CONDENSING TANKLESS GAS WATER HEATER Owner’s Guide Model : NRC663-FSV (EZTR40) FOR USE IN RESIDENTIAL APPLICATIONS. WARNING If the information in this manual 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.
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. Closely observe these warnings; they are critical to your safety. Icons warning of risk level This is the safety alert symbol.
Prohibited Prohibited Do not use the water heater if the exhaust pipe is displaced, has holes, is clogged or is corroded. Be sure to do. Do not allow anyone to change the water temperature while hot water is being used. Be sure to do. To prevent scalding, do not change the water temperature to a higher setting. Check whether or not the air inlet filter is clogged with dust, trash or the like. Clogging the opening may result in incomplete combustion.
Important Safety Information-2 (Continued) WARNING Do not place the exhaust vent terminal in an indoor environment by means of adding walls and ceiling (Do not enclose using corrugated sheets, etc.) Prohibited Carbon monoxide poisoning or fire may occur as a result. Be sure to do. Confirm that the gas and power supply indicated on the rating plate. Ex. For Natural Gas Do not place outdoors Rain may enter the unit or the burner fire may be blown by the wind, causing malfunction or fire as a result.
(Continued) Don’t disassemble the unit. Contact a qualified service technician for any necessary repairs, service or maintenance. Contact Noritz before using with a solar pre-heater. Be sure to do. California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, 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.
Important Safety Information-3 CAUTION Do not drink water that has been inside the unit for an extended period of time. Do not drink the first use of hot water from the unit in the morning. This unit is only approved for installation up to 3,500 ft. (1,050m) above sea level. Clean the filter on the water inlet as 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.
Contents Important Safety Information........................................................................ 2 Contents......................................................................................................... 7 Unit Components........................................................................................... 8 Display Window.............................................................................................. 9 Initial Operation...............................................
Unit Components Unit Indoor Wall Mounted, Power Vented Model The condensing tankless gas water heater tends to show white steam. Flue Collar Pressure Relief Valve After the exhaust gas passes through the secondary heat exchanger, it becomes low in temperature and moisture rich which tends to produce steam at the vent discharge terminal. This is a normal occurrence.
Display Window The display window allows you to view the status of unit or error codes. (Display Window) When the gas burner is on. 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.
Initial Operation Before the first use of your water heater, make the following preparations. Please check the following when you use the water heater for the first time after the installation. Usually, the hot water is supplied by opening the hot water if gas, water, and electric power are supplied (if there is a remote controller, it should be turned ON). Follow steps 1 2 1 through 4. Open the water supply valve.
How to Use (Not using the remote controller) Using the Water Heater The factory temperature setting is 120°F. Mix with cold water with a mixing valve or at the fixture for desired temperature. (Display Window) Set temperature is displayed. * When unit is initially plugged into power. Check that electrical power is connected. * How to check the set temperature. If the power supply is set to "OFF", (Display Window) and then set to "ON", the temperature of supplied hot water is displayed.
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 indicator is lit.
How to Use (Using the optional remote controller) Setting and Using the Water Heater Press the Power On/ Off Button. On On The temperature will be displayed on the remote control thermostat. Set temperature. Previous set temperature (Ex.: 115°F) Check the indicator lights. (Always check the temperature setting before use. ) Hot Cold Water temperature ( When using °F mode: temperature settings below are examples.
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. Temperature limiting valves are available, ask professional person.
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/ Off Button for five seconds. Sound Muted No sound after 5 sec. Tone sounds after 5 sec. • The flow meter alarm cannot be muted. • The high temperature warning tone when setting the unit to 125°F / 55°C (131°F) or higher will not emit a sound when muted.
How to Use (Using the optional remote controller) Flow Meter Alarm Preparation Plug the bath drain. (Starting with the power off) Press the Power On/Off Button. On The temperature will be displayed on the remote control thermostat. Set temperature. When the display setting is in Fahrenheit. On When the display setting is in Celsius. On Previous set temperature (example:115°F) Previous set temperature (example:46°C) Check the indicator lights. Check the indicator lights.
An alarm will sound for ten seconds when the flow reaches the set level. High Temperature. Check the temperature before stepping into the bath tub. 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: • If any hot water is being used besides what is going into the tub, the alarm will sound before the tub is full.
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. Do not remove the power plug from the wall outlet.
If the water heater will not be used for a long period of time, drain the water. Drain the water as follows: CAUTION High Temperature To avoid burns, wait until the unit cools down before draining the water. The appliance will remain hot after it is turned off. Drain water into a bucket to prevent water damage. 1. Close the gas valve. 2. Fully open one of the hot water fixtures. Fixture Turn off the power button. 3.
Preventing Damage from Freezing-2 Turning the Unit Back On 1. 2. 3. 4. Check that all drain plugs are inserted. Check that all hot water fixtures are closed. Follow the procedure on page 10 “Initial operation”, steps 1 through 4. Make sure that the area around the appliance is well ventilated; open a window or a door if necessary. Then, operate the unit and verify that condensate is coming out of the drain pipe.
Regular Maintenance-1 Periodic Inspection CAUTION - To prevent burns or scalding, turn off the power button or power supply and wait until the unit cools before performing maintenance. Be sure to do. - Do not remove the air inlet filter. If it is removed or damaged, please contact Noritz America. Damage caused by operating the water heater without the air inlet filter is not covered under warranty. Check For proper operation of pressure relief valve.
Regular Maintenance-2 Periodic Maintenance Unit Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to clean any stains. If an external condensate neutralizer is installed, periodic replacement of the neutralizing agent will be required. Refer to the instructions supplied with the neutralizer for suggested replacement intervals. Optional Remote Controller Wipe the surface with a wet cloth.
Water Quality and Maintenance For people who live in a hard water area, periodical flushing is necessary. If the Heat Exchanger is not flushed, the Scale Build-up may cause damage to the Heat Exchanger. In this case, this water heater will detect the Scale Build-up in the Heat Exchanger and then the error code " "* will be displayed in the Display Window. When the error code " "* is flashing in the Display Window, the Heat Exchanger needs to be flushed to prevent damage from Scale Build-up.
Troubleshooting-1 Check for an Error Code on the Display Window or Optional Remote Controller If there is a problem with the unit, a numerical error code will flash on the display window or optional remote controller. If this occurs, take appropriate measures as listed below. When an error code appears, the display and the operation light will flash together.
Initial Operation Problems What to do Display Window Unit does not attempt to Check for reversed plumbing. ignite when water is running. Check the water drain valve filter. (page 22) Reset unit and try again. There may be air in the gas line. Unit attempts to ignite but fails. Have a professional check the gas supply pressure. 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.
Troubleshooting-2 Problems What to do The hot water at the fixture is too hot. Are the gas and water supply valves fully open? [Using the optional remote controller] Is the water temperature setting appropriate? (page 13) Display Window [Using the optional remote controller] If the water supply temperature is high, it is possible for the outlet temperature to be higher than the temperature set on the remote controller. The hot water at the fixture is not hot enough.
Amount of Hot Water Problems What to do The amount of hot water at a certain fixture is not constant. When hot water is demanded at other fixtures, the amount available may be reduced. The maximum flow available is 4.9 GPM (18.7L/min.) at a 45°F (25°C) temperature rise. Display Window Pressure fluctuations and other plumbing conditions can cause the temperature and pressure at a fixture to be unstable, but it should stabilize after a short time.
Troubleshooting-3 Optional Remote Controller Problems What to do The light on the power button does not come on. Has there been a power failure? Is the power connected properly? Display Window The water temperature changes The temperature setting and the flow meter alarm after a power failure or when setting may both need to be reset after a power the power is disconnected. outage. The plastic on the surface or buttons of the remote controller has torn, peeled, or air bubbles inside.
Other Problems What to do The Heater stops burning during operation. Are the gas and water supply valves fully open? Is the water supply cut off? Is the hot water fixture sufficiently open? Display Window Is the gas being cut off by the gas meter? (Can other gas devices such as stoves be used?) (For LP) Is there enough gas in the tank? (Can other gas devices such as stoves be used?) White smoke comes out of the exhaust vent on a cold day. This is normal. The white smoke is actually steam.
Follow-up Service Requesting Service First follow the instructions in the troubleshooting section (page 24 to page 29). If the error is not corrected, contact Noritz America Technical Support at 866-766-7489 or http://support.noritz.com/. We will need to know: The Model . ................(check the rating plate) *See page 4 for the location of the label Date of purchase.......(see the warranty) Details of problem.....(flashing error codes, etc.
Gas Conversion If you move to a region that uses a different type of gas or if the local gas supply is converted, replacement of the gas manifold and adjustment of the appliance will be necessary. 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.
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 Specification Item Model Name Type NRC663-FSV Indoor Wall Mounted Power Vented Direct Ignition 15-150 psi 0.5 GPM (2 L/min.) 27.2" (690mm) x 18.3" (464mm) x 9.