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Noritz SCU-401-12M, Руководство по установке, Страница: 31 / 39

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System controller

External operation switch Terminal

External operation switch

Connect to terminals

External 

operation

 switch

Pressure 

switch

Remote

controller

●  Connect the external operation switch when you want to turn ON/OFF the water heater from external 

in addition to the Power ON/OFF Button of the remote controller.

-  If the terminal of the external operation switch is switched from open to short, the Power ON/OFF 

Button of the water heater is turned "ON".

-  If the terminal of the external operation switch is switched from short to open, the Power ON/OFF 

Button is turned "OFF".

15VDC, 2.7mA

Thermostat Terminal

Thermostat of 

the hot water storage tank

Connect to terminals

Thermostat

Remote

controller

15VDC, 2.7mA

External 

operation switch

Thermostat

●  Use the normally open relay with the contact for low voltage.

●  For the external operation switch

-  Whether the Power ON/OFF Button is synchronized or not to 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.

  Power ON/OFF Button is synchronized:        Power ON/OFF Button is turned "ON", 

                                                                           cycle operation is turned "ON"

  Power ON/OFF Button is not synchronized:  only Power ON/OFF Button is turned "ON"

●  Connect the thermostat of the hot water storage tank.

-  If the temperature of the hot water storage tank exceeds the temperature set with the thermostat, 

the contact in the thermostat is opened and the circulation pump stops.

-   A platinum resistance temperature detector cannot be connected directly.

●  This terminal is short-circuited when the product is shipped from factory. 

  When you use this feature, disconnect a short-circuit connector as shown below.

●  This terminal is short-circuited when the 

product is shipped from factory. 

  When you use this feature, disconnect a 

short-circuit connector as shown below.

Disconnect this connector 

when external operation switch is connected.

Disconnect this connector 

when thermostat is connected.

─31─

Содержание SCU-401-12M

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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