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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

 

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Do not try to light any appliance.

 

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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.

The installation must conform with local codes or, in the absence of local codes, the National Fuel 
Gas Code, ANSIZ223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.

H

User’s Information Manual

NHB Condensing Boilers

Model

NHB-055

NHB-080

NHB-110

NHB-150

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

Summary of Contents for NBH Series

Page 1: ...our 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...

Page 2: ...oiler On or Off 9 3 2 Adjusting the Temperature 9 3 3 Viewing Basic Information 10 3 4 Resetting the Boiler 11 4 Maintaining the Boiler 12 4 1 Cleaning the Boiler 12 4 2 Draining the Boiler 12 4 3 Cle...

Page 3: ...tment 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 co...

Page 4: ...er using a lower temperature setting Do not leave children the elderly or disabled persons unsupervised Do not allow small children to play unsupervised in the bathroom Do not allow anyone to change t...

Page 5: ...ler in any other country 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 WARNING Shut off the gas suppl...

Page 6: ...e temperature and if necessary initiates a safety heating cycle to prevent internal equipment damage due to freezing temperatures Short Circuit Protection Any short circuit occurring in the boiler s e...

Page 7: ...n 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 wa...

Page 8: ...ler 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...

Page 9: ...olute MIN to 149 F 65 C Absolute MAX You can adjust the temperature range in the parameter settings menu The boiler will retain your settings during a power outage WARNING Follow the instructions belo...

Page 10: ...ting the DHW Indirect Supply Temperature WARNING Before adjusting the water temperature read To prevent burns on page 4 carefully Water above 120 F can cause instant scalding severe burns or death To...

Page 11: ...Troubleshooting section of this manual or contact Technical Support at 1 800 519 8794 Display Description psi O R S R Boost interval time set by installer psi O R S R Space heating water pressure in...

Page 12: ...e 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 freezin...

Page 13: ...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 Remov...

Page 14: ...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...

Page 15: ...ringdefect andtherefore Navienwillnotwarrant any 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 respo...

Page 16: ...emove and clean space heating strainer Remove and clean inlet water filter 4 5 Maintenance Schedules Regular maintenance is required to operate the boiler safely Refer to the maintenance schedules bel...

Page 17: ...aminants listed in Installation Operation Manual If any of these are present in the boiler intake air vicinity they must be removed If they cannot be removed reinstall the air and vent lines per the I...

Page 18: ...ring 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 o...

Page 19: ...iring making sure wires are in good condition and securely attached Checking the Control Settings 1 From the front panel enter the Diagnostics Mode and check all settings Adjust settings if necessary...

Page 20: ...llow the solution to circulate through the boiler Refer to the manufacturer s literature for information about the circulation time 10 Rinse the cleaning solution from the boiler a Remove the free end...

Page 21: ...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...

Page 22: ...eration heating supply thermistor Auto reset E218 Abnormal operation heating return thermistor Alarm E271 Temperature differential limit Alarm E278 Abnormal operation system supply thermistor Alarm E2...

Page 23: ...at issue The replacement component or product will be warranted only for the unexpired portion of the applicable warranty period for the original component or Product The heat exchanger is covered by...

Page 24: ...tion for non recommended uses failure to follow or comply with the User s Operational Manual etc Improper maintenance including but not limited to scale buildup vent blockage failure to maintain etc M...

Page 25: ...Notes...

Page 26: ......

Page 27: ...tact 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 Da...

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