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Noritz NC1991-DVC, Owner'S Manual

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Noritz NC1991-DVC Owner'S Manual Download Page 15

1

System Displayed on 

the Remote Controller

System Description

General System Diagram

                           *  The number of water heaters, fixtures, and 

                               pumps will vary depending on the configuration of the hot water system.

Applicable Remote 

Controller Functions

Water heater only operation.

Functions other than 

those shown on pages 

26 to 29 can be used.

* 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". (

 

p.26))]

 

All functions 

can be used.

* Water heater combined with a storage tank

   operation.

* If a recirculation system is also installed, 

  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.]

Functions other than 

those shown on pages 

26 to 31 can be used.

Depending on the configuration of your system, not all functions may be used.

When you start using the system, cold 
water in the piping must be discharged 
before receiving hot water.

Water heater

Water heater

Instant hot 

water is 

available.

Hot water is circulated 

in the piping.

Pump

Hot water

storage 

tank

Instant hot 

water is 

available.

Water heater

Pump

Pump

Hot water is circulated  

to the tank.

Summary of Contents for NC1991-DVC

Page 1: ...NG 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 mus...

Page 2: ...us situation which if not avoided may result in property damage CAUTION Be sure to do Ground Electric Shock DANGER Icons warning of risk level Important Safety Information 1 This is the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death Vapors from flammable liquids will explode and cat...

Page 3: ...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 C Use only your hand to turn the gas valve knob Never use tools If the knob will not turn by hand don t try to repair it Call a qualified service technician Force or attempted repair may result in a fire or explosion...

Page 4: ...ot allow small children to bath unsupervised Do not use hair spray or spray detergent in the vicinity of the heater Prohibited Prohibited Prohibited Leave the proper clearance between the water heater and nearby objects trees timber boxes with flammable materials etc Be sure to do Indicates suggested clearances for maintenance Do not place combustibles such as laundry newspapers oils etc near the ...

Page 5: ...f the water heater while someone is bathing Prohibited Do not use a broken or modified power cord Do not bind bend or stretch power cords Do not scratch modify or subject them to impact or force Do not touch the exhaust vent or the flue terminal and concentric pipe during or immediately after operation of the water heater Do not install in locations where excessive dust or debris will be in the ai...

Page 6: ...m 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 Take necessary measures to prevent freezing of water and leakage of gas when leaving the unit unused for long periods of time p 33 Do not use parts other than those specified for this equipment If it is snowing che...

Page 7: ...tic Water Heater ON or OFF Operation 20 Locking the Remote Controller 22 Customizable Settings Misc settings 23 For System Rcrc Enabling Automatic Recirculation Operation 26 Manually Starting Recirculation Operation 27 Setting the Recirculation System Operation Timer 28 Single Water Heater Only Flow Meter Alarm 30 Preventing Damage from Freezing 32 Regular Maintenance 35 Troubleshooting 37 Follow ...

Page 8: ...te controller operation p 22 It is possible to automatically turn the water heater ON or OFF For recirculation systems It is possible to circulate hot water only during preferred times of day p 20 p 28 Automatically turned ON Automatically turned OFF Pi Pi Basic operation The initial setting is set to Powersave dsply No 1 If you use hot water or press a button Powersave dsply is released If you pr...

Page 9: ...ing the water heater freeze prevention p 25 Restoring Default Settings Restoring default remote controller settings The set temperature can be restricted to a maximum level to prevent high temperature settings from being selected p 23 The remote controller can be muted so that it does not emit a tone when a button is pressed Pi Pi Pi User Preferences Adjusting the Maximum Output Temperature Remote...

Page 10: ... preparations Follow steps 1 through 4 1 Open the water supply valve Open a hot water fixture to confirm that water is available and then close the fixture again 3 Open the gas supply valve Hot water fixture 2 Turn on the power CLOSED 4 OPEN Do not touch with wet hands Ex NC1991 OD ...

Page 11: ...ted Power Vented Model Air Inlet Water Supply Valve Gas Supply Valve Pressure Relief Valve Exhaust Vent Front Cover Water Drain Valve with Water Filter Inside Water Inlet p 36 NC1991 DVC Indoor Wall Mounted Power Vent Sealed Model Front Cover Water Supply Valve Gas Supply Valve Water Drain Valve with Water Filter Inside Water Inlet p 36 Pressure Relief Valve Concentric Pipe ...

Page 12: ...he hot water temperature p 18 the flow meter alarm and other settings Remote Controller Part Number Use to change system settings or to return to the home screen If you press the menu button and press the temperature setting buttons is sometimes displayed however do not use this mode as it meant for installation or service personnel only Stops the tone that is emitted when an error occurs p 41 Cov...

Page 13: ... is displayed when the button is ON Normally the hot water temperature and the clock etc are displayed Flame Symbol During normal operation the set temperature is displayed Display for Recirculation Operation Display for High Temperature Temperature Setting Clock Display Error Code For systems that use recirculation operation the symbol is displayed when the power ON OFF button is set to ON It is ...

Page 14: ...tion 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 p 26 Water heater combined with a storage tank operation If a recirculation system is also installed hot water is always circulated in the piping to provide instant hot water when a fixture is ...

Page 15: ... used Functions other than those shown on pages 26 to 31 can be used Depending on the configuration of your system not all functions may be used When you start using the system cold water in the piping must be discharged before receiving hot water Water heater Water heater Instant hot water is available Hot water is circulated in the piping Pump Hot water storage tank Instant hot water is availabl...

Page 16: ... 10 minute increments if the button is kept pressed down If the display is left untouched for approximately 20 seconds without pressing the button the setting will be completed When the button is turned ON the home screen will be restored In the event of a power outage or after disconnecting power to the water heater when power is restored the clock on the display screen will show and the clock wi...

Page 17: ...vere burns instantly or death from scalding For All Systems Using the Water Heater If is displayed hot water will be discharged at the temperature of the storage tank For systems with recirculation operation is displayed here button is ON Turn off the hot water Operation Screen Display Description Children disabled and elderly are at the highest risk of being scalded Feel water temperature before ...

Page 18: ...tton is ON 2 Set the temperature using the buttons inside the cover Ex 110 F Ex 105 F Cover shown in the open position If is displayed hot water will be discharged at the temperature of the storage tank For All Systems Setting Hot Water Temperature Operation Screen Display Description ...

Page 19: ...set Ex 125 F F The temperature settings below are examples The temperature setting necessary depends on the usage the length of piping and the time of year Initial factory setting is 110 F If fixtures incorporate mixing valves set the temperature higher than usual 100 105 110 115 120 125 130 135 140 145 150 160 170 185 Shower hot water supply etc Washing dishes etc C F The temperature settings bel...

Page 20: ...t 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 The time changes in 10 minute increments with each press of the button and then in 1 hour increments if the button is kept pressed down If the previous setting is OK press the button without setting Start time If you do not want to set the Start...

Page 21: ...r desired time your desired time 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 Ex 2 Only ON function is automated Ex 3 Only OFF function is automated Automatically turned ON Automaticall...

Page 22: ... regardless if the button is ON or OFF The operations of and buttons are locked Approximately 3 seconds after locking the remote controller the display will return to the previous screen If you press these buttons Approximately 3 seconds after unlocking the remote controller the display will return to the previous screen To Unlock the Remote Controller Press and hold button for approximately 2 sec...

Page 23: ...tton inside the cover Select using the buttons Press the button The Misc settings screen appears Select using the buttons and then press the button Change the setting using the buttons Display Screen Power Saving Mode powersave dsply Yes the display will turn off and the clock will not be displayed when the power ON OFF button is turned OFF No 1 the display will not turn off and the clock will not...

Page 24: ...can be turned off completely Default setting Normal Change the setting using the buttons Select using the buttons and then press the button Press the button inside the cover Select using the buttons Press the button The Misc settings screen appears Ex Normal Setting completed 3 1 2 Error Tone Settings System dependent option The remote controller can be muted so that it does not emit a tone when a...

Page 25: ...e alternately displayed following steps 2 to 3 the drain function will stop 4 2 3 1 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 button is OFF Press the button inside the cover Select using the buttons Press the button The Misc settings screen appears Select using the buttons and then press...

Page 26: ...screen will be restored 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 Enabling Automatic Recirculation Operation For Select Synchro ON OFF and press the button 1 Press 2 Press the button Cover shown in the open position 1 Press the button inside the cove...

Page 27: ...ing will be completed 1 2 Display when the recirculation is set to OFF 1 Select Recirc on off using the buttons 2 Press the button Display when recirculation is set to ON Cover shown in the open position 2 1 1 Press the button inside the cover Select Recirc menu using the buttons 2 Press the button Operation Screen Display Description Manually Starting Recirculation Operation For You can set this ...

Page 28: ...d normally For Setting the Recirculation System The previous setting is displayed Every time when you press the button the time changes by one hour To keep the current Start time Press the button without changing the Start time and proceed to step 4 To add additional time periods to the current setting or to cancel the previous setting 1 Press the button without setting Start time 2 Press the butt...

Page 29: ... Carry out steps 1 to 2 2 Select Cancelled using the buttons 3 Press the button To Cancel the Recirculation System Operation Timer The timer will not activate without pressing the button If the time is not set the time setting screen is displayed p 16 Until the timer is deactivated the recirculation system will operate daily at the set Start and End times All settings are cleared 3 Adjust the time...

Page 30: ...memory The screen returns to the home screen button is ON 1 Press the button inside the cover Select Flow meter using the buttons 2 Press the button If the display is left untouched for approximately 20 seconds without pressing the button the setting will be completed and the home screen will be restored Preparation Fill Volume Options Default setting Alarm off Operation Screen Display Description...

Page 31: ...l temperature at the fixture depending on conditions such as season or length of piping Turn off the hot water when the alarm sounds to prevent overfilling If the hot water temperature has been set so that it does not require mixing set the mixing valve to its highest setting The hot water in the bathtub may become lukewarm if it is mixed with cold water at the fixture Operation Screen Display Des...

Page 32: ... not advisable to run water through the unit when it is OFF p 6 but in this case freeze prevention is more important Remember to set mixing valves and fixtures to their original levels before using the unit again to prevent scalding If there is still a risk that the unit will freeze drain the unit as shown on the next page Preventing Damage from Freezing 1 Freezing is prevented within the device a...

Page 33: ...es and close If multiple units are being used drain two minutes for each unit An 11 Error Code may appear on the remote controller This is not a malfunction of the unit Do not turn Power ON OFF Button OFF Manual Draining Close the water supply valve and disconnect the electrical power supplied to the unit 3 4 5When the water is completely drained replace all drain plugs and close the hot water fix...

Page 34: ...g 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 ...

Page 35: ...with a wet cloth Be sure to do To prevent burns or scalding turn off the power button and wait until the equipment cools before performing maintenance CAUTION Check For laundry newspaper timber oil spray cans and other combustible materials near the heater or the flue terminal For abnormal sounds during operation For abnormalities in external appearance discoloration or flaws For water leaks from ...

Page 36: ...illustration to right 5 Clean the water drain valve with water filter with a brush under running water 6 Replace the water drain valve with water filter and close the drain plugs Take care not to lose the packing 7 Close all hot water fixtures 8 Open the water supply valve and check that water does not leak from the drain plugs or water drain valve with water filter Isolation valves may be purchas...

Page 37: ...n the temperature set on the remote controller If only a small amount of hot water is demanded it is possible for the temperature to be higher than the temperature set on the remote controller The water is too hot Have you allowed enough time for the cold water in the pipes to drain out Water takes time to become hot when turning the hot water fixture faucet No water is available when a fixture is...

Page 38: ...used for other fixtures while filling the bath tub the tub will not fill as much If there is water in the tub already or when filling is stopped and restarted the tub will fill more The flow meter alarm does not sound even when filled to the set amount The flow meter alarm is set to sound when hot water is continuously discharged for the set volume of water If mixing valves are used or if cold wat...

Page 39: ... the set volume of water If hot water is used for other fixtures while filling the bath tub the alarm will sound before the tub is full If mixing valves are used or if cold water is mixed with hot water at the fixture the tub will fill more than the setting of the flow meter alarm The setting cannot be changed when a button is pressed The remote controller is locked While the remote controller is ...

Page 40: ...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 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...

Page 41: ...et and turn the unit back on If the flashing number doesn t return the problem is solved Have a professional check the gas supply pressure Contact the nearest Noritz agent Abnormal combustion low gas supply pressure When a failure occurs information relating to the error blinks on the display The error alarm may also continuously sound Checking for Error Conditions The display may indicate the typ...

Page 42: ...ation of the label Date of purchase see the warranty Details of problem flashing error codes etc in much detail as possible Your name address and telephone number Desired date of visit 1 2 Model code Product name of water heater is displayed Ex Error code Screen display Example Operation Screen Display Description If an error code is displayed the model name and code can be checked If more than on...

Page 43: ...parts Reinstallation If you want to reinstall the appliance at a different location confirm that the gas and power supply indicated on the rating plate are available at the new location If you are not sure consult the local utility company 1Press the button inside the cover Screen display Example Screen display Example Identifying units that require service system dependent Operation Screen Displa...

Page 44: ...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 followed to minimize the risk of fire or explosion or to prevent property damage personal injury or death The qualified service agency is responsible for the proper installation of this kit The installation is not prope...

Page 45: ... In 5 C intervals 20 Options Specification NC1991 OD Outdoor Wall Mounted Direct Ignition 15 150 psi 0 5 GPM 2 L min 23 6 600mm x 13 8 350mm x 9 4 240mm 54 lbs 0 2 Gallon 1 0L 3 4 3 4 3 4 120 VAC 60Hz Zincified Steel Plate Polyester Coating Stainless Steel Copper Sheeting Copper Tubing Flame Rod Thermal Fuse Lightning Protection Device ZNR Overheat Prevention Device Freezing Prevention Device Fan ...

Page 46: ... In 5 C intervals 20 Options Specification NC1991 DVC Indoor Wall Mounted Direct Ignition 15 150 psi 0 5 GPM 2 L min 23 6 600mm x 13 8 350mm x 11 1 280mm 58 lbs 0 2 Gallon 1 0L 3 4 3 4 3 4 120 VAC 60Hz Zincified Steel Plate Polyester Coating Stainless Steel Copper Sheeting Copper Tubing Flame Rod Thermal Fuse Lightning Protection Device ZNR Overheat Prevention Device Freezing Prevention Device Fan...

Page 47: ...tness of the display screen when the remote controller is turned on Normal Operation sound of remote controller Yes Notification when a failure is generated Yes Items Default setting Clock display unset Hot water temperature 110 F 40 C Hot water volume alarm off Indicates an item that can be restored to default See p 25 Restoring Default Settings ...

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