LAARS M4-Ext - Installation Manual - Manual (Page 30)

30
OD=
55 o
F SYS=
143 o
F
Prepurge Delay 15
<<A>> B
67% 20%
STAGE ◄ ► MENU
Button Functions
Buttons
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Boilers and Their Status
Messages
Outdoor and System Temperature
diSPLAY
The M4-CNC display layout provides a variety of information that gives an immediate picture of the operation status. The display
shows two boilers at a time. When extensions are present, the two middle buttons (◄ ►) scroll the screen to view additional boilers.
Moreover, all the information displayed can be viewed in brightly or dimly lit rooms.
• The buttons' functionality changes based on the screen and menu level. The buttons' functionality is 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.
• The Top line displays the Outdoor and System sensor values.
• The second line displays all messages pertaining to the operation or status. See "Display Messages".
• The third line will list the boiler stages. Any additional stages can be scrolled to using the two middle buttons. The lead boiler
letter will be bracketed. See "Lead Boiler Rotation" on page 25. The lead boiler in the lead group will have two sets of brackets.
• The fourth line lists each boiler modulation or sequencing status. See "Boiler Status".
BOiLER STATUS
The M4-CNC boiler status gives immediate access to each boiler stages or modulation.
• --- Boiler is off due to no call for heat.
• <<A>> Unit A is the Lead in the Lead group.
• <C> Unit C is the Lead in the Lag group.
• C/E M4-Extension panel is NOT communicating back to the M4-CNC. See "Connecting to the M4-Extension Panels" on
page 14.
• mON All boiler stages are set to ON.
• mOFF All boiler stages are set to OFF.
diSPLAY MOdULATiNg BOiLER STATUS
• 97% Boiler is modulating at the indicated percentage.
• m95% Boiler Stage Mode is set to Manual Modulation to the specified percent. See "Mode" on page 31.
diSPLAY SEqUENCiNg BOiLER STATUS
• AB Two-Stage boiler. The letters represent the stages assigned to that boiler
• High Boiler highest firing stage is active. The boiler Mode is set to either Auto or Standby.
• Med Boiler Middle stage on a 3-stage boiler is active. The boiler Mode is set to either Auto or Standby.
• Mhigh Boiler Middle High stage on a 4-stage boiler is active. The boiler Mode is set to either Auto or Standby.
• Mlow Boiler Middle Low stage on a 4-stage boiler is active. The boiler Mode is set to either Auto or Standby.
• Low Boiler lowest firing stage is active. The boiler Mode is set to either Auto or Standby.
diSPLAY MESSAgES
The M4-CNC display layout reserved the second line for message indications. The following is a list of the most common Message
Display Line information:
• Boost To 170˚F The Boost has started 30 minutes before the Day Schedule setting and the Boost temperature is 170˚F.
• DHW Call (180˚F) There is a DHW call. The M4-CNC will raise the system Set Point to the indicated temperature. DHW
increases calculated temperature to the DHW Set Point. See "Domestic Hot Water Set Point" on page 19.
• 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. See "Last Stage Hold" on page 25.
• Lag Delay: 123 The lead boiler is at 100% and the remaining purge time to start the lag boiler in seconds is 123. See "Lag
Delay" on page 26.
LAARS Heating Systems
HT# 059104-00 B