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Noritz SCU-401-12M, Installation Manual, Page: 37 / 39

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Noritz SCU-401-12M Installation Manual Download Page 37

<inch (mm)>

13.2" (336mm)

13.8" (350mm)
13.1" (334mm)

0.4" (10mm)

0.4" (10mm)

7.9" (200mm)

6.7" (170mm)

2.8" (70mm)

1.4" (36mm)

3.9" (100mm)

3.9" (100mm)

22.3" (566mm)

23.6" (665mm)

23.6" (600mm)

5.5" (140mm)

5.5" (140mm)

2.8" (70mm)

1.4" (36mm)

6.7" (170mm)

6-Ø0.2"x0.4" (6x10mm) OBLONG HOLE

4-Ø0.5" (13mm)

4-Ø0.5" (13mm)

6-Ø0.2"x0.4" (6x10mm) OBLONG HOLE

WIRING THROUGHWAY

WIRING THROUGHWAYS

(AC120V)

 18. Dimensions

If at any time during the installation and setup of this product you have questions or concerns, contact Noritz America at 866-

766-7489 or visit http://support.noritz.com/.

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Summary of Contents for SCU-401-12M

Page 1: ...his product safely read this installation manual carefully and follow the installation instructions WARNING Contents 1 Included Accessories 2 2 Optional Accessories 2 3 Introduction 3 4 Installing the...

Page 2: ...ontroller When two or more multi unit systems are installed in parallel One remote controller is necessary for each multi unit system i e 3 multi unit systems will require 3 system controllers and 3 r...

Page 3: ...itial hot water demand Unit Rotation The SCU 401 system controller rotates operation of the primary firing heater every 8 hours of combustion time This helps to ensure even usage of all units Water he...

Page 4: ...nds take caution to not inflict injury We recommend using gloves Be careful not to hit electrical wiring gas or water piping while drilling holes Item CAUTION Illustration Mounting Bracket upper Ancho...

Page 5: ...autions to prevent electrostatic discharges from personnel or hand tools during the system controller installation and servicing to protect the product s electronic control CAUTION For instructions on...

Page 6: ...aters 01 02 03 04 05 06 Water Heater Terminals Inside System Controller Terminal block for remote controller cord The terminal block is depending on each water heater Refer to the water heater s insta...

Page 7: ...Controller sheet stuck into the system Controller Unit 1 Unit 2 Unit 3 Main Controller Power PCB Sub Controller 1 Sub Controller 2 Sub Controller 3 Sub Controller 4 Disconnect this Connector Disconne...

Page 8: ...If you press the menu button and press the temperature setting buttons is sometimes displayed However do not use this mode as it is meant for installation or service personnel only Stops the tone tha...

Page 9: ...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 F...

Page 10: ...a system type 2 Use the buttons to navigate to the correct system type Standard Recirc or Tank Recirc 3 Press the button to select your system type 1 If you chose the Recirc or Tank Recirc systems yo...

Page 11: ...3 In the initial settings menu select System type The menu will have three options Standard Recirc and Tank Recirc 1 Use the buttons to navigate to the appropriate system 2 Press the button to select...

Page 12: ...the button to select the system setting you would like to alter 1 Use the buttons to turn the feature on yes or off no 2 Press the button to select yes or no 3 The display will say Set complete once...

Page 13: ...button 1 Use the buttons to select the unit F gal or C L 2 Press the button to set the units to be displayed 3 The display will say Set complete once an option is chosen You may use the button to retu...

Page 14: ...ng 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 additiona...

Page 15: ...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 Until the timer is deactivated the...

Page 16: ...hot water when a fixture is opened If you set the button to ON is displayed Water heater combined with a storage tank operation If a recirculation system is also installed hot water is always circula...

Page 17: ...displayed first you must press the Buttons several times until item 14 is displayed 4 Flow rate screen is displayed The unit of flow rate on the screen can be changed refer to page 13 Example of disp...

Page 18: ...start blink Use the Buttons on the remote controller to change OFF ON 6 Change 1A from OFF to ON Do not adjust any other items 7 When the items has been set correctly press the ENTER Button Data stat...

Page 19: ...clock setting 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 If the display is left untouched for approximate...

Page 20: ...ardless 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 thes...

Page 21: ...or turning the heater on and off FLOW METER ALARM SET Button This button can be used for water heater s setting even though FLOW METER ALARM SET is displayed on the button If press this button the dis...

Page 22: ...s the Power ON OFF Button you can t change the initial setting If fail to this procedure or 99 code does not blink on the display disconnect electrical power for all water heaters and system controlle...

Page 23: ...e System Settings Setting Procedure Use this procedure if you need to change the system settings after running the Initial Setting Procedure page 22 1 Turn the water heater off by pressing the Power O...

Page 24: ...check for flow when system controller pump terminals are energized If no flow is present it will display 63 error code 3 Pump rotation Not Available Available Available System will rotate pump 1 and 2...

Page 25: ...g buttons Press and hold the FLOW METERALARM SET Button until a sound is heard 2 sec Up Down The upper limit of the hot water supply temperature can be changed to For Fahrenheit F 100 150 F In 5 F int...

Page 26: ...on by pressing the Power ON OFF Button on the remote controller 8 Wait 15 seconds or more 9 Turn OFF the power supply disconnect electrical power to all heaters then turn ON the power supply reconnect...

Page 27: ...ing number via sensing item e g Thermistor Flow sensor FMAS This means FLOW METER ALARM SET Button 5 In order to check the flow rate for each water heater set the desired Unit No by pressing the FLOW...

Page 28: ...2 circulation pumps The system controller carries out the alternate operation of pump 1 and pump 2 at regular time intervals by connecting two circulation pumps When you connect two circulation pumps...

Page 29: ...to control an exhaust fan or damper in this way Use a relay electromagnetic contactor to provide power to the fan or damper Use an additional thermal relay if necessary Use the electromagnetic contact...

Page 30: ...ached as a safety device when an external exhaust fan that is attached to the exhaust fan terminal above does not operate If the status that a contact of the relay is opened continues the system stops...

Page 31: ...the cycle operation can be changed by switching the setting it can be changed only for recirculation system If the external switch is switched from open to short the setting is switched as shown below...

Page 32: ...prevent heat loss through the piping Unit 1 Unit 2 Unit 3 Unit 10 Unit 11 Unit 12 System Controller Remote Controller 1 1 2 5 Cold water supply pipe Size the cold water supply piping to allow for maxi...

Page 33: ...S Example of Recirculation with a Multi unit System Recirculation system This system will make hot water more quickly available to remote fixtures The pump will circulate water through the loop until...

Page 34: ...Size for max flow Storage tank supply line copper or stainless steel pipe Storage tank return line copper or stainless steel pipe Remote Controller Cord If Pump error check is active Refer to page 12...

Page 35: ...loss through the piping Use a union coupling or flexible pipe for connecting the units to ease service and maintenance Refer to the system diagrams for supply and hot water pipe sizing Do not install...

Page 36: ...e Limited Warranty provided with the water heater for complete details Refer to the Troubleshooting section in the Owner s Guide supplied with the water heater If the problem is not corrected contact...

Page 37: ...140mm 5 5 140mm 2 8 70mm 1 4 36mm 6 7 170mm 6 0 2 x0 4 6x10mm OBLONG HOLE 4 0 5 13mm 4 0 5 13mm 6 0 2 x0 4 6x10mm OBLONG HOLE WIRING THROUGHWAY WIRING THROUGHWAYS AC120V 18 Dimensions If at any time d...

Page 38: ...7649M follow instructions on pages 22 26 Then proceed directly to step 8 6 Wait for approximately 30 seconds and then set the clock of the Remote Controller Refer to page 19 for setting the clock If t...

Page 39: ...er SCU 401 Refer to the Procedure for replacing Main Controller in the System Controller for Main Controller SCU 401 Before replacing the System Controller be sure to read this sheet and System Contro...

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