Submittal Sheet

800.900.9276 • Fax [phone] (Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax [phone] (Applications Engineering)
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 1211 Document 5088-14B
A Display Setup menu shall allow the user to adjust the LCD contrast, and to customize the display’s homescreen. The user shall be able to
choose five of the following parameters to display on the homescreen – system setpoint, operating temperature, outlet temperature, outlet tempera-
ture, inlet temperature, outdoor temperature, boiler temperature rise (delta T), lead-lag operating temperature, lead-lag system setpoint, fan speed,
flame signal, firing rate, domestic water temperature, stack temperature, and 4-20mA input level. The homescreen shall also indicate the boiler
name, what firing state the boiler is in, if there is a demand on the boiler, if the system is in password-level status, and shall show any holds, alerts,
or lockouts that are present. The homescreen shall be accessible at any time by pressing a homescreen button on the display.
A Quick Start menu shall present only the select few parameters that are needed for a simple, single boiler installation.
The Advanced Setup menu shall give the installer access to all adjustable parameters, for more complex installations, including; all lead-lag set up
parameters, boiler high limit, boiler temperature setpoint and on/off differentials, domestic water temperature setpoint and on/off differentials,
domestic water priority time, boiler stack temperature limit, pump delay and exercise values for all pumps controlled, PID parameters, outdoor reset
selection, low boiler setpoint temperature (for outdoor reset operation), boiler temperature at high outdoor temperature (for outdoor reset operation),
boiler setpoint at low outdoor temperature (for outdoor reset operation), warm weather shutdown, automatic remote signal detection, anti-short-
cycle feature adjustment, and °F or °C display.
The control shall have a Test menu that allows the user to force the boiler into minimum or maximum firing rate for 10 minutes, for set-up purposes.
The test menu shall also allow the burner to be turned on or off, and the pumps to be set to on or auto, for testing purposes. The control shall show
a count-down timer, enabling the user to see how much time is left for the test segment.
A Diagnostics menu shall allow the user to see analog inputs, digital inputs, and the history of alerts and lockouts. Analog inputs shall include –
outlet temperature, inlet temperature, temperature rise (delta T), domestic water temperature, stack temperature, outdoor temperature, fan speed,
flame signal, firing rate, 4-20mA input level, and system sensor temperature. Digital inputs shall include – main valve state, alarm status, demand
status, safety chain status, and interlock status. The control shall display information about holds, alerts, and errors in both text form, and with
codes numbers for further analysis.
Standard features shall include:
• High condensing efficiency
• Modulation down to 20% of full fire
(5:1 turndown)
• Sealed combustion chamber
• Pre-mix stainless steel burner
• Low NOx system exceeds the most
stringent regulations for air quality -
10ppm NOx
• Horizontal or vertical direct vent
• Horizontal vent and air terminals
• Vent and air pipe lengths of up to 100
equivalent feet (each)
• Built-in condensate trap
• Vent temperature cutoff
• Indirect water heater priority (sensor
included)
• ASME 30 psi (207 kPa) working pressure
heat exchanger
• Stainless steel heat exchanger with
welded construction
• ASME "H" stamp
• 30 psi (207 kPa) ASME rated pressure
relief valve
• Temperature and pressure gauge
• Drain valve
• Multiple pump control for boiler pump,
system pump and indirect domestic water
pump, each with delay
• Electronic PID modulating control
• Direct spark ignition
• Large user-interface and display
• Alarm output
• Accepts external (4-20mA or 0-10VDC)
modulation signal
• Outdoor reset (sensor included)
• On/Off toggle switch
• Manual reset high limit
• Burner site glass
• Flue gas temperature cutoff
• Zero clearance to combustible surfaces
• 12-year limited warranty