Navien NPE-180A Service Manual
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Navien NPE-180A Service Manual

Npe series condensing water heaters
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See also: Operating Manual , User Manual
Service 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.navien.com.
●
- For Navien Service Specialists(NSS) ONLY, please have your 6-digit NSS ID Number ready
and use the available NSS hotlline at 1-877-670-5122.
* Refer to the website: http://us.navien.com/BecomeNSS.
Contact the technician or professional who installed your water heater.
●
Contact a licensed professional for the affected system (for example, a plumber or electrician).
●
When you contact Technical Support, please have the following information at hand:
Model number
●
Serial number
●
Date purchased
●
Installation location and type
●
Error code, if any appears on the front panel display.
●
Navien, Inc.
800.519.8794
www.Navien.com
20 Goodyear lrvine, CA 92618
T H E
L E A D E R
I N
C O N D E N S I N G
Version : 2.30 (Nov. 08. 2016)
T E C H N O L O G Y

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Summary of Contents for Navien NPE-180A

  • Page 1 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.navien.com. ● - For Navien Service Specialists(NSS) ONLY, please have your 6-digit NSS ID Number ready and use the available NSS hotlline at 1-877-670-5122. * Refer to the website: http://us.navien.com/BecomeNSS.
  • Page 2 Service Manual NPE Condensing Water Heaters Model NPE-180A NPE-210A NPE-240A NPE-150S NPE-180S NPE-210S NPE-240S Keep this manual near this water heater for future reference whenever maintenance or service is required. NSF/ANSI 372 * The wetted surface of this product contacted by consumable water contains less than one quarter of one percent (0.25%) of lead by weight.
  • Page 4 Revisions Version Description of changes Date 1.00 First Issue September/31/12 1.01 Specification change (PCB) April/19/13 2.00 Additional models (NPE-180S, 210S, 240S) July/22/13 2.10 Additional funtion (Front Panel) September/12/13 2.20 Additional sub error code list and Supplement of ComfortAir+ Manual April/14/14 2.21 NPE-S Energy factor change November/24/14...

  • Page 5: Table Of Contents

    10.2 Installing the Device 5.1.5 030Error 10.3 Wiring the Device 5.1.6 046Error 5.1.7 047Error 10.4 Configuring the Device 5.1.8 060Error 10.5 Configuring the NPE-180A/240A Water Heater 5.1.9 109Error 10.6 Maintenance 5.1.10 110Error 10.7 Appendix 5.1.11 407Error NPE Service Manual Version 2.21...

  • Page 6: Navien Warranty

    Navien original factory component. Navien, at its sole Navien. When the product is installed in a new construction, the discretion, may replace the product with a new or refurbished commencement date shall be dated upon which the end-user product of comparable quality and design.
  • Page 7 OR FITNESS FOR A PARTICULAR PURPOSE. Navien’s total liability for any claim arising hereunder shall not exceed the purchase price which you paid for the Product. NAVIEN SHALL NOT IN ANY EVENT BE LIABLE FOR INDIRECT, SPECIAL, CONSEQUENTIAL OR LIQUIDATED DAMAGES OR PENALTIES, INCLUDING CLAIMS FOR...
  • Page 8 Abbreviations and Definitions Abbreviation Definition General name of NPE-180A, NPE-210A, NPE-240A, NPE-150S, NPE-180S, NPE-210S, and NPE-240S Natural Gas Propane Gas Air Pressure Air Pressure Sensor Domestic Hot Water Fan Motor GARC Gas Air Ratio Control Gallons Per Minute Gas Valve : Main and Solenoid...

  • Page 9: Safety Information

    1. Safety Information 1.1 Safety Definitions 1.3 Symbols Used in the Instructions All Safety messages indicate the risk of potential hazards. Follow the The following symbols are used throughout the instructions to instructions precisely to avoid the risk of injury. bring attention to important information concerning the appliance.
  • Page 10 DANGER DANGER HOT WATER TEMPERATURE SETTING Water temperatures at or above 125°F (52°C) can cause ● severe burns instantly or death from scalds. Households with small children, disabled, or elderly persons ● may require 120  °F (49°C) or lower temperature setting to prevent contact with “HOT”...
  • Page 11 DO NOT attempt to change the water temperature while ● This Navien Water Heater is factory set at 120°F (49°C) for ● someone is using the water heater. your safety and comfort. Increasing the set temperature DO NOT use parts other than those specified for this increases the risk of accidental scalding.
  • Page 12 Turn off and discontinue use of the water heater if any of the vent pipes, vent elbows, or intake pipes are Navien, Inc. is not liable for any property damage and/or damaged in any way, separated at a joint, or show evidence personal injury resulting from unauthorized conversions.

  • Page 13: Product Information

    2. Product Information 2.1 Product Information CAUTION Navien features the new NPE “A” Series tankless gas water heater with a built-in Circulation Pump and Mini Buffer Tank (the NPE ”S” Do not attempt to repair or replace any part of the water ●...

  • Page 14: Layout And Key Components

    Water Adjustment Valve 2-Way Valve Gas Inlet Fitting Water Inlet Filter Power Switch DHW Supply Fitting Condensate Drain Fitting Recirculation Inlet Fitting Condensate Drain Lid [NPE-180A/ 210A/ 240A] * Refer to components Diagram and Part List in page 133. Product Information...
  • Page 15 Exhaust Duct Exhaust Limit Temperature Sensor Intake Air Duct Exhaust Body Fan Motor Ignition Transformer Burner Dual Venturi Primary Heat Exchanger High Limit Switch Gas Pipe Secondary Heat Exchanger APS (Air Pressure Sensor) Freeze Protection Switch Front Panel Condensate Trap Gas Valve PCB Box Flow Sensor...
  • Page 16 Exhaust Duct Exhaust Limit Temperature Sensor Intake Air Duct Exhaust Body Fan Motor Ignition Transformer Burner Single Venturi Primary Heat Exchanger Gas Pipe Secondary Heat Exchanger Freeze Protection Switch Front Panel APS (Air Pressure Sensor) Condensate Trap PCB Box Gas Valve Flow Sensor Water Adjustment Valve Mixing Valve...

  • Page 17: Technical Data

    3. Technical Data 3.1 General 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-150S NPE-180(A) NPE-180S NPE-210(A) NPE-210S NPE-240(A) NPE-240S Heat 18,000- Natural Gas 15,000-150,000 BTU/H...

  • Page 18: Dimensions

    3.2 Dimensions The following diagrams show the dimensions of the water heater and the table lists the supply connections. Supply Connections Description Diameter Air Intake 2" Exhaust Gas Vent 2" Hot Water Outlet 3/4" Recirculation Inlet 3/4" (“A” models only) Cold Water Inlet 3/4"...

  • Page 19: System Details

    Tank Flow Sensor Circulation Check 2-Way Valve Pump Valve Water Closed 2-way valve closed for External Recirculation Mode Adjustment Valve Domestic Hot Water Recirculation Water Supply Supply Water Supply External Recirculation Mode [NPE-180A/ 210A /240A] NPE Service Manual Version 2.21...
  • Page 20 Primary Heat Exchanger Secondary Heat Exchanger Mixing Valve Flow Flow Adjustment Sensor Valve Cold Water Water Supply Supply [NPE-150S/ 180S / 210S / 240S] System Details...

  • Page 21: Operation Flow Chart

    4.2 Operation Flow Chart 120v Power IG : Igniter Applied MGV1 : Main Gas valve 1 MGV2 : Main Gas valve 2 System Displays version Initialization Standby Mode Flow sensor ≥ 0.53 gpm Fan start-up & Fan control IG ON MGV1 ON MGV2 ON Stage 2...

  • Page 22: Setting The Dip Switches

    4.3 Setting the DIP Switches 1. Water Flow Begins Water Flow Sensor sends pulses to the PCB when it registers ● water flow. The water heater has two DIP switch locations: on the main circuit board (PCB) and on the front panel. Each location has two sets PCB senses flow greater than 0.53 GPM (approximate).
  • Page 23 10-switch Panel: ● Setting Switch Function Remark “A” models “S” models DIP switch setting (NPE-180A/ 210A / 240A) (NPE-150S/180S/210S/240S) 1-OFF; 2-OFF; 3-OFF * Intelligent Preheating: No Recirculation Learns the user's hot water usage patterns and starts Recirculation Internal Recirculation No Recirculation 1-ON;...
  • Page 24 NOTE To use the water heater at a specific altitude, the DIP switches should be set as described above. ● When configuring a cascade system, all settings other than the high altitude, gas type and preheating settings are controlled by the DIP ●...

  • Page 25: Measuring The Inlet Gas Pressure

    4.4 Measuring the Inlet Gas Pressure 4. Remove the water heater front cover by loosening the 4 Phillips head screws securing it to the case. WARNING The water heater cannot function properly without sufficient inlet gas pressure. Measuring the inlet gas pressure should be performed by a licensed professional only.
  • Page 26 4.4.1 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” WC Pressure Drop). Contact your gas supplier for BTU/ft ratings.
  • Page 27 Maximum Liquefied Propane Delivery Capacity in Thousands of BTU/H (0.5” WC Pressure Drop) Length (including fittings) Pipe Size 100' 125' 150' 175' 200' 250' (3m) (6m) (9m) (12m) (15m) (18m) (24m) (30m) (38m) (45m) (53m) (60m) (76m) 1/2" 3/4" 1" 1,150 1 1/4"...

  • Page 28: Selecting A Recirculation Mode

    3. Set the front panel DIP switches at the far left (set of ten) to: 1—ON; 2—OFF. On all “A“ model Navien water heaters, you can choose from two pre-heating modes: internal recirculation mode or external recirculation mode. To select a recirculation mode, you must set the DIP switches on the front panel, and set the position of the 2-way valve inside the water heater.
  • Page 29 External Recirculation Mode The following diagram shows the external recirculation flow for pre-heating: To use the external recirculation mode: 1. Connect the water supply to support recirculation. Refer to the Primary Heat Exchanger “Installation Manual (page 20)”. 2. Set the 2-way valve inside the water heater to “EXT. “ Buffer Secondary Heat Exchanger Tank...

  • Page 30: Gas Conversion

    This conversion kit shall be installed by a qualified service 2. Using a Phillips hand screwdriver, remove 4 screws (2 from the agency* in accordance with Navien’s instructions and all top and 2 from the bottom) of the front cover assembly to gain applicable codes and requirements of the authority having access to the internal components.
  • Page 31 Gas Inlet Pipe and Fan Motor Assembly could result in damage to the valve, causing potential severe personal injury, death or substantial property damage. Navien water heaters are shipped ready to fire natural gas ONLY. NPE Service Manual Version 2.21...
  • Page 32 O-ring NPE-150S NPE-180A/ 210A/ 240A/ 180S/ 210S/ 240S Figure 6. Orifice identification 7. Replace the old Orifice piece with the new part for use with LP gas. Ensure that the Orifice is properly seated inside the port before proceeding to the next step.
  • Page 33 High fire Low fire Water Fuel Heater NPE-150S 10.2 10.8 NPE-180A NPE-180S 10.2 10.8 NPE-210A NPE-210S 10.2 10.8 DANGER NPE-240A When conversion is required, be sure to set the Front Panel ● NPE-240S 10.2 10.8 DIP switches according to the supply gas type.
  • Page 34 NAC-01 -0.03 in ± 0.01 in NPE-180A been converted to propane gas. Place this labels adjacent to NPE-180S the rating plate as shown in Figure 11.

  • Page 35: The Front Panel

    4.7 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. Error Master Unit A code will appear on the display Cascade operation Hot Water Recirculation Display...

  • Page 36: Turning The Water Heater On Or Off

    4.7.1 Turning the Water Heater On or Off 4.7.2 Adjusting the Water Temperature To turn the water heater on or off, press the Power button. WARNING Before adjusting the water temperature, read “HOT WATER TEMPERATURE SETTING” on page 40 carefully. Water temperatures above 120°F can cause instant scalding, severe burns, or death.

  • Page 37: Resetting The Water Heater

    You can adjust the temperature by the below 10-degree Press the + or – buttons to switch between the information types. increments, depending on the temperature range: Display Description Adjusting the water Temperature range temperature Flow rate in gallons per minute 98°F-120°F (Fahrenheit mode) (GPM).

  • Page 38: Lcd Display

    4.7.6 LCD display DISPLAY Function description Remark Displays when a recirculation mode is activated. When the remote controller is not connected: Preheating will operate based on the setting of the DIP switches on the front panel. When the remote controller is connected: Preheating will operate based on the Preheating setting timer settings of the remote controller (recirculation mode must be selected on the Preheating icon...
  • Page 39 4.7.7 Button Button Description or Diagnostic Reset Power Information Plus Minus name Short Key Function Remark [Diagnostic] short key Display of information for service [INFO] short key Display/confirmation of information for consumers [RESET] short key Error code release/reset [PLUS] short key Item movement/UP [MINUS] short key Item movement/DOWN...

  • Page 40: Normal Operation

    4.7.8 Power ON/OFF 6. When a level1 error occurs, the error icon flashes for 1 second and the error code and the setting temperature are toggled and displayed at intervals of 1 second (Level 1 Error = An error 1. Turn the power ON/OFF by pressing the [POWER] button for that can be reset without turning the power OFF then ON).
  • Page 41 4.7.10 Setting the Operation Mode 4. The error code is displayed in 3 digits. (see below) 1. Using the Front Panel, press and hold the Diagnostics Button for over 5 seconds until “1.TST” is displayed. 2. Press the + (Up) button once to change the display to “2.OPR”. 3.

  • Page 42: Viewing Basic Information

    US/Canada specification Increase/ decrease [+] continuous key [-] continuous key Temperature range [+] key [-] key value operation operation Increased every Decreased every 98~120°F (36~50°C) 1°F( 0.5°C) Short key Short Key 100msec 100msec 120~140°F Decreased every 5°F ( 2°C ) 2sec Long Key Not working Short Key...
  • Page 43 4.7.14 Error occurrence history display 1. At the <Normal operation mode> or <Error display mode>, press the [Info] button for over 2 seconds to access the error history mode. The most recent error will be displayed first. 2. When the [+] / [-] button is pressed, the error history can be searched. A total of 10 errors are stored in memory and are labeled from 0 to 9 with 0 being the most recent error.
  • Page 44 Item Description Display method OUT temperature display ex) 120°F (B)Hot Water Outlet Display of the current outgoing water temperature temperature IN temperature display ex) 120°F (C)Water Inlet Display of the current incoming water temperature temperature % Heat capacity display in percentage ex) 92% (D)Heat Capacity Display of current heat capacity %...
  • Page 45 Item Description Display method Display of the flame detection AD value 0~255 Flame detection current AD value display ex) 200 (J)Flame condition Flame On: 8bit AD value less than 70 Flame Off: 8bit AD value more than 175 Exhaust gas temperature display ex) 120°F (K)Exhaust gas Current exhaust gas temperature display...
  • Page 46 Item Description Display method CASCADE OFF (N)Number of currently Number of actually working units in the CASCADE ON: Display of the number of working units working cascade units current cascade system Ex) 8 units working CASCADE OFF CASCADE ON: MASTER UNIT, standby ON CASCADE ON: MASTER UNIT, standby OFF Cascade ON/OFF condition display Individual Master/Slave number and...
  • Page 47 Item Description Display method 0~2,000ft 2,000~5,400ft (Q) Altitude setting Displays the current altitude level setting information <panel version : after v1.5> 5,400~7,700ft 7,700~10,100ft OUT temperature display ex) 120°F Display of the current outlet temperature (R) Heat exchanger outlet (Applies to Front panel version V1.6 temperature (July 23, 2013) or later versions only) IN temperature display...
  • Page 48 4.7.16 Test information menu 8. Press the [Reset] button once to return to the <TEST INFORMATION MENU MODE>. (To the display of the previously entered item 1.TST) 1. At the <Normal operation mode>, press the [Diagnostic] button for over 5 seconds to access the <TEST INFORMATION 9.
  • Page 49 4.7.18 Operation Condition Setting Component Test Performed Display Whenever the [+], [-] button 1. While in <TEST INFORMATION MENU MODE>, press the [+]/ is pressed, the condition is [-] button and then press the [Info] button once when 2.OPR is After starting →...
  • Page 50 3. In the R&D information menu, use the Up (+) or Down (-) Mode Description Display method buttons to move to 2.PAR (Parameter information mode), and then press the Info button. 1. Mixing valve is operated only when an overshooting occurs. Mode Display method 2.
  • Page 51 4.7.22 Cascade system – Master unit Mode Description Display method replacement MASTER icon flashing Configuration with NPE units only Set as MASTER MASTER In order to replace the Master water heater and the controller or unit and assign setting change a slave unit into the MASTER unit, cancel the CASCADE ID numbers to mode SYSTEM and then repeat the CASCADE SYSTEM initialization...
  • Page 52 Configuration with a combination of NR, NP and CH units NOTE Follow these steps to replace an NR, NP, or CH unit in a cascade system with an NPE water heater: Ensure that you have properly configured the cascade protocol 1.

  • Page 53: Wiring Diagram

    4.8 Wiring Diagram [NPE-180A/ 210A/ 240A] NPE Service Manual Version 2.21...
  • Page 54 [NPE-150S/180S/ 210S/ 240S] System Details...

  • Page 55: Ladder Diagram

    MGV1 MCU 2 Thermistor 2 MGV2 Inlet Relay 1 Thermistor 1 Relay 2 Inlet Relay 4 Thermistor 2 Exhaust Thermistor Communication Interface UART FRONT Communication PANEL Interface Ready Link Ready Link Interface [NPE-180A/ 210A/ 240A] NPE Service Manual Version 2.21...
  • Page 56 NEUTRAL EXT_PUMP Relay 1 FILTER * NPE-180S/ 210S/ 240S only VENTURI Relay 2 Relay 3 IGNITER Relay 4 PUMP Primary Primary SMPS Speed Control DC15V Secondary DC24V DC12V 200V FSA Power DC5V Switch Water Mixing Water Adjust Valve Valve Flame Rod Flow Sensor H.T.L WD-PSS...

  • Page 57: Electrical Diagnostic Points

    4.10 Electrical Diagnostic Points NPE Service Manual Version 2.21...
  • Page 58 Point Function Wire Color Normal Value Check High Temperature Limit Switch BLACK-BLACK DC 0 V Normally Shorted. Confirm RMS voltage. RED-BLACK DC 5 V Confirm steady voltage. WHITE-BLACK DC 0.3~4.5 V Voltage changes according to the APS operation. RED-BLACK DC 12 V Confirm steady voltage.

  • Page 59: Key Components Description

    4.11 Key Components Description 4.11.1 PCB Part Check Point Function To control each component and also to check the overall performance of the unit. Failure Event Malfunctioning PCB. A component may not operate within the unit and could produce an error code. In most cases of PCB failure, the Effects whole unit will not operate until the problem is resolved.

  • Page 60: High Limit Switch

    4.11.2 High Limit Switch Check Point Check Point 1. Overheat prevention switch. 2. If the unit detects extremely high temperatures, it will automatically trip and shut down the unit. Function 3. Excessively high water temperatures (more than 197.6 °F or 92 °C) in heat exchanger will activate the high limit switch.

  • Page 61: Thermistor

    4.11.3 Thermistor Part Check Point Function Measure inlet, outlet, and internal heat exchanger temperatures in the water heater. Failure Event Unable to properly measure water temperature within the water heater. 1. If any of the thermistors fail, an error code appears before starting operation. Effects 2.

  • Page 62: Fan Motor

    4.11.4 Fan Motor Part Check Point To provide combustion air into the burner and to purge exhaust flue gas. Function To maintain the gas input with a long vent run, the fan operates with APS for ideal combustion. 1. Fan speed failure: the fan RPM is around 0 RPM. Failure Event 2.

  • Page 63: Flame Rod Assembly

    4.11.5 Flame Rod Assembly Part Check Point Function To ignite gas by repeatedly discharging a high voltage spark to the main burner until gas ignites. 1. Unable to ignite during the ignition process. Failure Event 2. Produces multiple unsuccessful attempts to ignite. 1.

  • Page 64: Ignition Transformer

    4.11.6 Ignition Transformer Part Check Point Function To ignite gas by repeatedly discharging a high voltage spark to the main burner until gas ignites. 1. Unable to ignite during the ignition process. Failure Event 2. Produces multiple unsuccessful attempts to ignite. 1.

  • Page 65: Aps

    4.11.7 APS Part Check Point Function Detecting the air pressure entering the burner system. 1. Combustion noise occurs. Failure Event 2. Imperfect and/or abnormal flame occurs. 3. Occurs when APS does not detect proper voltage. 1. The water heater is not operating. Effects 2.

  • Page 66: Main Gas Valve

    4.11.8 Main Gas Valve Part Check Point 1. To control the amount of gas supplied to the burner based on fan speed. Function 2. When the unit experiences abnormal combustion, it shuts off the gas valve automatically and prevents unsafe situations. Failure Event Unable to open/close 1.

  • Page 67: Burner

    4.11.9 Burner Part Check Point 1. Pre-Mix system reduces emissions and increase efficiency. Function 2. The burner facilitates the air/gas mixture necessary to produce the proper heat during combustion. 1. Unable to initialize/sustain combustion. Failure Event 2. Dust or soot deposit on the burner surface 3.

  • Page 68: Water Adjustment Valve

    4.11.10 Water Adjustment Valve Part Check Point Function To control the water flow to maintain steady hot water temperatures. Failure Event The valve cannot modulate or open/close in CASCADE mode. 1. Water Adjustment Valve is not operating properly. Effects 2. Abnormal flow detected during normal operation. “E434” displayed. 3.

  • Page 69: Flow Sensor

    4.11.11 Flow Sensor Part Check Point Function To detect water flow in GPM (Gallons Per Minute) for steady hot water temperatures. 1. Unable to detect or measure water flow rate. Failure Event 2. Damage to and/or water leakage from the water flow sensor. Effects Ignition sequence does not start.

  • Page 70: Primary Heat Exchanger

    4.11.12 Primary Heat Exchanger Part Check Point 1. Main part for heat transfer from the burner. Function 2. There are multiple paths of water pipes on the heat exchanger surface as well as inside the combustion chamber which minimizes the heat loss. 1.

  • Page 71: Secondary Heat Exchanger

    4.11.13 Secondary Heat Exchanger Part Check Point 1. Main part for heat transfer from the burner. Function 2. There are multiple paths of water pipes on the heat exchanger as well as inside the combustion chamber which minimizes heat loss. 1.

  • Page 72: Buffer Tank ("A" Models Only)

    4.11.14 Buffer Tank (“A” models only) Part Check Point To provide hot water at a steady temperature and to operate without a minimum flow rate with the use of the Function internal circulation pump. Failure Event Cracking and/or water leakage due to wear. Effects Temperature fluctuations in the hot water outlet and/or leaking.

  • Page 73: Circulation Pump ("A" Models Only)

    4.11.15 Circulation Pump (“A” models only) Part Check Point 1. Pump operates when using internal or external hot water circulation. Function 2. Internal circulation will minimize the effect of temperature fluctuations and external circulation delivers hot water to fixtures quickly resulting in water conservation. Failure Event Unable to detect or measure water flow rate when the pump is called to operate.

  • Page 74: Troubleshooting

    5. Troubleshooting 5.1 Error Code List Error Code Function Self-diagnostic/Action Code * Check to see if the main gas supply valve is open. * Verify that gas pressure is within operating range. * Check gas system and orifice. E003 Ignition failure * Check Dual Venturi for proper operation.
  • Page 75 Error Code Function Self-diagnostic/Action Code Abnormal Hot water outlet thermistor (Open) Check the thermistor. ● E407 Replace the thermistor. ● Abnormal Hot water outlet thermistor (Short) Abnormal Cold water inlet thermistor (Open) Check the thermistor. ● E421 Verify [C] value in DIAGNOSTIC mode. ●...
  • Page 76 ● If any of the above solutions do not resolve the problem with the Water Heater, contact Navien’s Technical department at 1-800-519-8794. There will be error codes displayed on the front panel and recorded on the PCB board (within the unit) of any problems or failures that occur with the Water Heater.

  • Page 77: 003Error

    5.1.1 003Error Error occurrence conditions and check items Error Description In the case of an ignition failure, the water heater will attempt ignition 10 times. If no flame is detected, the system Ignition failure displays the error message 03E (manually cleared) on the remote controller. 1.
  • Page 78 Scenario2 Does the main Is gas valve operating Check connector gas valve have proper normally? voltage? Check the voltage between #1 and #3 of CON 4: 22-24 VDC Check the voltage between #2 and #3 of CON 4: 22-24 VDC (see page 52 for Wiring Diagram) Check that gas valve is open or Is gas valve open?
  • Page 79 Check method Failure mode Cause Check method 1. Check if the main gas valve is open. 2. Check the gas supply pressure. NG: 3.5” - 10.5” W.C, LP: 8” - 13” W.C ● LP pressure drop occurs frequently in the winter. ●...
  • Page 80 Failure mode Cause Check method Electrode gap 3.5~4.5mm(1/8") Electrode gap error When no spark is made from the electrode at ignition: Remove the electrode and check if there is a crack on the insulator. ● Adjust the gap if there is a discharge of electricity from the metallic part of the ●...
  • Page 81 Failure mode Cause Check method 1. Check the primary/secondary power supply to the main gas valve. Check, with a multimeter, if the input power is DC 22-24 V. ● 2. Replace the PCB if power is not supplied. Main gas valve 3.

  • Page 82: 004Error

    Failure mode Cause Check method Check if there are any Ignition failure will occur if the gas orifices are clogged. Flame loss and noise blockages in the gas occurs at ignition Remove the gas inlet pipe and check the orifice plate. ●...
  • Page 83 Error Description 1. Check if gas leaks due to defective seals on the main gas valve. 2. Check if proper spark is discharged from the electrode. Check items 3. Check if gas is supplied within the proper pressure range. 4. Check the PCB and replace if defective. Is the flame detected in Clean or replace flame rod the burner when there is...

  • Page 84: 012Error

    5.1.3 012Error Error occurrence conditions and check items Error Description If the system detects loss of flame during combustion, the system stops supplying fuel, attempts to restart, E012 counts the incidents of flame loss, and if the incident occurs 20 times consecutively displays 012E (manually Flame loss cleared) on the front panel.
  • Page 85 Check method Possible Fault Check method Causes 1. Check the gas supply pressure. NG: 3.5” - 10.5” W.C, LP: 8” - 13” W.C ● LP pressure drop occurs frequently in the winter. ● 2. While the static pressure is normal, the use of another gas appliance may cause a possible drop in gas pressure to the unit.
  • Page 86 Troubleshooting...
  • Page 87 Possible Fault Check method Causes Model Gas Type Offset -0.04"±0.01" NPE-150S -0.03"±0.01" -0.04"±0.01" NPE-180A NPE-180S -0.03"±0.01" -0.04"±0.01" NPE-210A NPE-210S -0.02"±0.01" -0.04"±0.01" NPE-240A NPE-240S -0.02"±0.01" Check the offset values for low fire Offset value for low fire Flame loss and noise occurs after ignition Replace the electrode or clean the fire detecting electrode.
  • Page 88 Possible Fault Check method Causes Check the tightness of the screw or ground bolt in the Chamber + SC heat exchanger. Cause: Screw or ground bolt in the chamber and SC heat exchanger can be loosened by the vibration or external impact when operating the boiler (water heater).

  • Page 89: 016Error

    5.1.4 016Error Error occurrence conditions and check items Error Description If the overheat controller on the heat exchanger is initiated during combustion/standby of the water heater, the system displays the 016E (manually cleared) message on the front panel. The water heater switches into Lock- Bimetal overheated Out, and performs post-purge continuously and operates the pump.
  • Page 90 Check method Fault Possible Causes Check method Check if the contact point of the overheat controller is defective. Defective overheat controller Use a multimeter to see if the resistance is normal (0.3Ω) or abnormal (∞). ● Defective safety device Overheat controller Check if the overheat controller wire is disconnected ( Normal 0.3Ω...
  • Page 91 Fault Possible Causes Check method 1. If the Max switch #1 of 1-1 is on, Set the switch to the normal operation position. Capacity setting 2. PCB DIP S/W capacity setting error can suddenly increase the hot water temperature. Check the PCB DIP S/W capacity setting.(refer to page 21) ●...

  • Page 92: 030Error

    5.1.5 030Error Error occurrence conditions and check items Error Description If the overheat controller on the top of the exhaust duct is initiated, the system displays the heat exchanger bimetal overheat message 30E (cleared manually) on the front panel. The water heater switches into Lock-Out, and performs post-purge continuously and operates the pump. Overheating controller operates when the temperature exceeds 230°F (110°C) for 10 minutes or over.
  • Page 93 Check method Fault Possible Causes Check method 1. The error occurs due to high exhaust gas temperature caused by a damaged or clogged heat exchanger. Heat exchanger Damaged or clogged overheated heat exchanger 2. Flush the heat exchanger to remove scale deposits. 3.

  • Page 94: 046Error

    5.1.6 046Error Error occurrence conditions and check items Is heat exchanger Check connector thermistor normally ( #1 and #2 of CON 6) operating? Is resistance 1 step: Flushing, Clean Filter within normal range? 2 step: Try to restart (refer to page 59) 3 step: Replace PCB Replace heat exchanger thermistor.

  • Page 95: 060Error

    5.1.8 060Error Error occurrence conditions and check items Error Description E060 This error message is displayed on the front panel if the wiring is disconnected or the Dual Venturi malfunctions. Dual Venturi error The water heater switches into Lock-Out, and performs post-purge continuously and operates the pump. 1.
  • Page 96 Check method Fault Possible Causes Check method 1. Disconnect all cables from the Dual Venturi. Defective Dual Venturi cable or harness 2. Using a multi-meter, test the Dual Venturi electrical wiring. 1. Turn off the power to the unit using the main power switch (do not use the front panel power button) and wait for 10 seconds.

  • Page 97: 109Error

    5.1.9 109Error Error occurrence conditions and check items Error Description The system checks the RPM signal after the fan starts to run, and displays the error message 109E (cleared manually) in the following cases: 1. If the RPM remains low or close to 0, the system determines RPM error, and the water heater switches into E109 Lock-Out (gas valve and ignition transformer locked).
  • Page 98 Check method Fault Possible Causes Check method 1. Check the power supply to the blower. Black+Red, approx. DC 127~184 V ● No fan operation 2. Replace the PCB if voltages are abnormal. (When replacing the PCB, turn off the unit and then wait for at least 10 seconds before proceeding.) 3.

  • Page 99: 110Error

    5.1.10 110Error Error occurrence conditions and check items Error Description The system senses the air volume and the RPM signal, and displays 110E on the front panel in the following cases: 1. When the initial fan auto-adjust is not performed. E110 Air pressure error 2.

  • Page 100: 407Error

    Check method Fault Possible Causes Check method 1. If 110E occurs intermittently during ignition or combustion, compare the standard RPM with the current RPM at Min / Max combustion (dip switch 1-1&1-2). If the current RPM is higher than normal, check the following: Abnormal flow of Air supply / exhaust vent for any blockages.

  • Page 101: 421Error

    5.1.12 421Error Error conditions and Check Items Error Description E421 Heat exchanger input If an error (open: 14°F (-10°C) or lower) in the heat exchanger input temperature sensor is detected, the system temperature sensor displays the 421E error on the front panel. If this occurs, the water heater initiates shutdown. open 1.

  • Page 102: 432Error

    5.1.13 432Error Error occurrence conditions and check items Error Description E432 Cold Water water If an error (open: 14°F(-10°C) or lower) in the cold water temperature sensor is detected, the system displays the temperature sensor 432E (cleared automatically) error message on the front panel. The water heater initiates shutdown mode. open 1.

  • Page 103: 434Error

    Check method Fault Possible Causes Check method Defective temperature Check if the cold water temperature sensor is open and if the connector is attached sensor connector properly. Defective sensor Measure the temperature sensor resistance. (Defective if it is 30kΩ or higher.) ●...
  • Page 104 Panel Test operation mode (WAV operation) Is the operation normal? Reset the unit Check connector motor resistance (CON8) (see page 52 for Wiring Diagram) Check method Fault Possible Causes Check method If an error occurs in the cascade system, disconnect the cascade cable and check the system in the following procedure: 1.
  • Page 105 Emergency measures for a blocked water adjustment valve * (refer to page 47 for Component Test mode information) 1. Switch off power, shut off water supply to the unit, and drain water from the unit. 2. Remove the top/bottom clips of the water adjustment valve. 3.

  • Page 106: 438Error ("A" Models Only)

    5.1.15 438Error ("A" models only) Error occurrence conditions and check items Error Description Connect the power, start the pump, and check if the system senses water flow. E438 If flow is not sensed after the pump has started, the system displays 438E (cleared automatically) on the front Pump error panel.
  • Page 107 Check method Fault Possible Causes Check method Check the current flow rate displayed on the front panel. Defective flow sensor The flow sensor is defective if the water flow displayed is 0.0 gal/min when the pump is operating or when water is discharged from the hot water tap. Pump Malfunction Direct water temperature sensor 1.

  • Page 108: 439Error

    5.1.16 439Error Error occurrence conditions and check items Error Description As one or more units are operating in the cascade system, if no flow is detected while the system opens the E439 water adjustment valve, the system considers it as a defective flow sensor. The system displays 439E (cleared Flow sensor error manually) on the front panel and switches the unit operation into the Lock-Out mode (gas valve and ignition transformer locked).
  • Page 109 Check method Fault Possible Causes Check method 1. Check if the water adjustment valve is opening/closing properly. Cold water supply No hot water flow 2. Check if the cold water line is frozen. error 3. Check if the cold water filter is clogged. 1.
  • Page 110 1. Drain water from the unit, then remove the 4 screws and 3. Blow air through the flow sensor. Check that the impeller retaining clips from the flow sensor. rotates freely. 2. Detach the 2 wire connectors that connect the flow sensor to the PCB.

  • Page 111: 441Error

    5.1.17 441Error Error occurrence conditions and check items Is the heat exchanger Replace heat exchanger outlet outlet thermistor thermistor operating normally? Resistance between #3 and #4 of CON 7 is from 0.437kΩ to 176kΩ at normal condition. Before measuring resistance of the thermistor, detach the connector from the PCB.
  • Page 112 Panel Test operation mode (Mixing valve operation) Is the operation normal? Reset the unit Check connector motor resistance (CON9) (see page 52 for Wiring Diagram) Check method Fault Possible Causes Check method 1. Check the operation of the mixing valve using the Component Test mode (refer to page 47).
  • Page 113 Emergency measures for a blocked mixing valve * (refer to page 47 for Component Test mode information) 1. Switch off power, shut off water supply to the unit, and drain water from the unit. 2. Remove the top/bottom clips of the mixing valve. 3.

  • Page 114: 515Error

    5.1.19 515Error Error occurrence conditions and check items Error Description If an error occurs in the internal circuit of the PCB (e.g., resistance, transistor or relay fault), the system displays E515 error 515E (cleared manually) on the PCB. 1. Defective PCB 2.

  • Page 115: 517Error

    5.1.20 517Error Error occurrence conditions and check items Are the DIP S/W on the Reset the unit PCB properly set? Change the DIP S/W to the proper settings 5.1.21 593Error Error occurrence conditions and check items Are the panel keys Reset the unit operating normally? Replace front panel...

  • Page 116: 594Error

    5.1.22 594Error Error occurrence conditions and check items Error Description E594 error If the communication is abnormal in parts of PCB, the system displays E594 on the PCB. Check items 1. Check the PCB. Check method Fault Possible Causes Check method 1.

  • Page 117: 736Error

    5.1.24 736Error Error occurrence conditions and check items Is the Ready-Link cascade Reset the unit cable properly installed on all units? Reconnect cascade wire 5.1.25 782Error Error occurrence conditions and check items Is the wiring from the 1 step: Reset the unit. front panel properly 2 step: If problem persists, connected to the PCB?

  • Page 118: 740Error

    5.1.26 740Error Error occurrence conditions and check items Error Description E740 If an error (under 2.2kΩ or over 122.2kΩ) in the outdoor sensor is detected continuously for 3 seconds, The Abnormal outdoor system displays the error message E740 on the front panel. If this occurs, the water heater changes the control sensor mode from Reset Curve Mode to Normal Mode.

  • Page 119: Troubleshooting Guide By Symptom

    5.2 Troubleshooting guide by symptom 5.2.1 Noise Error type Cause Check method Incorrect mounting to the wall or in an improper location. Defective installation Check for improper installation and reinstall the unit if necessary. ● Vibration caused due to defective blower. Vibration noise Check the blower.
  • Page 120 5.2.2 Water Temperature Issue Error type Cause Check method Front panel power off Hot water does not run if the front panel is switched off. The water heater does not work due to the defective flow sensor. The flow sensor impeller will not rotate if it contains excessive scale or debris. Clean ●...
  • Page 121 5.2.3 Circuit breaker operation Error type Cause Check method The circuit breaker trips immediately as soon as the power cord is plugged in the receptacle. Power supply Check the sheath of power cord, or if there is short-circuit. Check the components in order from the power transformer to the PCB. If the circuit breaker operates after repairs check the wiring of each part.

  • Page 122: Replacement Of Parts

    Figure 1 need a screwdriver that is at least 8 ~ 10 inches long. A flashlight and magnetic tip are also recommended. Navien recommends 5. Disconnect all wiring connectors from the PCB as shown in the use of a parts tray to hold small parts and screws. All of the Figure 2.
  • Page 123 7. Remove the old PCB and replace it with the new part. 4. Replace the old fuse with the new part. 8. Reattach all wiring connectors to the PCB. 5. Ensure that the new fuse is of an equivalent rating and that it is properly fixed inside the housing.

  • Page 124: Flame Rod

    6. Disconnect the wiring connector from the fan assembly, and 12. Reinstall the fan assembly to the bracket by using the then remove the 4 screws from the gas valve connection as mounting screw. shown in Figure 5 below. 13. Attach the gas valve connection back to the fan assembly by using the 4 screws as shown in Figure 5.
  • Page 125 6. Remove the flame rod wiring connector. 5. Disconnect the wiring connector from the Ignition Transformer (Figure 9). Figure 8 7. Remove the flame rod from the burner assembly and replace Figure 9 with the new part. 8. Reconnect the 2 ignition transformer insulated cables to the 6.
  • Page 126 6.2.6 APS 6. Remove the 2 screws that attaches the air pressure sensor to the burner assembly. 1. Turn off the gas supply to the unit. 7. Pull out the air pressure sensor. 2. Disconnect the unit from the power supply. 8.
  • Page 127 6. Remove the 4 screws located at the bottom of the unit that are attached to the gas valve. Figure 15 8. Remove the 4 screws directly from the bottom of the gas valve to remove the elbow. 9. Replace the O-ring where the gas valve assembly attaches to 7.
  • Page 128 6.2.8 Condensate Trap 7. Loosen the clip that secures the hose to the condensate trap, and then pull off the hose. 1. Turn off the gas supply to the unit. 2. Disconnect the unit from the power supply. 3. Turn off the water supply to the unit. 4.
  • Page 129 6.2.9 Flow Sensor 6. Pull out the flow sensor. 7. Replace with old flow sensor with the new part. 1. Turn off the gas supply to the unit. 8. Reinstall the flow sensor into the cold water inlet pipe and 2.

  • Page 130: Circulation Pump

    5. Remove the clip at the bottom of the buffer tank. 11. Turn on water supply, power supply, and gas supply to the unit. 12. Carefully open a hot water tap and ensure there are no leaks at the buffer tank connections. NOTE 1.
  • Page 131 5. Move the controller aside for better access to the Circulation 9. Disconnect the wiring connector at the pump assembly. Pump. 6. Remove the 2 screws from the bottom of the case. Figure 27 Figure 25 10. Carefully remove the pump. 7.
  • Page 132 18. Use the 4 screws at the bottom of the case to fix the pump to 5. Remove the 4 stainless steel clips from the connections (2 the unit. round clips and 2 flat clips). 19. Install front panel using 4 screws. 20.
  • Page 133 7. Remove the 3 buffer tank screws and pull out the buffer tank Figure 33 5. Remove the 2 stainless steel clips from the water adjustment valve connections. Figure 32 8. Replace with new 2-way valve. 9. Place the 2 round stainless steel clips and 2 flat stainless clips back onto the 2-way valve connections.

  • Page 134: Components Diagram And Part List

    7. Components Diagram and Part List 7.1 Case Assembly Components Diagram and Part List 133...
  • Page 135 Description Part # Remark Intake Air Duct Assembly 30008662B Intake Air Filter 20007667A 20019078C NPE-180A/210A/240A Case 20026559B NPE-150S/180S/210S/240S Air Pressure Sensor 30010346A Panel Bracket 20018388A 30008678B NPE-180A/210A/240A Cover 30011694A NPE-150S/180S/210S/240S Case Lower Bracket 20007643B 30011690D Power Switch 30009482A Front Panel...

  • Page 136: Burner Assembly(Npe-180A/ 210A/ 240A)

    7.2 Burner Assembly(NPE-180A/ 210A/ 240A) 19 20 17-1 11-1 Components Diagram and Part List 135...
  • Page 137 Description Part # Remark 30012711A NPE-180A Heat Exchanger Assembly 30012712A NPE-210A 30012713A NPE-240A Fan O-Ring (G50) 20003019A Fan Bracket(F) 20022095A Flow Sensor Assembly 30008571A Thermistor 30008366A Fan Braket(R) 20022096A 30009166A NPE-180A Cold Inlet Pipe 30010805A NPE-210A 30008446A NPE-240A O-Ring (Φ17.5x2.7t)

  • Page 138: Burner Assembly(Npe-150S/ 180S/ 210S/ 240S)

    7.3 Burner Assembly(NPE-150S/ 180S/ 210S/ 240S) 10 4 10 5 Components Diagram and Part List 137...
  • Page 139 Description Part # Remark Ignition Transformer 30010455A Fan Bracket (R ) 20022096A Thermistor 30009478A Exhaust 30015922A NPE-150S 30012711A NPE-180S Heat Exchanger Assembly 30012712A NPE-210S 30012713A NPE-240S 30214183A NPE-150S Ignitor 30012226A NPE-180S/210S/240S Packing (Φ26.5x2.4t) 20006868A 30014326A NPE-150S Heat Exchanger Outlet Pipe 30011519A NPE-180S 30011515A...

  • Page 140: Waterway Assembly(Npe-150S/ 180S/ 210S/ 240S)

    7.4 Waterway Assembly(NPE-150S/ 180S/ 210S/ 240S) 12-5 12-4 12-2 12-3 12-1 Description Part # Remark Buffer Tank 30009030A Hot Water Outlet Pipe Assembly 30008338A Pipe Adapter 20024496A O-RING (P20) 20017212A Thermistor (Red) 30008366A O-RING (P16) 20017210A Pipe Clip 20007733B Return Pipe Assembly 30008350A Pipe adapter 20024496A...
  • Page 141 Description Part # Remark O-RING (P20) 20017212A O-RING (P19) 20017211A Water Filter 30008171A Pipe Clip 20007733B Circulation Pump 30010780A Pump Air Seperator 30006831B Drain Plug 30008630A O-RING (P18) 20006947A Fastner 20017726A Water adjustment valve (WAV) 30008245A WAV Outlet Pipe Assembly 30008624A O-Ring (P16) 20017210A...

  • Page 142: Waterway Assembly(Npe-150S/ 180S/ 210S/ 240S)

    7.5 Waterway Assembly(NPE-150S/ 180S/ 210S/ 240S) Components Diagram and Part List 141...
  • Page 143 Description Part # Remark Bracket 20026489A Thermistor 30008366A Water Filter 30008171A Cold Water Inlet Adapter 30011597A O-Ring (P15) 20017217A Fastner 20007859A Flow Sensor 30011534A O-Ring (P16) 20017210A Flow Sensor Outlet Adapter 20025959A Outlet Adapter 20025961A Fastner 20017726A Water Adjustment Valve (WAV) 30011532A Inlet Adapter 20025962A...

  • Page 144: Fan(Gas) Assembly

    7.6 Fan(Gas) Assembly 9 15 9 10 9 11 9 14 9 13 9 10 9 10 [NPE-180S/180A/210S/210A/240S/240A] [NPE-150S] Components Diagram and Part List 143...
  • Page 145 Description Part # Remark 30009921A NPE-180S/180A Gas Adapter 30009922A NPE-210S/210A/240S/240A 30014329A NPE-150S Gas Pipe 30013323A NPE180S/180A 30008431A NPE-210S/210A/240S/240A Gas Connector 20018430A Gas Valve 30008429A Gas Inlet Adapter 20023809A 30015421A NPE-150S Fan Assembly 30008834A NPE-180S/180A/210S/210A/240S/240A Single Venturi 30014688A NPE-150S 30012770A NPE-180S/180A Dual Venturi 30008909A NPE-210S/210A/240S/240A...

  • Page 146: Inspection And Maintenance Schedule

    8. Inspection and Maintenance Schedule 8.1 Maintenance 3. Close the gas valve. This section describes various maintenance procedures that may need to be performed on the water heater from time to time. 8.1.1 Cleaning the Water Heater CAUTION Make sure the water heater is turned off and the power supply is disconnected before cleaning the water heater.
  • Page 147 Draining the water in the condensate trap 6. Remove the pump inlet filter from the bottom of the water heater. Referring to the below figures, place a bucket under the water heater and remove the cap from the bottom of the trap to drain collected condensate.

  • Page 148: Flushing The Heat Exchanger

    Close the “A” valve and open the “C” valve. 11. Disconnect all tubes. 12. Remove the cold water inlet filter from the water heater and clean out any residue. Navien Plumb 13. Reinsert the filter and ensure the filter cap is securely Easy Valve Kit tightened.

  • Page 149: Cleaning The Inlet Water Filter And Recirculation Inlet Filter

    8.1.4 Cleaning the Inlet Water Filter and 8.1.5 Cleaning the Air Intake Filter Recirculation Inlet Filter If the air intake filter becomes clogged by dust or lint, the water heater will cease to operate and “Error Code 10” will appear on To clean the filters: the front panel display.

  • Page 150: Annual Servicing

    8.2 Annual Servicing 5. Pull the filter out of the water heater. In order to maintain its safe and efficient operation, it is recommended that the water heater is serviced annually. CAUTION Servicing must be performed by a qualified service agency or gas supplier Inspection Visual inspection for general signs of corrosion...

  • Page 151: Inspection Report

    8.3 Inspection Report Inspection Items References Date: Date: Visual Inspection for General YES / NO Signs of Corrosion Checking and Adjusting the YES / NO Gas/Air Ratio Checking Flue Gas YES / NO Carrying Out a Water Leak YES / NO Test in Operation Carrying Out a Gas Leak Test YES / NO...

  • Page 152: Common Vent And Outdoor Vent Cover Installing

    9. Common Vent and Outdoor vent Cover Installing 9.1 Installing the Outdoor vent Cover WARNING This kit must be installed by a qualified installer in accordance with these instructions and all applicable codes and requirements of The outdoor vent cover gets hot during operation. Install ●...

  • Page 153: Installing Procedure

    9.2 Installing Procedure 3. Tighten the screws on the front of the water heater. 1. Remove the two Phillips screws on the top front of water heater. WARNING 2. Position the outdoor vent cover on top of the water heater Make sure the front cover of the water heater is securely and securely press it into the intake and exhaust collars as reattached to prevent any damages to the water heater.

  • Page 154: Choosing An Installation Location

    9.3 Choosing an Installation Location When choosing an installation location, you must ensure that the location provides adequate clearance for the water heater, adequate venting and drainage options, and sufficient access to gas, water, and electrical supplies. Before proceeding, read the water heater installation manual.

  • Page 155: Mounting Water Heater

    Navien water heaters come with a mounting bracket that is pre- drilled at 16 inches on center for easy installation on standard wall studs. If the strength of the wall is insufficient or if the framing is non-standard or uneven, reinforce the area before installing the water heater.

  • Page 156: Ventilation Flow

    9.5 Ventilation Flow Intake Air Flow Exhaust Gas Flow Installation the Outdoor Vent Cover...

  • Page 157: Common Venting

    Exhaust Model : NPE-150S, 180A, 180S, 210A, 210S, 240A, 240S When cascading the water heaters with other Navien water heaters, you can install a common venting system. Do not use common venting if the water heater is used in a cascading system with other manufacturer’s water heaters.
  • Page 158 One short radius elbow = 8 feet, One long radius elbow = 5 feet ● Total length (L) = W + H Model Total length (ft) Required Load NPE-180A NPE-210A NPE-240A (Total BTU/H) D= 3" D=4" D=5"...

  • Page 159: Installing The H2Air

    Navien H2Air+ is an add-on controller for the Navien Flow Switch (with cable) NPE-180A/240A water heaters. It adds input and output functions to the NPE-180A/240A water heaters for a combination application where space heating and domestic hot water (DHW) are supplied simultaneously.

  • Page 160: Installing The Device

    Refer to the following diagram for the product layout. 10.2 Installing the Device This section provides information required to install the H2Air+ add-on controller in an NPE-180A/240A water heater. WARNING Ensure that you have turned off the power to the water heater before installing the device.
  • Page 161 10.2.1 Basic Principles 10.2.2 Installing the Device in an NPE-180A/240A Water Heater The following diagram shows the basic operation of an NPE-180A/240A water heater system with the H2Air+ add-on Follow the instructions to install the Navien H2Air+ in an controller.

  • Page 162: Wiring The Device

    10.3 Wiring the Device 5. Install the H2Air+ onto the NPE-180A/240A water heater’s PCB tray. Align the latch at the back of the case with the front lip of the PCB tray. This section provides information required to plan and install the system wiring.
  • Page 163 Insert the fork connector into the contact. Then tighten the terminal screw with a screwdriver. Connecting the Outdoor Temperature Sensor Cable An outdoor temperature sensor is supplied with the Navien H2Air+ installation kit. Insert the exposed wire into the terminal. Then tighten the terminal screw with a screwdriver.

  • Page 164: Configuring The Device

    This section provides the information required to set the desired heater, use the 13-pin main control connector supplied with the options for the NPE-180A/240A water heater system with the Navien H2Air+ . Connect one end of the cable to the connector H2Air+ add-on controller.

  • Page 165: Configuring The Npe-180A/240A Water Heater

    This section provides information required to properly configure ● a swing check valve with vertical piping. the NPE-180A/240A water heater to setup and utilize the functions provided by the H2Air+ add-on controller. Install either a spring check valve or a swing check valve for ●...

  • Page 166: Parameter Table

    4. To return to the previous menu (R&D information menu), press With this option activated, the NPE-180A/240A water heater the [Reset] button once. monitors the pump operation. When it detects that a pump has not been used for a specific period, it runs the pump for a set duration.
  • Page 167 Pump Post Purge Time (P.06) NOTE This function is used to set the post purge time after a combustion cycle is completed. If no buttons are pressed for 10 seconds or if the Info ● button is pressed, the current parameter value will be saved To change the pump post purge time: automatically.
  • Page 168 Outdoor Reset Control (P07–P10) Outdoor Low Temperature Set-point (P.07) To change the outdoor low temperature set-point: The Outdoor Reset Control feature can be used to enhance energy efficiency while maintaining optimal heating performance. 1. In the Parameter information time mode, use the Up (+) or Outdoor Reset Control automatically changes the space heating Down (-) buttons to select P.07.
  • Page 169 Outdoor High Temperature Set-point (P.08) Heating MIN Set-point (P.09) To change the outdoor high temperature set-point: To change the heating MIN set-point: 1. In the Parameter information time mode, use the Up (+) or 1. In the Parameter information time mode, use the Up (+) or Down (-) buttons to select P.08.
  • Page 170 Heating MAX Set-point (P.10) 2-Stage T/S Output Heat-Capacity (P.11) To change the heating MAX set-point: Models with the 2-stage air handler control function (W1, W2) can use a 2-stage thermostat or can be automatically controlled by the 1. In the Parameter information time mode, use the Up (+) or H2Air+ controller (If the DIP switch # 3 is OFF).

  • Page 171: Maintenance

    10.6 Maintenance 10.7.3 NPE-180A/240A Pump P-Q Curve The Navien NPE-180A and NPE-240A water heaters that are used in the DHW/heating systems should be properly maintained and flushed on an annual basis. Please see the NPE Water Heater Service Manual for more details regarding annual servicing and maintenance.

This manual is also suitable for:

Npe-210aNpe-180sNpe-210sNpe-240sNpe-240aNpe-150s

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