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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

 

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.

The installation must conform with local codes or, in the absence of local codes, the National Fuel 

Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.

ALWAYS read and follow this manual 

completely before using the boiler. 

Save for future reference.

User’s Information Manual

NHB-H Condensing Boilers

Model

NHB-055H

NHB-080H

NHB-110H

NHB-150H

Summary of Contents for NHB-055H

Page 1: ...tely 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...

Page 2: ...9 3 3 Accessing Basic Menu Items 13 3 4 Resetting the Boiler 14 4 Maintaining the Boiler 15 4 1 Cleaning the Boiler 15 4 2 Draining the Boiler 15 4 3 Cleaning the Air Intake Filter 16 4 4 Protecting...

Page 3: ...uch as property damage DANGER If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life A This appliance does not have a pi...

Page 4: ...ler with the front cover opened Doing so may result in fire or carbon monoxide CO poisoning which may result in property damage personal injury or death Do not operate this boiler without proper venti...

Page 5: ...not use this boiler for anything other than its intended purpose as described in this manual Do not remove the front cover unless the power to the boiler is turned off or disconnected Failure to do so...

Page 6: ...al glass fuses and automatically cuts off the gas supply Lightning Protection Each boiler is specially grounded both internally and externally to protect against lightning strikes Auto Fan Detection T...

Page 7: ...is operating in Freeze Protection mode Auto air purge Displayed when an auto air purge is being performed e Cascade Main mode Flashes when configuring a cascade system Turns on solid if the boiler is...

Page 8: ...for the boiler s operation such as space heating and DHW supply temperatures Refer to the following table for detailed information a Back button Return to the previous menu or screen b Mode button En...

Page 9: ...llows the boiler to operate at up to 3 different temperatures This built in feature can be accessed from the front panel and eliminates the need for additional accessories that are typically required...

Page 10: ...n mode rotate the Command dial The space heating temperature is highlighted on the screen 2 Press the Command dial to select the space heating temperature The highlighted section will flash 3 Rotate t...

Page 11: ...dial to confirm the new temperature 5 Press and hold the Command dial for more than 2 seconds to return to normal operation mode or rotate the Command dial to adjust another zone s temperature Note T...

Page 12: ...erature range is 104 F 40 C Absolute MIN to 180 F 82 C Absolute MAX You can adjust the temperature ranges in the parameter settings menu The boiler will retain your settings during a power outage 3 2...

Page 13: ...AD values equal to or lower than 70 Flame Off 8bit AD values equal to or higher than 175 16 Fan Target RPM Set fan speed RPM 17 Fan Current RPM Fan speed RPM 18 Fan Target APS Set APS voltage V 19 Fan...

Page 14: ...2 Outdoor Reset Curve Outdoor reset curve load type displayed when the outdoor reset option 21 Outdoor Reset is enabled 1 Finned Tube Baseboard 2 FAN Coil 3 Cast Iron Baseboard 4 Low Mass Radiant 5 Hi...

Page 15: ...ure resistant but it is not waterproof Keep it as dry as possible 4 2 Draining the Boiler You will need to drain the boiler under certain circumstances such as when the boiler is not used for an exten...

Page 16: ...f the annual maintenance To clean the air intake filter 1 Press the Power button on the front panel to turn off the boiler 2 Disconnect the power supply to the boiler 3 Unfasten the 4 latches 2 at the...

Page 17: ...ectly The boiler is designed for indoor installation only To ensure that the boiler does not freeze follow these guidelines Do not unplug the power supply cord except for routine maintenance The boile...

Page 18: ...hat the boiler is frozen contact an authorized technician or licensed professional This boiler requires very little maintenance however a qualified technician should inspect the boiler at the beginnin...

Page 19: ...injury or death WARNING Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the boiler Failure to perform the service and maintenance co...

Page 20: ...valve weeping is the valve and not over pressurization of the system due to expansion tank waterlogging or undersizing Checking theWater System 1 Verify all system components are correctly installed a...

Page 21: ...following items A bucket that is 5 gallons or larger Cleaning solution diluted with water 3 hoses A water circulation pump 2 flush valves if not installed Inspecting the Ignition and Flame Detector E...

Page 22: ...r s literature for information about the circulation time 10 Rinse the cleaning solution from the boiler a Remove the free end of the drain tube from the bucket and place it in the condensate drain or...

Page 23: ...is the system in standby 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 th...

Page 24: ...ector E278 Ext Supply Sensor Not Detected Check sensor connections E279 Ext Return Sensor Not Detected Check sensor connections E291 Return Temp Exceeds Supply Check for reversed piping E302 Low Water...

Page 25: ...y only applies to the replacement of the heat exchanger and does not include labor shipping other parts delivery or installation In order to obtain this warranty the customer must pay the applicable p...

Page 26: ...e Product at water temperatures outside the factory calibrated temperature limits and or exceeding the maximum setting of the high limit control Subjecting the heat exchanger to pressures or firing ra...

Page 27: ...Memo...

Page 28: ......

Page 29: ...ww navieninc com installers Contact a licensed professional for the affected system for example a plumber gas fitter or electrician When you contactTechnical Support please have the following informat...

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