TANKLESS GAS WATER HEATER Owner’s Guide Models : NC1991-OD NC1991-DVC FOR USE IN COMMERCIAL 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) [NC1991-OD] Do Not Install Indoors. Prohibited Prohibited This will cause carbon monoxide poisoning and a potential fire hazard. Prohibited 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. Indoor [NC1991-DVC] Do not use the water heater if the concentric pipe is displaced, has holes, is clogged or is corroded. WARNING No flame. A. This water heater does not have a pilot.
Important Safety Information-2 (Continued) WARNING Prohibited Do not place the unit or the flue terminal in an indoor environment by means of adding walls and ceiling (Do not enclose using corrugated sheets, etc.) Prohibited Carbon Monoxide Poisoning Hazard. Do not install this water heater in a mobile home, recreational vehicle or on a boat. Prohibited Do not use combustible chemicals such as oil, gasoline, benzene etc. in the near the heater or the flue terminal.
(Continued) 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. Be sure to do.
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 4500 ft. (1350m) above sea level. 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.
Contents Important Safety Information ....................................................................... 2 Contents......................................................................................................... 7 RC-9018M Operation Overview .................................................................... 8 Initial Operation ............................................................................................ 10 General Parts Main Unit ...............................................
RC-9018M Operation Overview Basic operation It is possible to automatically turn the water heater “ON” or “OFF”. It is possible to lock remote controller operation. [For recirculation systems ( )] It is possible to circulate hot water only during preferred times of day. Automatically turned "ON" Automatically turned "OFF" p.20 p.28 p.
User Preferences The remote controller can be customized based on the preference of the user in the following ways: The set temperature can be restricted to a maximum level to prevent high temperature settings from being selected. Adjusting the Maximum Output Temperature The clock display can be shown even though the power ON/OFF button is set to "OFF". What Ca pown I sa er? ve ow? ti it n me is Power Saving Modes p.23 The brightness of the remote controller can be adjusted for better visibility.
Initial Operation Before the first use of your water heater, make the following preparations. 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. (Ex.
General Parts -1 Main Unit NC1991-OD (Outdoor Wall Mounted, Power Vented Model) Exhaust Vent Front Cover Air Inlet Water Drain Valve (with Water Filter) Pressure Relief Valve (Inside Water Inlet) ( p.36) Gas Supply Valve Water Supply Valve NC1991-DVC (Indoor Wall Mounted, Power Vent/Sealed Model) Concentric Pipe Front Cover Water Drain Valve (with Water Filter) Pressure Relief Valve Gas Supply Valve * The above illustration shows an example of installation.
General Parts -2 Remote Controller (RC-9018M) The remote controller will emit a tone when a button is pressed. Prog Button / Indicator (Red) Activates the automatic water heater power “ON” or “OFF” setting as determined by the user selected schedule. ( p.21) Power ON /OFF Button / Indicator (Green) For turning the water heater on/off. Alarm Off Button / Indicator (Red) Stops the tone that is emitted when an error occurs. ( p.
Screen Display * The screen display shown below is for illustration purposes only. The actual display will vary depending on how the water heater is being used. * After a button is pressed, the display will gradually become darker to prevent unnecessary power consumption by the remote controller. Flame Symbol The flame symbol is displayed during combustion when using hot water or recirculation functions.
System Check If you press the button, you can check the status of the system (Display Screen Example [System [Rcrc] ]) Cover shown in the open position. System Displayed on the Remote Controller System Description Water heater only operation. * Water heater and recirculation operation. * During recirculation operation, hot water is always circulated in the piping to provide instant hot water when a fixture is opened. [If you set the button to "ON", is displayed. (If "synchro ON/OFF" is set to "ON".
Depending on the configuration of your system, not all functions may be used. General System Diagram * The number of water heaters, fixtures, and pumps will vary depending on the configuration of the hot water system. Water heater When you start using the system, cold water in the piping must be discharged before receiving hot water. Water heater Instant hot water is available. Hot water is circulated in the piping.
For All Systems Clock Adjustment Cover shown in the open position. Operation 1 2 3 Press the Screen Display Description * This adjustment can be made regardless of whether the button inside the cover. Press the button is ON/OFF. button. 1) 1) Use the buttons to (Ex: AM10:15) reset the clock. 2) Press the button 2) * The time changes in 1-minute increments with each press of the button, and then in 10-minute increments if the button is kept pressed down.
For All Systems Using the Water Heater * If is displayed, hot water will be discharged at the temperature of the storage tank. Operation 1 Screen Display button is "ON". For systems with recirculation operation, is displayed here. Description * The indicator is lit. * The previously set hot water supply temperature is shown. [For systems with recirculation operation] * If you set the Check 2 Turn on hot water. (Ex.: 110°F) button to "ON", recirculation operation is automatically started.
For All Systems Setting Hot Water Temperature * If is displayed, hot water will be discharged at the temperature of the storage tank. Cover shown in the open position. Operation 1 2 (Ex.: 110°F) Set the temperature using the buttons inside Description * The button is "ON". the cover. 1 Screen Display (Ex.: 105°F) indicator is lit. * The previously set hot water supply temperature is shown.
Temperature Setting Options (°F: When using °F mode: 100 The temperature settings below are examples. The temperature setting necessary depends on the usage, the length of piping and the time of year. ) 105 110 115 120 125 130 135 140 145 150 160 170 185 Washing dishes, etc. Shower, hot water supply, etc. When using °C mode: ( High temperature *Initial factory setting is 110°F temperature settings below are examples.
For All Systems Automatic Water Heater “ON” or “OFF” * If you set the time to turn "ON" or "OFF" the button, the button is automatically turned "ON" or "OFF" at the set time every day by just turning the button "ON". Cover shown in the open position. * It is also possible to set only “ON” or “OFF” operation. * For recirculation systems, circulation is started or stopped according to the button condition, "ON" or "OFF".
Operation Hint for operation Follwing this procedure allows for automated control of water heater operation without user interaction. * The setting time shown on the display of the remote controller is for example purposes only. Ex. 1: Both "ON" and "OFF" functions are automated. AM 10:00 Ex. 2: Only “ON” function is automated. PM 8:00 AM 10:00 your desired time Ex. 3: Only “OFF” function is automated.
For All Systems Locking the Remote Controller By locking the remote controller, the settings cannot be accidentally changed if a button is pressed by mistake. Cover shown in the open position. Operation 1 Press and hold Screen Display button for approximately 2 seconds to lock the remote controller. Description * The operation can be locked regardless if the button is “ON” or “OFF”. * The operations of and , , buttons are locked.
For All Systems Customizable Settings -1 Adjusting the Maximum Output Temperature. Display Screen Power Saving Mode [powersave dsply] The maximum output temperature can be limited to prevent discharging hot water at too high of a temperature. To conserve power consumption by the display, it can be turned off completely or set to only display the clock when the power ON/OFF button is turned “OFF”. 1 2 1 button is "OFF". Press the button inside using the buttons. Press the button.
Customizable Settings -2 For All Systems Adjusting the brightness of the display screen when the remote controller is turned on. The display screen can be brightened or darkened or the backlight can be turned off completely. 1 Press the button inside the cover, Select Muting the remote controller. The remote controller can be muted so that it does not emit a tone when a button is pressed. Error Tone Settings.
Draining the Water Heater. Restoring Default Settings. ( Select settings can be restored to the factory default conditions. See items marked with a in the “Default Settings” section ( p.47). Refer to page 33 for details.) 1 2 button is "OFF". Press the button inside the cover, Select 1 2 button inside the cover, Select buttons. using the buttons. Press the button. Press the button. Select using the buttons, The "Misc settings" screen appears.
Enabling Automatic Recirculation Operation For * To check system status. ( p.14) * When “synchro ON/OFF” is set to “Yes”, recirculation can be activated automatically. * To change “synchro ON/OFF” from “Yes” to “No”, follow the same procedure as described below. Cover shown in the open position. Operation 1 2 3 1) Press the Screen Display button inside the cover, Select "Recirc menu" using the buttons. 2) Press the button.
Manually Starting Recirculation Operation For Recirculation operation can be manually stopped or started using this procedure. Cover shown in the open position. Operation 1 2 1) Press the Screen Display * You can set this function if the button 1) inside the cover, Select "Recirc menu" using the buttons. 2) Press the button. 1 ) Select "Recirc on/off" using the buttons. 2) Press the button. Description button is "ON".
Setting the Recirculation System For Cover shown in the open position. Operation * With the recirculation operation timer set, hot water will be automatically circulated in the hot water pipes. Even with this function activated, it may take several minutes for hot water to be completely circulated through the plumbing system. Set the timer to activate the recirculation system prior to the first use of hot water to ensure hot water is instantly available. * Multiple recirculation time periods can be set.
Operation Timer Operation 4 Screen Display Description 1) Select "AM8:00" using 1) the * Every time when you press the button, the time changes by one hour. Here [To keep the current “End” time] buttons. Press the 2) button to 2) Press the complete the “End” time setting. 1) Select "Add" using 1) the button without changing the "End" time, and proceed to step 5. * You can set multiple operation time periods. buttons. 2) Press the button.
Single Water Heater Only 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.
4 Operation Screen Display Turn on hot water. Lit during combustion Description If the hot water temperature has been set so that it does not require mixing, set the mixing valve to its highest setting. The highest temperature The hot water in the bathtub may become lukewarm if it is mixed with cold water at the fixture. 5 When the bathtub fills with the preset volume of water, Pi Pi ! an alarm will sound alerting you to shut off I will go to off. turn the water.
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 equipment 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 Drainage Using the Remote Controller (1) button is “OFF”. (2) Press the button inside the cover, Select using the Press the buttons. button. The "Misc settings" screen appears.
Preventing Damage from Freezing-2 Turning the Unit Back On 1. Check that all drain plugs are inserted. 2. Check that all hot water fixtures/faucets are closed. 3. Follow the procedure on p.10 “Initial operation”, steps 1 through 4.
Regular Maintenance-1 Periodic Inspection CAUTION Be sure to do. To prevent burns or scalding, turn off the power button and wait until the equipment cools before performing maintenance. Check For dust and soot in Check For laundry, newspaper, the exhaust vent or the flue terminal. timber, oil, spray cans and other combustible materials. near the heater or the flue terminal. Check For abnormal sounds during operation. Check For abnormalities in external appearance, discoloration or flaws.
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.
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.36) 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.
Troubleshooting-2 (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).
Remote Controller The power ON/OFF indicator does not light up. • 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. The clock display shows "- : - -". • If the time is not displayed on the clock, either a power failure has occured or power was disconnected resulting in the display showing "- : - -". ( p.
Troubleshooting-3 Other 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/faucet sufficiently open? • 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.
Checking for Error Conditions When a failure occurs, information relating to the error blinks on the display. The error alarm may also continuously sound. Error Code Display Screen The display may indicate the type of failure that has occured depending on the system configuration. Error Code Cause Action Ignition error Check whether the gas valve is open. Press the power button to turn the unit off, open a hot water fixture/faucet, and turn the unit back on.
Follow-up Service-1 Requesting Service First follow the instructions in the troubleshooting section ( p.37 to p.41). 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.
Press the 1 button to check the status of the system Operation Press the Description Screen Display * Status can be checked regardless of button inside the cover. whether the * If the button is ON/OFF. button is pushed or it is left untouched for approximately 10 minutes, it will return to the previous screen. ● Identifying units that require service (system dependent). Press the * If you press the button twice inside the cover.
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-1 • 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-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.
Default Settings Items Default setting Clock display (unset) Hot water temperature Hot water volume 110˚F / 40˚C Alarm off Customizable Settings ( P23 - 25) Default setting Maximum Output Temperature 185˚F / 85˚C "Powersave dsply" and clock display No-1 Brightness of the display screen when Normal the remote controller is turned on. Operation sound of remote controller Yes Notification when a failure is generated Yes Indicates an item that can be restored to default. See p.
