LAARS S8Ext - Installation Manual User Manual
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LAARS Sequencing Controls S8 & S8EXT
• To view the values of specific time period, use the two middle buttons to scroll to that time and read the upper left temperature.
• The first screen will be the System Temperature History. By clicking on the Next button, you'll be able to view the Outdoor
Temperature History, then, the Return History followed by the DHW History.
CONFIGURATION
Button: MENU/
• This menu option provides a consolidated view of the Startup settings.
• Additional settings will be available by selecting the NEXT option.
S8 V1.00
Outdoor reset
Heating-BreakOnRise
Day/Night Schedule
DHW Parallel
BACK NEXT
8 X On/Off
PID,Fault Stgs Off
BACK NEXT
DISPLAY
The S8 display layout provides a variety of information that gives an immediate picture of
the operation status. The display shows four heating or cooling units 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. 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.
Sys=
155
F OD=
58
F
DHW all (200 F)
HI HI LO ----
BOILER
MENU
Outdoor Temp
System Temp
Message Display Line
Units and their
Status
Button functions
Button
DISPLAY OUTPUT STATUS
The S8 unit sequencing status gives immediate access to each unit status. The following list show all possible boiler status:
•
Two-Stage unit and Unit AB is the Lead in sequencing. (Brackets indicate Lead Stage).
• ---
Unit is de-energized. The unit Mode is set to Auto.
• STB
Unit is set to be a Standby Unit.
• HI
Unit highest stage is active. The unit Mode is set to either Auto or Standby.
• MED
Unit Middle stage is active. Available in Three-stage units only. The unit Mode is set to either Auto or Standby.
• MHI
Unit Middle High stage is active. Available in Four-stage units only. The unit Mode is set to either Auto or Standby.
• MLO
Unit Middle Low stage is active. Available in Four-stage units only The unit Mode is set to either Auto or Standby.
• LO
Unit Lowest stage is active. The unit Mode is set to either Auto or Standby.
• ON
All Unit Stages are set to ON.
• OFF
All Unit Stages are set to OFF or unit does not exist.
• C/E
Unit on Extension panel is not communicating back to the S8..
•
Unit Pumps are being controlled by the S8.
•
Unit Valves are being controlled by the S8.
DISPLAY MESSAGES
The S8 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.
• Winter
The control is set to Winter. No cooling is active.
• Outdoor Cutoff
The Outdoor temperature is above the Outdoor Cutoff in heating or below it in cooling.
• Shutdown Active
The Shutdown Terminals are Shorted. No heating or cooling units 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 S8 will Raise system Set Point to the indicated
temperature. DHW increases calculated temperature to 200˚F or Max Water Temperature, whichever
is lower.