Noritz SC-301-6M-EXT Installation Manual
System Controller
CAUTION
SC-301-6M-EXT
In order to use this product safely,
read this installation manual carefully
and follow the installation instructions.
Installation Manual
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. Required Accessories ................................................2
3. Introduction ................................................................3
4. Installing the System Controller .................................4
5. Wiring Diagram, System Diagram.............................. 6
6. Remote buttons and display overview .......................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, please contact Noritz America
Engineering & Service at 866-766-7489 or visit http://support.noritz.com/.
SBA8939
Rev. 5/12
──
*SBA8939*
1. Included Accessories
Part Shape Qty Part Shape Qty
Tapping Screw
Check for any missing items
before starting installation.
*1
3
Vinyl Tie
3
Installation Manual
(this document)
Insulated Cords
*1 : Use the included vinyl tie to bind any excess length of wire
1 Wall Anchor 3
2
2. Required Accessories
Name Usage Qty
Remote controller
RC-9018M
Remote controller Cord
RC-CORD10
RC-CORD26
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.
* 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.
Total number of units
in system - 1
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-301-6M 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-301-6M RC-9018M
1 to 6 SC-301-6M RC-9018M
System controller Remote controller
──
3. Introduction (see list of points below)
<Recirc>
<Tank recirc>
Introduction to the “SC-301-6M” System Controller
Overview
This manual is intended to provide instruction for the installation, operation, and features of the SC-301-6M system
controller. It is divided into 4 main sections:
1. Installation of the SC-301-6M system controller
2. Initial programming of the RC-9018M remote controller
3. Additional features of the RC-9018M remote controller and the SC-301-6M system
controller
4. Plumbing diagrams and general information about water and gas piping
Please read this manual carefully and follow the instructions as written. If you have any questions, please contact
Noritz Engineering & Service at 866-766-7489 or visit http://support.noritz.com/.
Basic Operation
The SC-301-6M 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.
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-0-6M may also be congured to activate two heaters during primary ring to
allow for rapid initial hot water demand.
Unit Rotation
The SC-301-6M system controller rotates operation
of the primary firing heater every 8 hours of
UNIT1 UNIT2 UNIT3 UNIT4 UNIT5 UNIT6
1st 2nd 3rd 4th 5th 6th
Rotation
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-301-6M 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
Instant hot
water is
available.
──
The system controller
operates these pumps.
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
Figure 1: Removing the Sub-Panel
Securing to the wall
●
The weight of the device will be applied to the wall. If the strength of the wall is not sufcient, reinforcement
must be done to prevent the transfer of vibration.
●
Do not drop or apply unnecessary force to the device when installing. Internal parts may be damaged and
Be sure to do
may become highly dangerous.
●
Install the unit on a vertical wall and ensure that it is level.
Check
CAUTION
•
When installing with bare hands, take caution to not inict injury.
•
Be careful not to hit electrical wiring, gas, or water piping while drilling holes.
1. Remove the Sub-Panel by removing the six (6) screws as shown in
Figure 1. Pull the Sub-Panel out of the box.
* Remove the grounding wires, which are tightened on the sub-panel.
2. Three (3) mounting holes can be found once the Sub-Plate is removed
(Figure 2). Hold the box in position and use the three (3) included
mounting screws to secure the System Controller to a wall.
3. If mounting the box to drywall or masonry, use the provided wall an-
chors to secure the System Controller to a wall.
4. After the box has been properly mounted, use the removed screws to
reattach the Sub-Panel back onto the box.
* Do not to forget to tighten the grounding wires, which were removed
in the step 1, with the sub-panel.
5. Take waterproong measures so the water does not enter the building
from the screws used to mount the device.
• Make sure the unit is installed securely so that it will not fall or move
due to vibrations or earthquakes.
Electrical Wiring
Consult a qualied electrician for the electrical work.
Illustration
2
1
System Controller
Sub-Panel
6
Figure 2: Provided Mounting Holes
1
3
5
4
2
3
- 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:
Electrical Shock Hazard
Do not turn power on until electrical wiring is nished. Disconnect power before servicing.
Failure to do so may result in death or serious injury from electrical shock.
Ground
• Connect a grounding wire comes from the system controller to unit 1 (Refer to page 5).
An electrician should do this work.
Do not connect the ground to the city water or gas piping. Do not tie the ground to a telephone line.
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.
- If a remote controller cord is not connected, the temperature of the water heater is xed to 0°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.
WARNING
CAUTION
Electrostatic discharge can affect electronic components. Take precautions to prevent electrostatic discharges from personnel
or hand tools during the system controller installation and servicing to protect the product’s electronic control.
──
For NC1991 series
Unit 1
(The Unit with the Remote Controller)
P.C.B.
90
B5
"SYSTEM CONTROLLER" tag
90
Remove it for connecting
the system controller.
water heater connection terminal
Unit 1
* Circuit board is indicated as P.C.B.
Open the cover of the external remote controller cord terminal block of each water heater.
Construction work for unit 1 (Water heater to which remote controller is attached)
Operation Illustration
Open the front cover
1. Connect the remote controller cord to the external remote
(The Unit with the Remote Controller)
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
"SYSTEM CONTROLLER" tag
was connected in the step 1 to the remote controller.
* Refer to the installation manual.
3. 1) Disconnect the connector 90 (white) from the P.C.B. of
the water heater.
B5
90
Use the insulated cord labeled “DVC ERV” and connect the
two connectors with the labeled end to the water heater.
Install the cord to the water heater and connect the
two connectors to the two disconnected connectors 90
(white) of the water heater.
Install the other end of the cord to the system controller.
2)
Connect the connector with the green/red wires to the
connector 90 (yellow) with a tag “to Connector 90” that
comes from the system controller.
Then, connect the connector with the black/white wires to
the connector 90 (yellow) with a tag “to Remote Controller
Terminal” that comes from the system controller.
3) Use the remaining insulated cord and connect the
connector to the water heater.
Install the cord to the water heater and connect the
connector to the connector B5 (white) with a tag
“SYSTEM CONTROLLER” that comes from the P.C.B.
of the water heater.
System Controller
Connector color: yellow
B5
90
90
4) Install the other end of the cord to the system controller.
Plug the cord into the connector B5 (white) labeled “to
connector B5” coming from the system controller P.C.B.
5) Pull a grounding wire in the junction box of Unit 1 and
tighten the round terminal of the grounding wire with a
grounding screw of the unit.
If there is a electrical conduit, place the grounding wire
in the electrical conduit.
(For the attachment to the junction box, refer to the
installation manual of the unit.)
P.C.B.
90
Remove it for connecting
the system controller.
P.C.B.
"SYSTEM CONTROLLER" tag
B5
90
90
"DVC ERV" tag
Construction work for each water heater (Unit 2 to 6: water heater to which the remote controller is not attached)
4.
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.
Unit
Construction work 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.
Remote controller cord
(Required accessory)
Remote
water heater
controller
connection
cord
terminal
to the linked water heater
(system controller plug)
connector No.2
connector No.3
connector No.4
connector No.5
connector No.6
System Controller
Connector color: yellow
B5
90
90
2 to 6: water heater to which remote controller is not attached)
* Do not have to open
the front covers of
Unit 2 Unit 6
P.C.B.
these units.
For system controller
P.C.B.
* 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, System Diagram
Unit 1
Wiring Diagram (Multi-unit System Wiring)
When six units are installed
* Connect these to the remote control terminal block
in each unit
No.6
No.5
No.4
No.3
No.2
System Controller
Remote controller
terminal block
Remote Controller Cord
Grounding wire
Remote
Controller
909089
B5
102
Power
PCB
PCB
Junction box
Remote Controller
terminal block
Remote Controller Cord
Remote controller
terminal block
Remote Controller Cord
Unit 2
Units 3-6
PCB
Power
PCB
PCB
Power
PCB
* 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.
─6─
6. Remote button and display overview
Remote Controller (Required Accessories : 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. Please install it in a location where it
will not be exposed to these conditions. If it must be installed outdoors, please use a weatherproof enclosure. Consult
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.
Conrms changes
made by the user.
Hot Water Temperature
Setting Buttons
For setting the hot water
temperature, and
other settings.
(page 19.)
Enter Button
──
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 5°F/55°C (°F) or higher.
Temperature Setting
(Ex.: 0°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>
──
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.
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
(Standard, Recirc., or Tank Recirc.)
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
──
* 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
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