Navien NHW700 User's Information Manual
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Navien NHW700 User's Information Manual

Non-condensing water heaters
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User's Information Manual
NHW700 Non-Condensing Water Heaters
Getting Service
If your water heater requires service:
All repairs require pre-authorization by Technical Support.
●
Request for your installer or any licensed professional to contact Technical Support at
●
1-800-519-8794 Option 2 once at the installation site.
A short list of independent service providers in your area can be found on the website:
●
www.navieninc.com/installers.
Contact a licensed professional for the affected system (for example, a plumber, gas fitter,
●
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
●
800.519.8794
www.navieninc.com
20 Goodyear lrvine, CA 92618
T A N K L E S S
W A T E R
H E A T E R S
Version: 1.0 (August, 2023)
·
B O I L E R S

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Summary of Contents for Navien NHW700

  • Page 1 User’s Information Manual NHW700 Non-Condensing Water Heaters Getting Service If your water heater requires service: All repairs require pre-authorization by Technical Support. ● Request for your installer or any licensed professional to contact Technical Support at ● 1-800-519-8794 Option 2 once at the installation site.
  • Page 2 User’s Information Manual NHW700 Non-Condensing Water Heaters Model NHW700-160AI/180AI/199AI NHW700-160AE/180AE/199AE ALWAYS read and follow this manual completely before using the water heater. Save for future reference. Tested and Certified to NSF/ANSI 372 for lead free* compliance. * The wetted surface of this product contacted by consumable * Lead Free water contains less than one quarter of one percent (0.25%) of...

  • Page 3: Table Of Contents

    4.3 Flushing the Heat Exchanger 4.4 Cleaning the Inlet Water Filter 4.5 Protecting the Water Heater from Freezing 20 5. Troubleshooting 5.1 Solving Basic Problems 6. LIMITED WARRANTY NAVIEN, INC. 23 Product Installation Information Model Date Purchased Gas Type Serial Number...

  • Page 4: Important Safety Information

    1. Important Safety Information The following Safety Alert Symbols are used in this WARNING manual. They are used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible serious To prevent death, serious injury, or property injury or death.
  • Page 5 DANGER DANGER This water heater 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.
  • Page 6 WARNING WARNING To prevent death, serious injury, or property To prevent death, serious injury, or property damage: damage: Do not operate this water heater without ● proper venting. Doing so may result in fire or carbon monoxide (CO) poisoning, which may result in property damage, personal injury, or death.
  • Page 7 CAUTION CAUTION Do not attempt to repair or replace any part This water heater has been approved for use ● ● of the water heater, unless it is specifically in the USA only. recommended in this manual. Using the water heater in any other country For all other service, contact an authorized will void the manufacturer’s warranty.

  • Page 8: About The Water Heater

    2. About the Water Heater 2.1 Description of the Water Heater The NHW700-A series water heater is available in Exhaust Gas 6 models: NHW700-160AE, NHW700-180AE, NHW700-199AE, NHW700-160AI, NHW700-180AI and NHW700- 199AI. I (Interior): For INDOOR use ONLY ● E (Exterior): For OUTDOOR use ONLY ●...

  • Page 9: The Front Panel (Indoor Models Only)

    2.3 The Front Panel (Indoor Models Only) 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 10: Remote Controller (Outdoor Models - Optional For Indoor Models)

    2.4 Remote Controller (Outdoor Models - Optional for Indoor Models) LED indicator LCD display LCD display LED indicator Indicates the status of Indicates functions and Indicates functions and Indicates the status of water water heater. current status. current status. heater. - Green: Normal Mode.

  • Page 11: Operating The Water Heater

    3. Operating the Water Heater WARNING To prevent death, serious injury or property damage: Ensure that the water heater is filled with ● water before turning on the water heater. If overheating occurs or the gas supply fails to ● shut off, shut off the gas supply to the water heater at the manual gas valve.

  • Page 12: Adjusting The Water Temperature

    3.2 Adjusting the Water Temperature WARNING Before adjusting the water temperature, read “To prevent burns:” on page 4 carefully. Water temperatures above 120 °F can cause instant scalding, severe burns, or death. The water heater is set to 120 °F (49 °C) by default. To adjust the water temperature: 1.

  • Page 13: Viewing Basic Information (Indoor Models Only)

    3.3 Viewing Basic Information 3.4 Resetting the Water Heater (Indoor Models Only) If an error message appears, you can try resetting the water heater to resolve the problem. To reset the To view information about the water heater, press water heater, press the Reset button. the Information button.

  • Page 14: Entering Lock Mode

    3.5 Entering Lock Mode 3.6 Setting the Clock To prevent accidental pressing of the buttons and to 1. Press the Preheat & Timer button for 2 seconds. prevent children from adjusting the controller, you can activate the Temperature Lock Mode. To activate or deactivate Lock Mode, press the Lock button for 2 seconds.

  • Page 15: Setting The Recirculation Timer

    4. Press the OK button to finish and save the 2. Set the recirculation activation time by pressing updated time. the Up or Down button. Then, press the OK button to set the deactivation time. The recirculation timer settings are Note 3.7 Setting the Recirculation divided in 30 minute increments.

  • Page 16: Starting Recirculation

    3.8 Starting Recirculation 4. Press the OK button to save the timer setting. Repeat these procedures for Reservation Press the Preheat & Timer button to start Schedule Settings #2 and #3. recirculation immediately, regardless of the reservation schedule. “HEAT” appears for 4 seconds on the display and then recirculation runs once.

  • Page 17: Maintaining The Water Heater

    4. Maintaining the Water Heater 4.1 Cleaning the Water Heater WARNING Make sure the water heater is turned off and the power supply is disconnected before cleaning the water heater. The water heater may remain hot for several minutes after it is turned off. To prevent burns, wait until the water heater has cooled down before cleaning.
  • Page 18 4. Close the water supply valve on the inlet to the 7. Open the pump drain plug. water heater. If there is no valve, turn off the 8. Remove the cold water inlet filter. water supply at the water main. 9.

  • Page 19: Flushing The Heat Exchanger

    Moderately 4-7 grains/gal Water Once/Year procedure, contact an authorized technician Hard (61-120 mg/L) Softener** or licensed professional. Keep in mind that or Navien 7-9 grains/gal PeakFlow is improper maintenance can void your warranty. Hard (121-160 mg/L) Recommended Water Softener** About Water Quality...
  • Page 20 Close the “A” valve and open the “C” valve. 11. Disconnect all tubes. 12. Remove the cold water inlet filter from the water Navien Plumb heater and clean out any residue. Easy Valve Kit 13. Reinsert the filter and ensure the filter cap is securely tightened.

  • Page 21: Cleaning The Inlet Water Filter

    Inlet Filter in the building. This is not a manufacturing defect, and therefore, Navien will not warrant any damages due to freezing. The installer is responsible for ensuring that there is sufficient make-up air to avoid such...
  • Page 22 To ensure that the water heater does not freeze, 3. Open the hot water faucet that is closest to the follow these guidelines: water heater. Do not unplug the power supply cord, except ● 4. Use a hair dryer or a portable electric heater to for routine maintenance.

  • Page 23: Troubleshooting

    5. Troubleshooting 5.1 Solving Basic Problems If you experience a problem with the water heater, refer to the following chart for possible remedies. Error codes that appear on the front panel display are explained in the following section. For minor problems, resetting the water heater may resolve the issue.

  • Page 24: Limited Warranty Navien, Inc

    (3) years as indicated in warranty will be voided. the Warranty Coverage Periods table. Navien will pay labor charges for the repair subject to Navien’s prior written approval and in accordance with Navien’s schedule of approved labor allowances for a period of one (1) year from the date of installation.
  • Page 25 Navien. At Navien’s request, the defective Product high limit control. or part must be returned to Navien. When the Subjecting the heat exchanger to pressures or ● Product is installed in new construction, the date...
  • Page 26 BY STATE LAW IS LESS. No one is authorized to make any other warranties on behalf of Navien. Some states do not allow the exclusion or limitation of incidental or consequential damages, or how long an implied warranty lasts, so the above limitation may not apply to you.
  • Page 27 Memo...

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