Navien NPE-180A2 Installation Manual
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Navien NPE-180A2 Installation Manual

Condensing water heaters
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Installation Manual
NPE Condensing Water Heaters

Getting Service

If your water heater requires service, you have several options for getting service:
Contact Technical Support at 1-800-519-8794 or on the website: www.navieninc.com.
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For warranty service, always contact Technical Support first.
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Contact the technician or professional who installed your water heater.
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Contact a licensed professional for the affected system (for example, a plumber or electrician).
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When you contact Technical Support, please have the following information at hand:
Model number
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Serial number
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Date purchased
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Installation location and type
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Error code, if any appears on the front panel display
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Navien, Inc.
800.519.8794 www.navieninc.com
20 Goodyear, Irvine, CA 92618
T H E
L E A D E R
I N
C O N D E N S I N G
Version: 1.0 (Feb. 2021)
T E C H N O L O G Y

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Summary of Contents for Navien NPE-180A2

  • Page 1 Installation location and type ● Error code, if any appears on the front panel display ● Version: 1.0 (Feb. 2021) Navien, Inc. 800.519.8794 www.navieninc.com 20 Goodyear, Irvine, CA 92618 T H E L E A D E R C O N D E N S I N G...
  • Page 2 Installation Manual NPE Condensing Water Heaters Model NPE-180A2 NPE-210A2 NPE-240A2 NPE-150S2 NPE-180S2 NPE-210S2 NPE-240S2 Keep this manual near this water heater for future reference whenever maintenance or service is required. * The wetted surface of this product contacted by * Lead Free...
  • Page 3 4.1 Connecting Water Supplies 4.2 Connecting the Communication Cables 5. Installing a Common Vent System 64 5.1 About the Common Vent System 5.2 Navien Common Vent Collar Kit (Back- draft Damper) 5.3 Starting the Common Vent System 5.4 Connecting and Terminating the Vent Pipe 5.5 Installing a Condensate Drain...
  • Page 4 1. Safety Information The following safety symbols are used in this manual. Read and follow all safety instructions in DANGER this manual precisely to avoid unsafe operating conditions, fire, explosion, property damage, personal injury, or death. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in severe injury or death.
  • Page 5 California law requires the following Prop 65 warning to be provided: WARNING WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov CAUTION Do not turn on the water heater unless the ● Do not store or use gasoline or other ● water and gas supplies are fully opened. flammable liquids near this water heater.
  • Page 6 DANGER DANGER This water heater’s water temperature is set to 120°F (49°C) at the factory for your safety and comfort. Increasing the temperature increases the risk of accidental scalding. 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 charts carefully.
  • Page 7 2. About the Water Heater 2.1 Items Included When you open the box, you will find the following items with the water heater. Check the box for each of the following items before installing the water heater. NPE-A2 Plumb Easy Condensate 3 Valve Set Neutralizer...
  • Page 8 2.3 Specifications The following table lists the specifications for the water heater. Additional specifications about water, gas, electric, and air supplies (venting) appear in the Installation section. Item NPE-180A2 NPE-180S2 NPE-210A2 NPE-210S2 NPE-240A2 NPE-240S2 NPE-150S2 Heat 18,000- Natural Gas, Capacity...
  • Page 9 2.4 The Front Panel The front panel allows you to adjust the water temperature and view the operating status or error codes. Remove the protective sheet from the front panel before using it. Recirculation/ Space Heating Combustion/Error Displays recirculation (Always On/Intelligent/ Displays combustion/ Weekly/HotButton) and error status.
  • Page 10 Flow Sensor (APS) Front Panel Buffer Tank Condensate Trap Circulation Pump Gas Valve PCB Box Water Adjustment 2-Way Valve Valve DHW Supply Fitting Water Inlet Filter Gas Inlet Fitting Condensate Drain Recirculation Inlet Fitting [NPE-180A2/ 210A2/ 240A2] About the Water Heater...
  • Page 11 Exhaust Duct Vent Installation Detector Intake Air Duct Exhaust Limit Temperature Sensor Intake Air Filter Fan Motor Exhaust Body Burner High Limit Fuse Ignition Transformer Burner Single Venturi Igniter/Flame Rod Primary Heat Exchanger Gas Pipe Secondary Heat Exchanger Air Pressure Sensor (APS) Front Panel Condensate Trap...
  • Page 12 Exhaust Duct Vent Installation Detector Exhaust Limit Temperature Sensor Intake Air Duct Exhaust Body Intake Air Filter Fan Motor Burner High Limit Fuse Ignition Transformer Burner Dual Venturi Igniter/Flame Rod Primary Heat Exchanger Gas Pipe Secondary Heat Exchanger Air Pressure Sensor (APS) Front Panel Condensate Trap...
  • Page 13 Supply Connections 1.5 in (38 mm) 14.3 in (364 mm) 4.5 in (115 mm) 6.7 in (170 mm) 2.3 in (60 mm) 3.0 in (77 mm) 8.3 in (212 mm) 17.3 in (440 mm) [NPE-180A2/ 210A2/ 240A2] About the Water Heater...
  • Page 14 Supply Connections Description Diameter Air Intake 2 in Exhaust Gas Vent 2 in Hot Water Outlet Gas Inlet Condensate Outlet Cold Water Inlet Overhead View Supply Connections 1.5 in (38 mm) 14.3 in (364 mm) 4.5 in (115 mm) 6.7 in (170 mm) 2.3 in (60 mm) 11.3 in (289 mm) 17.3 in (440 mm)
  • Page 15 2.7 Rating Plate Water Heaters come from the factory configured for use with Natural Gas (NG). Before starting the installation, check the rating plate located on the side of the water heater to ensure that the water heater matches the gas type, gas pressure, water pressure, and electrical supply available in the installation location.
  • Page 16 Proper maintenance of the water heater is required Once/Year Hard (61-120 mg/L) Softener** when water quality does not meet EPA standards. or Navien Damage caused by poor water quality is not 7-9 grains/gal PeakFlow is Hard covered under warranty. The following table shows...
  • Page 17 Installing the water heater in a location without a Do not enclose the vent termination. drain will void the warranty and Navien will not be ● responsible for water damages that occur as a result. Install the exhaust vent in an area that is free from ●...
  • Page 18 Adequate Installation Clearances In commercial locations, do not install the water ● heater in areas with greasy fumes or heavy amounts of steam or take measures to prevent Install the water heater in an area that allows fumes and steam from entering the water heater. for service and maintenance access to utility connections, piping, filters, and traps.
  • Page 19 1. Affix the bracket securely to the wall and ensure that it is level and that it can support the weight Navien water heaters come with an upper mounting of the water heater. bracket that is pre-drilled at 16 in on center for easy installation on standard wall studs.
  • Page 20 This water heater cannot be converted from ● natural gas to propane or vice versa without a Navien gas conversion kit. Do not attempt a field conversion of this water heater without a Navien gas conversion kit. Doing so will result in dangerous operating conditions and will void the warranty.
  • Page 21 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 Supply union on the gas supply line close to the water heater, to facilitate any future maintenance or service.
  • Page 22 Typical Propane Gas piping examples: Gas Regulator 12 in W.C. Gas Regulators Full Size (2 Stage) Gas Pipe Pipe Low Pressure Regulator (before entering High home or Pressure building) Gas Tank Regulator Full size Gas Pipe Gas Tank Full Size Gas Pipe [Single Regulator System] [2 Stage System with Multiple Regulators...
  • Page 23 3.3.1 Gas Pipe Sizing Tables (Referenced from 2012 National Fuel Gas Code) These tables 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; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft3 ratings.
  • Page 24 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 80 ft 100 ft 125 ft 150 ft 175 ft 200 ft 250 ft Size...
  • Page 25 2. Open a hot water faucet. The water heater 8. When the water heater reaches its maximum should turn on and the gas in the gas supply firing rate, check the inlet gas pressure reading line will be purged. on the manometer. The gas pressure must fall within the ranges specified on page 23.
  • Page 26 Instruct the water heater owner that the filter must be cleaned periodically to maintain proper water flow. The following is a typical water piping example ● for NPE-180A2/210A2/240A2 models. Union Pressure Full port Relief Valve...
  • Page 27 3.4.2 Selecting a Recirculation Mode Combination Water Heating and Space ("A2" Model Only) Heating On all “A2“ model Navien water heaters, you can choose from two pre-heating modes: internal When using the water heater for both water recirculation mode or external recirculation mode.
  • Page 28 Internal Recirculation Mode ("A2" Model For more information about the Note ● Recirculation settings, refer to "6.4.1 Only) Setting the Recirculation Mode" on page 83. To use the internal recirculation mode: Internal Recirculation is available ● 1. Connect the water supply. only on A2-type models.
  • Page 29 83. 1. Connect the water supply to support If the A2-type model requires ● recirculation. Refer to the "[NPE-180A2/ 210A2/ an external pump, follow the 240A2]" diagram on page 25. instructions in "3.4.3 External Pump Wire Connection" on page 29 2.
  • Page 30 3.4.3 External Pump Wire Connection 2. Locate the power switch on the right side of the front panel and switch the system off. An external pump may be connected to the water heater for recirculation applications. When selecting a circulator, it shall be sized to maintain a flow of 2-4 GPM through the water heater.
  • Page 31 Domestic Cold Water Domestic Hot Water Domestic Recirculation Return [Type 2. Recirculation Using a Second Pump (NPE-A2 Models, Navien Internal Pump & External Pump)] 3.4.4 Navien HotButton Kit Condensate The NPE-A2/S2 series water Domestic Hot Water...
  • Page 32 Included Item Wiring Connection Table Terminal Wiring Connection 12 V Contacts for wireless push Signal Signal1 button or motion sensor connection HotButton Controller Signal2 Push Button Switch Contact #1 (Not polarity Push Button Switch Contact #2 sensitive) Items Not Included Contacts for temperature Sensor I sensor connection...
  • Page 33 Use UTP cables or cables with a diameter greater than AWG 24. ● Make sure that the total cable length does not exceed 328 feet (100 meters). ● Additional push button switches (#GXXX001426) and wall plates (#GXXX001427) can be purchased ● through Navien. Installing the Water Heater...
  • Page 34 HotButton DIP Switch Information Recirculation The following diagram shows the recirculation system's basic operation of an NPE-A2/S2 series water heater system with the Navien NaviCirc and Navien HotButton kit or Dedicated Return Line. The NPE-A2/S2 series water heaters Note ●...
  • Page 35 Flexible Hoses Sensor* DHW Supply Expansion Tank City Water Supply Return Water [NPE-180A2/210A2/240A2] Set the 2-way valve inside the water heater to the "Ext" position when using the NaviCirc Note recirculation valve. NPE-S2 Water Heater HotButton Kit Wired Push Button*...
  • Page 36 HotButton Kit Ball Valve Expansion Tank Check City Valve Water Supply Temperature Sensor* DHW Supply Return Water [NPE-180A2/210A2/240A2] *The push buttons and the temperature sensor are not included with the water heater but are available for purchase. Installing the Water Heater...
  • Page 37 3.4.6 Connecting a Pressure Relief Valve When installing the valve, follow these guidelines: Ensure that the discharge capacity of the pressure ● relief valve is equal to or greater than the WARNING maximum pressure rating of the water heater. Ensure that the maximum BTU/H rating on the ●...
  • Page 38 From the water heater directly into an external drain. Drain b. From the water heater, through a neutralizing The Navien Condensing Water Heater creates agent, and then into an external drain. condensation when it operates. This condensation If you choose this option, the has an acidic pH of 3 - 5.
  • Page 39 To connect the condensate drain: 3. Fill the condensate trap inside the water heater by pouring water through the exhaust vent 1. Connect a drain line to the in fitting at the on top of the water heater until water flows bottom of the water heater.
  • Page 40 If option 'b' is selected for condensate disposal, 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 the public sewer system.
  • Page 41 6.0. For replacement media, air, you MUST Remove contaminants contact your local Navien distributor. permanently or Relocate air inlet and vent terminations to other clean areas. The warranty does not cover damage caused ●...
  • Page 42 3.6.1 Venting the Water Heater Corrosive Contaminants Muriatic acid/hydrochloric acid DANGER Refrigerant leaks Chlorine-type bleaches, detergents, and cleaning This appliance is certified as a “Category IV” solvents found in household laundry rooms appliance and requires a special venting system. The vent system will operate with a Varnish removers or paint positive pressure in the pipe.
  • Page 43 The water heater must be properly vented to ensure 1. Measure 3.0” inches from the end of the vent a constant supply of clean intake air and to ensure pipe, then draw a mark at that distance. that exhaust air is properly removed from living areas.
  • Page 44 CAUTION DANGER Do not start the vent run with a street elbow at If the connections leak, harmful flue gas may the vent collar. Using an elbow directly at the cause personal injury or death. after completing collar will not allow for a tight seal between the the installation and filling the water heater with appliances and vent pipe.
  • Page 45 Purpose WARNING The VID’s purpose is to guide the installer to fully insert the vent pipe to a depth of at least 3.0 inches The failure to properly install the vent ● or 76 mm, into the collar. If the vent pipe is not pipe into the water heater collar or using properly inserted and installed, it could separate incorrectly sized vent pipe materials in strict...
  • Page 46 3.6.3 Selecting a Vent Type WARNING Navien NPE Series water heaters are Category IV appliances and are prepared at the factory to be direct vent (sealed combustion) appliances that The vent draw all of their required combustion air directly installation from the outdoors.
  • Page 47 Inside corner detail REGULATOR VENT OUTLET In the event no regulator Legend: is present, H and I can be disregarded. = Vent Terminal = Air Supply Inlet = Area where terminal is not permitted Ref Description Canadian installations US installations Clearance above grade, veranda, 12 in (30 cm) 12 in (30 cm)
  • Page 48 Navien warranty. If there is any question about the possibility of back drafting in the installation location, use a direct venting system for the water heater.
  • Page 49 3. Combustion air requirements are based on the latest edition of the National Fuel Gas Code, WARNING NFPA 54 / ANSI Z223.1; in Canada refer to the latest edition of CGA Standard CAN/CSA B149.1. Do not install this water heater in a recreational All local codes supersede these clearance vehicle, trailer, boat or other vehicular type unit requirements when applicable.
  • Page 50 Inside corner detail REGULATOR VENT OUTLET In the event no regulator Legend: is present, H and I can be disregarded. = Vent Terminal = Air Supply Inlet = Area where terminal is not permitted Ref Description Canadian installations US installations Clearance above grade, veranda, 12 in (30 cm) 12 in (30 cm)
  • Page 51 Ref Description Canadian installations US installations 6 in (15 cm) for appliances ≤ ● 10,000 Btuh (3 kW), Clearance to nonmechanical air 12 in (30 cm) for appliances 4 ft (1.2 m) below or to side of ● supply inlet to building or the >...
  • Page 52 3.6.4 Selecting Vent Pipe Materials To change the Exhaust Limit Control Enable parameter setting, press and hold the Menu button Venting requirements differ in the US and Canada. ) and the Back button ( ) simultaneously for 3 Consult the following chart or the most recent seconds to access the Service/Installer menu.
  • Page 53 This water heater has a built-in control to and ULCS636) ● limit the exhaust temperature to 149°F. As FSA-PVC3 (3” PVC to FasNSeal Appliance Adapter) a result, the Navien water heater can be FSxxxxx03 (3”) vented with Schedule 40 PVC. Duravent FasNSeal® (Flexible) (Certified to ●...
  • Page 54 3.6.5 Measuring Vent Length Diversitech (Certified to ULCS636) ● 2 in Kit #CVENT-2 The maximum vent length when using 2 in exhaust 3 in Kit #CVENT-3 ducts is 75 ft (23 m). The maximum vent length IPEX Low Profile Termination Kit (Certified to ●...
  • Page 55 Indoor Water Heater Installation Hart & Cooley Polyflue™ (Certified to ULCS636) ● 2PF-90 or 3PF-90 (2” or 3” 90° Elbow) Venting Examples 2PF-45 or 3PF-45 (2” or 3” 45° Elbow) 2PF-T or 3PF-T (2” or 3” Tee) The following are some possible indoor venting options: 2PF-HVST or 3PF-HVST (2”...
  • Page 56 Two-pipe Vertical Venting - Intake and exhaust Concentric Sidewall Venting ● ● pipes do not have to terminate in the same area. Combustion Air Intake 36” (900 mm) min. Combustion Exhaust Gas Air Intake Exhaust Exhaust 1 in (25 mm) min. Intake Air 12”...
  • Page 57 Low Profile Two-Pipe Sidewall Venting* Two-Pipe Snorkel Sidewall Venting ● ● Intake Air Exhaust Gas (from outdoors) Exhaust (from appliance) Intake Air [Exterior View] * IPEX and Centrotherm Low Profile terminations only * Clearance above highest anticipated snow level or grade, or as required by local codes, whichever is ** Clearance above highest anticipated snow level greater.
  • Page 58 All installations using the fl exible vent materials ● The Navien Outdoor Vent Kit must be used to ● must be in INDIRECT vent applications only. ensure proper operation of the water heater.
  • Page 59 3.7 Connecting the Power Supply We recommend using a surge protector to ● protect the water heater from power surges. If there is a power failure in cold weather areas, ● the freeze prevention system in the water heater WARNING will not operate and may result in freezing of the heat exchanger.
  • Page 60 3.8.2 Setting the Front Panel DIP Setting Up the Altitude Switches 1. Press and hold the Menu button ( ) and the The two DIP switches on the front panel Back button ( ) simultaneously for 3 seconds configure the water heater's gas type settings and on the front panel to access the Service/Installer Temperature Lock.
  • Page 61 You can connect up to 32 water heaters to meet high-volume hot water demands. Some possible connection options include the following: Recirculation via Internal Pumps (“A2” model only): ● Union Communication Ball Valve or Navien Cable Plumb Easy Valve Check Valve Faucet Expansion Tank...
  • Page 62 Multiple NPE-S2 Units: ● Union Communication Ball Valve or Navien Cable Plumb Easy Valve Check Valve Faucet Expansion Tank Pressure Relief Valve Gas Supply Line DHW Supply Line Cold Water Supply Line [NPE-150S2/180S2/ 210S2/ 240S2] 4.1.1 Piping Sizes and Considerations...
  • Page 63 Up to 32 water heaters can be connected with button ( ) to start the cascade system setting. Navien Ready-Link communication cables. Select one of the water heaters in the cascade system as the main water heater, and then connect the other water heaters to it as sub.
  • Page 64 5. After an ID is assigned to each sub unit, press the OK button ( ) on the main unit. The temperature information on the main unit’s display will sync with the sub unit’s display. To add additional sub units later, Note ●...
  • Page 65 The Navien Common Vent System* provides an easy Improper venting of the water heater units ● way to install the vent system for up to 12 Navien can result in excessive levels of carbon NPE water heater units. By sharing the main intake...
  • Page 66 If the water heater units will be installed in areas ● the Navien Common Vent Collar Kit must be where snow is known to accumulate, protect installed in the exhaust duct of each water the vent termination from blockage. Ensure that heater unit.
  • Page 67 The water heater units can be mounted either IN- LINE or BACK TO BACK. Side Back Side Front Bottom [Navien Modular Configuration with Rack System] [Clearance Chart for Common Vent Applications] Bottom 12” (300 mm) Back 0.5” (13 mm) Side 3”...
  • Page 68 General and Local Standards Selecting Vent Pipe Materials Information Consult the following chart or the most recent edition of ANSI Z223.1/NFPA 54, as well as all applicable When installing and operating the common vent local codes and regulations when selecting vent system, the following standards and regulations pipe materials.
  • Page 69 To connect the vent pipes using cement: DANGER 1. Spread an even layer of solvent cement on the inside of the pipe fitting and the outside of the Be careful not to apply force or impact to pipes pipe. after making connections. An impact may break the bond and harmful gas might leak inside the room.
  • Page 70 [Total Length (L) = W + H] (Direct & Non-Direct Vent) The following illustration depicts an example of a Vent Length for NPE Water Heater Units common vent system installed for a cascade system of 12 Navien NPE heater units. Required Model Total Length (ft) Load (Total NPE-240A2/S2 D=3”...
  • Page 71 5.2 Navien Common Vent Collar Specifications Kit (Back-draft Damper) The Navien Common Vent Collar Kit includes a backdraft damper preventing the flue gases and cold outside air from entering the water heater when the combustion fan is off. The kit includes the 5.9”...
  • Page 72 Gasket Maintenance port cover Fix screw Refer to “5.8 Maintenance” for detailed inspection procedures of the Navien Common Vent Collar Kit (Back-draft Damper). When using a common vent in a Note cascade system, backflow devices are required to prevent exhaust from 2.
  • Page 73 5.3.2 Connecting the Pipe to the 4. Tighten the four mounting screws to secure the Common Vent Collar Kit in place. The screws (x Common Vent Collar Kit 4) are supplied with the Common Vent Collar Kit. WARNING When cutting the vent pipe, ensure that the cutting plane of the pipe is at a 90° angle with the pipe axis and is as flat as possible.
  • Page 74 5.3.3 Assembling the Wye Joint 2. Insert the vent pipe into the vent collar to start the vent run. Make sure to completely slide the vent into the collar until the end makes contact 1. Assemble the hub wye, the 2” reducer, and the with the bottom of the socket.
  • Page 75 2. Assemble the wye joint or wye assembly to the vent pipe. Apply solvent cement to the mating DANGER surfaces. If the connections leak, harmful flue gas may cause personal injury or death. After completing the installation and filling the water heater with water, turn on the boiler and test for leaks using a bubble test kit.
  • Page 76 5.4 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 water heater units and the common vent system. Ensure that the common vent system is installed near the water heater units while satisfying all clearance requirements that are specified in this manual as well as the Installation Manuals supplied with the water heater units.
  • Page 77 5.5 Installing a Condensate Drain To install a condensate drain to the Common Vent system: Refer to the following examples to install a 1. Form a loop with a drain hose and fix it with a condensate drain hose (field supplied) to the tie.
  • Page 78 5.6 Setting up the Common Vent Setting up the Altitude System 1. Press and hold the Menu button ( ) and the Back button ( ) simultaneously for 3 seconds on the front panel to access the Service/Installer DANGER menu. Incorrect Service/Installer menu...
  • Page 79 5.7 Common Vent Termination 5.7.3 Direct Vent Application – Horizontal Installation Clearances 5.7.1 Direct Vent Application – Vertical Installation 36" (91cm) min. Exhaust Exhaust 12" Intake (30 cm) min. 12" (30 cm) min. Maximum length 20’ (6 m) Minimum length 36” Intake Unit 1 Unit 2 Unit 12...
  • Page 80 5.8 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 81 6. Operating the Water Heater WARNING Follow the instructions below to avoid unsafe operating conditions that could cause property damage, severe personal injury, or death. Ensure that the water heater is filled with ● water before turning on the water heater. If overheating occurs or the gas supply fails to ●...
  • Page 82 6. Select the recirculation mode. 2. Press the Up button ( ) or the Down button ) until the desired temperature appears on A2-Type: ● the display. You can adjust the temperature – Int.Recir (Always On/Intelligent/Weekly) while the display is flashing. Once the display –...
  • Page 83 6.3.1 Using Commercial Mode 6.3.2 Resetting the Water Heater To use water above 140 °F (60 °C) (up to 185 °F (85 If an error message appears, you can try resetting °C)), you can use Commercial Mode. the water heater to resolve the problem. To reset the water heater, press the Back button ( To enter Commercial Mode: The Temperature ●...
  • Page 84 6.4.1 Setting the Recirculation Mode 2. Press the Up button ( ) or the Down button ) to switch between the information items 1. Press the Menu button ( ) on the front panel, and press the OK button ( ) to select an item.
  • Page 85 A2-type models. Set to use the included HotButton controller. Refer 4. HotButton “3.4.4 Navien HotButton Kit” on page 30. * To choose this option, you must set up the Time settings in the Configuration menu. S2-type models are automatically set Note ●...
  • Page 86 Setting the Weekly Schedule 2. Press the Up button ( ) or the Down button ) to switch between the information items. When setting up the Weekly option, select Weekly, Press the OK button ( ) to select an item and and select 1 Day, 3 Day, or 7 Day to go to the view its information.
  • Page 87 Item Description AHU communication state 18. AHU Comm (when the AHU Comm is enabled) 19. Recirc Setting Recirculation setting Info information External pump use 20. Recirc Ext. information for Pump Info recirculation A list of 10 recent errors are displayed on the screen, 21.
  • Page 88 6.4.4 Viewing Other System Information 6.4.5 Setting the Display Options 1. Press the Menu button ( ), and then select 1. Press the Menu button ( ) and then select 4. EMS Data. 5. Configuration. 2. Press the Up button ( ) or the Down button 2.
  • Page 89 6.5 Accessing Advanced Menu 3. Press the Up button ( ) or the Down button ) to switch between information items. Press Items the OK Button ( ) to select an item to view the information. 6.5.1 Viewing the Installer Menu Item Description 1.
  • Page 90 6.5.1.1 Viewing Service Status Info 6.5.1.2 Setting the Operation Parameters 1. From the Installer Menu, select 1.Service Status 1. From the Installer Menu, select 2. Parameter Info. Settings. 2. Press the Up button ( ) or the Down button 2. After entering the parameter setting screen, ) to switch between information items.
  • Page 91 Item Description Item Description Enable or disable the Enable or disable the use of exhaust limit control high temperature water. function. 6. Exhaust Limit Setting range: ● 12. Commercial - Enable: 140 °F (60 °C) - Control Enable Setting range: Enable, ●...
  • Page 92 6.5.1.3 Setting the Application Category Item Description 1. From the Installer Menu, select 3. Application Set the pump run Settings. delay time when AHU and AHU pump control are 1. AHU Burn Delay Time Setting range: ● 0 - 120 Sec Default: 30 Sec ●...
  • Page 93 Category Item Description Category Item Description Set the outdoor Set the pipe length high temperature to the desired when AHU and position for virtual the outdoor reset turn-off function function are ON. using the internal thermostat when 4. AHU Outdoor Setting range: ●...
  • Page 94 Category Item Description Category Item Description Set whether to Set the use an external temperature DHW tank. to turn on an 1. External DHW external DHW Setting range: ● Tank Setting tank combustion. Enable, Disable Setting range: ● Default: ● 4.
  • Page 95 Outdoor Reset Control 2-Stage T/S Output Heat-Capacity The Outdoor Reset Control feature can be used Models with the 2-stage air handler control function to enhance energy efficiency while maintaining (W1, W2) can use a 2-stage thermostat or can be optimal heating performance. Outdoor Reset automatically controlled by the H Air controller (If Control automatically changes the space heating...
  • Page 96 Item Description Item Description Number of an individual Execute this menu on the 1. Cascade Info water heater and the status main unit of a cascade system to end cascade operation. All Number of currently units will return to a single 2.
  • Page 97 Item Description Item Description Set the heating capacity This procedure slowly compensation standard increase RPM of the fan when the cascade motor from 0 to the 10. Cascade Unit OFF HC 1. Fan Motor combustion is OFF. maximum and then Offset decreases it to 0, and then Setting range: –5% - +5%...
  • Page 98 6.5.4 Setting the Special Operation 2. Press the Up button ( ) or the Down button Mode ) to switch between the special operation modes. Press the OK button ( ) to select a parameter or to run a special operation mode. 1.
  • Page 99 0 to 10,100 ft. DANGER Do not perform a gas & High Altitude conversion without an officially approved conversion kit and the instructions supplied by Navien. Gas & High Altitude conversion using any other parts will result in extremely dangerous burner WARNING operation, leading to fire, explosion, severe personal injury or death.
  • Page 100 In Canada: The conversion shall be carried out in accordance with the requirements of the provincial WARNING authorities having jurisdiction and in accordance with the requirements of the CAN‐B149.1 and CAN1‐ Be careful not to confuse the PROPANE ● B149.2 Installation Code. CONVERSION KIT and HIGH ALTITUDE CONVERSION KIT.
  • Page 101 Fan Motor Assembly. Carefully remove the four injury, death or substantial property damage. screws by hand using a Phillips screwdriver and Navien water heaters are shipped ready to pull the Gas Valve away from the Fan Assembly fire natural gas ONLY.
  • Page 102 GAS : NG GAS : NG (H) GAS : LP 20049500A 20051240A 20050545A 4.50 / 6.30 4.65 / 6.50 3.65 / 4.95 <NPE-180A2/S2 Orifice Identification> <NPE-150S2> GAS : NG GAS : NG (H) GAS : LP 20049501A 20051241A 20050546A 4.80 / 7.50 5.05 / 7.75...
  • Page 103 10. Set the panel setting corresponding to the installation altitude. DANGER a. Press and hold the Menu button ( ) and the Back button ( ) simultaneously for Inspect the O-ring between the gas valve and 3 seconds on the front panel to access the gas valve inlet adapter whenever they are Service/Installer menu.
  • Page 104 High Water CAUTION Fire Fire Altitude Fuel Heater Ensure that the High Altitude setting reflects the actual location of the water heater. If not, it 0 - 5,399 ft Natural NPE- may cause personal injury or malfunction of the 180A2 5,400 - 10,100 ft water heater.
  • Page 105 d. Fully open several hot water fixtures and set Model Altitude Kit Part No. Offset the water heater to operate at 2-stage MAX Type mode (refer to “Setting the Operation Mode” on page 105). Measure the CO value at 0 - 5,399 ft NAC-N210 Natural -0.03 in high fire.
  • Page 106 Setting the Operation Mode 13. Once the CO or offset values have been confirmed, apply the included conversion stickers 1. Press and hold the Menu button ( ) and the to show that the appliance has been converted Back button ( ) simultaneously for 3 seconds to natural gas.
  • Page 107 7.2 Technical Data Pressure Drop Curve Water Flow (GPM) [NPE-240A2/ 240S2] Water Flow (GPM) [NPE-210A2/ 210S2] Water Flow (GPM) [NPE-180A2/ 180S2] Water Flow (GPM) [NPE-150S2] 106 Appendixes...
  • Page 108 ΔT - Temperature Rise(℉) [NPE-210A2] 10.0 ΔT - Temperature Rise(℉) [NPE-180A2] At altitudes above 2,000 ft (610 m), the outlet flow will be reduced by 3% (NG Model) or 4.5% (LP Note Model) for each 1,000 ft (305 m) of altitude gain.
  • Page 109 Outlet Flow Data ΔT - Temperature Rise(℉) [NPE-240S2] ΔT - Temperature Rise(℉) [NPE-210S2] ΔT - Temperature Rise(℉) [NPE-180S2] 10.0 ΔT - Temperature Rise(℉) [NPE-150S2] At altitudes above 2,000 ft (610 m), the outlet flow will be reduced by 3% (NG Model) or 4.5% (LP Note Model) for each 1,000 ft (305 m) of altitude gain.
  • Page 110 7.3 Wiring Diagram CON3 CON2 CON8 CON6 CON9 CON7 [NPE-150S2, 180A2/S2, 210A2/S2, 240A2/S2] Appendixes...
  • Page 111 7.4 Ladder Diagram LIVE NEUTRAL Option 120VAC Relay 1 External Pump FILTER Relay 2 Igniter Relay 3 Circulation Pump NPE-A2 Serise Only Relay 4 Venturi DC15V Transformer BLDC-FAN Primary Speed Control Sencondary Water Ad justment AC130 Mixing Valve Valve (NPE-S2 Serise Only Trans DC24V DC 9V...
  • Page 112 7.5 Component Assembly Diagrams and Parts Lists 7.5.1 Case Assembly Appendixes...
  • Page 113 Description Service Code Part # Remark 20049732* NPE-180A2/210A2/240A2 Case 20049515* NPE-150S2/180S2/210S2/240S2 Cover 30026143A 30024855* Air Pressure Sensor 30021100A 30021100* Intake Air Filter 30016248B 30016248* Panel Bracket 20049470* Front Panel 30024955A 30024955* Power Switch 30009482A 30009482* 30024835A 30024835* NPE-180A2/210A2/240A2 30024837A 30024837*...
  • Page 114 7.5.2 Burner Assembly (NPE-180A2/ 210A2/ 240A2) 27 28 Appendixes...
  • Page 115 Description Service Code Part # Remark 30026111A 30024850* NPE-210A2/240A2 Heat Exchanger Assembly 30026110A 30025104* NPE-180A2 SC-Ex Inlet Adaptor 20049491* SC-Ex Outlet Adaptor 30024763* Thermistor 30008366A 30008366* Screw, S10A, 4×6 20017962A 20017962* Fastener 20007853A 20007853* Flow Sensor Assembly 30024866A 30024866* Latent-Ex Outlet Adaptor...
  • Page 116 7.5.3 Burner Assembly (NPE-150S2/180S2/ 210S2/ 240S2) 29 30 8 29 Description Service Code Part # Remark 30026111A 30025252* NPE-210S2/240S2 Heat Exchanger Assembly 30026110A 30025110* NPE-180S2 30026109A 30025477* NPE-150S2 SC-Ex Inlet Adaptor 20049491* SC-Ex Outlet Adaptor 30024763* Thermistor 30008366A 30008366* Screw, S10A, 4×6 20017962A 20017962* Fastener...
  • Page 117 Description Service Code Part # Remark 30024769* H-Ex Middle Pipe 30024768* 30025435* Ignition Transformer 30010455A 30010455* Fan Bracket (R) 20022096* Fan Damper 30008825A 30008825* Fan Packing 20022744* Fan Bracket (F) 20022095A 20022095* Screw, S18A, M4×6 20038859* Burner Fuse Bracket 20050642* Burner Fuse 30025036A 30025036*...
  • Page 118 7.5.4 Waterway Assembly (NPE-180A2/210A2/240A2) 19 8 21 22 Description Service Code Part # Remark Buffer Tank 30016125A 30023708* Fastener 20017724A 20017724* O-RING (P29) 20017923A 20017923* Buffer Tank Adapter 20035697A 20035697* Fastener 20017726* Buffer Tank Pipe A 20017759* Buffer Tank Pipe B...
  • Page 119 Description Service Code Part # Remark Hot Water Outlet Adapter 30008338* Thermistor 30008366A 30008366* Clip 20007733B 20007733* O-RING (P20) 20017212A 20017212* Pipe Adapter 20024496A 20024496* O-RING (P16) 20017210A 20017210* Check Valve Adapter 20048412A 20048412* Check Valve 30008360* O-RING (P19) 20017211A 20017211* Water Filter 30008171A...
  • Page 120 7.5.5 Waterway Assembly (NPE-150S2/180S2/210S2/240S2) Appendixes...
  • Page 121 Description Service Code Part # Remark Syphon 30024921A 30024921* Cold Water Inlet Adapter 30024923A 30024923* Hot Water Outlet Adapter 30024924* Water Adjust Valve 30022123A 30022123* (Built in Flow Sensor) Mixing Valve 30022124A 30022124* Screw, STS430, M4×10 20038758* Clip 20045992A 20045992* O-RING (P18) 20006947A 20006947*...
  • Page 122 7.5.6 Fan (Gas) Assembly [NPE-210S2/210A2/240S2/240A2] [NPE-180S2/180A2] [NPE-180S2/180A2/210S2/210A2/240S2/240A2] Appendixes...
  • Page 123 [NPE-150S2] 122 Appendixes...
  • Page 124 Description Service Code Part # Remark 30024773A 30024773* NPE-210S2/240S2/210A2/240A2 Gas Pipe 30024772A 30024772* NPE-180S2/180A2 30025069A 30025069* NPE-150S2 Gas Connector 20018430A 20018430* Gas Valve 30011586B 30011586* Gas Inlet Adapter 20023809A 20023809* Gas Inlet Adapter Packing 20023581* Screw, S10A, M4×12 20006390A 20006390* O-Ring (P20) 20006934A 20006934*...
  • Page 125 “Troubleshooting” in the Owner’s 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 Water Heater...
  • Page 126 Connecting a Pressure Relief Valve Have you installed an approved pressure relief valve on the water heater? Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the water heater? Is the pressure relief valve at least in in diameter? Have you installed the pressure relief valve on the hot water outlet pipe near the water heater?
  • Page 127 CAUTION This device is designed to work with the NPE-A2/S2 models ONLY. Basic Principles The following diagram shows the basic operation of NPE-A2/S2 water heater system with the Navien H2Air add- on controller. CAUTION Do not configure the system for DHW recirculation when it is configured to run an air handler using the H2Air add-on controller.
  • Page 128 System Diagram for NPE-A2 NPE-A2 Series Water Heater Outdoor Sensor External Pump (Optional)* Thermostat Heat Demand Output Expansion Tank Space Heating Check Supply Valve Cold Water Supply Space Heating Flow Switch External Pump Return (Optional)* *Connect the external pump cable to the NPE-A2 PCB.
  • Page 129 7.8 AHU Application with RS-485 Communication (optional) CAUTION This application is designed to work with the single unit ONLY. NPE-A2 Series Water Heater Thermostat Recirculation Cold Water Supply Supply Water COMM Cable Mixing Air Eliminator Valve Circulator Check Valve Air Purge Valve Expansion Tank A/C or H/P Condensing Unit...
  • Page 130 7.9 Requirements for the State of 4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled 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 131 Memo...

This manual is also suitable for:

Npe-210a2Npe-240a2Npe-150s2Npe-180s2Npe-210s2Npe-240s2

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