LAARS M4-Ext - Installation Manual - Manual (Page 6)

Page 6 LAARS Heating Systems
MAKE SURE YOU HAVE THE RIGHT CONTROL
If you need the M4 to do additional tasks that either are not listed or do not know how to configure them, contact LAARS.
INITIAL SETUP
Setting an Initial Program will ease the configuration of the M4 and will give the opportunity to utilize many of the energy saving features
and give more comfortable heat when needed.
The program should consist of the following:
• Selecting the features that your system can utilize,
• Installation: Install the Control, switches and sensors,
• Setting the System Startup,
• Setting the System Settings,
• Setting the Stages
• Adjusting Reset Ratio and Water Offset (In Reset Mode Only)
SELECTING THE SYSTEM FEATURES
The M4 has been designed with Hydronic building heating as the primary purpose. With this in mind, many of the M4 features can be
utilized to ease, enhance and improve your system performance. Some of these features are listed in this section.
OUTDOOR RESET OR SET POINT
•
The M4 can control the System Temperature either by adjusting the calculated temperature according to the Outdoor Temperature
(Outdoor Reset) or by maintaining an adjustable Set Point. The earlier relies on an Outdoor Sensor (supplied with the control) and
achieves better fuel savings in addition to better comfort.
NUMBER OF STAGES
•
The M4 can be configured to control up to 4 modulating boilers. It can control up to 16 boiler stages using a maximum of two M4
Extension Panels
MODULATION MODE
•
The M4 can stage boilers using one of two methods. Normal Modulation Mode, allows it to increase the modulation of the lead
boiler. When the lead boiler reaches its modulation start point adjustment and does not satisfy the load, the M4 will start the next
boiler and so on. This mode targets boilers that can run more efficient at higher modulation rates.
• The Parallel Modulation Mode can modulate several boilers together as a one large boiler. This mode is useful for boilers that are
more efficient at lower firing points.
MODULATING SIGNAL
•
The M4 is designed to accurately control the output from 0 to 100% of modulation for each of these different types of motors. One
M4 can even control a variety of the above different modulation motors.
AUTOMATIC ROTATION AMONG BOILERS
•
Rotating the first burner to be activated on a call for output promotes even wear on all burners. The M4 has three modes of rotation:
Manual, Last-ON, or Time automatically rotating every selected time period from every hour to every 60 days.
STANDBY BOILER
•
Any boiler can be configured as a Standby boiler. It withholds a specific boiler from being included in the Lead Rotation. However,
the Standby boiler will be fired only as a backup when all other stages combined cannot satisfy the demand and after an adjustable
delay period.
SETBACK OR DAY/NIGHT SCHEDULING
Two Setback modes are available for the M4:
•
The Day/Night Scheduling provides an adjustable time-based schedule for the Setback.
• The Setback mode uses an external signal to switch the operation of the M4 in and out of setback mode.