Laars NEOTHERM NTH Installation And Operation Instructions Manual
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Laars NEOTHERM NTH Installation And Operation Instructions Manual

080–850 mbtu/h modulating boiler
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See also: Installation Instructions and Operating Manual
Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed by
a qualified installer, service agency, or gas
supplier.
Installation and Operation
Instructions for
NeoTherm
Modulating Boiler
Model NTH
Sizes 080–850 MBTU/h
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion ou
pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d'essence ni
d'autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L'installation et l'entretien doivent être assurés par
un installateur ou un service d'entretien qualifié ou
par le fournisseur de gaz.
Document 1218C
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  • Page 1 Installation and Operation Instructions Document 1218C Installation and Operation Instructions for NeoTherm ® Modulating Boiler Model NTH Sizes 080–850 MBTU/h FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.

  • Page 2: Table Of Contents

    LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. 5.2.2.2 Adjusting the Outdoor Reset On or Off ..24 5.2.2.3 Adjusting Low Boiler Temperature Setpoint .. 24 General Information 5.2.2.4 Adjusting High Outdoor Temperature Introduction ............3 Setpoint ............24 Model Identification .........

  • Page 3: General Information

    LAARS Heating Systems warranty will All electrical wiring is to be done in accordance be voided. The installation must conform to the with the local codes, or in the absence of local codes, requirements of the local jurisdiction having authority, with: 1) The National Electrical Code ANSI/NFPA No.

  • Page 4: Appliance Overview

    1.4 Warranty LAARS Heating Systems’ NeoTherm appliances are covered by a limited warranty. The owner should complete the warranty registration at www.Laars.com. All warranty claims must be made to an authorized LAARS Heating Systems representative. Claims must include the serial number and model (this information can be found on the rating plate), installation date, and name of the installer.
  • Page 5 NeoTherm Boiler Page 5 Figure 3. Location of Components, Sizes 150–210. Figure 4. Location of Components, Size 285.
  • Page 6 LAARS Heating Systems Page 6 Figure 5. Location of Components, Size 399. Figure 6. Location of Components, Size 500.
  • Page 7 NeoTherm Boiler Page 7 Figure 7. Location of Components, Size 600. Figure 8. Location of Components, Sizes 750 and 850.
  • Page 8 LAARS Heating Systems Page 8 AIR INLET VENT Size in cm in cm in cm in cm 24¾ 63 19½ 49 38¼ 97 24¾ 63 19½ 49 38¼ 97 24¾ 63 19½ 49 38¼ 97 24¾ 63 26¾ 68 38¼ 97 25 64 26¾...

  • Page 9: Section

    NeoTherm Boiler Page 9 A NeoTherm unit can take combustion air from 1.7 Locating the Appliance the space in which it is installed, or the combustion NeoTherm is for indoor installations only. air can be ducted directly to the unit. Ventilation air The appliance should be located to provide must be provided in either case.

  • Page 10: Intake Combustion Air

    2.1.2 Intake Combustion Air recommended. The combustion air can be taken through the wall, or through the roof. When taken from the wall, it must be taken from out-of-doors by means of the LAARS horizontal wall terminal, shown in Table 3. See Table 2 select the appropriate diameter air pipe.
  • Page 11 NeoTherm Boiler Page 11 The NeoTherm is a Category IV appliance and In Canada all venting used must meet the may be installed with PVC and CPVC that complies following requirements: with ANSI/ASTM D1785 F441, or a stainless steel ULC-S636 certified and marked venting system that complies with UL 1738 Standard The first 3 feet of venting must be accessible for (see...
  • Page 12 LAARS Heating Systems Page 12 U.S. Installations (see note 1) Canadian Installations (see note 2) A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm) deck, or balcony See note 6 See note 6 B= Clearance to window or door that may be Direct vent only: 12 inches (30cm);...

  • Page 13: Locating Vent & Combustion Air Terminals

    (see Table 3), must be used when floor drain is not accessible). the heater takes air from a side wall. Contact Laars for The condensate drain must be installed so as to AL24-4C termination fittings. Consider the following prevent accumulation of condensate. When a...

  • Page 14: Installations In The Commonwealth Of Massachusetts

    LAARS Heating Systems Page 14 opening on the end of the terminal must be at least 12" Inspection (30cm) above the point at which it penetrates the roof, The state or local gas inspector of the side-wall and high enough above the roof line to prevent blockage horizontally vented gas fueled appliance shall not from snow.

  • Page 15: Gas Supply And Piping

    NeoTherm Boiler Page 15 system should be corrected so that the installation NEOTHERM conforms to the National Fuel Gas Code, ANSI NATURAL GAS REQUIRED Z223.1/NFPA 54 and/or CSA B149.1, Installation TO SIZE PIPING: CU FT Codes. When resizing any portion of the common SIZE / HR.

  • Page 16: Water Connections

    LAARS Heating Systems Page 16 Figure 13. Hydronic Piping — Single Boiler (zoning with circulators). pressure port on the gas valve. Low gas pressure could SECTION 4. be an indication of an undersized gas meter, undersized Water Connections gas supply lines and/or an obstructed gas supply line.
  • Page 17 NeoTherm Boiler Page 17 Figure 14. Hydronic Piping — Single Boiler with Indirect DWH Tank (zoning with circulators).. hangers used. Rigid hangers may transmit noise through Suggested piping diagrams are shown in Figures the system resulting from the piping sliding in the 13 through 19.

  • Page 18: Cold Water Make-Up

    LAARS Heating Systems Page 18 Figure 15. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating using Low Loss Header and Zone Valves. hydraulic separator) such that the pump that is mounted Models 399 and 500 can be ordered without a on the boiler ONLY serves the boiler.

  • Page 19: Freeze Protection

    Do not use automotive antifreeze. Laars of the boiler or at the time of boiler installation. recommends a mixture of minimum 20% and maximum...
  • Page 20 LAARS Heating Systems Page 20 Figure 17. Hydronic Piping — Multiple Boilers with Indirect DWH Tank Piped from System Loop. 35% of inhibited HVAC glycol solution, which contains BOILER HEAD (FT) AT TEMP RISE PUMP an anti-foaming agent, as the preferred method of freeze SIZE 20°F...
  • Page 21 NeoTherm Boiler Page 21 Figure 18. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones (zoning with circulators).
  • Page 22 LAARS Heating Systems Page 22 Figure 19. Hydronic Piping — Heating zones with indirect DWH tank piped with zone pumps (indirect directly off boiler). Boiler pump must shut down during DHW.

  • Page 23: Recognized Chemicals

    NeoTherm Boiler Page 23 SECTION 5. TEMPERATURE RISE IN °F 20°F 25°F 30°F Electrical Connections FLOW FLOW FLOW SIZE WARNING 14.9 10.1 The appliance must be electrically grounded in 10.0 23.1 17.0 12.4 accordance with the requirements of the authority 14.3 28.5 11.4...

  • Page 24: User Mode

    LAARS Heating Systems Page 24 information. Menus are accessed by using the buttons adjustment is complete press the ) button DONE NEXT located on the display. to move to next menu item. 5.2.1 User Mode 5.2.2.1 Adjusting the Temperature USER...

  • Page 25: Adjusting Low Outdoor Temperature Setpoint

    NeoTherm Boiler Page 25 successive boilers are brought on-line. Boilers will 5.2.2.5 Adjusting Low Outdoor modulate together (up or down) unless rat drops to Temperature Setpoint SETUP SETUP Confirm the display is in SETUP SETUP SETUP mode. Scroll to the below 20%, in which case one boiler at a time will drop LOD menu.

  • Page 26: Temperature Control

    NeoTherm DHW sensor or contractor-supplied aquastat polarity sensitive. should be connected to Terminal block 6 connections labeled "DHW temp sensor". The Laars sensor is the only sensor that must be used with this controller. To connect an aquastat use the far right terminals on TB6-5, TB6-6, labeled "DHW temp sensor".

  • Page 27: Wiring Diagram

    NeoTherm Boiler Page 27 5.7 External Control Connections NeoTherm units are built with a terminal strip to receive a 4-20mA modulating signal from an external controller (such as a building automation system or multiple boiler control). The Brown/White wire is for signal (+) and the Brown wire is for signal (–).
  • Page 28 LAARS Heating Systems Page 28 Figure 24. Wiring Diagram (all sizes).

  • Page 29: Operating Instructions

    NeoTherm Boiler Page 29 13. Check gauge for correct water pressure and also SECTION 6. check water level in the system. If the height Operating Instructions indicated above the boiler insures that water is at the highest point in the circulating loop, then the 6.1 Filling the Boiler System system is ready for operation.

  • Page 30: Boiler Setpoint And Adjustment

    LAARS Heating Systems Page 30 label and turn on gas and electrical power to appliance. NeoTherm will enter the start sequence. Blower and pump will energize for pre-purge, then the ignition sequence starts. After all safety devices are verified, the gas valve opens. If ignition doesn’t occur, turn off the NeoTherm, check that...

  • Page 31: Shutting Down The Neotherm

    NeoTherm Boiler Page 31 1/16 of a revolution increments until the CO for further information. within the range identified. Remove the differential pressure gauge from the Measure the CO in the flue products at low air and gas pressure taps making sure to close all fire.

  • Page 32: Appliance Maintenance And Component Description

    7.2 Appliance Maintenance and extended periods in locations where freezing Component Description normally occurs, it should be isolated from the Use only genuine LAARS replacement parts. system and completely drained of all water. Low water cutoffs, if installed, should be checked Caution every 6 months.

  • Page 33: Burner

    NeoTherm Boiler Page 33 board to unlatch the clips from the control panel. Rotate 7.2.1 Burner the control around the fastening points on the right side Check the burner for debris. Remove the blower of the control to remove the hooks from the control arm assembly to access the burner.

  • Page 34: Heat Exchanger Coils

    LAARS Heating Systems Page 34 the burner door blower arm. If the fan is determined to separate container. be defective replace the existing fan with a new one NOTE: The Warranty does not cover damage caused reversing the steps above. Make sure to install all of the...
  • Page 35 NeoTherm Boiler Page 35 CODE# PROBLEM PROBABLE CAUSE SOLUTION COMMON LOCKOUT CODES Internal error Flame rod to ground Check wiring / probe grounded, dirty probe Flame rod to ground leakage Faulty flame detector Clean or replace flame detector 24VAC voltage low/high Faulty transformer Check/correct supply line voltage;...

  • Page 36: Short Cycling

    If the heating load 9.1 General Information drops below the minimum input of the boiler for an To order or purchase parts for the LAARS extended period, the boiler will have a tendency to short NeoTherm, contact your nearest LAARS dealer or cycle.

  • Page 37: Parts List

    NeoTherm Boiler Page 37...
  • Page 38 LAARS Heating Systems Page 38...
  • Page 39 NeoTherm Boiler Page 39...
  • Page 40 LAARS Heating Systems Page 40...
  • Page 41 NeoTherm Boiler Page 41 Figure 27. Jacket Components.
  • Page 42 LAARS Heating Systems Page 42 Figure 28A. Internal Components, sizes 80–210. Figure 28B. Internal Components, sizes 285–850.
  • Page 43 NeoTherm Boiler Page 43 Figure 29A. Gas Train Components (80-500).
  • Page 44 LAARS Heating Systems Page 44 Figure 29B. Gas Train Components (600-850).
  • Page 45 NeoTherm Boiler Page 45 Figure 30. Heat Exchanger Components.
  • Page 46 LAARS Heating Systems Page 46 Figure 31 Electrical Components.
  • Page 47 NeoTherm Boiler Page 47...
  • Page 48 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering) 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A. © Laars Heating Systems 0910 Document 1218C...

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