Navien NHB H Series Installation And Operation Manual
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Navien NHB H Series Installation And Operation Manual

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Installation and Operation Manual
NHB-H Condensing Boilers
Model
NHB-055H
NHB-080H
NHB-110H
NHB-150H
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result,
causing property damage, personal injury, or death.
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 neighbor's 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 the
gas supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
ALWAYS read and follow this manual
completely before using the boiler.
Save for future reference.

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  • Page 1 Installation and Operation Manual NHB-H Condensing Boilers Model NHB-055H NHB-080H NHB-110H NHB-150H ALWAYS read and follow this manual completely before using the boiler. Save for future reference. WARNING If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal injury, or death.

  • Page 2: Table Of Contents

    Contents 9. Installing a Common Vent System Important Safety Information 9.1 About the Common Vent System 9.2 Navien Common Vent Collar Kit (Back- 1. About the Boiler draft Damper) 1.1 Included Items 9.3 Starting the Common Vent System 1.2 Accessories 9.4 Connecting and Terminating the Vent...

  • Page 3: Important Safety Information

    Important Safety Information The following Safety Alert Symbols are used DANGER in this manual. They are used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible serious injury or death. This Safety Alert Symbol precedes any safety message about risk of personal injury.
  • Page 4 California law requires the following Prop 65 WARNING warning to be provided: WARNING To prevent death, serious injury, or property damage: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. WARNING To prevent death, serious injury, or property damage: Do not turn on the boiler unless the water ●...

  • Page 5: About The Boiler

    Check the box for each of the the boiler. following items before installing the boiler. Installation & Operation Manual, Quick Installation Manual Navien Manifold System Navien Manifold System User’s Information Manual (for primary zone) (for secondary zone) 2 in Vent Termination Caps...

  • Page 6: Specifications

    3. The net AHRI water ratings shown are based on a piping and pickup allowance of 1.15. Consult Navien before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping system, etc.
  • Page 7 General Specifications Item NHB-055H NHB-080H NHB-110H NHB-150H Dimensions 17.3 in (W) x 12.8 in (D) x 23.8 in (H) Weight 73 lb (33 kg) 80 lb (36 kg) Installation Type Indoor Wall-Hung Venting Type Forced Draft Direct Vent Ignition Electronic Ignition Natural Gas Supply Pressure (from 3.5 in–10.5 in WC source)

  • Page 8: Components

    1.4 Components The following diagram shows the key components of the boiler. Component assembly diagrams and particular parts lists are included in the Appendixes. Intake Air Exhaust Duct Vent Installation Detector (VID) Air Filter Air Vent Connection Flue Duct Pressure Sensor (LWCO) Power Switch Front Panel...
  • Page 9 Ignition Transformer Metal Fiber Premix Burner Mixing Gas Guide Igniter & Flame Rod Primary Heat Exchanger Secondary Heat Exchanger Fan & Motor Air Pressure Sensor (APS) Dual Venturi Gas Valve Gas Connection Space Heating Supply Fitting Space Heating Condensate Trap Return Fitting About the Boiler...

  • Page 10: Dimensions

    1.5 Dimensions The following diagrams show the dimensions of the boiler and the table lists the supply connections. Supply Connections Description Diameter Air Intake 2 in Exhaust Gas Vent 2 in Air Vent Connection Rubber Grommet 1 in Space Heating Return 1 in Condensate Outlet Gas Connection...

  • Page 11: Rating Plate

    ALWAYS leak test the appliance and the gas connections before operating the appliance. ● This boiler cannot be converted from natural gas to propane without a Navien Propane Gas & High Altitude ● Conversion Kit. NEVER attempt a field conversion of this boiler without using the Navien Propane Gas &...

  • Page 12: Installing The Boiler

    Navien will not be responsible for water damages that occur as a result. For more Do not install this boiler in a recreational ●...
  • Page 13 Adequate Venting and Ventilation Adequate Installation Clearances Select a location that requires minimal venting. NOTICE Consider venting restrictions caused by windows, doors, air intakes, gas meters, foliage, and other buildings. For more information about venting, refer Do not install the boiler on carpeting. to “5.

  • Page 14: Mounting The Boiler To The Wall

    2.2 Mounting the Boiler to the CAUTION Wall It is necessary to leave clearance for service Navien NHB-H boilers come with an upper access. mounting bracket that is pre-drilled at 16 in (400 mm) on center for easy installation on standard wall studs.
  • Page 15 3. Install two set screws through the bracket at the WARNING bottom of the boiler to secure the boiler on the wall. The boiler is heavy. Always lift the unit with ● assistance. Be careful not to drop the boiler while lifting or handling it to avoid bodily injury or damage to the unit.

  • Page 16: Installing The System Piping

    3.1 Installing a Space Heating System The primary and secondary heat exchangers of the Navien NHB-H boilers are designed to attain the highest level of heat transfer in a compact design. To accomplish this, the heating water flows through a series of tubes (secondary heat exchanger) and finned tubes (primary heat exchanger), designed to maximize the heat transfer area.
  • Page 17 The Navien NHB-H boiler comes with an air vent and of antifreeze may be harmful to the system and an adapter bushing that must be connected to the will void the warranty.
  • Page 18 Backflow Preventer External LWCO If local codes require a separate LWCO device, Install a backflow preventer valve in the make-up install one separately. Combining the LWCO with water supply to the unit as required by local codes. the air vent simplifies the installation. The following illustration shows an example of a separately Expansion Tank installed external LWCO.
  • Page 19 Method 2 it is pressure lockout setting when using a installed in a manifold system. higher rated valve. If the installed system does not have a Navien All separately purchased pressure ● relief valves must be ASME certified.
  • Page 20 Space Heating Supply The following tables list the specifications for the available pumps and Navien’s manifold system. If you are not using one of the pumps listed below, you must use a circulator with check valve installed at pump outlet or a pump with an integral check valve.
  • Page 21 Pressure Loss Data Curve NHB-055/080H NHB-110H Q[GPM] Q[GPM] NHB-150H Q[GPM] Temperature Rise Conditions 20°F ΔT @ 100% Water 25°F ΔT @ 100% Water 35°F ΔT @ 100% Water Model Flow Rate Head Flow Rate Head Flow Rate Head (GPM) (Ft) (GPM) (Ft) (GPM)
  • Page 22 Pump Sizing for Use with Glycol The use of glycol results in a greater head loss due to its higher viscosity compared to water. Heat transfer is also reduced as the glycol concentration increases. The corrected flow rate and head loss values below must be used when sizing the boiler pump in order to maintain similar performance as using 100% water for the heating system.

  • Page 23: Connecting The Condensate Drain

    Drain Condensate Neutralizer Kit” on page 24). If you choose this option, the Note The Navien NHB-H boiler creates condensation neutralizing agent must be replaced when it operates. This condensation has an acidic periodically. Depletion of the pH of 3-5. Follow all local codes and regulations neutralizing agent will vary, based when disposing of condensate from the boiler.
  • Page 24 ● the neutralizer. If option ‘b’ (p. 23) is selected as the disposal option, the Navien condensate neutralizer kit is recommended. The condensate from the appliance flows through the neutralizing media and increases the pH of the condensate. An increased pH prevents corrosion of the installation’s drainage system and...
  • Page 25 If the pH level is not specified, replace the neutralizing media Figure 1. Horizontal installation when the pH is below 6.0. For replacement media, contact your local Navien distributor. Installing the System Piping...

  • Page 26: Filling The System

    3.3 Filling the System 3.3.1 Make-up Water Connection An external make-up water connection is required. Before filling the boiler, completely unscrew and The illustration below shows an example of an remove the air vent cap to enable the system to fill external water supply connected to the system properly.

  • Page 27: Considerations For System Applications

    The table above shows Read and follow the guidelines listed below when the maximum contaminant levels installing system piping for the Navien NHB-H boiler: allowed. If you suspect that your water is contaminated in any way, discontinue the System application drawings are intended to ●...
  • Page 28 Refer to the “3.6.9 Wiring Diagram - Air Handler” on page 43 for wiring connections. Air Handler Interface The Navien NHB-H boiler can control the operation of an air handler when a thermostat is used in combination with the air handling unit. The Air Handler Interface is designed to stop air handler operation when the boiler’s space heating function...
  • Page 29 3.5.1 Examples of System Applications WARNING Refer to the following examples to properly implement a system for space heating, DHW Do not turn the power on until electrical ● supply, or both. These examples are provided to wiring finished. Disconnect power suggest basic guidelines when you install the boiler before servicing.
  • Page 30 3.5.2 System Application - Zone System with Zone Valves (Primary/Secondary Piping) Additional Zone Zone #2 Zone #1 Zone Valve (Typical) System Pump Air Separator Not to exceed 4 pipe Dia or Max. 12" Make-up Water Backflow Preventer Pressure Reducing Valve Expansion Tank Boiler Pump System application drawings are intended to explain the system piping concept only.
  • Page 31 3.5.3 System Application - Zone System with Pumps (Primary/Secondary Piping) Additional Zone Zone #2 Zone #1 Air Separator Not to exceed 4 pipe Dia or Max. 12" Make-up Water Backflow Preventer Pressure Reducing Valve Expansion Tank Boiler Pump System application drawings are intended to explain the system piping concept only. Note ●...
  • Page 32 3.5.4 System Application - Air Handler System System Pump Air Separator (Boiler Pump) Make-up Water Backflow Preventer Expansion Tank Pressure Reducing Valve Air Flow Air Handler System application drawings are intended to explain the system piping concept only. Note ● Install a filter in the system return to remove foreign objects from the system.
  • Page 33 3.5.5 System Application - DHW System with Indirect Tank (Primary/Secondary Piping) System Pump Air Separator Make-up Water Backflow Preventer Pressure Reducing Valve Expansion Tank Anti-scald Mixing Valve Outlet Indirect Tank Boiler Pump DHW Pump DHW Inlet System application drawings are intended to explain the system piping concept only. Note ●...

  • Page 34: Examples Of Electrical Connections

    3.6 Examples of Electrical To access the PCB, carefully follow the steps below: Connections 1. Turn off the power supply to the boiler. 2. Unfasten the 4 latches (2 at the top and 2 at the bottom) to remove the front cover and gain WARNING access to the internal components.
  • Page 35 3.6.3 Wiring Diagram - Zone Pump System The NHB-H boilers can operate a heating system with up to 3 zones. The following is the wiring diagram for a zone pump system with 3 zones. Without 24VAC Connections (250V 3.15A) CNB1 CON1 CON2 Live...
  • Page 36 With 24VAC Connections (250V 3.15A) CNB1 CON1 CON2 Live Neutral Zone Pump 3 (max. 2.5 A) ZONE3 Pump FUSE (250VAC_10A) Live Neutral ZONE2 Pump FUSE (250VAC_10A) Zone Pump 2 CNC1 CNC4 CNC5 CNC3 CNV3 CNV2 CNV1 CNC6 (max. 2.5 A) ZONE2 ZONE1 ZONE3...
  • Page 37 3.6.4 Wiring Diagram - Zone Pump System with DHW Tank The NHB-H boilers can operate a heating system with up to 2 zones and 1 DHW Tank. The following is the wiring diagram for a zone pump system with 2 zones and 1 DHW Tank. Without 24VAC Connections (250V 3.15A) CNB1...
  • Page 38 With 24VAC Connections (250V 3.15A) CNB1 CON1 CON2 Live Neutral Zone Pump 3 (max. 2.5 A) ZONE3 Pump FUSE (250VAC_10A) Live Neutral ZONE2 Pump FUSE (250VAC_10A) Zone Pump 2 CNC1 CNC4 CNC5 CNC6 CNC3 CNV3 CNV2 CNV1 (max. 2.5 A) ZONE3 ZONE2 ZONE1...
  • Page 39 3.6.5 Wiring Diagram - Zone Valve System The NHB-H boilers can operate a heating system with up to 3 zones. The following is the wiring diagram for a zone valve system with 3 zones. Without 24VAC Connections CNB1 (250V 3.15A) CNC3 CNV3 CNV2...
  • Page 40 With 24VAC Connections CNB1 (250V 3.15A) CNC3 CNV3 CNV2 CNV1 CNB1 LWCO ZONE3 ZONE2 ZONE1 CNC6 CNG1 CNF1 CON1 CON2 Live CNC2 Neutral System Pump (max. 2.5 A) ZONE3 Pump FUSE (250VAC_10A) Zone valve 3 Zone valve 2 Zone valve 1 (max.
  • Page 41 3.6.6 Wiring Diagram - the Navien Smartzone+ The Navien Smartzone+ controller may be used with the NHB-H boilers to operate a heating system with more than 3 zones. When Navien boilers are used with a Navien Smartzone+ zone pump controller, an RS-485 data communication link is established through the Ready-link connection.
  • Page 42 3.6.8 Wiring Diagram - Generic Zone 3.6.7 Wiring Diagram - Generic Zone System with Circulators System with Zone Valves <NHB-H> <NHB-H> CNC1 CNC4 CNC5 CNC3 CNV3 CNV2 CNV1 CNC1 CNC4 CNC5 CNC3 CNV3 CNV2 CNV1 CNC6 CNC6 ZONE3 ZONE2 ZONE1 LWCO ZONE3 ZONE2...
  • Page 43 ZONE1 CNG1 CNF1 CNC2 If you are using the Navien manifold system, connect the pump wires to the system pump. If you are not using the Navien manifold system, connect the pump wires to either the system pump or the boiler pump.
  • Page 44 When connecting the DHW Tank Sensor The Navien Universal Temperature sensor can be used as a DHW Tank Sensor. When installing the Universal Temperature sensor to the boiler, follow these guidelines: This sensor is compatible for use with aquastat immersion wells. Attach an aquastat immersion well to the ●...
  • Page 45 ) to enter the setting menu, and then select 2. ● Space Htg Operation > 6. SH Control Method to select one of the control modes. Use only the Navien Universal Temperature sensor (#GXXX001769). The use of other sensors may ● result in higher water temperatures than expected.

  • Page 46: Connecting The Gas Supply

    Propane Gas 1-ON This boiler cannot be converted from natural ● gas to propane or vice versa without a Navien Before connecting the gas supply, determine ● gas conversion kit. Do not attempt a field the gas type and pressure for the boiler conversion of this boiler without a Navien by referring to the rating plate.
  • Page 47 Navien recommends connecting the boiler as the 6. Connect the gas supply line. first appliance downstream of the gas meter, to 7. Test the supply line, all connection points, and ensure a sufficient gas supply. the boiler for gas leaks.
  • Page 48 BTUs. Also, ensure that the flexible line has no crimps or tight bends in it, as this will restrict gas flow. When using rigid pipe, Navien ● recommends the installation of a union on the gas supply line close to the boiler, to facilitate any future maintenance or service.

  • Page 49: Gas Pipe Sizing Tables

    4.1 Gas Pipe Sizing Tables The following tables are referenced from the 2021 National Fuel Gas Code and are for reference only. Please consult the gas pipe manufacturer for actual pipe capacities. Maximum Natural Gas Delivery Capacity In Cubic Feet (ft ) per Hour (0.60 Specific Gravity;...

  • Page 50: Measuring The Inlet Gas Pressure

    Maximum Liquefied Propane Delivery Capacity In Thousands of BTU/H (0.5 in WC pressure drop) Length (including fittings) Pipe 10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 125 ft 150 ft 175 ft Size...
  • Page 51 To measure the inlet gas pressure: 8. Unfasten the 4 latches (2 at the top and 2 at the bottom) to remove the front cover and gain 1. Shut off the manual gas valve on the gas supply access to the internal components. line.

  • Page 52: Venting For Combustion Air

    5. Venting for Combustion Air Additional Guidelines for Combustion Air The warranty does not cover damage Note caused by air contaminants. WARNING Corrosive Contaminants Muriatic acid/hydrochloric acid Carbon Monoxide Hazard Refrigerant leaks The installation of carbon monoxide detectors Chlorine-type bleaches, detergents, and cleaning may be required in your area for the boiler or other gas fired appliances.

  • Page 53: Venting The Boiler

    5.1 Venting the Boiler The boiler must be properly vented to ensure a constant supply of clean intake air and to ensure that exhaust air is properly removed from living DANGER areas. When venting the boiler, follow these guidelines: Do not install the boiler in areas with This appliance is certified as a Category IV ●...
  • Page 54 Connecting the Pipe to the Vent Collar 1. Measure 2-3/4“ (70mm) from the end of the vent pipe, then draw a mark at that distance. Do not use primer or cement on the Note appliance connection. Mark 2-3/4” (70 mm) from the end of the pipe WARNING 2-3/4”...

  • Page 55: About The Vent Installation Detector

    WARNING WARNING NEVER start the vent run with a street elbow ALWAYS turn on the boiler and test for gas leaks at the vent collar to prevent serious injury or along the exhaust vent using a bubble test kit. death. Using an elbow directly at the collar will If the connections leak, carbon monoxide in the not allow for a tight seal between the appliance flue gas may cause serious injury or death.
  • Page 56 Purpose WARNING The VID’s purpose is to guide the installer to fully insert the vent pipe to a depth of at least 2-3/4” Carbon Monoxide Hazard (70 mm), into the collar. If the vent pipe is not To prevent serious injury or death: properly inserted and installed, it could separate from the collar resulting in flue gas spillage and ALWAYS insert vent pipe 2-3/4”...

  • Page 57: Selecting A Vent Type

    5.3 Selecting a Vent Type WARNING All Navien boilers are Category IV appliances and prepared at the factory to be direct vented (sealed Periodically inspect all vent pipe connections. combustion). Navien recommends direct air vent The VID is not intended and should not be...
  • Page 58 Terminal Clearances for Direct Vent Installations Canadian Direct Vent US Direct Vent Ref Description Installations Installations Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) Clearance to window or door that may be opened 36 in (91 cm) 12 in (30 cm) Clearance to permanently closed window...
  • Page 59 4,000 BTU/H by the Navien warranty. If there is any question Indoor make about the possibility of back drafting in the up air is installation location, use a direct venting system for...
  • Page 60 Terminal Clearances for Non-Direct Vent Installations Canadian Non-Direct US Non-Direct Vent Ref Description Vent Installations Installations Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) 48 in (120 cm) below or Clearance to window or door that may be opened 36 in (91 cm) to side of opening;...

  • Page 61: Selecting Vent Pipe Materials

    † A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. ‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor. Direct exhaust vapors and condensate away from building materials to avoid degradation.

  • Page 62: Measuring Vent Length

    5.5 Measuring Vent Length The following polypropylene vent components are approved for use with this appliance: The maximum vent length when using 2 in exhaust Duravent PolyPro® SW (Rigid) (Certified to ULCS636) ducts is 65 ft (19.5 m). The maximum vent length 2PPS-xxx (2”) or 3PPS-xxx (3“) when using 3 in vent ducts is 150 ft (45 m).

  • Page 63: Terminating The Vent

    5.6 Terminating the Vent The following polypropylene vent components are approved for use as terminations: Before installing the boiler, determine what type of Duravent PolyPro® (Certified to ULCS636) vent termination is appropriate for the installation 2PPS-E90L or 3PPS-E90L (2” or 3” 90° Elbow) location and materials.
  • Page 64 Indoor Boiler Installation Venting Examples WARNING Fire and Explosion Hazard To prevent death, serious injury or property Intake Air damage: Exhaust Gas ALWAYS make sure to follow the provided ● clearance requirements. Failure to do so may result in circulating exhaust ●...
  • Page 65 Two-pipe Vertical Venting - Intake and exhaust Concentric Sidewall Venting ● ● pipes do not have to terminate in the same area. Combustion Air intake Combustion 36" (900 mm) min. Exhaust Gas Air intake Exhaust Exhaust Intake Air 12” (300 mm) min From any Maintain 12"...
  • Page 66 Indoor Boiler Installation Venting Flexible Vent Systems (Polypropylene) ● Examples (continued) Low Profile Two-Pipe Sidewall Venting* ● Exhaust Intake Air (from (from outdoors) appliance) Only VERTICAL installations are Note ● allowed. Horizontal terminations are prohibited. Exterior View The use of proper adapters and ●...

  • Page 67: Setting The Dip Switches

    6. Setting the DIP Switches WARNING Do not remove the front cover unless the power to the boiler is turned off or disconnected. Failure to ● do so may result in electric shock. Configure only the DIP switches that require adjustment according to the instructions in this manual. Do ●...

  • Page 68: Dip Switch 2 (Set Of 8 Switches)

    6.2 Dip Switch 2 (Set of 8 Switches) The DIP SW2 (Set of 8 Switches) on the circuit board configures the gas type, altitude, temperature control modes, country, and enables or disables the space heating thermostat. Switch Function Setting Comment Natural Gas 1-OFF Gas Type...
  • Page 69 When PCB DIP switch 2 #8 is set to On, ensure that CPVC or polypropylene piping is used for exhaust Note ● venting. This unit may be installed at elevations up to 10,100 ft (3,078 m) for use with natural gas and ●...

  • Page 70: Connecting The Power Supply

    We recommend using a surge protector to protect ● and void the warranty. the boiler from power surges. All the Navien NHB-H boilers are supplied If there is a power failure in cold weather areas, ● ● with a factory-installed 5 ft (1.5 m), 3-pronged the freeze prevention system in the boiler will (grounded) plug.
  • Page 71 If you are not using your boiler for a long period of time: 1. Completely drain the water out of the boiler. 2. Disconnect the power supply to the boiler. This prevents your boiler from freezing and being damaged. WARNING Electric Shock Hazard To prevent serious injury or death: ALWAYS label all wires before disconnecting...

  • Page 72: Installing A Cascade System

    Use pumps with integral check valves or install check valves at the pump outlets. ● Navien system supply (Included box)/return (Accessory) Temperature sensor must be installed for ● cascade system operation. Adjust the settings at the main unit as the cascade system uses only the main unit settings.
  • Page 73 System Application #1- Cascade System with Closely Spaced Tees ● Supply Air separator Sub2 Sub1 Main Cold water Backflow preventer Expansion tank Temperature 12” (30 cm) sensors (required) maximum Return Connect the “SH Demand (SH T/T or Zone controller)” to the main unit. Note ●...
  • Page 74 System Application #3- Cascade System with DHW Indirect Tank (for High DHW Demand) ● Air separator Supply Cold water Backflow preventer Expansion tank Indirect tank Sub2 Sub1 Main Aquastat Temperature 12” (30 cm) sensors (required) maximum Return Cold water In this configuration, the full capacity of all boilers will be prioritized to the DHW demand. Note ●...
  • Page 75 System Application #5- Cascade System with DHW Indirect Tank (for Low DHW Demand) ● Supply Indirect Air separator tank Sub2 Sub1 Main Cold water Backflow preventer Expansion tank Aquastat Temperature 12” (30 cm) sensors (required) maximum Return Cold water In this configuration, space heating and DHW can operate simultaneously. Note ●...

  • Page 76: Connecting The Communication Cables

    When plumbing a cascade system, consider the following pipe diameters and flow rates. Note that Up to 16 boilers can be connected with Navien flow rates above 4 ft/s may cause pipe erosion Ready-Link communication cables. Select one of the or velocity noise.

  • Page 77: Installing A Common Vent System

    The Navien Common Vent System* provides an easy Improper venting of the boiler can result in way to install the vent system for up to 8 Navien excessive levels of carbon monoxide and can NHB-H boiler units. By sharing the main intake and lead to serious injury or death.
  • Page 78 6 feet (1.8 m) (minimum). Support the vent pipe with hangers at regular intervals or as required by local codes. Install a Navien Backflow Damper Kit for each ● boiler unit. Use only the damper specified in this manual.
  • Page 79 Adequate Installation Clearances Clean, Debris and Chemical-free Combustion Air NOTICE Do not install the boiler in areas where dust and ● debris may accumulate or where hair sprays, spray detergents, chlorine, or similar chemicals Do not install the boiler on carpeting. are used.
  • Page 80 Cutting and Assembling Common Vent WARNING System Components Carbon Monoxide Hazard Standard tools are suitable for the cutting and assembly of common vent system components. To prevent serious injury or death: Follow the guidelines listed below when working with the components. ONLY use approved venting materials.
  • Page 81 9.1.2 Determining the Length of a 2. Align the pipe with the pipe fitting and twist the pipe a quarter turn as you insert it into the Common Vent System fitting. Twisting the pipe spreads the solvent cement evenly to ensure a solid joint. Follow the instructions listed below to determine the length of a common vent.

  • Page 82: Navien Common Vent Collar Kit (Back-Draft Damper)

    9.2 Navien Common Vent Collar Kit (Back-draft Damper) Length (L) = W + H] The Navien Common Vent Collar Kit includes a backdraft damper preventing the flue gases and Vent Length for NHB-H Boiler Units cold outside air from entering the boiler when the combustion fan is off.

  • Page 83: Starting The Common Vent System

    Maintenance Port 9.3 Starting the Common Vent System Navien Common Vent Collar Kit has a maintenance port to allow you to easily inspect the operating condition of the damper plate. 9.3.1 Common Vent Collar Kit Assembly Follow the instructions below to assemble the Common Vent Collar Kit on the NHB-H boiler unit: 1.
  • Page 84 3. Connect the Common Vent Collar Kit to the 5. Remove the front cover of the boiler, and exhaust duct of the boiler unit. connect the provided VID jumper wire as shown below. You must connect it to the wire with the “VID”...
  • Page 85 Do not use primer or cement on the Note WARNING appliance connection. 1. Measure 1- ” from the end of the vent pipe, NEVER start the vent run with a street elbow then draw a mark at that distance. at the vent collar to prevent serious injury or death.
  • Page 86 9.3.3 Assembling the Wye Joint 1. Assemble the hub wye, the 2” reducer, and the 90º elbow into the common vent. You can also use the hub reducing wye and the 90º elbow to assemble the common vent. Apply the proper Apply solvent cement to the mating surfaces.

  • Page 87: Connecting And Terminating The Vent Pipe

    9.4 Connecting and Terminating the Vent Pipe Refer to the following example to install the common vent system. The installation area should be measured to ensure that sufficient space is available to install the boiler units and the common vent system. Ensure that the common vent system is installed near the boiler units while satisfying all clearance requirements that are specified in this manual as well as the Installation Manuals supplied with the boiler units.
  • Page 88 Direct Venting Canadian Direct US Direct Vent Description Vent Installations Installations Clearance above grade, veranda, porch, deck, or 12 in (30 cm) 12 in (30 cm) balcony Clearance to window or door that may be opened 36 in (91 cm) 12 in (30 cm) Clearance to permanently closed window 12 in (30 cm)*...
  • Page 89 Indirect Venting Canadian Non-Direct US Non-Direct Vent Description Vent Installations Installations Clearance above grade, veranda, porch, deck, or 12 in (30 cm) 12 in (30 cm) balcony 48 in (120 cm) below or Clearance to window or door that may be opened 36 in (91 cm) to side of opening;...

  • Page 90: Setting Up The Common Vent System

    9.5 Setting up the Common Vent 9.6 Common Vent Termination System Clearances WARNING 9.6.1 Direct Vent Application – Vertical Installation Electric Shock Hazard To prevent serious injury or death: 36" (91cm) min. Exhaust ALWAYS disconnect power before servicing. ● 12" Intake (30 cm) NEVER turn power on until the electrical wiring...
  • Page 91 9.6.3 Horizontal Intake and Exhaust In cases where a 12” horizontal clearance is not possible, provide a vertical clearance of at least Termination 36” with the exhaust above the intake but do not exceed 20’ . Exhaust Exhaust Maximum length Intake 20’...

  • Page 92: Installing A Condensate Drain

    9.7 Installing a Condensate Drain To install a condensate drain to the common vent system: Refer to the following examples to install a condensate 1. Form a loop with a drain hose and fix it with a drain hose (field supplied) to the common vent system. tie.

  • Page 93: Maintenance

    9.8 Maintenance 3. Reinstall the gasket and maintenance port cover, and then fix them with a set screw. Periodically check the damper condition inside the Common Vent Collar Kit through the maintenance port to ensure optimal performance of the system. Follow the instructions to check the damper condition and replace the Common Vent Collar Kit if necessary.

  • Page 94: Installation Checklist

    “Troubleshooting” in the User’s Information Manual. If you have additional questions or need assistance with installation, contact Technical Support at 1-800-519- 8794 or 1-949-420-0420, or refer to the technical support section of Navien’s website (www.navieninc.com). Installing the boiler...
  • Page 95 Connecting a Pressure Relief Valve Have you installed an approved pressure relief valve on the boiler? Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the boiler? Is the pressure relief valve in on the space heating outlet? Have you installed the pressure relief valve on the space heating supply pipe near the boiler? Have you installed a discharge drain tube from the pressure relief valve to within 6-12 in (150-300 mm) of the floor?
  • Page 96 Connecting the Power Supply Is the supplied voltage 110-120V AC? Is the boiler plugged into a properly grounded outlet? If you have made a direct power supply connection, have you installed a power switch to facilitate end-user maintenance? Have you checked the polarity of the electrical connection? PCB DIP switch setting (DIP SW2 (Set of 8 Switches)) Gas type: Is switch #1 set correctly for LP (ON) or NG (OFF)? If continuous boiler operation is required, is switch #7 in the up (ON) position?

  • Page 97: Operating The Boiler

    11. Operating the Boiler 11.1 Operating the Boiler for the First Time FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury or loss of life. A.

  • Page 98: Turning The Boiler On Or Off

    11.2 Turning the Boiler On or Off WARNING To turn the boiler on or off, press the Power button To prevent death, serious injury, or property damage: Ensure that the boiler is filled with water ● before turning on the boiler for the first time.

  • Page 99: Start-Up Wizard

    11.3 Start-Up Wizard 8. Set the DHW Call Signal. DHW Thermostat ● The start-up wizard should run the first time the DHW Tank Sensor ● unit is powered on. The wizard must be completed before the boiler can be used. 9.

  • Page 100: Adjusting The System Temperatures

    11.4 Adjusting the System Temperatures Navien NHB-H boilers include multi-temperature zone priority feature that allows the boiler to operate at up to 3 different temperatures. This built-in feature can be accessed from the front panel and eliminates the need for additional accessories that are typically required for multi-temperature applications when used with a combination of heating sources such as baseboard, in-floor heating, and/or an indirect DHW tank.
  • Page 101 11.4.2 Adjusting the Space Heating Temperature (When “3. Zone Priority Setting” is enabled) To adjust the heating temperature: 1. In normal operation mode, rotate the Command dial ( ). The space heating temperature ( ) is highlighted on the screen. 2.
  • Page 102 11.4.3 Adjusting the DHW Indirect 3. Press the Command dial ( ) to select the Supply Temperature indirect DHW temperature ( ). The highlighted section will flash. DANGER Water temperatures at or above 125°F (52°C) can cause instant scalding, severe burns, or death. Before you decide to change the temperature setting, read the following table carefully.

  • Page 103: Resetting The Boiler

    11.5 Resetting the Boiler 11.7 Viewing Basic Information If an error message appears during boiler operation, To view information about the boiler, press the reset the boiler to resolve the problem. Press the Menu button ( ), and then select “1. Status Back button ( ) on the front panel to reset the Information”.

  • Page 104: Setting The Space Heating Operation

    Item Description Item Description System supply Sea Level (0–2,000 ft) 8. Sys Supply Temp temperature (°F) Level 1 (2,000–5,400 ft) 24. High Altitude System return 9. Sys Return Temp Level 2 (5,400–7,700 ft) temperature (°F) Level 3 (7,700–10,100 ft) 10. Outdoor Temp Outdoor temperature (°F) 25.
  • Page 105 2. DHW pump initialized. 2-1. Pump 1 Settings This operation is available If “5. Navien zone cont. ” is only when “2. Zone ● enabled, “3. Zone Priority Settings” is Zone Pump Settings” will be disabled System.
  • Page 106 “Absolute Min” and Absolute Max” temperature settings. Enable or disable heating *** The boost interval time may be set to prevent zones utilizing the Navien interruption in space heating while using the Outdoor Zone Controller. Reset Control mode, due to changes in heat load 5.

  • Page 107: Setting The Dhw Operation (Indirect)

    Press the Back button ( ) to return to the previous NOTICE screen or menu. An outdoor sensor error may occur if the Item Description Outdoor Reset Control mode is enabled without Set the external hot water the outdoor sensor installed tank temperature (°F).

  • Page 108: Viewing Error History

    Rotate the Command dial ( ) to switch between Item Description the list of errors. Press the Command dial ( ) to Select a DHW control select an error to view detailed information. type. 6. DHW control 1. Supply water method 2.

  • Page 109: Setting The Display Options

    Press the Back button ( ) to return to the previous Item Description screen or menu. Select a water pressure unit. Item Description 1. PSI 3. PSI/BAR Setting 2. BAR 1. SH Operation View monthly space Time heating operation logs. Default : PSI ●...
  • Page 110 11.13.2 Viewing Input and Output Press the Back button ( ) to return to the previous screen or menu. Status To view the boiler’s input and output status, press Item Description the Back button ( ) and the Menu button ( 1.
  • Page 111 In the password screen, rotate the Command dial Item Description ) to change numbers and places, and press the 10. Zone V/V 2 Zone 2 valve output Command dial ( ) to enter the password. Status status The factory default password is “1234”. 11.
  • Page 112 Item Description Item Description Set the temperature Set the delay time for the range to turn off space burner to operate after a heating. call for heat is received for 11. Zone T/S Start- 5. SH Burner Off Diff the AHU. Setting range: - 2°F up Delay Time ●...
  • Page 113 Item Description Item Description Turn on or turn off the Set the time for service boiler pump in DHW notification. 18. Boiler pump mode. Setting range: 30 – ● Oper(DHW) Setting range: On/Off 3650 days (10 years) 26. Service Notif ●...
  • Page 114 * The anti-fast cycling time is the duration that the boiler Press the Back button ( ) to return to the previous stops its space heating operation when the space heating screen or menu. supply or return temperatures reach the set values for boiler operation stop temperatures.
  • Page 115 Item Description Item Description Select this option on the The number of units 6. Number of Oper- Main unit of a cascade currently operating in the Unit system to end cascade cascade system. operation. View the operating status Enter Cascade system ●...
  • Page 116 Press the Back button ( ) to return to the previous Press the Back button ( ) to return to the previous screen or menu. screen or menu. Item Description Item Description Turn on or turn off Test the fan operation by the remote control manually changing the capabilities via the...
  • Page 117 Item Description Item Description Test the DHW (zone 1) Test the zone 3 valve pump operation. operation. The DHW (zone 1) The zone 3 valve is ● ● pump is turned on as turned on as soon 5. DHW (zone 1) soon as you enter the as you enter the test Pump...
  • Page 118 11.13.7 Setting the Special Operation 11.13.8 Operating in Air Purge Mode Modes To operate the boiler in air purge mode, press the Back button ( ) and the Menu button ( To operate the boiler in special operation modes, simultaneously for 3 seconds, and then select “8. Air press the Back button ( ) and the Menu button Purge Mode”.

  • Page 119: Understanding Error Codes

    11.14 Understanding Error Codes When an error code appears on the front panel, refer to the following chart for a definition and possible remedy for the situation. Error Code Reason Self-diagnostic/Action E001 Heat Exchanger Overheat Check for proper system flow. E003 Ignition Failure Check gas supply valve and igniter.

  • Page 120: Appendixes

    Navien. Gas & High Altitude conversion using any other parts will result in extremely ALLOW the boiler to cool if it has been ●...
  • Page 121 Included Items: Please confirm the installation elevation Note by using the provided QR code to Gas Orifice (Table 1) access the following website (https:// ● www.navieninc.com/elevation) and Gas Pressure and Conversion Kit Number Labels ● entering the proper zip/postal code. NHB-055/080H Orifice Identification Type 5,400-...
  • Page 122 Procedure: 7. Remove the PCB assembly. The procedure below can be applied Note to both Propane conversion and High Altitude conversion. Distinguish the kit supplied with the boiler before installing. 1. Turn off the power, gas, and water supply to the boiler.
  • Page 123 B: Remove the valve, causing potential severe personal 4 screws here injury, death or substantial property damage. Navien NHB-H boilers are shipped ready to fire natural gas ONLY. Location A: Remove Gasket 2 screws here...
  • Page 124 12. Remove the Gas Orifice, ensure that the gasket Please confirm the installation Note ● is properly seated inside the port, and then elevation by using the provided QR install the new Gas Orifice for use with Propane code to access the following website gas.
  • Page 125 The DIP SW1 (Set of 6 Switches) on the circuit board WARNING configures the operation status and model settings. High fire Low fire To prevent serious injury or death: Model Fuel ALWAYS check the panel DIP SW2 #1 (Set of ●...
  • Page 126 d. Activate multiple zones and set the boiler c. Activate multiple zones and set the boiler to operate at 2-stage D. MAX mode (refer to operate at 1-stage MIN mode (refer to to “11.13.7 Setting the Special Operation “11.13.7 Setting the Special Operation Modes”...
  • Page 127 17. Once the CO or offset values have been confirmed, apply the included conversion stickers to show that the appliance has been converted to Propane Gas or High Altitude. Place these labels adjacent to the rating plate as shown in Figure 11. Min.

  • Page 128: Wiring Diagram

    12.2 Wiring Diagram Ground Burner Igniter Main Gas Valve2 CNI1 CND1 CNJ1 CNA1 Main Gas Valve1 CNR1 Water Pressure Sensor Zone AC24V CNO1 Valve1 Zone AC24V Valve2 LWCO Zone AC24V Valve3 AC24V Cascade Line(RS-485) CNK1 *T/S_4(DHW) T/S INPUT AC24V T/S INPUT *T/S_1 AC24V T/S INPUT...

  • Page 129: Ladder Diagram

    12.3 Ladder Diagram AC INPUT(AC 120V) AC INPUT(AC 120 V) LIVE NEUTRAL LIVE NEUTRAL Terminal Board Relay 1 Boiler Pump Dual Venturi Relay 5 Relay 2 Relay 6 FILTER ZONE1 Pump (DHW Tank) Relay 3 Igniter ZONE2 Pump Relay 4 Speed Control ZONE3 Pump (System)

  • Page 130: Outdoor Temperature Sensor

    When necessary, shielded cable may be used. Make sure wiring connections are secure before ● closing the cap. Navien Outdoor Temperature Sensor Kit The sensor is a water resistant device. ● Any damage to the device may require the ●...
  • Page 131 Outdoor Outdoor High MIN Low MIN °F °C Absolute High Mass Radiant Low Mass Radiant Cast Iron Baseboard Custom Radiator Finned Tube Baseboard Fan Coil Absolute °F 113 104 95 86 77 68 59 50 32 23 14 -4 -13 °C 45 40 35 30...

  • Page 132: Component Assembly Diagrams And Parts Lists

    12.6 Component Assembly Diagrams and Parts Lists 12.6.1 Case Assembly 132 Appendixes...
  • Page 133 Description Service Code Part # Remark Air Pressure Sensor 30021100B 30021100* 24V Power Transformer 30025710A 30025710* Screw (M4X10) 20049000A 20049000* Intake Air Filter 30016248B 30016248* Main PCB 30033380A 30031846* Vent Installation Detector 30024849A 30024849* Front Panel 30019664C 30019664* Front Cover 30032869A 30031942* Screw (M4X6)
  • Page 134 12.6.2 Heat Exchanger and Waterway Assembly 134 Appendixes...
  • Page 135 Description Service Code Part # Remark Siphon Pipe Clip 20007833A 20007833* 20061755A 20061755* NHB-55/80H Siphon Hose 20061754A 20061754* NHB-110/150H 30031953A 30031953* NHB-55/80H Siphon 30031992A 30031992* NHB-110/150H Condensate Trap Clip 20048219A 20048219* Condensate Trap Cap 20048216B 20048216* Condensate Trap Gasket 20048240A 20048240* 30014065A 30014065*...
  • Page 136 Description Service Code Part # Remark Exhaust Thermistor 30009478A 30009478* 20007853A 20007853* NHB-55/80H Fastener 20017724A 20017724* NHB-110/150H Screw (S10A, M4X8) 20024322A 20024322* Bracket 20033938A 20033938* Screw (STS410, 4X16) 20037260A 20037260* Screw (STS410, 4X12) 20006487A 20006487* Screw (STS410, 4X18) 20023655A 20023655* 30032871A 30031943* NHB-55H...
  • Page 137 12.6.3 Fan(Gas) Assembly Appendixes...
  • Page 138 Description Service Code Part # Remark Gas Valve 30011586B 30011586* Gas Connector 20027149A 20027149* Gas Inlet Adapter 20027748A 20027748* Screw (SCM435, M4X12) 20006390A 20006390* O-ring 20058408A 20058408* Dual Venturi 30027149B 30027149* 30031949A 30031949* NHB-55/80H Reducer 30024970A 30024970* NHB-110/150H 30031906A 30031906* NHB-55/80/110H Intake Pipe 30024867A...

  • Page 139: Requirements For The State Of Massachusetts

    12.7 Requirements for the State 4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled of Massachusetts equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage NOTICE BEFORE INSTALLATION installed in accordance with the provisions of 248 CMR 5.09 and 5.12.

  • Page 140: Limited Warranty Navien, Inc

    1 year limited-labor warranty (“Warranty”) Retail Price (MSRP), at the time the warranty claim covers defects in materials or workmanship when is approved by Navien, as indicated in the following the Navien NHB-H Boiler (“Product”) is installed Coverage Table for Heat Exchangers Only. This...
  • Page 141 No one is authorized to make any other warranties smell or taste of water that have an adverse reaction on behalf of Navien. Some states do not allow the on the unit, etc. exclusion or limitation of incidental or consequential Damage or problems caused by gas flow issues, ●...
  • Page 143 Installation and Operation Manual NHB-H Condensing Boilers Getting Service If your boiler requires service: All repairs require pre-authorization by Technical Support. ● Request for your installer or any licensed professional to contact Technical Support at ● 1-800-519-8794 Option 2 once at the installation site. A short list of independent service providers in your area can be found on the website: ●...

This manual is also suitable for:

Nhb-055hNhb-080hNhb-110hNhb-150hNhb-h series

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