CONDENSING TANKLESS GAS WATER HEATER Owner’s Guide Model : NERC98DV (GQ-C2857WS-FF ET US) FOR USE IN RESIDENTIAL OR MANUFACTURED HOME 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.
(Continued) Prohibited Prohibited Do not use the water heater if the intake/exhaust pipe is displaced, has holes, is clogged or is corroded. Be sure to do. Blocking the opening may result in incomplete combustion. Do not allow anyone to change the water temperature while hot water is being used. To prevent scalding, do not change the water temperature to a higher setting.
Important Safety Information-2 (Continued) WARNING Prohibited 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 Exhaust vent terminal Carbon monoxide poisoning or fire may occur as a result. Prohibited Do not use combustible chemicals such as oil, gasoline, benzene etc. in the near the heater or the exhaust vent terminal.
(Continued) Prohibited Do not allow small children to play unsupervised in the bathroom. Do not allow small children to bath unsupervised. Do not touch the power cord with wet hands. Don’t touch with a wet hand. Be sure to do. Don’t disassemble the equipment. Electric Shock. Consult the nearest Noritz agent if the water heater location needs to be changed. Contact a qualified service technician for any necessary repairs, service or maintenance. Contact Noritz before using with a solar pre-heater.
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. For installations at higher elevations, contact Noritz America for Instructions. Clean the filter on the water inlet as frequently as required by the quality of your local water. Do not disassemble the remote controller. Keep the area around the unit clean. This may cause deformation.
Contents Important Safety Information........................................................................ 2 Contents......................................................................................................... 7 Overview of Condensing Tankless Gas Water Heater ............................... 8 General Parts Main Unit..................................................................................................... 9 Remote Controller.........................................................
Overview of Condensing Tankless Gas Water Heater This water heater is a high efficiency, fully condensing appliance. Unlike a traditional tankless water heater, a condensing type captures heat from the exhaust gas and uses it to preheat the incoming cold water as it passes through the secondary heat exchanger as illustrated below.
General Parts -1 Main Unit [NERC98DV (GQ-C2857WS-FF ET US)] Indoor Wall Mounted, Power Vent/Sealed Model Intake Pipe Flue Collar Front Cover Water Drain Valve (with Water Filter) (Inside Water Inlet) ( p.22) Pressure Relief Valve Water Supply Valve Gas Supply Valve Drain Pipe Discharges the condensate. * The above illustration shows an example of installation. The exact installation configuration may be slightly different.
General Parts -2 Remote Controller (RC-7651M) What is actually displayed depends on how the water heater is set. Burner On Indicator Setting Buttons When burning, the indicator is lit. ( p.13 and 15) For setting the hot water temperature, the flow meter alarm, and other settings. Priority Indicator When this indicator is lit, the hot water temperature can be set. ( p.12) Temperature Setting (Ex.:115°F) Flow Meter Setting The display will flash after hitting the flow meter alarm set button. ( p.
Initial Operation Before the first use of your water heater, do the following: Follow steps 1 through 4. 1 CLOSED 2 Open a hot water fixture to confirm that water is available, and then close the fixture again. Open the water supply valve. OPEN Hot water fixture 3 4 Open the gas supply valve. Turn on the power. Do not touch with wet hands.
How to Use Setting and Using the Water Heater 2 1 (Starting with the Power Off) 1 Press the Power On/Off Button. On The temperature will be displayed on the remote control thermostat. On Previous set temperature (Ex.: 120°F) 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.
2( Set temperature. Always check the temperature setting before use. ) 3 4 Turn on hot water. Turn off the hot water. Hot Cold Check the indicator lights. On Off Water temperature ( When using °F mode: temperature settings below are examples. The temperature setting °F: The necessary depends on the usage, the length of piping and the time of year. ) The maximum output temperature can be set using the remote controller. (page 17) 115 120 Shower, hot water supply, etc.
How to Use Flow Meter Alarm 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. • If there was water in the tub before the fill began, or if the water is not shut off manually when the alarm sounds, the tub may overflow. • If there was water in the tub before the fill began, the temperature in the tub after it is full may be different from the temperature setting.
Water Temperature temperatures settings below are only examples. The °F : The temperature setting necessary will depend on the usage, An alarm will sound for ten seconds when the flow reaches the set level. ( the length of piping and the time of year. 115 (°C (°F) : 120 Hot The temperatures settings below are only examples. The temperature setting necessary will depend on the usage, the length of piping and the time of year. 46 (115) The water will continue to run unless it is manually turned off.
How to Use Muting the Remote Controller 1 1 * Initial factory setting is with sound Hold the Power On/Off Button for five seconds. Muted No sound after 5 sec. 16 The remote controller will emit a sound when any button is pushed. This sound can be muted if it is desired. Sound 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 Adjusting the Maximum Output Temperature 3 1 2 1 Turn off the power. Off 2 Press and hold the flow meter alarm set button until a sound is heard (2 sec.). 3 Tone sounds after 2 sec. Change the temperature using the setting buttons. Up 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.
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.
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 High Temperature To avoid burns, wait until the equipment cools down before draining the water. The appliance will remain hot after it is turned off. To prevent damage from freezing, the water heater must be plugged into power at all times. If power is unplugged, drain the water completely from the water heater.
Preventing Damage from Freezing-3 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 p.11 “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 Be sure to do. [When supplying combustion air from the indoors] Check For smear or blockage with dust, oil, etc. at the air supply vent. If blocked, remove the build-up with a vacuum cleaner or damp towel. * Do not permanently remove the Inlet Screen. To prevent burns or scalding, turn off the power button and wait until the equipment cools before performing 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. The appliance will remain hot after it is turned off. 1. Close the water supply valve. 2. Open all hot water fixtures. 3.
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 "* will be heater will detect the Scale Build-up in the Heat Exchanger and then the error code " displayed on the Remote Controller. When the error code " "* is flashing on the Remote Controller, the Heat Exchanger needs to be flushed to prevent damage from Scale Build-up.
Troubleshooting-1 Initial Operation Unit does not attempt to ignite when water is running. • Check for reversed plumbing or crossed pipes. • Check the water drain valve filter. ( p.22) Unit attempts to ignite but fails • Reset unit and try again. There may be air in the gas line. • Have a professional check the gas supply pressure. Temperature Hot water is not available when a fixture is opened.
(Continued) The water is cold when only a single fixture is open. • The unit will not heat the water if the flow rate is less than 0.5 gallons (2L) per minute. Open the fixture more or open other fixtures so that a greater flow passes through the unit, and the unit should begin heating again. Fluctuations in hot water temperatures. • Set water temperature at 115°F to 120°F or 48°C (118°F) to 50°C (122°F).
Troubleshooting-2 Remote Controller The light on the power button does not come on. • Has there been a power failure? The water temperature changes after a power failure or when the power is disconnected. • The temperature setting and the flow meter alarm setting may both need to be reset after a power outage. • Is the power connected properly? The plastic on the surface or buttons • The surface of the remote controller is affixed with a protective sheet (to prevent surface scratching, etc.
(Continued) The water appears blue The bath tub/wash-basin has turned blue • Coloration to a blue color may be noticed from small traces of copper ion contained in the water and fat (furring). However, there are not problems concerning health. Coloration of the bath tub/wash-basin can be prevented by cleaning frequently. Frequent water discharge from the drain pipe. • Condensation forms inside the unit during operation and is discharged from the drain pipe.
Troubleshooting-3 Check for an Error Code on the Remote Controller åÃè·ï\é¶ÇÇ®í≤Ç◊Ç≠ÇæÇ≥Ç¢ åÃè·ï\é¶ÇÇ®í≤Ç◊Ç≠ÇæÇ≥Ç¢ If there is a problem with the unit, a numerical error code will flash on the remote controller. If this occurs, take appropriate measures as listed below. Flashing When an error code appears, the display and the operation light will flash together. Remote Controller Error Code =1-4, F # =0-9 # =0-9 Cause Action Ignition error Check whether the gas valve is open.
Follow-up Service-1 Requesting Service First follow the instructions in the troubleshooting section ( p.24 to p.28). 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.......(see the warranty) Details of problem.....(flashing error codes, etc.
Follow-up Service-2 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.
Noritz America Corporation LIMITED WARRANTY - TANKLESS WATER HEATERS 1. What is Covered by this Warranty During the applicable Warranty Period (specified below), Noritz America Corporation (“Noritz“) warrants to the original purchaser (“Buyer”) that the new Noritz gas water heater in the originally installed location (“Product”) is free from material defects in material or workmanship (the “Warranty”).
