Noritz NC250-SV-ASME Owner's Manual
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Noritz NC250-SV-ASME Owner's Manual

Noritz NC250-SV-ASME Owner's Manual

Tankless gas water heater
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See also: Service Manual , Installation Manual
TANKLESS GAS WATER HEATER
Owner's Guide
WARNING
- 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.
CERTIFIED
R
Low NOx
Approved by
SCAQMD
Accepted For Use
City of New York
Department of Buildings
MEA 19-03-E
SBA8377
Rev. 09/09
Models : NC250-SV-ASME
NC250-DV-ASME
If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury, or death.
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
Completely fill out the warranty registration card (included separately) and
mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of the warranty registration card) where it
can be found whenever necessary.
Installation must conform with local codes, or in the absence of local codes,
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Noritz America reserves the right to discontinue, or change at any time, the
designs and/or specifications of its products without notice.
NORITZ America Corporation
*SBA8377*

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Summary of Contents for Noritz NC250-SV-ASME

  • Page 1 Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54. Low NOx Noritz America reserves the right to discontinue, or change at any time, the Approved by designs and/or specifications of its products without notice.

  • Page 2: Important Safety Information

    Important Safety Information-1 To prevent damage to property and injury to the user, the icons shown below will be used to warn of varying levels of danger. Every indication is critical to the safe operation of the water heater and must be understood and observed. Potential dangers from accidents during installation and use are divided into the following four categories.
  • Page 3 2. Turn off the power to the water heater will settle on the floor. 3. Turn off gas and water supply valve. WHAT TO DO IF YOU SMELL GAS. 4. Call the nearest Noritz agent • Do not try to light any appliance. Explosion Hazard ;...
  • Page 4 [When installing indoors (NC250-SV-ASME)] gas on the rating plate. Be sure Upper: Min. 12" Sug. 3" from to do. vent pipe* Left side: Ex. For Natural Gas (NC250-SV-ASME) Right side: Min. 6" Min. 6" Front: Sug. 24" NC250-SV-ASME [When installing indoors (NC250-DV-ASME only)] Sug.
  • Page 5 Consult the nearest Noritz agent if personal injury, or death. The qualified the water heater location needs to service agency is responsible for the proper be changed.
  • Page 6 This unit is only approved for installation blockage. up to 4500 ft. above sea level. For installations at higher elevations, contact Noritz Do not use parts other than those specified America for Instructions. for this equipment.

  • Page 7: Table Of Contents

    Contents Important Safety Information ............... 2 Contents ......................7 General Parts Main Unit ....................8 Remote Controller ..................9 Initial Operation ................... 10 How to Use Muting the Remote Controller ..............11 Setting and Using the Water Heater ............12 Flow Meter Alarm ..................

  • Page 8: General Parts

    General Parts Main Unit NC250-SV-ASME (Indoor/Outdoor Wall Mounted, Power Vented Model) Flue Collar Front Cover Air Inlet Water Drain Valve (with Water Filter) (Inside Water Inlet) p.20) Pressure Relief Valve Water Supply Valve Gas Supply Valve NC250-DV-ASME (Indoor Wall Mounted, Power Vent/Sealed Model)

  • Page 9: Remote Controller

    Remote Controller (RC-7649M) What is actually displayed depends on how the water heater is set. Burner On Indicator Setting Buttons When burning, the For setting the hot indicator is lit. water temperature, p.13 and 15) the flow meter alarm, and other settings. Priority Indicator When this indicator is lit, the hot water temperature...

  • Page 10: Initial Operation

    Open the water supply valve. OPEN CLOSED Open a hot water fixture to confirm that water is available, and then close the fixture again. Hot water fixture Open the gas supply valve. Turn on the power. Do not touch with wet hands. (Ex. NC250-SV-ASME)

  • Page 11: How To Use

    How to Use Muting the Remote Controller The remote controller will emit a sound when any button is pushed. This sound can be muted if it is desired. * Initial factory setting is with sound Hold the Power On/Off Button for five seconds. Muted Sound No sound...

  • Page 12: Setting And Using The Water Heater

    How to Use Setting and Using the Water Heater (Starting with the Power Off) Press the Power On/Off Button. The temperature will be displayed on the remote control thermostat. Previous set temperature (Ex.: 110°F) DANGER To prevent scalding: High Temperature Hot Water Heater temperatures over 125°F can cause severe burns instantly or death from scalding.
  • Page 13 Set temperature. Turn off the hot Turn on hot Always check the water. water. temperature setting before use. Cold Check the indicator lights. Water temperature The temperature settings below are examples. The temperature setting °F : necessary depends on the usage, the length of piping and the time of year. 105 110 115 120 125 130 135 140 145 150 160 170 180 Shower, hot water supply, Washing...

  • Page 14: Flow Meter Alarm

    How to Use Flow Meter Alarm (Starting with the power off) Set temperature. Press the Power Preparation Always check On/Off Button temperature setting before use. Plug the bath drain. Cold The temperature will be displayed on the remote control thermostat. Check the indicator lights.
  • Page 15 Water Temperature An alarm will sound for ten seconds when the flow The temperatures settings below are only examples. The °F : temperature setting necessary will depend on the usage, reaches the set level. the length of piping and the time of year. Warm Warmer The water will continue to run unless it is...

  • Page 16: Adjusting The Maximum Output Temperature

    How to Use Adjusting the Maximum Output Temperature * When 2 or more units are connected with a system controller, the upper limit function is disabled. The full range of temperature options will be available at all times. Change the Turn off the Press and hold the flow temperature using...

  • Page 17: Preventing Damage From Freezing

    * The freeze prevention heaters will not prevent the plumbing external to the unit from freezing. Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers. If there remains a freezing risk, contact the nearest Noritz agent. Take the measures below for extremely cold temperatures*.
  • Page 18 Preventing Damage from Freezing-2 If the water heater will not be used for a long period of time, Drain the water. Drain the water as follows: CAUTION To avoid burns, wait until the equipment cools down before draining the water. The appliance will remain hot after it is turned off.

  • Page 19: Regular Maintenance

    Check pressure relief valve. For water leaks from the Check equipment and piping. (Ex. NC250-SV-ASME) Periodic Maintenance Equipment Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to clean any stains. Remote Controller Wipe the surface with a wet cloth.

  • Page 20: Periodic Maintenance

    * The kit includes two full port isolation valves Hot Water and a pressure relief valve for the hot side. Service Valve Contact Noritz for more information. Cold Water Pressure Relief Valve Service Valve Drain Water Intlet Water Outlet (Ex.

  • Page 21: Troubleshooting

    Troubleshooting-1 Initial Operation • Check for reversed plumbing or crossed pipes. Unit does not attempt to ignite • Check the water drain valve filter. ( p.20 ) when water is running. Unit attempts to ignite but fails • Reset unit and try again. There may be air in the gas line. •...

  • Page 22: Amount Of Hot Water

    Troubleshooting-2 (Continued) • The unit will not heat the water if the flow rate is less than The water is cold when only a 0.5 GPM. single fixture is open. Open the fixture more or open other fixtures so that a greater flow passes through the unit, and the unit should begin heating again.
  • Page 23 ON or OFF, when opening or closing a fixture, or after the unit has been running for a while. [NC250-SV-ASME only] • The fan may run to prevent freezing. The fan can be heard when it is very cold outside.

  • Page 24: Water Quality

    Source: EPA National Secondary Drinking Water Total Dissolved Solids : 500 mg/L or less Regulations (40 CFR Part 143.3) Zinc : 5 mg/L or less Sulfate ion : 250 mg/L or less Residual chlorine : 4 mg/L or less * Maximum limit suggested by Noritz.
  • Page 25 Abnormal combustion, Have a professional check the gas supply pressure. low gas supply pressure Contact the nearest Noritz agent. Abnormal combustion Contact the nearest Noritz agent. Contact Noritz America if: • Any other error code appears.

  • Page 26: Follow-Up Service

    For repairs after the warranty period, there will be a charge on any service, and service will only be performed if the unit is deemed repairable. Period of Time for Stocking Repair Parts Noritz will stock repair and maintenance parts for this unit within twelve (12) years of the date of original installation. Reinstallation If you want to reinstall the appliance at a different location, confirm that the gas and power supply indicated on the rating plate are available at the new location.

  • Page 27: Gas Conversion

    This work must be performed by either Noritz or a qualified service agency and will be charged for even during the warranty period. The qualified installer will also be responsible for purchasing the gas conversion kit directly from the manufacturer.

  • Page 28: Specifications

    Specifications Specifications Item Specification Model Name NC250-SV-ASME Installation Type Indoor/ Outdoor, Wall Mounted Air Supply/Exhaust Power Vented Ignition Direct Ignition Operating Pressure 15-150 psi Minimum Flow Rate 0.5 GPM Dimensions 24.4"(Height) x 18.4"(Width) x 9.4"(Depth) Weight 62 lbs. Water Holding Capacity 0.3 Gallon...
  • Page 29 • Specifications may be changed without prior notice. • The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water temperature. Specifications Item Specification Model Name NC250-DV-ASME Indoor, Wall Mounted Installation Type Air Supply/Exhaust Direct Vent (Sealed Combustion) Direct Ignition Ignition Operating Pressure...

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Nc250-dv-asme

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