LAARS M4-Ext - Installation Manual - Manual (Page 18)

Page 18 LAARS Heating Systems
MAXIMUM WATER TEMP
Adjustable 90ºF - 240ºF Default: 240ºF
Button: MENU/Set Point/Offset/..../Maximum Water Temperature
in Reset only
• This is the highest temperature heating water the M4 will circulate through the heating
system. It is available in Reset mode only.
• When using a radiation system, it should be set according to the tubing or floor
manufacturer’s specification.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.
BACK SAVE
--- MAXIMUM WATER TEMP ----
240
F
[]
SYSTEM SETTINGS
Button: MENU/<System Settings>
The Settings 1 and Settings 2 menus provide access to adjusting and fine-tuning the system for
enhanced comfort and more fuel savings. The M4 behaves differently based on the selected
Control Modes (see Startup Settings).
BACK SELECT
---------- SETTINGS 1 ----------
Gain +0
Lead Rotation Time
Purge Delay 0.0min
Lag Delay 0min
<More Settings>
BACK SELECT
---------- SETTINGS 2 ----------
Standby Time 10min
System Run-On 0min
Setback 0 F
Last Stage Hold 0 F
Set Time 12:03Pm
<Day/Night Schedules>
RUN PROGRAM RUN PROGRAM
• Gain
• Lead
Rotation
• Purge Delay
• Lag Delay
• Standby Time
• System Run-On
• Setback
•
Last Stage Hold
• Day/Night Schedules
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.
GAIN
Adjustable -10 to +10 Default: 0
Button: MENU/<System Settings>/Gain
•
The Gain adjusts the aggressiveness of the M4 PID logic to control how much
modulation is changed when the system temperature is different from the Set Point.
• A Gain of 0 is a good starting point for all systems.
• If during normal load conditions, the system temperature tends to fluctuate significantly,
decrease the Gain by two numbers (for example, from 0 to -2). Wait for at least 15
minutes before evaluating how the change has affected the system.
• If, during normal load conditions the system temperature tends to remain consistently
below the Set Point (or consistently above the Set Point), increase the Gain by two
numbers (for example, from 0 to 2). Wait for at least 15 minutes before evaluating how
the change has affected the system.
BACK SAVE
---------------- GAIN --------------
+0
F
[ ]
BACK SAVE
-------- LEAD ROTATION -------
Manual
Time
Last-On
BACK SAVE
---- MANUAL LEAD STAGE ----
A
B
C
D
E
BACK SAVE
--- AUTO ROTATE PERIOD ---
24
hrs
[ ]
LEAD BOILER ROTATION
Adjustable Manual, Time (1 hr to 60 Days), Last-On Default: Time (24Hours)
Button: MENU/<System Settings>/Lead Rotation
•
The Lead Boiler is the first boiler brought on when output is required.
• The Lead Boiler can be rotated automatically, manually or based on Last-On. The
automatic rotation is recommended.
• The current Lead Boiler is shown in brackets on the main display.
• Only Boilers which are set to Auto Mode can be Lead. Therefore, not all the Boilers may
be available when manually selecting a new Lead Boiler.