Laars NeoTherm NTH Installation And Operation Instructions Manual
Modulating boiler sizes 080–500 mbtu/h
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Also See for NeoTherm NTH:
- Installation and operation instructions manual (104 pages) ,
- User information (14 pages) ,
- Service manual (118 pages)
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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 080–500 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 1218B
®
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Table of Contents
Related Manuals for Laars NeoTherm NTH
Summary of Contents for Laars NeoTherm NTH
- Page 1 Installation and Operation Instructions Document 1218B Installation and Operation Instructions for NeoTherm ® Modulating Boiler Model NTH Sizes 080–500 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.
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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 ..23 5.2.2.3 Adjusting Low Boiler Temperature Setpoint .. 23 General Information 5.2.2.4 Adjusting High Outdoor Temperature Introduction ............3 Setpoint ............23 Model Identification ......... -
Page 3: General Information
1) The National Electrical Code ANSI/NFPA No. manual, or the LAARS Heating Systems warranty will 70-latest Edition, or 2) CSA STD. C22.1 “Canadian be voided. The installation must conform to the Electrical Code - Part 1”. -
Page 4: Unpacking
LAARS Heating Systems Page 4 include the serial number and model (this information can be found on the rating plate), installation date, and name of the installer. Shipping costs are not included in the warranty coverage. Some accessory items may be shipped in separate packages. - 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 Connections NPT Size (in) SIZE water gas 19-3/8 18-3/8 11-1/4 21-1/8 13-5/8 9-3/8 8-7/8 19-3/8 18-1/8 5-7/8 10-5/8 11-5/8 20-7/8 14-1/8 13-3/8 7-7/8 8-7/8 19-3/8 18-1/8 10-3/4 7-1/2 19-3/8 14-1/8 13-1/4 5-1/8 8-7/8 26-5/8 18-1/8 3-1/8 17-3/4 7-5/8 19-3/8...
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Page 8: Locating Appliance For Correct Vent Distance From Outside Wall Or Roof Termination
LAARS Heating Systems Page 8 NeoTherm Boilers must never be installed on SECTION 2. carpeting. The location for the appliance should be Venting and Combustion Air chosen with regard to the vent pipe lengths and external plumbing and on a level surface. The unit shall be installed such that the gas ignition system components 2.1 Combustion Air... -
Page 9: Intake Combustion Air
Table through the roof. When taken from the wall, it must be Installations in Canada require the use of taken from out-of-doors by means of the LAARS venting material certified to ULCS636. All Gas vents horizontal wall terminal, shown in Table 3. -
Page 10: Locating Vent & Combustion Air Terminals
NeoTherm units are never permitted to share a vent with Category I appliances. Terminals 2.3.1 Side Wall Vent Terminal The appropriate Laars side wall vent terminal must HORIZONTAL INTAKE AND EXHAUST PVC VENT TERMINAL KITS 2" PVC 3" PVC 4"... - Page 11 NeoTherm Boiler Page 11 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);...
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Page 12: Side Wall Vent Terminal
At the time of installation of the side wall vented 2.3.2 Side Wall Combustion Air Terminal gas fueled appliance, the installing plumber or The LAARS side wall combustion air terminal, or gasfitter shall observe that a hard-wired carbon concentric terminal... -
Page 13: Common Vent Test
NeoTherm Boiler Page 13 equipment. The sign shall read, in print no less above, return doors, windows, exhaust fans, than one-half (1/2) inch in size: "GAS VENT fireplace dampers and any other gas burning DIRECTLY BELOW, KEEP CLEAR OF ALL appliance to their previous conditions of use. -
Page 14: Water Connections
LAARS Heating Systems Page 14 SECTION 4. SCHED 40 METAL PIPE CAPACITY FOR 1.50 SPECIFIC GRAVITY UNDILUTED PROPANE Water Connections NOMINAL PIPE SIZE 11" W.C. INLET AND 0.5" W.C. PRESSURE DROP 1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 4.1 Heating System Piping: Hot Supply... -
Page 15: Freeze Protection
NeoTherm Boiler Page 15 Figure 10. Hydronic Piping — Single Boiler (zoning with circulators). connection of an automatic fill valve. appliances where they may be exposed to refrigerated Install a suitable back flow preventer between the air circulation must be equipped with flow control automatic fill valve and the cold water supply. - Page 16 Proper precautions for freeze protection are which could result in leaking or flooding conditions. recommended for boiler installations in areas where the Do not use automotive anti-freeze. Laars danger of freezing exists. recommends a mixture of minimum 20% and maximum...
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Page 17: Recognized Chemicals
NeoTherm Boiler Page 17 Figure 12. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating using Low Loss Header and Zone Valves. must be maintained properly in a heating system, or they 4.4 Recognized Chemicals may become ineffective. Consult the glycol specifications, The following manufacturers offer glycols, or the glycol manufacturer, for information about specific inhibitors, and anti foamants that are suitable for use in... - Page 18 LAARS Heating Systems Page 18 Figure 13. Hydronic Piping — Multiple Boilers (zoning with circulators). Temperature Rise in °F 20°F 25°F 30°F Flow Flow Flow Size feet feet feet BOILER HEAD (FT) AT TEMP RISE PUMP SIZE 20°F 25°F 30°F MODEL INCL.
- Page 19 NeoTherm Boiler Page 19 Figure 14. Hydronic Piping — Multiple Boilers with Indirect DWH Tank (zoning with circulators). Temperature Rise in °F 20°F 25°F 30°F 35°F 40°F Flow Flow Flow Flow Flow Size feet feet feet feet feet 25.5 17.5 10.5 14.5 Temperature Rise in °C...
- Page 20 LAARS Heating Systems Page 20 Figure 15. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones (zoning with circulators).
- Page 21 NeoTherm Boiler Page 21 Figure 16. Hydronic Piping — Heating zones with indirect DWH tank piped with zone pumps (indirect directly off boiler). Boiler pump must shut down during DHW.
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Page 22: Electrical Connections
LAARS Heating Systems Page 22 DIAGNOSTIC DIAGNOSTIC DIAGNOSTIC mode. Each mode will give the user access to DIAGNOSTIC DIAGNOSTIC SECTION 5. different types of information. The menus are accessed Electrical Connections by using the buttons located on the display. 5.2.1 User Mode... -
Page 23: Adjusting The Temperature Display Units In °F Or °C
The sensor is a dual element sensor maximum outdoor temperature the reset curve will use that is limit rated. This sensor must be replaced with to equate to the minimum water temperature. Laars original equipment parts only. The high limit is not adjustable. 5.2.3.2 DHW Limit... -
Page 24: Pump Connections
"DHW temp sensor". The sensor is a dual 5.3 Pump Connections element sensor. The Laars sensor is the only sensor that The boiler pump is wired at the factory (pump can be used with this controller. To connect an aquastat mounted models only). -
Page 25: External Control Connections
NeoTherm Boiler Page 25 points are labeled “outdoor temp sen.” The sensor is not polarity sensitive. 5.7 External Control Connections NeoTherm units are built with a terminal strip to allow the NeoTherm to receive a 4-20mA modulating signal from an external controller (such as a building automation system or multiple boiler control). - Page 26 LAARS Heating Systems Page 26 Figure 21. Wiring Diagram (all sizes).
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Page 27: Wiring Diagram
NeoTherm Boiler Page 27 10. Recheck the water level in the expansion tank. If 5.8 Wiring Diagram (see Figures 20 and 21) the water level exceeds ¼ of the volume of the expansion tank, open the tank drain, and drain to Caution that level. -
Page 28: Burner Operation
LAARS Heating Systems Page 28 boiler resulting from improper setup is not covered by the limited warranty. 6.2.1 Burner Operation differential pressure gauge REQUIRED TOOLS: capable of reading negative 0.01 inches W.C. (0.002kPa), screw drivers, torx bits, combustion analyzer. Using this manual, make sure the installation is complete and in full compliance with the instructions and all local codes. -
Page 29: Boiler Setpoint And Adjustment
NeoTherm Boiler Page 29 6.2.2 Boiler Setup and Adjustment 6.3 Shutting Down the NeoTherm Connect a manometer capable of reading -.005"wc Turn off the main electrical disconnect switch. to the gas valve locations shown in Figure 22. The Close all manual gas valves. positive side of the manometer should be If freezing is anticipated, drain the NeoTherm and connected to the location labeled “air pressure... -
Page 30: Maintenance
LAARS Heating Systems Page 30 Keep the appliance area clear and free from SECTION 7. combustible materials, gasoline, and other Maintenance flammable vapors and liquids. If the appliance is not going to be used for WARNING extended periods in locations where freezing... -
Page 31: Appliance Maintenance And Component Description
7.2 Appliance Maintenance and operation following the instructions in Section 6.2. Component Description Once the boiler is operating check for leaks again and Use only genuine LAARS replacement parts. confirm all fasteners are tight. Check appliance setup according to Section 6.2. Caution Label all wires prior to disconnection when servicing 7.2.3 Appliance Control... -
Page 32: Transformers
LAARS Heating Systems Page 32 from the electrode. Remove the two bolts fastening the Caution electrode to the burner doors. Remove and replace the Black carbon soot buildup on a dirty heat exchanger old flame sensor gasket. Reinstall a new flame sensor can be ignited by a random spark or flame. -
Page 33: Gas Pressure Switches (Optional)
NeoTherm Boiler Page 33 12. Place the appliance in operation according to SECTION 8. Section 6.2 checking all gas connections for leaks. Trouble Shooting Confirm all fasteners are tight. 8.1 Sequence of Operation 7.2.9 Gas Pressure Switches (optional) The NeoTherm appliance is a cold start appliance The high and low gas pressure switches are 24V that should start only on a call for heat from a tank manual reset switches that act to cut power to the gas... - Page 34 LAARS Heating Systems Page 34 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;...
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Page 35: Replacement Parts
Replacement Parts Use only genuine LAARS replacement parts. 9.1 General Information To order or purchase parts for the LAARS NeoTherm, contact your nearest LAARS dealer or distributor. If they cannot supply you with what you need, contact Customer Service (see back cover for... -
Page 36: Parts List
LAARS Heating Systems Page 36... - Page 37 NeoTherm Boiler Page 37...
- Page 38 LAARS Heating Systems Page 38...
- Page 39 NeoTherm Boiler Page 39 Figure 24. Jacket Components.
- Page 40 LAARS Heating Systems Page 40 Figure 25A. Internal Components, sizes 80–210. Figure 25B. Internal Components, sizes 285–500.
- Page 41 NeoTherm Boiler Page 41 Figure 26. Gas Train Components.
- Page 42 LAARS Heating Systems Page 42 Figure 27. Heat Exchanger Components.
- Page 43 NeoTherm Boiler Page 43 Figure 28 Electrical Components.
- Page 44 (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 0904 Document 1218B...