Noritz N-0751M Owner's Manual
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Noritz N-0751M Owner's Manual

Tankless gas water heater
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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
SAR8558-2
Rev. 03/08
Model N-0751M
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
*SAR8558 T*

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  • Page 1 Read this manual completely for operation instructions. Completely fill out the warranty registration card (included separately) and CERTIFIED mail the detachable portion to Noritz America Corporation. Keep this manual (and the remainder of the warranty registration card) where it Low NOx can be found whenever necessary.

  • 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 (Continued) Do not use the water heater if Do not allow anyone to change the the exhaust pipe is displaced, water temperature while hot water is has holes, is clogged or is being used. Prohibited Prohibited corroded. To prevent scalding, do not change the wa- ter temperature to a higher setting.
  • Page 4 Important Safety Information (Continued) Do not use combustible chemicals Do not place the exhaust vent terminal in an indoor environment by means of such as oil, gasoline, benzene etc. in the near the heater or the exhaust adding walls and ceiling (Do not en- Prohibited Prohibited close using corrugated sheets, etc.)
  • Page 5 (Continued) Do not use hair spray or spray Contact a qualified service detergent in the vicinity of the technician for any necessary heater. repairs, service or maintenance. Prohibited Don’t disassemble the equipment. Do not allow small children to play unsupervised in the bathroom. Contact Noritz before using with Do not allow small children to a solar pre-heater.
  • Page 6 Important Safety Information CAUTION This unit is only approved for installation Do not drink water that has been inside the up to 4500 ft. above sea level. unit for an extended period of time. Do not drink the first use of hot water from the For installations at higher elevations, contact Noritz unit in the morning.

  • 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 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 * The above illustration shows an example of installation. The exact installation configuration may be slightly different.

  • 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

    Initial Operation Before the first use of your water heater, make the following preparations. 1 through 4 Follow steps Open the water supply valve. OPEN CLOSED Open a hot water fixture to confirm that water is available, and then close the fixture again.

  • 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. The maximum output temperature Contact the installer or Noritz America can be set using the remote...

  • 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. 1. 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 Change the Press and hold the flow Turn off the temperature using meter alarm set button until power. the setting buttons. a sound is heard (2 sec.). Tone sounds after 2 sec. Down The upper limit of the hot- water supply temperature can...

  • Page 17: Preventing Damage From Freezing

    Preventing Damage from Freezing-1 CAUTION * Damage can occur from frozen water within the device and pipes even in warm environments. Be sure to read below for appropriate measures. * Repairs for damage caused by freezing are not covered by the warranty. Freezing is prevented within the device automatically by the freeze-prevention heater Freezing cannot be prevented when the power plug is unplugged.

  • Page 18: Turning The Unit Back On

    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

    Regular Maintenance-1 Periodic Inspection CAUTION To prevent burns or scalding, turn off the power button and wait until the equipment cools before performing maintenance. Be sure to do. For dust and soot in Check For laundry, newspaper, timber, Check the exhaust vent or oil, spray cans and other exhaust vent terminal.

  • Page 20: Periodic Maintenance

    Regular Maintenance-2 Periodic Maintenance Water Drain Valve (with Water Filter) If the water drain valve (with water filter) is covered with debris, the hot water may not run smoothly, or the unit may put out cold water. Check and clean the filter as explained below. * To avoid burns, wait until the equipment cools down before draining the water.

  • 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 gallons per minute. 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: Remote Controller

    Remote Controller • Has there been a power failure? The light on the power button does not come on. • Is the power connected properly? The water temperature changes • The temperature setting and the flow meter alarm setting after a power failure or when the may both need to be reset after a power outage.

  • Page 24: Error Code Cause

    Troubleshooting-3 (Continued) • This is harmless. Small bubbles appear as the air in the The hot water is turbid. water is heated and depressurized rapidly to atmospheric pressure. • Coloration to a blue color may be noticed from small The water appears blue traces of copper ion contained in the water and fat The bath tub/wash-basin has turned (furring).

  • Page 25: Follow-Up Service

    Follow-up Service Requesting Service First follow the instructions in the troubleshooting section ( p.21 to p.24). If the error is not corrected, contact Noritz America Technical Support at 866-766-7489. We will need to know: The Model ....(check the rating plate) *See p.4 for the location of the label Date of purchase ..

  • Page 26: Specifications

    • Specifications may be changed without prior notice. Specifications • The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water temperature. Specifications Item Specification Model Name N-0751M Type Installation Indoor/ Outdoor, Wall Hanging Air Supply/Exhaust Power Vented Ignition Direct Ignition...

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