Laars NEOTHERM NTH Series Manual
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Laars NEOTHERM NTH Series Manual

Modulating boilers and volume water heaters with touchscreen display
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Start Up Guide
Indoor
Start Up Guide for
N
T
EO
HERM
with
Touchscreen Display
Modulating Boilers and
Volume Water Heaters
Indoor models NTH & NTV
Sizes 285 – 850 MBTU/h
Outdoor models NTH & NTV
Sizes 150 – 850 MBTU/h
ON / OFF
SWITCH
Outdoor
Document 1370
®
THE TOUCH SCREEN
ON OUTDOOR UNIT
IS LOCATED BEHIND
FRONT PANEL
2 SCREWS
DOOR
LATCHES
(RELEASE BOTH
LATCHES TO OPEN)
DOOR
HANDLE
(PULL TO OPEN)

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Summary of Contents for Laars NEOTHERM NTH Series

  • Page 1 Start Up Guide Document 1370 Start Up Guide for HERM ® with Touchscreen Display Modulating Boilers and Volume Water Heaters Indoor models NTH & NTV Sizes 285 – 850 MBTU/h Outdoor models NTH & NTV Sizes 150 – 850 MBTU/h ON / OFF THE TOUCH SCREEN SWITCH...

  • Page 2: Table Of Contents

    LAARS Heating Systems Table Of Contents Single Boiler Set Up -------------------------------------------------------------------------3-4 Setting Up Outdoor Reset --------------------------------------------------------------------5 Warm Weather Shutdown -------------------------------------------------------------------6 Domestic Hot Water Configuration --------------------------------------------------------6 Log in ----------------------------------------------------------------------------------------------7 Lead/Lag Set Up ------------------------------------------------------------------------------7-8 Lead/Lag Master Configuration ---------------------------------------------------------9-11 Lead/Lag Slave Configuration ----------------------------------------------------------11-14...
  • Page 3 Boilers and Water Heaters HERM Single Boiler Setup Adjusting Central Heat Set point for CH demand 1. Starting from the Home Screen press the controller icon. 2. From the Status Summary Screen, press the “Configure” button. 3. Press, “CH-Central Heat Configuration” to adjust the set point.

  • Page 4: Single Boiler Set

    LAARS Heating Systems Single Boiler Setup Continue 4. Confirm that “CH enable” reads Enabled as shown in this example. 5. Press the right had arrow on the screen to get to the set point screen. 6. Press on the “Setpoint” box to adjust the temperature.

  • Page 5: Setting Up Outdoor Reset

    Boilers and Water Heaters HERM Setting Up Outdoor Reset Outdoor Reset is Strongly Recommended. You may skip this step if you are not using this function 1. From the Configuration Menu, Press “Outdoor Reset Configuration” 2. Confirm that Central Heat is “Enabled”. 3.

  • Page 6: Warm Weather Shutdown

    LAARS Heating Systems Warm Weather Shutdown You may skip this step if you are not using Outdoor Reset 1. From the Configuration Menu, choose “Warm Weather Shutdown Configuration”. 2. Press on the set point box and adjust the shutdown. 3. After adjusting the shutdown set point, then press “OK”.

  • Page 7: Lead/Lag Set Up

    Boilers and Water Heaters HERM Lead/Lag Set Up You can cascade up to eight NeoTherm boilers together. One boiler becomes the Lead or Master control and the other boilers become the Lag or Slaves controls. Note: The system sensor and outdoor sensor will need to be wired to the Master boiler only. The input from these sensors is used by the Master control to control the modulation rate of all of the operating boilers it is connected to.
  • Page 8 LAARS Heating Systems Lead/Lag Set Up Continues Setting up the Lead/Lag Master Control 1. Starting from the Home Screen press the controller icon. 2. From the Status Summary Screen, press the “Configure” button. 3. Use the slide bar on the right side of the screen to scroll Slide bar down to “Lead Lag Master Configuration”.
  • Page 9 Boilers and Water Heaters HERM Setting up the Lead/Lag Master Control continues 5. A smaller box will appear on the screen. Choose the box for “Enable”, then press “OK”. 6. With the Master Control now Enabled , press the setting box labeled “CH setpoint”.
  • Page 10 LAARS Heating Systems Lead/Lag Master Control continues Number of Base load Boilers value 11. Adjust the “Base Load Common” value to the number of boilers in the cascade system. See chart for values. Note: In the Lead/Lag Slave Sub-Menu, Identify each control (including the Lead/Lag Master) as a slave by turning on “Slave Enable.”...
  • Page 11 Boilers and Water Heaters HERM Lead/Lag Master Control continues 14. Press “Disabled” 15. A smaller box will appear on the screen. Choose “Enable Slave for built - in Lead Lag Master”. 16. Then press “OK”. The Lead boiler (Master control) is now configured. Slave boilers Lead/Lag configuration Complete the Slave Configuration on Each boiler in the system.
  • Page 12 LAARS Heating Systems Lead/Lag Slave configuration continues Modbus Address All of the boilers will each need their own boiler name and Modbus address. On boilers two through eight you will need to change the Modbus Address. Example: On the Master boiler the Modbus address is 1. On boiler two the address will be 2.

  • Page 13: "Lead Lag Master Configuration

    Boilers and Water Heaters HERM Lead/Lag Slave configuration continues 3. Change both MB1 and MB2 address. Press on EACH address box to change the address. 4. Use the arrows on the screen to change the address number, then press “OK”. Repeat this on each slave boiler keeping them in sequential order.
  • Page 14 LAARS Heating Systems Lead/Lag Slave configuration continues Slide Bar 9. Use the slide bar on the right side of the screen to scroll down and Choose “Lead Lag Slave Configuration”. 10. Press “Disabled”. 11. A smaller box will appear on the screen. Choose “Enable Slave for built - in Lead Lag Master”.

  • Page 15: Setting The Date And Time

    Boilers and Water Heaters HERM Setting the Date and Time 1. From the “Home” screen press the “Setup” button. 2. Press the “Display Setup” button. 3. Press the “Set Date/Time” button. 4. Use the arrows on the screen to change the Date and Time, then press “OK”.

  • Page 16: Combustion Setup Procedures

    LAARS Heating Systems Combustion Setup Procedure 1. Starting from the Home Screen press the controller icon. 2. From the Status Summary Screen, press the “Diagnostics” button. 3. Press the “Diagnostics Test” button. 4. Make sure you are logged in and the padlock symbol is unlocked.
  • Page 17 Boilers and Water Heaters HERM 5. Start the boiler and confirm it is running. 6. Press “Start Test”. 7. Press “Maximum Modulation”. 8. You will have 5 minutes to check and adjust High Fire CO2. A test timer will appear on the bottom right corner of the screen counting up to 5 minutes.

  • Page 18: Setting Up 4-20 Ma Set Point

    LAARS Heating Systems Setting up 4-20 MA Set Point 1. Starting from the Configuration Menu, press “CH-Central Heat Configuration”. 2. From the “Central Heat” screen use the arrows on the screen to advance to the “Setpoint” screen. 3. From the Setpoint screen, press “Local”. If you are prompted to log in, press OK and log in.
  • Page 19 Notes: _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ Product Support Rochester, NH 800-900-9276 Ontario, Canada 905-238-0100...
  • Page 20 800.900.9276 • Fax 800.559.1583 Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Printed in U.S.A. © Laars Heating Systems 1607 Document 1370...

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