LAARS M4-Ext - Installation Manual User Manual
Page 23
Page 23
LAARS Modulating Controls M4 & M4-EXT
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------ CONFIGURATION 1 ------
v1.00c
Reset F
Normal
Day/Night Schedules
All Off
BACK
EXIT
------ CONFIGURATION 2 ------
A=4-20ma
B=0-10v
C=0-5v
D=2-10v
CONFIGURATION
Button: MENU/<Maintenance>/<Configuration>
•
This menu option provides a consolidated view of the Startup settings the M4 has been
set to.
•
Additional stage settings will be available by selecting the NEXT option.
DISPLAY
The M4 display layout provides a variety of information that
gives an immediate picture of the operation status. The display
shows four boilers at a time. The two middle buttons scrolls the
screen to view additional boilers. Moreover, all the information
is brightly displayed. It can be viewed in brightly or dimly lit
rooms.
•
The buttons' functionality changes based on the screen and
menu level your in. The buttons' functionality are displayed
on a dark background on the screen bottom line.
•
Horizontal arrows are to scroll through the available stages.
•
Vertical arrows are to scroll through the menu functions
when in menus or to change values of settings when in its
specific screen.
OD=
35
F
SYS=
98
F
Prepurge Delay:67
A
B
C
D
50%
15%
---
---
STAGE
MENU
DISPLAY BOILER MODULATION STATUS
The M4 boiler modulation status gives immediate access to each boiler status. The following list show all possible boiler status:
•
---
Boiler is off due to no call for heat.
•
97%
Boiler is modulating at the indicated percentage.
•
ON
Boiler Stage Mode is set to ON and boiler is firing at 100% (boiler is in bypass).
•
OFF
Boiler Stage Mode is set to OFF and boiler stage is unavailable or boiler does not exist.
•
m95%
Boiler Stage Mode is set to Manual and set to the specified percent.
•
C/E
Boiler on Extension panel is communicating back to the M4..
DISPLAY MESSAGES
The M4 normal display layout reserved the second line for message indications. The following is a list of the most common
Message Display Line information:
•
Summer
The control is set to Summer. No heat is active.
•
Shutdown Active
The Shutdown Terminals are Shorted. No boilers will be active.
•
Shutdown by EMS
The EMS is below 2mA or above 22mA
•
DHW Call (171˚F)
There is a DHW (Domestic Hot Water) call. The M4 will Raise system Set Point to the indicated
temperature. DHW increases calculated temperature to 200˚F or Max Water Temperature, whichever
is lower.
•
Purge Delay: 23
The current boiler is in purge cycle and the remaining purge time in seconds is 23.
•
Holding Until 150˚F
The Lead boiler is in Last Stage Hold. This example shows that the lead stage will turn off when
system temperature reaches 150˚F.
•
System Run-On: 46
The System relay is ON for the System Run-On Delay. This example shows that it will remain in
System Run-On for an additional 46 seconds before turning off.
•
Waiting for Prove
The System relay is ON and the prove terminals are open before the lead boiler relay can energize.
•
Prove Failure
After boilers have run for a while, Prove signal was opened. The boiler relays will de-energize.
However, the System relay will remain energized.