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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

 

Ɣ

Do not try to light any appliance.

 

Ɣ

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

 

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

 

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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.

Keep this manual near this boiler for future 
reference whenever maintenance or service 
is required.

NHB Condensing Boiler

User’s Information Manual

Model

NHB-055

NHB-080

NHB-110

NHB-150

Summary of Contents for NHB-150

Page 1: ...ce Ɣ Do not touch any electrical switch do not use any phone in your building Ɣ Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions Ɣ 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 Keep this manual near this boiler for future reference...

Page 2: ...Boiler On or Off 8 3 2 Adjusting the Temperature 8 3 3 Viewing Basic Information 9 3 4 Resetting the Boiler 10 4 Maintaining the Boiler 11 4 1 Cleaning the Boiler 11 4 2 Draining the Boiler 11 4 3 Cleaning the Air Intake Filter 12 4 4 Protecting the Boiler from Freezing 14 4 5 Maintenance Schedules 14 5 Troubleshooting 19 5 1 Solving Basic Problems 19 5 2 Understanding Error Codes 20 ...

Page 3: ...s supplier call the fire department Ɣ Do not return to your home until authorized by your gas supplier or the fire department C Do not use this appliance if any part has been under water 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 been under water The following safety symbols are used in this m...

Page 4: ...l to shut off turn off the manual gas valve to the appliance WARNING Ɣ Shut off the gas supply if the boiler is damaged Have your installer or plumber show you the location of the gas shut off valve and demonstrate how to close the valve If the boiler is damaged as a result of overheating fire flood or any other reason close the manual shut off valve and do not operate the boiler again until it ha...

Page 5: ...temperature and if necessary initiates a safety heating cycle to prevent internal equipment damage due to freezing temperatures Ɣ Short Circuit Protection Any short circuit occurring in the boiler s electrical circuit immediately blows the internal glass fuses and automatically cuts off the gas supply Ɣ Lightning Protection Each boiler is specially grounded both internally and externally to protec...

Page 6: ...operation Refer to the following table for detailed information a Space heating mode f S Supply water control Indicates space heating mode operation Indicates supply water control status b Error g R Return water control A code will appear on the display Indicates return water control status c Combusting h O R Outdoor Reset Indicates burner operation Indicates outdoor reset operation d DHW mode i P...

Page 7: ...iler s operation such as space heating and DHW supply temperatures Refer to the following table for detailed information k Diagnostics button n Up button For installers only Increases the temperature l MODE Mode button O Down button Changes the mode Decreases the temperature m Reset button p Power button Resets the boiler if an error occurs Turns the boiler on or off k l m n o p ...

Page 8: ...e default space heating return water temperature range is 86 F 30 C Absolute MIN to 149 F 65 C Absolute MAX Ɣ You can adjust the temperature range in the parameter settings menu Ɣ The boiler will retain your settings during a power outage 3 1 Turning the Boiler On or Off To turn the boiler on or off press the Power button for 0 3 seconds MODE When the power is on the boiler supply water temperatur...

Page 9: ...w mass radiant 5 High mass radiant 6 Radiator 7 Custom set by installer 3 2 2 Adjusting the DHW Indirect Supply Temperature To adjust the water temperature 1 Press the Mode button twice The DHW mode icon turns on 2 Press Up or Down buttons until the desired temperature appears on the display MODE You can adjust the temperature while the display is flashing Once the display stops flashing the tempe...

Page 10: ...hooting section of this manual or contact Technical Support at 1 800 519 8794 Display Description psi O R S R Pri Boost interval time set by installer psi O R S R Pri Space heating water pressure in PSI psi O R S R Pri DHW priority time psi O R S R Pri System supply water temperature F with optional temperature sensor psi O R S R Pri System return water temperature F with optional temperature sens...

Page 11: ...re resistant but it is not waterproof Keep it as dry as possible 4 2 Draining the Boiler You will need to drain the boiler before performing maintenance tasks such as to prevent the boiler from freezing when it will not be used for an extended period Refer to 2 2 Parts of the Boiler on page 5 for details about part locations To drain the boiler 1 Place a bucket under the boiler to collect the resi...

Page 12: ...clean the air intake filter every 3 4 months To clean the air intake filter 1 Press the Power button on the front panel to turn off the boiler MODE 2 Disconnect the power supply to the boiler 3 Remove the front cover of the boiler 5 Remove the drain cap on the manifold system to drain the boiler Drain Cap Drain Cap Note Ɣ Place a bucket under the boiler to gather water released from the manifold s...

Page 13: ... of the boiler 6 Remove the filter from the plastic assembly Dust and rinse it with clean running water 7 Allow the filter to dry completely 8 Place the filter assembly back into the boiler and secure it with the screw 9 Replace the front cover 10 Reconnect the power supply to the boiler 11 Press the Power button on the front panel to turn on the boiler ...

Page 14: ... damages due to freezing The installer is responsible for ensuring that there is sufficient make up air to avoid such a situation and the owner is responsible for ensuring that protection against freezing is maintained Ɣ To avoid freezing issues we strongly recommend the use of adirectventexhaustandintakesystem Yourinstallershould ensure that the exhaust vent pipe and the air intake pipe are both ...

Page 15: ... service and maintenance could result in damage to the boiler or system Ɣ Failure to follow the directions in this manual and component literature could result in severe personal injury death or substantial property damage Ɣ The boiler should be inspected annually only by a qualified service technician In addition the maintenance and care of the boiler must be performed to assure maximum boiler ef...

Page 16: ...onents over time rendering the valve inoperative Such conditions are not detectable unless the valve and its components are physically removed and inspected This inspection must only be conducted by a plumbing contractor or authorized inspection agency not by the owner Failure to re inspect the boiler relief valve as directed could result in unsafe pressure buildup which can result in severe perso...

Page 17: ... clean Review with the Owner 1 Review the User s Information Manual with the owner 2 Emphasize the need to perform the maintenance schedule 3 Remind the owner of the need to call a licensed contractor should the boiler or system exhibit any unusual behavior 4 Remind the owner to follow the proper shutdown procedure and to schedule an annual start up at the beginning of the next heating season Flus...

Page 18: ...minutes d Close the B valve and open the D valve 11 Disconnect all tubes and valves 12 Reconnect the power supply to the boiler 13 Press the Power button on the front panel to turn on the boiler To flush the Heat Exchanger A B C D System Supply System Return Circulation Pump Flushing Kit Navien Manifold System Pump in Manifold System 1 Press the Power button on the front panel to turn off the boil...

Page 19: ... the system in stand by Make sure the power is on and plugged into the outlet with the correct voltage Press the Power button and raise the setting temperature Make sure the boiler is turned on Is the system running for domestic hot water DHW When the unit is heating for DHW the heating side does not work 5 Troubleshooting 5 1 Solving Basic Problems If you experience a problem with the boiler refe...

Page 20: ...r On reset E205 Abnormal operation heating supply thermistor Auto reset E218 Abnormal operation heating return thermistor Alarm E271 Temperature differential limit Alarm E278 Abnormal operation system supply thermistor Alarm E279 Abnormal operation system return thermistor Alarm E291 Supply Return inversion limit Manual reset Power On reset E302 Low water pressure Manual reset E352 High water pres...

Page 21: ...duct If the original installer cannot be identified the end user or homeowner may contact Navien s Technical Administration Department at 800 519 8794 Proof of purchase is required to obtain warranty service Warranty Service At its option Navien will replace the defective component part s or heat exchanger in accordance with the terms of this Limited Warranty if it fails in normal use and service ...

Page 22: ...F NAVIEN HAD OR SHOULD HAVE HAD ANY KNOWLEDGE ACTUAL OR CONSTRUCTIVE OF THE POSSIBILITY OF SUCH DAMAGES Warranty Exclusions Navien s Limited Warranty shall be void in the event of an occurrence of any of the following Ɣ Improper installation failure to install in strict compliance with the Installation Operation Manual procedures installed by a non licensed installer and installation in violation ...

Page 23: ...Memo ...

Page 24: ... Ɣ 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 Ɣ Model number Ɣ Serial number Ɣ Date purchased Ɣ Installation location and type Ɣ Error code if any appears on the front panel display 800 519 8794 www Navien com 20 Goodyear lrvine CA 92618 NHB Condensing Boiler User s In...

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