Laars NEOTHERM NTH Series User manual

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

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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
Setting The Date And Time -----------------------------------------------------------------15
Combustion Setup Procedures --------------------------------------------------------16-17
Setting up 4-20 MA Set Point --------------------------------------------------------------18
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NEOTHERM Boilers and Water Heaters
Single Boiler Setup
1. Starting from the Home Screen press the
controller icon.
2. From the Status Summary Screen, press the
“Configure” button.
Adjusting Central Heat Set point for CH demand
3. Press, “CH-Central Heat Configuration”
to adjust the set point.
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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.
8. Press the back arrow button on the top right corner of
the screen to return to the “Configuration Menu”.
7. A smaller box will appear. Use the Up/Down arrows on the
screen to adjust the desired set point. Then Press “OK”.
6. Press on the “Setpoint” box to adjust the temperature.
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NEOTHERM Boilers and Water Heaters
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. Next, adjust the Maximum Outdoor Temperature,
Minimum Outdoor Temperature and Low Water
Temperature by pressing each set point box.
4. After configuring the outdoor reset, press the
back arrow on the top right corner of the screen
to return back to the Configuration Menu.
Use the Up/Down arrows
on the screen to adjust
the temperature.
Press “OK” after each
adjustment is made.
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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”.
4. Press the back arrow on the top right corner of the screen
to return to the Configuration Menu.
Domestic Hot Water Configuration
Skip this step if you are not using Domestic Hot Water
2. Make adjustments from the DHW set point screen.
3. After adjusting the DHW set point, press “OK’.
1. From the Configuration Menu,
press “DHW Domestic Hot Water Configuration”
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NEOTHERM Boilers and Water Heaters
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. See the manual for sensor and cascade wiring.
When a boiler is operating as part of a Lead/Lag system, it does not use the normal “CH set point” – it
uses the “Lead/Lag CH set point” on the Master control.
It is STRONGLY recommended to start each boiler to complete combustion set up and perform all safety
checks before setting up Lead/Lag cascade. See page 16-17 for combustion set up.
1. To log in, start from the Home Screen. Press the
controller icon.
Note: Some parameters will require a log in.
2. Press the pad lock symbol on the top right
side of the screen.
3. The key pad will appear.
Next, type in the password “LNT”, then press “OK”.
lnt
7
The log in will need to be completed on each boiler.

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LAARS Heating Systems
Lead/Lag Set Up Continues
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
down to “Lead Lag Master Configuration”.
Press, “Lead Lag Master Configuration”
Setting up the Lead/Lag Master Control
4. Confirm the Master control is “Enabled”.
If it is not enabled, press the box for “Disabled”.
Slide bar
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NEOTHERM Boilers and Water Heaters
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”. Here you can adjust the
desired Lead/ Lag system set point.
7. Press “Advanced Settings”
8. From this screen, use the Left or Right arrows to scroll
to other screens. Make adjustments if needed.
9. If you are using Outdoor Reset for Lead/ Lag, adjust the
Maximum Outdoor Temp, Minimum Outdoor Temp and
Low Water Temp by touching each set point line.
The set point screen will appear. Make the adjustment,
then press OK.
When finished, press the arrow to advance to the
“Warm Weather Shutdown” screen.
10. From the “Warm Weather Shutdown “ screen, adjust the
setpoint.
When finished, press the arrow to advance to the
“Rate Allocation” screen.
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LAARS Heating Systems
Number of
Boilers
Base load
value
1 NA
2 65%
3 50%
4 35%
5 35%
6 35%
7 35%
8 35%
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.”
12. From the Status Summary Screen, press the “Configure”
button.
13. Scroll down and press “Lead Lag Slave Configuration”.
Lead/Lag Master Control continues
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NEOTHERM Boilers and Water Heaters
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. You will need to “Log In” on each
slave boiler. See page 7 to log in.
1. Starting from the Home screen, press the controller Icon.
2. From the Status Summary Screen, press the “Configure” button.
Lead/Lag Master Control continues 11

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LAARS Heating Systems
Lead/Lag Slave configuration continues
1. Press “System Identification & Access”
Slide Bar
2. Press the box for “Boiler name”.Using the key pad, change the boiler
name on each slave boiler. Then press “OK”.
For this example we used “NeoTherm 2” for the boiler name.
Boiler three could be NeoTherm 3, etc..
Note: Depending on the screen configuration, you may need to use
the slide bar on the right side of the screen to scroll down to
the “Modbus address” lines.
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. On boiler three the address will be 3, etc…
This screen shows the MB1, MB2 address lines
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NEOTHERM Boilers and Water Heaters
Lead/Lag Slave configuration continues 13
Slide Bar
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.
5. Next, press the back arrow on the top right corner of the screen.
This will return you to the “Configure Menu”.
6. You will need to confirm the master configuration function
on each Slave boiler is disabled.
On the slave controls scroll down and press on
“Lead Lag Master Configuration”.
7. Press the “Enable” box and change it to “Disabled”, then press
“OK”.
8. Next, press the back arrow on the top right corner of the screen.
This will return you to the “Configure Menu”.

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LAARS Heating Systems
Lead/Lag Slave configuration continues
9. Use the slide bar on the right side of the screen to scroll down and
Choose “Lead Lag Slave Configuration”.
Slide Bar
10. Press “Disabled”.
11. A smaller box will appear on the screen. Choose
“Enable Slave for built - in Lead Lag Master”.
12. Press “OK”.
The Slave configuration is complete.
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NEOTHERM Boilers and Water Heaters
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”.
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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. See page 7 for login.
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NEOTHERM Boilers and Water Heaters
17
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.
Test timer
9. After completing the High Fire testing, press “Stop Test”.
10. Press “Minimum Modulation.
11. Press “Start Test”. You will have 5 minutes to check
and adjust Low fire CO2.
12. Repeat steps 6 through 11 a few times to confirm
High and Low fire CO2.
After CO2 has been completed press “Stop Test”.
Gas Type High Fire CO2
Natural 8.8 to 9.0 %
Propane 9.8 to 10 %
Refer to the manual for gas valve adjustment.
Low Fire CO2
0.5% Lower than
High Fire setting
CO2 Adjustments

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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. The password in LNT.
4. Press on the down arrow in the box
5. Select “S2 (J8-6) 4-20 mA
6. Press “OK”
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Product Support
Rochester, NH 800-900-9276
Ontario, Canada 905-238-0100

Customer Service and Product Support: 800.900.9276 • Fax [phone]
Headquarters: 20 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax [phone]
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax [phone]
www.Laars.com Printed in U.S.A. © Laars Heating Systems 1607 Document 1370
Notes:
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_______________________________________
_______________________________________
Product Support
Rochester, NH 800-900-9276
Ontario, Canada 905-238-0100