Noritz NR662-OD Owner's Manual
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Noritz NR662-OD 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.
Low NOx Approved
by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)
SBB8065
Rev. 06/13
Models : NR662-OD
NR501-OD
FOR USE IN RESIDENTIAL APPLICATIONS.
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
*SBB8065*

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  • 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 Approved Noritz America reserves the right to discontinue, or change at any by SCAQMD time, the 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 Upper: If you detect abnormal combustion Min. 36" (900mm) or abnormal odors, or during an Left side: earthquake, tornado or fire: Right side: Min. 6" (150mm) Be sure 1. Turn off the hot water supply Min. 6" (150mm) to do. 2. Turn off the power to the water Front: heater Sug. 24" (600mm) 3. Turn off gas and water supply valve Indicates suggested clearances for maintenance. 4. Call the nearest Noritz agent (Continued)
  • Page 4 Don’t disassemble the water heater or the exhaust vent the unit. terminal. Contact Noritz before using with Prohibited a solar pre-heater. Confirm that the gas and power supply indicated Be sure to do. on the rating plate. Be sure to do. California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, Ex. For Natural Gas (NR662-OD) death, serious illness or other reproductive harm. This product may contain such substances, be their origin from fuel combustion (gas, oil) or components of the product itself. The gas conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. The information in the instructions must be Installation and service must be followed to minimize the risk of fire or performed by a qualified installer, explosion or to prevent property damage, service agency or the gas supplier. Be sure personal injury, or death. The qualified...
  • Page 5 CAUTION Be sure to electrically ground the Do not turn off the water heater unit. while someone is bathing. Prohibited Ground. Keep power cord free of dust. Do not cover the water heater and the exhaust vent terminal, store trash or debris near it, or in any way Prohibited Be sure block the flow of fresh air to the unit. to do. Do not use the water heater for Do not install in locations where other than hot water supply, shower excessive dust or debris will be and bath. in the air. Prohibited Prohibited Do not use a broken or modified power cord. Do not touch the exhaust vent Do not bind, bend or stretch power cords. terminal during or immediately after Do not scratch, modify, or subject them to operation of the water heater. Prohibited impact or force. Don’t touch. To prevent burns or scalding, turn off the power button and wait until the unit cools before performing maintenance. Be sure to do.
  • Page 6 Important Safety Information CAUTION Do not drink water that has been inside the This unit is only approved for installation up unit for an extended period of time. Do not to 4500 ft. (1350m) above sea level. drink the first use of hot water from the unit For installations at higher elevations, contact Noritz in the morning. America for Instructions. Clean the filter on the water inlet as Do not disassemble the remote controller. frequently as required by the quality of your local water. Do not use benzene, oil or fat detergents to clean the remote controller. Keep the area around the unit clean. This may cause deformation. If boxes, weeds, cobwebs, cockroaches etc. are in the vicinity of the unit, damage or fire can result.

  • Page 7: Table Of Contents

    Contents Important Safety Information ............... 2 Contents......................7 Unit Components ..................8 Display Window ..................... 9 Initial Operation .................... 10 How to Use (Not using the remote controller) Using the Water Heater ................11 How to Use (Using the optional remote controller) Remote Controller ..................12 Setting and Using the Water Heater ............13 Adjusting the Maximum Output Temperature ........14 Flow Meter Alarm ..................16 Muting the Remote Controller ..............18 Preventing Damage from Freezing ............. 19 Regular Maintenance ................... 21 Troubleshooting ...................

  • Page 8: Unit Components

    Display Window Displayed during power "ON" or Water Drain Valve combustion. (page 9) (with Water Filter) Two or three digit- (Inside Water Inlet) number is displayed (page 22) when a failure occurs. (page 24) Pressure Relief Valve Water Supply Valve Gas Supply Valve (Ex.NR662-OD) * The above illustration shows an example of installation. The exact installation configuration may be slightly different.

  • Page 9: Display Window

    Display Window The display window allows you to view the status of unit or error codes. (Display Window) (Ex.NR662-OD) When the gas burner is on. When the gas burner is on, set temperature's is displayed for one minute. When unit is initially plugged into power, set temperature's is displayed for approx. three minutes. When hot water flows. (When the gas burner is off, and cold water flows.) After one minute passed from turn on hot water, the outside edge of the three digit display will rotate in a circular pattern.

  • Page 10: Initial Operation

    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. Hot water fixture Open the gas supply valve. Plug into power. Do not touch with wet hands. (Ex.NR662-OD)

  • Page 11: How To Use (Not Using The Remote Controller)

    Indicates the burner is off. The electrical power does not need to be disconnected between uses. If you want to the temperature to be changed to 130°F, 135°F or 140°F, contact the installer or Noritz. DANGER To prevent scalding. Hot Water Heater temperatures over 125°F(52°C) can cause severe burns instantly or death from scalding.

  • Page 12: How To Use (Using The Optional Remote Controller)

    How to Use (Using the optional remote controller) Remote Controller Optional Remote Controller (RC-7651M) If you want to change the temperature of supplied hot water frequently or you want to set the amount of hot water to accumulate the hot water, this remote controller is useful. 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, (pages 13 and 16) the flow meter alarm, and other settings. Priority Indicator When this indicator is lit, the hot water temperature can be set. (page 13) Power On/Off Button Temperature Setting...

  • Page 13: Setting And Using The Water Heater

    How to Use (Using the optional remote controller) Setting and Using the Water Heater Press the Power On/ Off Button. The temperature will be displayed on the remote Previous set temperature control thermostat. (Ex.: 115°F) Set temperature. Check the indicator lights. Always check the temperature setting before use. ) Cold Water temperature When using °F mode: °F : The temperature settings below are examples. The temperature setting necessary depends on the usage, the length of piping and the time of year.

  • Page 14: Adjusting The Maximum Output Temperature

    How to Use (Using the optional remote controller) Adjusting the Maximum Output Temperature Turn off the Power On/Off Button. Press and hold the flow Tone sounds meter alarm set button after 2 sec. until a sound is heard (2 sec.). Change the temperature using the setting buttons. Down The upper limit of the hot-water supply temperature can be changed to (For Fahrenheit (°F)) 115°F, 120°F, 125°F, 130°F, 135°F or 140°F. (For Celsius (°C)) 46°C, 47°C, 48°C, 50°C, 55°C or 60°C.
  • Page 15 DANGER To prevent scalding: High Temperature Hot Water Heater temperatures over 125°F (52°C) can cause severe burns instantly or death from scalding. • Children, disabled and elderly are at the highest risk of being scalded. Feel water temperature before bathing or showering. Remote controller Display Temperature limiting valves are available, ask professional person. • When setting the unit to 125°F / 55°C (131°F) or higher, the temperature display will flash for 10 seconds and emit a tone as a high temperature warning.

  • Page 16: Flow Meter Alarm

    How to Use (Using the optional remote controller) Flow Meter Alarm When the display When the display Preparation Plug the bath drain. setting is in Fahrenheit. setting is in Celsius. (Starting with the power off) Press the Power On/Off Button. The temperature will be displayed on the remote control thermostat.
  • Page 17 Check the temperature An alarm will sound for ten before stepping into seconds when the flow the bath tub. reaches the set level. High Temperature. The water will continue to run unless it is manually turned off. If the flow meter alarm is being used to indicate when a tub is full: •...

  • Page 18: Muting The Remote Controller

    How to Use (Using the optional remote controller) 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/ Muted Sound...

  • Page 19: 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*. <Only using the remote controller>...

  • Page 20: 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 unit cools down before draining the water. The appliance will remain hot after it is turned off.

  • Page 21: Regular Maintenance

    For water leaks from the Check unit and piping. (Ex. NR662-OD) Periodic Maintenance Unit Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to clean any stains. Optional Remote Controller Wipe the surface with a wet cloth.

  • Page 22: Periodic Maintenance

    (Take care not to lose the packing.) 7. Close all hot water fixtures. 8. Open the water supply valve and check that Water Supply water does not leak from the drain plugs or water Valve drain valve (with water filter). (Ex. NR662-OD)
  • Page 23 # = 1, 2, 3, 4, 5, 6, 7, 8, 9, A, b, C, d, E, F Damage to the water heater as a result of below is not covered by the Noritz America Limited Warranty. To ensure full warranty coverage, treat or condition water that exceeds the target levels provided in this table.

  • Page 24: Troubleshooting

    A, b, C, d, E, F by disconnecting electrical power until the Heat Exchanger can be flushed. before long.) Contact Noritz America for more information about flushing the Heat Exchanger. (866-766-7489) The unit detects the Scale The unit is locked because of repeated Scale Build-up error codes.
  • Page 25 The water may be mixed in the hot water plumbing. The hot water is not the correct temperature. The actual outlet water temperature is lower than the set temperature of the unit. Contact the nearest Noritz agent. Temperature Problems What to do Display Window...
  • Page 26 The actual outlet water temperature is lower than the set temperature of the unit. Contact the nearest Noritz agent. The unit will not heat the water if the flow rate is less The water is cold when only than 0.5 gallons (2L) per minute.
  • Page 27 When hot water is demanded at other fixtures, the amount available may be reduced. The maximum flow at a certain fixture is not available from the NR662-OD is 5.3 GPM (20L/min.) constant. at a 45°F (25°C) temperature rise. The maximum flow available from the NR501-OD is 4.5 GPM (17L/min.) at...
  • Page 28 The unit may need adjustments done for installations start up or during operation higher than 2000ft above sea level. Please contact emitting from the unit. your installer or Noritz to verify the unit dip switches are set correctly for your installation. Other Problems...

  • Page 29: Follow-Up Service

    Period of Time for Stocking Repair Parts Noritz will stock repair and maintenance parts for this unit for the time period from the date of the production date as follows: twelve (12) years for the heat exchanger and ten (10) years for remaining parts.

  • Page 30: 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 31: Specifications

    • 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 NR662-OD Type Installation Outdoor Wall Mounted Air Supply/Exhaust Power Vented Ignition...
  • Page 32 Specifications-2 • 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 NR501-OD Type Installation Outdoor Wall Mounted Air Supply/Exhaust Power Vented Ignition Direct Ignition...

This manual is also suitable for:

Nr501-od

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