Laars NeoTherm NTH Installation And Operation Instructions Manual
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Laars NeoTherm NTH Installation And Operation Instructions Manual

Modulating boiler and water heater
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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 080–850 MBTU/h
Water Heater
Model NTV
Sizes 150–850 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 1218F
®

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  • Page 1 Installation and Operation Instructions Document 1218F Installation and Operation Instructions for NeoTherm ® Modulating Boiler Model NTH Sizes 080–850 MBTU/h Water Heater Model NTV Sizes 150–850 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.

  • Page 2: Table Of Contents

    LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. Section 6B. General Information Water Connections - NTV Water Heater Introduction ............4 6B.1 NTV Water Quality ........29 Model Identification ......... 4 6B.2 Piping Requirements ........29 Appliance Overview ......... 4 6B.3...

  • Page 3: Section 1

    NeoTherm Boilers and Water Heaters Page 3 SECTION 9. SECTION 11. Modes of Operation Maintenance Hydronic Heating Demand ......40 11.1 System Maintenance ........46 Hydronic Heating with Outdoor Reset ... 40 11.2 Appliance Maintenance and Component Description ............ 46 Hydronic Heating with Domestic Hot Water (DHW) Priority ........

  • Page 4: General Information

    NeoTherm units must be installed in accordance with precedence over the general instructions contained herein. the procedures detailed in this manual, or the LAARS All electrical wiring is to be done in accordance Heating Systems warranty will be voided. The...
  • Page 5 NeoTherm Boilers and Water Heaters Page 5 Figure 1. Location of Components, Sizes 80–105. Figure 2. Location of Components, Sizes 150-210.
  • Page 6 LAARS Heating Systems Page 6 Figure 3. Location of Components, Size 285. Figure 4. Location of Components, Size 399.
  • Page 7 NeoTherm Boilers and Water Heaters Page 7 Figure 5. Location of Components, Size 500. Figure 6. Location of Components, Size 600.
  • Page 8 LAARS Heating Systems Page 8 Figure 7. Location of Components, Sizes 750 and 850.

  • Page 9: Warranty

    The NeoTherm is shipped in a single crate with the are covered by a limited warranty. The owner should following standard components packed with the complete the warranty registration at www.Laars.com. appliance (see Figure All warranty claims must be made to an authorized A.
  • Page 10 LAARS Heating Systems Page 10 AIR INLET VENT SIZE 25 64 19½ 49 38¼ 97 2 5.1 2 5.1 25 64 19½ 49 38¼ 97 2 5.1 2 5.1 25 64 19½ 49 38¼ 97 3 7.6 3 7.6 199/ 210 25 64 26¾...

  • Page 11: Locating The Appliance

    NeoTherm Boilers and Water Heaters Page 11 SECTION 2. Locating the Appliance 2.1 Locating the Appliance SUGGESTED SERVICE ACCESS CLEARANCE APPLIANCE SURFACE INCHES NeoTherm is for indoor installations only. Left Side The appliance should be located to provide Right Side clearances on all sides for maintenance and inspection.

  • Page 12: Venting And Combustion Air

    The combustion air can be taken through the wall, or optional optional included through the roof. When taken from the wall, it must be taken from out-of-doors by means of the LAARS included horizontal wall terminal, shown in Table(s) 3. See...

  • Page 13: Venting

    NeoTherm Boilers and Water Heaters Page 13 Use ABS, PVC, CPVC or galvanized pipe for the The unit’s vent can terminate through the roof, or combustion air intake (see Table 4), sized per Table through an outside wall. Route the intake to the boiler as directly as possible. Seal When using PVC/CPVC for vent material, venting all joints.

  • Page 14: Venting Requirements Unique To Canada

    Ensure that the drain, drainpipe, and vent system, Laars suggests the use of a coupler fitting anything that will come in contact with the from the certified vent system into which the vent...

  • Page 15: Side Wall Combustion Air Terminal

    (see Table 3), must be used when Massachusetts Rules and regulations 248 CMR 5.08 the heater takes air from a side wall. Contact Laars for 1. Installation of Carbon Monoxide Detectors AL29-4C termination fittings. Consider the following At the time of installation of the side wall vented...
  • Page 16 LAARS Heating Systems Page 16 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 17: Common Vent Test

    NeoTherm Boilers and Water Heaters Page 17 equipment. The sign shall read, in print no less than one-half (1/2) inch in size: "GAS VENT DI- RECTLY BELOW, KEEP CLEAR OF ALL OBSTRUCTIONS". 4. Inspection The state or local gas inspector of the side-wall horizontally vented gas fueled appliance shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and...

  • Page 18: Gas Supply And Piping

    LAARS Heating Systems Page 18 deficiencies which could cause an unsafe condition. SECTION 4. 3. Insofar as it is practical, close all building doors and Gas Supply and Piping windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the 4.1 Gas Supply and Piping...

  • Page 19: Pump Requirements

    NeoTherm Boilers and Water Heaters Page 19 SECTION 5. NEOTHERM NATURAL GAS Pump Requirements REQUIRED TO SIZE PIPING: CU FT SIZE / HR. Measure linear distance from meter outlet to last boiler. Add total input of all boilers and divide by 5.1 NeoTherm Boiler Flow and Head 1000 to obtain cu ft / hr required.

  • Page 20: Section 6A

    Figures 17-19. Section 6 is divided into two parts. The first is NeoTherm NTH models can be ordered with or for NTH models and is Section 6A. The second without a pump included. is for NTV models and is Section 6B. Refer to...

  • Page 21: Freeze Protection

    Do not use automotive antifreeze. To help prevent freezing, Laars recommends the use of inhibited glycol concentrations between 20% and 35% glycol. Typically, this concentration will serve as burst protection for temperatures down to approximately -5°F (-20°C).
  • Page 22 LAARS Heating Systems Page 22 Figure 15. Hydronic Piping — Single Boiler (zoning with circulators).
  • Page 23 NeoTherm Boilers and Water Heaters Page 23 Figure 16. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating using Low Loss Header and Zone Valves.
  • Page 24 LAARS Heating Systems Page 24 Figure 17. Hydronic Piping — Multiple Boilers (zoning with circulators).
  • Page 25 NeoTherm Boilers and Water Heaters Page 25 Figure 18. Hydronic Piping — Multiple Boilers with Indirect DWH Tank Piped from System Loop.
  • Page 26 LAARS Heating Systems Page 26 Figure 19. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones (zoning with circulators).
  • Page 27 NeoTherm Boilers and Water Heaters Page 27 Figure 20. Hydronic Piping — Heating zones with indirect DWH tank piped with zone pumps (indirect directly off boiler). Boiler pump must shut down during DHW.
  • Page 28 LAARS Heating Systems Page 28 Figure 21. Hydronic Piping, multiple boilers with indirect DWH off one boiler. Boiler pump must shut-down during DHW.

  • Page 29: Section 6B

    NeoTherm Boilers and Water Heaters Page 29 SECTION 6B. 6B.2 Piping Requirements Water piping should be supported by suitable Water Connections - NTV Water Heater hangers and floor stands. Do not support piping with the appliance. Due to expansion and contraction of copper Section 6 is divided into two parts.

  • Page 30: Cold Water Make-Up

    LAARS Heating Systems Page 30 6B.3 Cold Water Make-Up 6B.5 NTV Suggested Piping Schematics The cold water make-up may be connected to the Figures 23-26 show suggested piping tank or to the inlet of the boiler as shown in Figures 23- configurations for NTV boilers.
  • Page 31 NeoTherm Boilers and Water Heaters Page 31 NOTES: 1. Optional CWMU & Recirc. line location. 2. Locate NTV DHW sensor or remote aquastat well in lower 1/3 of tank. 3. Back flow preventer may be required - check local codes. 4.

  • Page 32: Electrical Connections

    LAARS Heating Systems Page 32 SECTION 7. Important Note: DO NOT MAKE/BREAK NEOTHERM LINE VOLTAGE TO SIGNAL CALL FOR HEAT. A “call Electrical Connections for heat / end call for heat” MUST be connected to the field interlock terminals. Some NeoTherm components...

  • Page 33: Pump Connections

    NeoTherm Boilers and Water Heaters Page 33 7.4 Hydronic Call for Heat BOILER PUMP CONNECTIONS RATINGS Connect the call for heat to terminal block 7 (Boiler, System Pump and (TB7), connections labeled "T-T or interlock" in the SIZES VOLTS PHASE AMPS DHW Pump Connections) control panel.
  • Page 34 LAARS Heating Systems Page 34 Figure 28. Lead-Lag / Cascading Wiring Connections.

  • Page 35: Wiring Diagrams

    NeoTherm Boilers and Water Heaters Page 35 7.11 Wiring Diagrams (see Figures 29 and 30) Caution Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing Figure 29. Ladder Diagram.
  • Page 36 LAARS Heating Systems Page 36 Figure 30. Wiring Diagram (all sizes).

  • Page 37: Display Navigation

    NeoTherm Boilers and Water Heaters Page 37 Once the value is adjusted the NEXT or DONE button SECTION 8. can be pressed. The DONE button returns you to the NeoTherm Control Setup Home screen. The NEXT button increments the display and Operation to the next item in the menu structure.

  • Page 38: Modulation Control

    LAARS Heating Systems Page 38 Prepurge timer is started once the prepurge RPM is 8.5 Anti-Short Cycle (ASC) achieved. The anti short cycle period is started whenever the Pre ignition time of 2 seconds to check the flame gas valve turns off. This period is to help prevent short sensor operation and status.

  • Page 39: Lead Lag Setpoint

    NeoTherm Boilers and Water Heaters Page 39 will help reduce the chance of short cycling. DANGER 8.12.5 Lead Lag Base Load Setting • Water temperature over 125°F (52°C) can cause The lead lag system uses a base load setting that is severe burns instantly or death from scalds.

  • Page 40: Modes Of Operation

    LAARS Heating Systems Page 40 SECTION 9. once the fan RPM reaches a preset level. The trial for ignition period follows once the start-up RPM of the fan Modes of Operation is reached. The trial for ignition period lasts 4 seconds during which, the direct spark ignition system and gas valve are energized.

  • Page 41: Hydronic Heating Using Local Lead-Lag/Cascading Feature

    NeoTherm Boilers and Water Heaters Page 41 setpoint is used to limit the maximum water temperature All three boilers will continue to fire simultaneously at leaving the boiler only. The modulation rate is equal input rates or… controlled by a 4-20mA (0-10Vdc using converter) Modulation rate approaches minimum firing rate signal supplied by an external control.

  • Page 42: Domestic Hot Water Heating Using External Modulation Control

    LAARS Heating Systems Page 42 water temperature at the heat exchanger outlet. Once the The ignition process consists of a prepurge, trial for DHW call is supplied the control starts the boiler and ignition, and run period. The prepurge period starts on a DHW pumps and begins the ignition process.

  • Page 43: Operating Instructions

    NeoTherm Boilers and Water Heaters Page 43 13. Check gauge for correct water pressure and also SECTION 10. 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 10.1Filling the Boiler System system is ready for operation.

  • Page 44: Boiler Setup And Adjustment

    LAARS Heating Systems Page 44 label and turn on gas and electrical power to Table 16. If the CO is not within the range appliance. shown, adjustments may be made. To adjust the NeoTherm will enter the start sequence. Blower...
  • Page 45 NeoTherm Boilers and Water Heaters Page 45 80–285 750, 850 Figure 33B. NeoTherm Gas Valves (600, 750 and 850). Figure 33A. NeoTherm Gas Valves (285, 399 and 500).

  • Page 46: Maintenance

    Turn on the 120 Volt power. Place the unit in operation following the instructions in Section10. Once Component Description the boiler is operating check for leaks again and confirm Use only genuine LAARS replacement parts. all fasteners are tight. Check appliance setup according to Section Caution 11.2.3 Appliance Control...

  • Page 47: Ignitor Assembly

    NeoTherm Boilers and Water Heaters Page 47 appliance. Remove the front door to the appliance and replace the old ignitor assembly gasket. Reinstall a new the control panel plastic bezel. Remove all wire ignitor assembly in the reverse order if the old assembly connections from the control board.

  • Page 48: Transformer With Integral Circuit Breaker

    LAARS Heating Systems Page 48 11.2.6 Transformer with Integral Circuit Caution Breaker Black carbon soot buildup on a dirty heat exchanger The appliance has a 24Vac transformer with can be ignited by a random spark or flame. To integral 4 amp circuit breaker installed for supplying the prevent this from happening, dampen the soot control voltage required for the appliance only.

  • Page 49: Gas Pressure Switches (Optional)

    After the reduced rate start time is over, the unit require no additional parts, only proper gas valve will be in normal operation. Firing rate will adjustment. Please contact the Laars factory for specific modulate based on the heating load via the information regarding the gas conversion of an temperature controller settings and readings.
  • Page 50 LAARS Heating Systems Page 50 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 51 NeoTherm Boilers and Water Heaters Page 51 CODE# PROBLEM PROBABLE CAUSE SOLUTION ALERT CODES Maximum cycle count Control operates correctly, was reached however the cycle count will not increment any higher than 999,999 cycles Replace controller or adjust the count using blue display Maximum hours count Control operates correctly, was reached...

  • Page 52: Replacement Parts 13.1 General Information

    LAARS Heating Systems Page 52...
  • Page 53 NeoTherm Boilers and Water Heaters Page 53...
  • Page 54 LAARS Heating Systems Page 54...
  • Page 55 NeoTherm Boilers and Water Heaters Page 55...
  • Page 56 LAARS Heating Systems Page 56 Figure 35. Jacket Components.
  • Page 57 NeoTherm Boilers and Water Heaters Page 57 Figure 36A. Internal Components, Sizes 80–210. Figure 36B. Internal Components, Sizes 285–600.
  • Page 58 LAARS Heating Systems Page 58 Figure 36C. Internal Components, Sizes 750-850.
  • Page 59 NeoTherm Boilers and Water Heaters Page 59 Figure 37A. Gas Train Components, Sizes 80-500.
  • Page 60 LAARS Heating Systems Page 60 Figure 37B. Gas Train Components, Sizes 600-850.
  • Page 61 NeoTherm Boilers and Water Heaters Page 61 Figure 38. Heat Exchanger Components.
  • Page 62 LAARS Heating Systems Page 62 Figure 39. Electrical Components.
  • Page 63 NeoTherm Boilers and Water Heaters Page 63...
  • Page 64 (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 1101 Document 1218F...

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