiler A Settings menu will be shown.
• Make all the appropriate settings for Boiler A (See below).
• After completing all the settings for Boiler A (See below), you have the option of
copying these settings to all other Boilers. Everything but the Mode -- Auto/Standby/
Manual/Off/On -- will be copied.
• Then select the Next Stage option from the menu to bring up the Boiler B Settings menu
and make all the settings. Continue until all boilers have been set.
• If a M4-Extension is connected to the M4, scrolling through stages using the Next and
Prev Stage menu options will scroll through the M4-Extension stages as well.
CAUTION
To be able to change the M4 settings, the Program/Run Switch must be set to
Program. The switch is located under the Enclosure Wiring Cover for security.
The Enclosure Wiring Cover can be securely closed using a lock.
----- STAGE A SETTINGS ----
Mode Off
Ignition % 1%
Mode Start % 80%
Copy Settings
BACK SELECT
CAUTION
Remember to set the Mode
for each stage. For Stages
that do not have a boiler,
contractor must change their
Mode to OFF. Otherwise the
M4 will include them in the
modulation calculation and
rotation. That might have dire
effects on system response.
RUN PROGRAM RUN PROGRAM
MODE
Auto, Standby, Manual, Off, On Default: Auto
Button: STAGE/Mode
•
The M4 only controls the modulation of boilers set to Auto or (after a delay) those set
to Standby. None of the other settings is recommended for output boilers connected to
active units.
• Any boiler without an active unit connected must be set to Off.
• The following list describes the MODE options:
BACK SAVE
------- STAGE A MODE --------
Auto
Standby
Manual
Off
On
Auto - The M4 will control the boiler’s operation to maintain the desired Set Point. Only Boilers set to Auto can be Lead boilers.
Standby Standby boilers can only be activated when all boilers in Auto have been at 100% modulation for a selectable period of
time. Standby is generally used when you want a specific boiler to be available in extreme load conditions. Note that a
Standby boiler Cannot be a Lead boiler.
Manual The Manual Mode should only be used when testing a boiler. Manual overrides the Prove input. The exact percent of
modulation for a boiler can be set with the Manual mode. Once selected, the unit will immediately turn on and modulate to
the selected percentage.
Off Any output Boiler A through D not connected to a physical unit should be set to Off. The Off Mode can also be used to
disable units that are being serviced.
On The On Mode should only be used when testing a boiler. The On Mode overrides the PROVE input. Once set to On the
boiler will immediately start firing and modulate to 100%.