background image

* Lead Free

Keep this manual near this water heater for future reference 

whenever maintenance or service is required.
*  The wetted surface of this product contacted by 

consumable water contains less than one quarter of one 

percent(0.25%) of lead by weight.

Model

NPE-180A/ 210A/ 240A
NPE-180S/ 210S/ 240S

Operation 

Manual

Condensing Water Heater

WARNING

If the information in these instructions is not followed exactly, a fire or explosion may result, causing 

property damage, personal injury, or death.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any 

 

other appliance.

WHAT TO DO IF YOU SMELL GAS

 

Do not try to light any appliance.

 

Do not touch any electrical switch; do not use any phone in your building.

 

Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

 

If you cannot reach your gas supplier, call the fire department.

 

Installation and service must be performed by a qualified installer, service agency or the gas 

 

supplier.

Summary of Contents for NPE-180A

Page 1: ...d exactly a fire or explosion may result causing property damage personal injury or death Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHATTO DO IFYOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Foll...

Page 2: ...er Temperature 8 3 3 Viewing Basic Information 9 3 4 Resetting the Water Heater 9 4 Maintaining the Water Heater 10 4 1 Cleaning the Water Heater 10 4 2 Draining the Water Heater 10 4 3 Flushing the Heat Exchanger 11 4 4 Cleaning the Inlet Water Filter and Recirculation Inlet Filter 12 4 5 Cleaning the Air Intake Filter 13 4 6 Protecting the Water Heater from Freezing 14 5 Troubleshooting 15 5 1 S...

Page 3: ...turn the gas control knob C Neverusetools Iftheknobwillnotpushinorturnbyhand don ttrytorepairit callaqualifiedservicetechnician Force or attempted repair may result in a fire or explosion Do not use this appliance if any part has been under water D Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has be...

Page 4: ...scald risk Before setting the temperature at or above 125 F 52 C consider installingathermostatically controlledmixingvalveortemperature limiting valve Contact a licensed plumber or your local plumbing authority for more information DANGER HOT BURN To prevent burns Use the lowest operating temperature setting necessary to provide comfortably hot water If your household has children or elderly or d...

Page 5: ...try will void the manufacturer s warranty Should overheating occur or the gas supply fail to shut off turn off the manual gas valve to the appliance Do not use this appliance if any part has been under water Immediately call a qualifed service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water WARNING Shut off the gas su...

Page 6: ...ection h Condensate Drain Connection 2 1 Description of the Water Heater The NPE series water heater is available in 6 models NPE 180A NPE 180S NPE 210A NPE 210S NPE 240A and NPE 240S The main features are as follows Potable domestic hot water combination space heating and commercial applications Maximum temperature 182 F 83 C Dual stainless steel Heat Exchangers with stainless steel piping Built ...

Page 7: ... Error g Master Unit A code will appear on the display Cascade operation b Hot Water Recirculation h Display Recirculation Mode c Diagnostics button i Up button For installers only Increases the temperature d Information button j Down button Shows basic information Decreases the temperature e Reset button k Power button Resets the water heater When an error occurs Turns the water heater on or off ...

Page 8: ...stops flashing the temperature setting is stored Note The water heater will retain your settings during a power outage You can adjust the temperature by the below 10 degree increments depending on the temperature range Temperature range Adjusting the water temperature 98 F 120 F Fahrenheit mode 36 C 50 C Celsius mode 1 F or 0 5 C increments 120 F 140 F Fahrenheit mode 50 C 60 C Celsius mode Press ...

Page 9: ... down button simultaneously for 10 seconds HIGH appears on the display To exit Commercial Mode Press the up and down button simultaneously for 10 seconds LoW appears on the display Note To adjust the temperature press the up button for 5 seconds to adjust in 10 F 5 C increments Commercial Warranty Applies when this mode is used Refer to the Warranty for more details 3 3 Viewing Basic Information T...

Page 10: ...You need to drain the water heater before performing maintenance tasks such as cleaning the inlet water filter or to prevent the water heater from freezing when it will not be used for an extended period Refer to the 2 2 Parts of the Water Heater on page 6 for details about part locations To drain the water heater Place a bucket under the water heater to collect the residual 1 water inside the wat...

Page 11: ...ns or larger Cleaning solution diluted with water 3 hoses A water circulation pump To flush the Heat Exchanger A A B B C C D D Navien Easy valve Kit Cold Water Line Hot Water Line Circulation Pump Flushing Kit Remove the recirculation inlet filter from the bottom of the 6 water heater A model only Recirculation Inlet Filter A model only Pump Drain Plug A model only Cold Water Inlet Filter Open the...

Page 12: ...rever the water heater drains b Close the B valve and open the D valve Do not open the C valve yet c Allow water to flow through the water heater for 5 minutes d Close the A valve and open the C valve Disconnect all tubes 11 Remove the cold water inlet filter from the water heater and 12 clean out any residue Reinsert the filter and ensure the filter cap is securely 13 tightened Reconnect the powe...

Page 13: ...n on the front panel to turn on the water 12 heater 4 5 Cleaning the Air Intake 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 the front panel display To properly maintain the water heater you should clean the air intake filter every 3 4 months To clean the air intake filter Press the Power button on the front...

Page 14: ...y recommend the use of a direct vent exhaust and intake system Your installer should ensure that the exhaust vent pipe and the air intake pipe are both connected directly from the collars on the top of the water heater to the outdoors This type of vent system minimizes air movement within the water heater This water heater has an optional recirculation mode that is used for freeze protection This ...

Page 15: ... the cold water inlet filter See 4 4 Cleaning the Inlet Water Filter and Recirculation Inlet Filter on page 12 Open the hot water faucet completely If an error code is displayed refer to 5 2 Understanding Error Codes on page 16 It takes too long for hot water to reach the fixtures Are you using the external recirculation mode Have a contractor install a recirculation return line from the furthest ...

Page 16: ... air filter See page 13 E407 Hot water outlet thermistor open or short circuit Contact Technical Support at 1 800 519 8794 E421 Cold water inlet1 thermistor open or short circuit Contact Technical Support at 1 800 519 8794 E432 Cold water inlet2 thermistor open or short circuit Contact Technical Support at 1 800 519 8794 E434 Abnormal operation water adjustment valve Contact Technical Support at 1...

Page 17: ... installation site or any accidental or intentional damage to the Product Any damage caused by local adverse conditions including but not limited to hard water deposits lime or mineral build up operating in corrosive atmospheric elements Damage or problems caused by gas flow issues electrical surges flooding fire abnormal external temperature and any other cause of damage not directly caused by a ...

Page 18: ...on outside the United States and Canada Removal or alteration of the rating plate OtherTerms This Limited Warranty is subject further to the terms and conditions set forth herein and as may be further specified in the Terms and Conditions page located on Navien s website at www navienamerica com WITH THE EXCEPTION OF THIS LIMITED WARRANTY NAVIEN DISCLAIMS ANY OBLIGATION OR LIABILITY WITH RESPECT T...

Page 19: ......

Page 20: ...ww navienamerica com For warranty service always contact Technical Suppor t Contact the technician or professional who installed your water heater Contact a licensed professional for th ected 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...

Reviews: