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5

Safety Information

DANGER

HOT

BURN

To prevent burns:

 

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Use the lowest operating temperature setting 
necessary to provide comfortably-hot water.

 

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If your household has children or elderly or 
disabled residents, consider using a lower 
temperature setting.

 

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Do not leave children, the elderly, or disabled 
persons unsupervised.

 

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Do not allow small children to play 
unsupervised in the bathroom.

 

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Do not allow anyone to change the water 
temperature while hot water is running.

 

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Read all the instructions in this manual 
carefully before changing the temperature 
setting.

 

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Feel the water before using it on children, the 
elderly, or the disabled.

 

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If it is necessary to set the water temperature 
above 125°F (52°C), consider installing a 
thermostatically-controlled mixing valve 
or temperature-limiting valve. Contact a 
licensed plumber or your local plumbing 
authority for more information.

CAUTION

 

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Do not attempt to repair or replace any 
part of the boiler, unless it is specifically 
recommended in this manual. 

For all other service, contact an authorized 
technician or licensed professional. Improper 
adjustments, alterations, service, or 
maintenance may lead to property damage, 
personal injury, or death and will void your 
warranty.

 

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Do not operate the boiler if you feel 
something is wrong with it.

 

Doing so may result in product damage or 
personal injury.

 

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Do not allow children to operate or access 
the boiler.

 

Doing so may result in product damage or 
personal injury.

 

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Do not turn on the boiler unless the water 
and gas supplies are fully opened.

 

Doing so may damage the boiler.

 

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Do not use this boiler for anything other 
than its intended purpose, as described in 
this manual.

 

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Do not remove the front cover unless 
the power to the boiler is turned off or 
disconnected.

Failure to do so may result in electric shock.

 

Ɣ

When servicing the controls, label all wires 
prior to disconnecting them.

Failure to do so may result in wiring errors, 
which can lead to improper or dangerous 
operation.

 

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Do not use unapproved replacement or 
accessory parts.

 

Doing so may result in improper or dangerous 
operation and will void the manufacturer’s 
warranty.

 

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Do not place anything in or around the vent 
terminals, such as a clothes line, that could 
obstruct the air flow in or out of the boiler.

 

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This boiler has been approved for use in the 
USA and Canada only.

 

Using the boiler in any other country will void 
the manufacturer’s warranty.

 

Ɣ

Should overheating occur or the gas supply 
fail to shut off, turn off the manual gas 
valve to the appliance.

Summary of Contents for NFC-250/200H

Page 1: ...ur gas supplier call the fire department Installationandservicemustbeperformedbyaqualifiedinstaller serviceagencyorthegas supplier Theinstallationmustconformwithlocalcodesor intheabsenceoflocalcodes t...

Page 2: ...On or Off 10 3 2 Adjusting the System Temperatures 10 3 3 Accessing Basic Menu Items 12 3 4 Resetting the Boiler 13 4 Maintaining the Boiler 14 4 1 Cleaning the Boiler 14 4 2 Draining the Boiler 14 4...

Page 3: ...pliance does not have a pilot It is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand B BEFORE OPERATING smell all around the appliance area...

Page 4: ...boiler with the front cover opened Doing so may result in fire or carbon monoxide CO poisoning which may result inpropertydamage personalinjury ordeath Do not operate this boiler without proper ventin...

Page 5: ...o property damage personal injury or death and will void your warranty Do not operate the boiler if you feel something is wrong with it Doing so may result in product damage or personal injury Do not...

Page 6: ...ater temperatures at or above 125 F 52 C can cause instant scalding severe burns or death Before you decide to change the temperature setting read the following charts carefully Water Temperature Time...

Page 7: ...n Each boiler is specially grounded both internally and externally to protect against lightning strikes Carbon Monoxide Protection The boiler is designed to maintain a safe air to gas ratio and combus...

Page 8: ...eeze 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 set as the Main unit in a cas...

Page 9: ...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 10: ...the boiler on or off press the Power button When the power is on the boiler automatically enters normal operation mode and the boiler s operating conditions are displayed on the screen Note The boile...

Page 11: ...on to return to normal operation mode or rotate the Command dial to adjust other operation conditions You can adjust the temperature while the highlighted section is flashing Once the flashing stops t...

Page 12: ...ter Pressure Water pressure psi 17 Flame Value Flame detector AD value Flame On 8bit AD values equal to or lower than 70 Flame Off 8bit AD values equal to or higher than 175 18 Fan Target RPM Set fan...

Page 13: ...xhaust temperature F 25 Outdoor Reset Outdoor reset status Enable Disable 26 Outdoor Reset Curve Outdoor reset curve load type displayed when the outdoor reset option 25 Outdoor Reset is enabled 1 Fin...

Page 14: ...t 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 extended period of ti...

Page 15: ...ded or as part of 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...

Page 16: ...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 o...

Page 17: ...boiler at the beginning of every heating season and or when there is a problem 4 4 Protecting the Boiler from Freezing CAUTION Damage due to freezing is not covered by the Navien limited warranty Fre...

Page 18: ...severe personal injury death or substantial property damage The boiler should be inspected annually only by a qualified service technician In addition the maintenance and care of the boiler must be pe...

Page 19: ...s Addressing the Reported Problems Inspect any problems reported by the owner and correct before proceeding Inspecting the Installation Area 1 Verify that boiler area is free of any combustible materi...

Page 20: ...er place of disposal Otherwise severe personal injury may result If no water flows valve is inoperative Shut down the boiler until a new relief valve has been installed 2 After following the above war...

Page 21: ...ted with water 3 hoses A water circulation pump 2 flush valves if not installed Note Before flushing the heat exchanger additional flush valves A and B must be installed on the near boiler piping incl...

Page 22: ...and allow 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 fre...

Page 23: ...Temperatures on page 10 Check for cross piping between the cold and hot water lines The water from the hot water faucet is too hot Is the set temperature set too high Check the boiler s temperature s...

Page 24: ...an motor Manual RESET E110 Abnormal air pressure Manual RESET E205 Abnormal operation heating supply thermistor Auto RESET E218 Abnormal operation heating return thermistor Auto RESET E278 Abnormal op...

Page 25: ...peration Pre Heat Aquastat Alarm E762 Abnormal flue gas duct Vent pipe not properly inserted Auto RESET E773 Using the wrong gas Parameter RESET E777 Abnormal operation LWCO limit external device Auto...

Page 26: ...eriod replacement of the Product or components may be authorized by Navien only Navien does not authorize any person or company to assume for it any obligation or liability in connection with the repl...

Page 27: ...ncluding but not limited to installation in violation of applicable rules laws or building codes inadequate water quality condensate damage improper venting incorrect gas type water pressure absence o...

Page 28: ......

Page 29: ...er 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 pane...

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