LAARS M4-LHS - Installation Manual - Manual (Page 38)

HT# 059295-00
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M4-LHS installation and Operation Manual
BOiLEr STaTuS
The M4-LHS boiler status gives immediate access to each boiler stages or modulation.
• --- Boiler is off due to no call for heat.
• <<A>> A is the lead boiler in the lead Hybrid group. See "Lead Stages" on page 32.
• <C> C is the lead boiler in the lag Hybrid group or the lead boiler in Modulating Boiler Type. See "Lead Stages" on page 32.
• C/E Extension panel is NOT communicating back to the M4-LHS. See "Connecting to the Extensions and 4-20mA EMS
Interface" on page 15.
• 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 39.
• h50% Boiler is in post purge for 30 seconds.
DiSPLaY MESSagES
The M4-LHS 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.
See "Boost Mode" on page 25.
• DHW Call (180˚F) There is an indirect DHW call. The M4-LHS will raise the system Set Point to the indicated temperature.
DHW increases calculated temperature to the DHW Set Point. See "Indirect Domestic Hot Water Set
Point" on page 24.
• 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 32.
• Interface Module Error There is no communication to the BACnet Module Interface while the BACnet Mode is set to Enable.
See "BACnet Mode" on page 26.
• 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 33.
• Outdoor Cutoff The outdoor temperature is above the Outdoor Cutoff setting. No boilers will be active for heating. See
"Outdoor Cutoff Temperature" on page 30.
• Prove Failure After boilers have run for some time, Prove signal has ended. All boilers set to Auto or Standby will
de-energize. However, the System relay will remain energized. See "Prove/Indirect Domestic Hot Water
(DHW) Priority" on page 24 and "Wiring the Prove" on page 13.
• Purge Delay: 23 A boiler is in purge cycle and the remaining purge time in seconds is 23. See "Purge Delay" on page 31.
• Setback to: 130˚F The Night Schedule or Setback input is active. Current Setback temperature is 130˚F. See "Setback"
on page 31. See "Day - Night Schedule" on page 36.
• Shutdown Active The Shutdown Terminals are Shorted. No boilers will be active. See "Shutdown/Tstat/Setback Mode" on
page 24. Also See "Wiring the Shutdown, Tstat, or Setback" on page 12.
• Summer The control is set to Summer. No heat is active. See "Season" on page 27.
• Switch in: 00:30 The switch from one group to the other will take place after 30 minutes. See "Switch Delay" on page 21.
• 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. See "System Run-On" on page 31.
• Tstat Call The Tstat Terminals are Shorted. Boilers will be active. See "Shutdown/Tstat/Setback Mode" on page 24.
• Waiting for Prove The System relay is ON and the prove terminals are open before the lead boiler relay can energize. See
"Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24.
BOiLEr STagE MENu