Noritz America SC-401-6M Installation Manual

*SBB80UW*

System Controller

Installation Manual

SC-401-6M

Potential dangers from accidents during installation and use are divided into the following two categories. Closely
observe these warnings, they are critical to your safety.

WARNING

CAUTION

WARNING indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury.

Requests to Installers

WARNING

•

Failures and damage caused by erroneous work or work not as instructed in this manual are not covered by the warranty.

• Refer to installation manual attached to the appliance as well.

• Check that installation was done in accordance with this Installation Manual upon completion.

• After completion of installation, be sure to hand this Installation Manual to the customer.

• When you fasten the screws on the terminals (Warning lamp terminal and so on),do not use electric drivers,
impact drivers and so forth.Tightening with excessive force may cause the terminals to be damaged and lead
to failures.

In order to use this product safely, read this installation manual carefully and follow
the installation instructions.

Contents

1. Included Accessories ................................................. 2

2. Optional Accessories ................................................. 2

3. Introduction ................................................................ 3

4. Installing the System Controller ................................. 4

5. Wiring Diagram .......................................................... 6

6. Remote Controller ...................................................... 7

7. Remote initial setup ................................................... 9

8. Recirculation Pump Timer Setup ............................. 13

9.

System Check Button

10. Maintenance Monitors and Additional Settings

11. Additional Remote features

12. Additional System Controller Features

13. System design, Gas, and Water piping

14. Follow-up Service

.................................................. 15

.........

..........................................

.......................

......................

..........................................................

16
18
20
24
28

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/.

SBB80UW
Rev. 04/17

─1─

1. Included Accessories

Part Shape Qty Part Shape Qty

Tapping Screw

(4 x 8)

*1 : Use the included vinyl tie to bind any excess length of wire

2. Optional Accessories

Name Usage Qty

Remote controller

RC-9018M

Remote controller Cord

RC-CORD10
RC-CORD26

NWC-ADAPTER

(NAW-1 US)

* Always necessary. 1

-The communication cord between the system controller and the
remote controller can be lengthened up to a maximum total length
of 450 feet.

-The communication cord between the system controller and each
water heater can be lengthened up to a maximum total length of 45
feet.

For remote monitoring the multi-unit system through the Mobile App. 1

Check for any missing items

before starting installation.

*1

3

Vinyl Tie

Total number of units
in system - 1

3

CAUTION : Be sure to use the remote controller cord as listed above. If a different cord is used, the equipment may fail or not operate

properly.

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 remote controllers). Each system will have separately wired remote controller cords.

For the combined use pattern

A. When there is no circulation pipe (standard type)

Number of units System controller Remote controller

1 to 6 SC-401-6M RC-9018M

B. When there is a circulation pipe

Condition Number

Recirculation type

(circulation heat-retention with external pump)

Storage Tank Recirculation type

(circulation heat-retention with external pump)

of units

1 to 6 SC-401-6M RC-9018M

1 to 6 SC-401-6M RC-9018M

System controller Remote controller

─2─

3. Introduction (see list of points below)

<Recirc>

<Tank recirc>

Introduction to the “SC-401-6M” System Controller

Overview

This manual is intended to provide instruction for the installation, operation, and features of the SC-401-6M system
controller. It is divided into 4 main sections:

1. Installation of the SC-401-6M system controller

2. Initial programming of the RC-9018M remote controller

3. Additional features of the RC-9018M remote controller and the SC-401-6M
system controller

4. Plumbing diagrams and general information about water and gas piping

Read this manual carefully and follow the instructions as written. If you have any questions, contact Noritz America
at 866-766-7489 or visit http://support.noritz.com/.

Basic Operation

The SC-401-6M system controller is used to combine 1 to 6 Noritz heaters into a single “multi-unit system” The system
controller stages units on and off based on hot water demand and rotates their operation to ensure even usage. It also
has two additional modes which optimize the system for operation with a recirculation line or storage tank.

(Note: for systems of 7-12 units use the SCU-401-12M system controller

for systems of 13-24 units use the SCU-401-24M system controller)

Unit Staging

Staging allows the multi-unit system to track hot water demand from the minimum ow rate of a single unit up to the
maximum output of several units. When the primary ring heater reaches ~50% of its maximum output, the system
controller activates the next unit in the system. When both these units reach ~50% of their maximum output, a third
unit is activated and so on. The SC-401-6M may also be congured to activate two heaters during primary ring to

allow for rapid initial hot water demand.

UNIT1 UNIT2 UNIT3 UNIT4 UNIT5 UNIT6

Unit Rotation

The SC-401-6M system controller rotates operation

1st 2nd 3rd 4th 5th 6th

Rotation

of the primary firing heater every 8 hours of
combustion time or up to 24 hours of plug-in time.
This helps to ensure even usage of all units.

6th 1st 2nd 3rd 4th 5th

Rotation

5th 6th 1st 2nd 3rd 4th

Rotation

4th 5th 6th 1st 2nd 3rd

System Selection

The SC-401-6M allows the user to select two additional
system types: “Recirc” and “Tank recirc.” These settings
optimize performance with recirculation and storage tank
systems, and allow the system controller to operate one or two
pumps.

Water heater

Hot water is circulated
in the piping.

Pump

Pump

The system controller
operates these pumps.

Instant hot
water is
available.

─3─

Water heater

*

These diagrams are for illustration purposes only.

Hot water is circulated
to the tank.

Pump

Pump

The system controller
operates these pumps.

Hot water

storage

tank

Pump

Instant hot
water is
available.

4. Installing the System Controller (Electrical Wiring)

System controller attachment part

System controller

Consult a qualied electrician for the electrical work.

- Do not connect electrical power to all water heaters (do not turn ON the power supply) before
all electric wiring is completed. Otherwise, electric shock or failure of the water heater and
system controller may occur.

CAUTION

This appliance must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National
Electrical Code, ANSI/NFPA 70. In Canada, the latest CSA C22.1 Electrical Code.

Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous

operation.
Verify proper operation after servicing.
Field wiring to be performed at time of appliance installation.

For NCC199 series

Open the cover of the external remote controller cord terminal block of each water heater.

Installation for unit 1 (Water heater to which system controller is installed)

Open the front cover

1. Connect the remote controller cord to the external remote
controller cord terminal block. (Refer to the remote
controller RC-9018M section of the installation manual).

2. Connect the opposite side of the remote controller cord
that was connected in the step 1 to the remote controller.

* Refer to the installation manual.

3. Slide the system controller into the bracket in the back of
the case.

Use the two included tapping screws to attach the system

controller to the inside of the heater and to connect the
ground wire.

- If a remote controller cord is not connected, the temperature of the water heater is xed to

120°F (50°C) and high-temperature hot water is discharged. So check it is surely connected.

- Be sure to tighten the screw to the terminal block manually and do not use an electric
screwdriver or impact driver. Otherwise, the terminal block may be damaged.

* Circuit board is indicated as P.C.B.

Operation Illustration

Hole for fixing the
Hole for connecting a
ground wire

Slide the system controller
into the bracket in the back
of the case.

or

Hole for
fixing the
system
controller

Hole for
connecting
a ground
wire

Ground wire

system controller

Use the tapping screws included
with the system controller.

A resin cover

B5

is included
with the

90

terminal block
part of the
system controller.
Do not remove
the resin
cover.

90

P. C.B.

P. C.B.

4. 1) Connect the connector B5 (white: nothing is
connected when the product is shipped from
factory) with a tag "SYSTEM CONTROLLER" that
comes from the P.C.B. of the water heater to the
connector B5 (white) with a red tag "to Connector
B5" that comes from the system controller.

2) Disconnect the connector (white) from the external
remote controller cord terminal block of the water
heater and the connector 90 (white) connected to
the P.C.B.

3) Connect the connector 90 (white: disconnected in
the step 2)) that comes from the external remote
controller cord terminal block of the water heater
to the connector 90 (yellow) with a tag "to Remote
Controller Terminal" that comes from the system
controller.

4) Connect the connector 90 (white: disconnected in
the step 2)) that comes from the P.C.B. of the water
heater to the connector 90 (yellow) with a tag "to
Connector 90" that comes from the system controller.

External remote
controller cord
terminal block

To system controller

To external remote
controller cord
terminal block

Red tag
"to Connector B5"

Tag "to Connector 90"

Tag "to Remote
Controller Terminal

External remote
controller cord
terminal block

To system controller

To system controller

Red tag
"to Connector B5"

B5

90

Black

Red

<Details on connector>

Blue

Blue

<Details on connector>

B5B5

90

4)

3)

90

Blue

Blue

Blue

Blue

tag
"SYSTEM
CONTROLLER "

1)

1)

B5

909090

2) Disconnect for
connecting the
system controller.

1)

Connect

B5

B5

(White)

(White)

2)

Disconnect

90

90

(White)

(White)

90

90

3)

Connect

90

90

(White)

(Yellow)

4)

Connect

90

90

(White)

(Yellow)

P. C.B.

Blue

Red

Blue

Blue

P. C.B.

Blue

Blue

Blue

Blue

To P. C.B.

To P. C.B.

tag "SYSTEM
CONTROLLER"

To external remote
controller cord
terminal block

To P. C.B.

─4─

r

<Remote controller cord>

Installation for each water heater of unit 1 (Unit 2 to 6: water heater to which the system controller is not attached)

Operation Illustration

5. Using the remote controller cord from each water heater,

plug the connector into the system controller plugs for

units 2-6.
(The number of the remote controller cords necesary is
determinated by the total number of heaters minus one.)

1) Connect the connector for the communication

cord with unit 2 of the system controller with the
connector side of the remote controller cord.

The connector No.2 is for unit 2 and the connector No. 3

is for unit 3.

* When the system controller is installed, take care not

to damage the electric component in the water heater
and bond the slack electric component with the included

vinyl tie so that it oats on the bottom surface.

water heater

Remote

connection

controller

terminal

cord

connector for the
communication cord with
water heater.

For unit 1
(system controller)

Remote controller cord

(Required accessory)

to the linked water heater

To remote controller

water heater
connection
terminal

system
controller

( )

plug

B5

B5

90 90

1)

90 90

Remote controller cord

To unit 2

To unit 3

P. C.B.1)

Y terminal sideConnector side

connector No.2

connector No.3

connector No.4

connector No.5

connector No.6

To each water heate
(unit 2 to 6)

Installation of each water heater (

6. Connect Y terminal side of the remote controller cord

that was connected in the step 5 to the corresponding
external remote controller cord terminal block of unit 2 to 6.

2 to 6: water heater to which system controller is not installed)

Unit

* Do not have to

Unit 2 Unit 6

P. C.B.

open the front
covers of these

P. C.B.

units.

For system controller

* After all connections are made, replace the front cover of unit #1 (taking special care to do not crush any wires) and the

covers of the external remote controller cord terminal blocks of all connected water heaters.

─5─

5. Wiring Diagram

Unit 2

Units 3-6

Unit 1

Remote Controller Cord

Remote Controller Cord

Remote
Controller

Remote controller
terminal block

No.6

90 90

90

90

89

102

PCB

Power
PCB

B5 B5

System Controller

No.5

No.4

No.3

No.2

Remote Controller
terminal block

Remote controller
terminal block

Remote Controller Cord

PCB

Power
PCB

PCB

Power
PCB

When six units are installed

* Connect these to the

remote control terminal
block in each unit

Main power supply to
system controller

Grounding wire

* The remote controller terminal

location may differ depending on
the unit.

* To turn OFF the power supply

to the system controller, you will
need to cut power to both the
primary heater and all attached
heaters.

Sub power supply to
System Controller

─6─

6. Remote Controller

Remote Controller (Required Accessory : RC-9018M)

The remote controller will emit a tone when a button is pressed.

*

This Remote Controller is not resistant to water, steam, chemicals, or UV rays. Install it in a location where it will not be
exposed to these conditions. If it must be installed outdoors, use a weatherproof enclosure. Refer to the RC-9018M
Installation Manual for details.

Alarm Off Button

Prog Button / Indicator (Red)

Activates the automatic water heater power
“ON” or “OFF” setting as determined by the
user selected schedule.

Power ON /OFF Button

/ Indicator (Green)

For turning the water heater
on/off.

Stops the tone that is emitted
when an error occurs.
(page 28.)

/ Indicator (Red)

Speaker

Menu Button

* 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 is meant
for

installation or service

personnel only.

Cover shown in
the open position.

Back Button

Returns to the previous
screen while making system
settings or checking status.

Display Screen

(Next page)

Status Button

Check the status of the
system or the number of
installed units.
(page 15, 28.)

Remote Controller
Part Number

The part number is
printed on the surface
of the cover.

Lock Button

Locks remote controller
operation.

Conrms changes

made by the user.

Hot Water Temperature
Setting Buttons

For setting the hot water
temperature, and
other settings.

(page 19.)

Enter Button

─7─

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 ame symbol is displayed during

combustion when using hot water or
recirculation functions.

Display for Temperature Setting

During normal operation, the set
temperature is displayed.

Display for High Temperature

Displays when the set temperature
is 125°F/55°C (131°F) or higher.

Temperature Setting

(Ex.: 110°F)

Clock Display

(Ex.: AM10:15)
Normally the clock display is not shown when
the power ON/OFF button is "OFF".
* This setting can be changed so that the clock is displayed
even when the power button is turned "OFF".

Error Code

A number will ash if a

failure occurs. (page 28.)

(page 18.)

*

For systems that use recirculation operation, the symbol
is displayed when the power ON/OFF button is set to "ON".

*

It is displayed during the recirculation operation.

Display for Recirculation Operation

Locked Display

The lock symbol is displayed
when the remote controller is
locked.

The clock symbol is displayed
when the recirculation timer is
activated.

(page 19.)

Recirculation Timer

(page 13 - 14.)

Note: As shipped from the factory, the remote controller is set to display in °F and gallons.

To adjust the display to °C and liters, refer to the

page 12

.

What is the home screen?

The home screen is displayed when the button is "ON".

Normally, the hot water temperature and the clock, etc. are displayed.

<Home Screen Example>

─8─

7. Remote initial setup

Initial Setting Procedure in the “System Settings” Screen

Note: When power is rst connected to the multi-unit system (system

controller and units), the remote enters an initial setting mode.
The following instructions explain how to perform an initial setting.
If you need to change these settings at a future date, follow the
instructions titled System Selection and Settings in the “Initial
Settings” Screen (page 10 - 12).

Operation Screen Display Description

Preparation

Press the

1

1) You will be prompted to choose

2

3

a system type.

2) Use the

to the correct system type.

(Standard, Recirc., or Tank Recirc.)

3) Press the

select your system type.

1) If you chose the “Recirc.” or
“Tank Recirc.” systems, you
will be prompted to turn pump
rotation on or off (this setting
is set to “off” by default).

Connect power to all heaters in multi-unit system.

button on the remote.

buttons to navigate

button to

* Note: only when you connect one/two

pumps to the system controller, you
need to select “Yes” or “No”.

4

2) Use the

yes (on) or no (off).

3) Press the

the pump rotation.

1) You will now be prompted to
“complete system setting.”

2) Press the

complete the system setting.

3) Once you choose “Complete
system settings?”, the
remote will display “System
settings completed”.

buttons to select

button to set

button to

─9─

* Note: if you chose standard system in

step 2 - 2), you will immediately go to
this prompt.

* You may use the

return to the previous menu at any
time.

button to