Leda LCN20 Installation instructions

Gas Water Heaters
Installation and Owner Manual
MODELS LCN20/LCL20, LCN26/LCL26 - FOR EXTERNAL INSTALLATION ONLY

2
CONTENTS
IMPORTANT・・・・・・・・・・・・・・・・・・・・・
FOR THE INSTALLER・・・・・・・・・・・・・・・・
・
FOR THE SERVICER・・・・・・・・・・・・・・・・・
FOR THE PLUMBER・・・・・・・・・・・・・・・・・
SPECIFICATIONS・・・・・・・・・・・・・・・・・・
INTRODUCTION・・・・・・・・・・・・・・・・・・・
DIMENSIONS AND CONNECTION POINTS・・・・・・・
SAFETY GUIDELINES・・・・・・・・・・・・・・・・
INSTALLATION・・・・・・・・・・・・・・・・・・・
CONFIRM THE APPLIANCE SUITABILITY・・・・・・・・
ABOUT SELECTING
A INSTALLATION LOCATION・・・・・・・・・・・・
CLEARANCES FOR OUTDOOR
HEATER LOCATIONS – AS5601・・・・・・・・・・・
GAS CONNECTIONS・・・・・・・・・・・・・・・・
SIZING AND CONNECTING・・・・・・・・・・・・・・
MEASURING INLET GAS PRESSURE
AND TESTING GAS LEAKGAE・・・・・・・・・・・
WATER CONNECTIONS・・・・・・・・・・・・・・・
ELECTRICAL CONNECTIONS・・・・・・・・・・・・
REMOTE CONTROLLER・・・・・・・・・・・・
・・・
REMOTE CONTROLLER INSTALLATION・・・・・・・・
・
CONNECTION OF REMOTE CONTROLLER
WIRING TO THE WATER HEATER・・・・・・・・・・
・
2
2
2
3
3
4
5
6
7
7
8
9
10
10
11
12
13
14
15
16
INITIAL OPERATION・・・・・・・・・・・・・・・
NOMAL OPERATION・・・・・・・・・・・・・・・
WITHOUT REMOTE CONTROLLER・・・・・・・・・
WITH ONLY MAIN
REMOTE CONTROLLER・・・・・・・・・・・・
WITH MULTIPLE REMOTE CONTROLLRE・・・・・・
FREEZE PREVENTION・・・・・・・・・・・・・・
WINTER SHUTDOWN・・・・・・・・・・・・・・・
MAINTENANCE AND SERVICE・・・・・・・・・・
UNIT DRAINING and FILTER CLEANING・・・・・・・
GENERAL TROUBLE SHOOTING・・・・・・・・
PCB ERROR CODES・・・・・・・・・・・・・・・
WIRING DIAGRAM・・・・・・・・・・・・・・・・
OPERATING SAFETY・・・・・・・・・・・・・・・
WATER FLOW AND
WATER TENPERATURE・・・・・・・・・・・・
WARANTY CONDITIONS・・・・・・・・・・・・・
17
18
18
18
19
20
20
21
21
22
24
25
26
28
28
IMPORTANT
This User Guide has been prepared for Installers and Servicers of the equipment. Please keep
it in a safe place for future reference.
FOR THE INSTALLER
The installation must be done in accordance with the information supplied in this User Guide.
All other relevant National, State or Local regulations must also be conformed with and these
include (but are not limited to):
Australian Standard AS3500.1 – Water Supply
Australian Standard AS3498 – Hot Water Supply
Australian Standard AS3000 – Electrical Installation
Australian Installation Code AS5601 – Gas Appliance Installation
Local Water, Gas & Electrical Authority Regulations
Municipal Building Codes
FOR THE SERVICER
Maintenance and fault-finding must be done in accordance with these instructions and the
applicable regulations listed above.
@@@@@@@@@@@WARNING@@@@@@@@@@@
Installation and service must be performed by a qualified installer (for example, a
licensed plumber or gas fitter).

3
FOR THE PLUMBER
PLEASE NOTE this water heater is supplied factory set at 70℃ outlet hot water temperature.
This water heater does require a tempering valve to be installed to comply with AS3498
/ 50C requirement.
Please follow all the installation instructions in the Installation and operating instructions
handbook and the following additional instructions for the water heater outlet connection.
1. When connecting the hot water supply to
the fixtures in the property a minimum of
One (1) Metre of pipework must be used
between the outlet of the water heater and
the first tap and outlet. See Diagram
below.
2. The Hot water line should be insulated
with Ensolex or similar pipe insulation.
3. When the installation is completed the
temperature is to be tested at the taps to
confirm the water temperature does not
exceed the required 50°C setting.
SPECIFICATIONS
MODELS
LC
N
20
/LCL20
LCN26/LCL26
Gas Input MJ/h 160 195
Inlet Pressure
kPa – Nat. Gas
1.13 min.
2.75 max.
1.13 min.
2.75 max.
Inlet Pressure
kPa - LPG 2.75 min./max 2.75 min./max.
Water Supply
Pressure
kPa
150* min.
1200 max
150* min.
1200 max.
Height mm 542 542
Depth mm 170 215
Width mm 350 350
Weight kg 15.7 17.2
Gas Connection mm 20 BSP 20 BSP
Water Connections 15 BSP 15 BSP
Ignition Electronic Electronic
Electrical Supply V 240 AC 240 AC
NOTES:
* The appliance will operate at reduced performance below 340 kPa.
For information relating to burner test point pressures and injector sizes refer to the rating
plate located on the right hand side of the cabinet for each model. (please refer to p.7)
For information relating to overall dimensions and connection points refer to diagrams.
(Please refer to p.5)
Before installing in areas over 1500 m above sea level, contact the manufacturer for
instructions.
Total length to first tap
or outlet is required to
be a minimum of 1
meter from the outlet
connection of the water
heater.
Pipe size is nominal
18mm from hot water
outlet to the first tap or
outlet.
First tap or outlet

4
INTRODUCTION
This manual provides information necessary for the installation, operation, and
maintenance of the water heater.
The model description is listed on the rating plate which is attached to the right side of
the case of the water heater. (Please refer to p.7)
Please read all installation instructions completely before installing this product.
The Water Heater is an instantaneous, tankless water heater designed to efficiently
supply endless hot water for your needs.
The principle behind the water heater is simple:
Burner
Heat exchanger
Exhaust
F l o w s e n s o r
Thermistor
Computer
board
A C 2 4 0V
G a s v al v e
Fan
C o l d w a t e r i n le t
G a s
H o t w a t e r o u t le t
1. A hot water tap is turned on.
2. Water enters the heater.
3. The water flow sensor detects the water flow.
4. The computer automatically ignites the burner.
5. Water circulates through the heat exchanger and then gets hot.
6. The computer will modulate the gas supply valve and water flow to produce the right
amount of hot water at the correct temperature.
7. When the tap is turned off, the unit shuts down.
※ This diagram illustrates the
w a t e r h e a t e r d e s i g n
concepts only and is not
a c c u r a t e t o t h e o n e
p h y s i c a l d e s c r i p t i o n .

5
GAS
COLD
HO T
GAS
HOT
COLD
133 124
47 GAS
330
350
520 490
3 7
198
6 0
9 4
335
7 9
1 9
41 HOT
49 COLD
170
1 5 .7
542
137
31 POWER
POWER
46:COLD
86:GAS
114:HOT
124:POWER
3 4
ACCESSORIES
Check that the installation manual and screws are included with the unit.
Screws ×4 Manual
DIMENSIONS AND CONNECTION POINTS
G A S
C O L D
HOT
G A S
H O T
C O L D
1 9
3 7
3 3 0
3 5 0
4 9 0
1 2 41 3 3
3 3 5
4 4 .5
GAS
5 2 0
4 1 H O T
4 9 C O L D
1 9 8
60
94
2 1 5
1 8 2
5 4 2
15 .7
8 4 3 4
POWER
2 5 P O W E R
Model
24
Model26
M
o
d
el
16
Model18
Model20

6
SAFETY GUIDELINES
Ensure the following safety instructions are read and understood before commencing
installation.
GENERAL
1. Carefully plan where you intend to install the Water Heater. Please ensure:
The water heater will have enough combustible air and proper ventilation.
Locate the water heater where water leakage will not damage surrounding areas.
2. Check the rating plate and gas type label for the correct GAS TYPE, GAS PRESSURE,
WATER PRESSURE and ELECTRIC RATING.
*If this unit does not match your requirements, do not install and consult with
manufacture.
3. If any problem should occur, turn off all hot water taps and turn off the gas. Then call a
trained technician or the Gas Company or the manufacturer.
@@@@@@@@@@@WARNING@@@@@@@@@@@
For the continuing safety of this water heater it must be installed and operated and
maintained in accordance with manufactures instructions.
Installation and service must be performed by a qualified installer (for example, a
licensed plumber or gas fitter).
The installer (licensed professional) is responsible for the correct installation of the
water heater and for compliance with all relevant National, State or local
regulations.
The water heater must be installed OUTDOORS ONLY. DO NOT install the
water heater indoors.
@@@@@@@@@@@WARNING@@@@@@@@@@@
Water temperatures above 70 ℃can cause severe burns or death from scalding.
Children, the disabled and the elderly are at a high risk of being injured. Feel the water
temperature before bathing or showering. Do not leave children, disabled persons, or
the elderly unsupervised. The Australian Standards AS 3498 gives full details of the
requirements for supply of controlled temperature to ablution outlets (bathrooms) and is
required to be conformed to under all plumbing codes within Australia.
Do not store or use gasoline or other flammables, vapors, or liquids in the
vicinity of this appliance.
Do not reverse the water and/or gas connections as this will damage the
gas valves and can cause severe injury or death. Follow the diagram on p.
10 and 12 when installing your water heater.
Do not use this appliance if any part has been in contact with or been
immersed in water. Immediately call a licensed plumber, a licensed gas
fitter, or a professional service technician to inspect and/or service the unit if
necessary.
Do not disconnect the electrical supply if the ambient temperature will drop
below freezing. The Freeze Prevention System only works if the unit has
electrical power. The warranty will not be covered if the heat exchanger is
damaged due to freezing. Refer to the section on the Freeze Prevention
System on p. 20 for more information.
Prohibited

7
INSTALLATION
The water heater requires careful and correct installation to ensure safe and efficient operation.
This manual must be followed exactly. Read the “SAFETY GUIDELINES” and the
“IMPORTANT” sections at the beginning of this manual.
CONFIRM THE APPLIANCE SUITABILITY
Check the gas type label and the rating plate for the correct gas type, gas pressure, water
pressure and electrical rating for your application. Do not install this unit if these requirements
can’t be met.
The manifold pressure is preset at the factory. It is computer controlled and should not
need adjustment.
Occupants are advised of any inconveniences which could occur such as disconnection of
services.
You follow the electrical earthing procedure outlined in AS3500.4 before cutting or
uncoupling existing metallic pipework.
It should be as close as practical to the hot water outlets to minimise heat loss and cost.
The water heater does not require a fireproof back plate if installed on timber wall.
Rating Label Position
on Cabinet
Gas Type Label
Position on Cabinet
@@@@@@@@@@@CAUTION@@@@@@@@@@@
This equipment is not suitable for pool or spa heating.
Water hardness may affect the water heater. It may be damaged.
It is important that the water heater is installed in water conditions that are suitable for
its efficient, long use.
This is a water heating apparatus only and the final fitness of water delivered is
dependent upon the quality of water supplied to this system.
The connection, attachment, integration or general association of other equipment or
parts not specified by the water heater which either directly or indirectly affect the
operation or performance of this equipment – could void the warranty.

8
ABOUT SELECTING A INSTALLATION LOCATION
Carefully read this section before installing, and when you select the location for install the
water heater, you must follow these precautions exactly.
You check the proximity of gas & electrical lines so as not to create a hazard and avoid
access problems for other services.
It must be located in accordance with the requirements of AS5601 and have sufficient
clearances from eaves, windows, vents etc. – see the diagram on the p.11.
“Exemption from Prescribed Statutory Requirement”: AS5601-2000 Clause 5.13.6.5, This
relates to the physical separation distance specification where multiple appliances are
employed. That equates to a minimum 150mm horizontal flue separation distance allowing
appliances to be placed side by side in the same vertical plane
Most load bearing walls such as brick, brick/veneer, weatherboard and stud-frames are
suitable locations.
Securely fasten the unit to the wall with screws or bolts in the top and bottom brackets. A
minimum of two top and bottom must be used.
@@@@@@@@@@@CAUTION@@@@@@@@@@@
This is a water heating apparatus only and the final fitness of water delivered is
dependent upon the quality of water supplied to this system.
Although the water heater is designed to operate with minimal sound, you should not
install the unit on a wall adjacent to a bedroom, or a room that is intended for quiet
study or meditation, etc.
Locate your heater close to a drain where leakage will not do damage to surrounding
areas. As with any water heating appliance, the potential for leakage at some time in
life of the product dose exist.
@@@@@@@@@@@WARNING@@@@@@@@@@@
Every care is taken to warn occupants of the building and the public of any injury that
may occur from falling tools, open trenches, water connections or any other general
hazard.
Make sure the water heater will have enough combustion air and proper ventilation.
Keep the area around the water heater clean. Particles may clog the air vent, reduce
fan function, or cause improper combustion.
Locate unit for easy access and maintain proper space for service and maintenance.
Install the unit so that it can be connected or removed easily.
The water heater must be installed outdoors only. Do not install the water heater
indoors.
Do not locate your water heater in a pit or any location where gas and water can
accumulate.

9
CLEARANCES FOR OUTDOOR HEATER LOCATIONS – AS5601
*Exemption from prescribe statutory requirements referred to in Figure 1 has been granted
to allow multiple series of the Water Heaters to be positioned side by side.

10
GAS CONNECTIONS
SIZING AND CONNECTING
Check the gas type label to make sure that the unit was built for the type of gas you will be
using, and that the gas inlet pressure is within the appropriate range. (Please refer to p.3.)
1. Gas pressure below this specified range for the water heater and/or insufficient gas volume will
adversely affect performance.
2. Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified
range will cause dangerous operating conditions and damage to the unit.
3. Until testing of the main gas line supply pressure is completed, ensure the gas line to the water
heater is disconnected to avoid any damage to the water heater.
Size the gas piping according to AS5601 installation code for the correct pipe sizing for the
water heater.
Always use approved connectors to connect the unit to the gas line. Always purge the gas
line of any debris before connecting to the water heater.
Install a manual gas shut-off valve between the water heater and the gas supply line.
The regulator is preset at the factory. It is computer controlled and is not to be adjusted by
any person other than a qualified Service Provider.
When the gas connections are completed, it is necessary to perform a gas leak test either
by applying soapy water to all gas fittings and observing for bubbles or by using a gas leak
detection device.
GAS INLET
SUPPLY
POWER CORD
GAS VALVE
a@@@CAUTION@@@a
1. Turn off the electric power to the
water heater and manual gas valve
located on the outside of the unit
before beginning gas connection.
2. Confirm the position of the gas inlet.
Do not connect water line to gas
inlet. It may be critical damaged.
@@@@@@@@@@@WARNING@@@@@@@@@@@
Conversion of this unit from natural gas to propane or propane to natural gas cannot be
done in the field. Contact your local retailer or distributor to get the correct unit for your
gas type.

11
MEASURING INLET GAS PRESSURE
AND TESTING GAS LEAKGAE
The appliance and its gas connections must be measured inlet gas pressure and leak tested
before placing the unit in operation for properly performing and safety. This is only to be
done by a licensed professional.
1. Shut off the manual gas valve on the supply
gas line.
2. Open a faucet. The unit should turn on and
the gas in the gas pipe line should purge.
Leave the faucet on to keep the unit running
until the unit shut down due to lack of gas
supply. Then shut the faucet off.
3. Remove the screw for the pressure port
located on the gas inlet of the water heater
shown in the diagram to the right.
4. Connect the manometer to the pressure port.
5. Re-open the manual gas valve. Check to see
that there are no gas leaks.
6. Open some of the fixtures that use the
highest flow rate to turn on the water heater.
7. Check the inlet gas pressure. When the
water heater is on a maximum burn, the inlet
gas pressure within must be within the
appropriate range. (Please refer to p.3)
This appliance and its individual shut-off valve must be isolated from the gas supply piping
system by unplugging the unit and turning off the main gas valve during any pressure
testing of the gas supply piping system at test pressures above 3kPa.
1. Remove the screw for pressure port
located on the gas inlet.
2. Connect the manometer to the pressure
port.
3. Check the inlet gas pressure.

12
WATER CONNECTIONS
All pipes, pipe fittings, valves and other components, including soldering materials, must be
suitable for potable water systems.
A manual shut off valve must be installed on the cold water inlet to the water heater
between the main water supply line and the water heater.
Only a gate valve or a ball valve is to be used on the cold water supply.
No stop taps or check valves are to be used as this will void the warranty and damage the
water heater.
Check the cold water pressure and if above 1000 kPa an approved limiting valve must be
fitted.
Before installing the water heater, flush the water line to remove all debris, and after
installation is complete, purge the air from the line. Failure to do so may cause damage to
the heater.
There is a wire mesh filter to discourage debris from entering your heater. Clean filter after
initial installation to ensure no debris from the pipe work has clogged it.
NOTE: This filter must be cleaned as part of regular maintenance.
HOT WATER
OUTLET
COLD WATER
INLET
DRAIN
PLUG
FILTER
GATE OR BALL
VALVE ON INLET
@@WARNING@ @
Do not reverse the hot outlet and
cold supply line connections to
the Water Heater as this will
cause your heater to operate
improperly.
1.
TURN OFF THE WATER
INLET SUPPLY VALVE.
2. OPEN A HO T WATER
TAP TO RELEASE THE
L I N E P R E S S U R E .
R E M O V E B Y T U R N I N G
COUNTERCLOCKWISE AND
THEN CLEAN AND REPLACE
FILTER

13
ELECTRICAL
CONNECTIONS
1. The water heater must be electrically grounded. Do not
attach the ground wire to either the gas or water piping.
2. The water heater requires an AC 240V 50Hz electrical
power supply and draws a current of 0.8A.
3. The weather-proof power point should be no more than 1
meter from the base of the water heater for easy access.
4. Install so that the electrical power can be switched off if
necessary.
5. If the cord supplied with this appliance must be replaced, it
must be replaced with appliance wiring material supplied by
the Manufacturer.
@@@@@@@@@@@WARNING@@@@@@@@@@@
When servicing or replacing parts within the water heater, label all wires prior to disconnection to
facilitate an easy and error free reconnection. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Weather
-
proof
Power Point

14
REMOTE CONTROLLER (OPTIONAL)
The water heater can be installed with up to three remote controllers. Each remote controller
has two functions which can adjust the set temperature and indicate the error code on the
remote controller.
The set temperature can be adjusted only by remote controller which has the priority
setting (When remote controller has the priority setting, PRIORITY lamp on remote
controller is lit), and the other remote controller(s) display the set temperature. If you
desire to transfer the priority setting, you can transfer it by pressing PRIORITY button only
when there is no water flow through the water heater. (Default set temperature is 40ºC)
All models water heater have self diagnostic function for safety and convenience when
trouble shooting. If there is a problem with the installation or the unit, it will display a
numerical error code on the remote controller (or the LED of the computer board will be
blink.)
MAIN REMOTE CONTROLLER MODEL MC100-AU3
MC100-AU3 must be installed inside (such as kitchen)
due to NO water resistant. Be careful installation
location.
It allows the output temperature from the water heater
to be adjusted within the range of 37ºC to 55ºC.
The temperature options are:
37ºC, 38ºC, 39ºC, 40ºC, 41ºC, 42ºC, 43ºC, 44ºC,
45ºC, 46ºC, 47ºC, 50ºC, 55ºC.
When “BURNER ON” lamp is lit, the set temperature
can not be adjusted to 55ºC. If you desire to set it to
55ºC, you should close the hot water tap.
MODEL FC100W-AU3 SHOWER CONTROLLER
AND SC100-AU3 ENSUITE CONTROLLER
FC100W-AU3 (Shower) and SC100-AU3 (Ensuite)
controllers are water resistant, however should not be
positioned where can be splashed directly and there
should be caulking between the surface of the wall
and the controller.
FC100W-AU3 is installed such as the main bathroom,
and SC100-AU3 is installed such as the ensuite bath
room.
These remote controller allows the output temperature
from the water heater to be adjust within the range of
37ºC to 50ºC.
The temperature options are:
37ºC, 38ºC, 39ºC, 40ºC, 41ºC, 42ºC, 43ºC, 44ºC,
45ºC, 46ºC, 47ºC, 50ºC.
When BURNER ON lamp is lit, the set temperature
can not be adjusted to 42ºC or over. If you desire
those temperatures, you should close the hot water
tap.
PRIORITY
BURNER ON
ON/OFF PRIORITY
HO T
COOL
MADE IN JAPANMain
40
Main
Shower
PRIORITY
BURNER ON
ON/OFF PRIORITY
HO T
COOL
MADE IN JAPANShower
40
Ensuite
PRIORITY
BURNER ON
ON/OFF PRIORITY
HO T
COOL
MADE IN JAPANEnsuite
40

15
REMOTE CONTROLLER INSTALLATION
1. Crimp the fork terminals to the wires.
・Minimum 18AWG wire (No polarity)
・Maximum 100m long
2. Attach the fork terminal to the connector base of
the backside unit with two screws tight.
3. Put out wiring downward through the cable trench.
4. Attach the remote control on the wall with two
attached screws. (If you need to attach the remote
control to brittle, you should use the anchor plug.)
Connector base
@@@@@@@@@@@WARNING@@@@@@@@@@@
DO NOT locate the remote controls where they may come into contact with water.
DO NOT position the remote controls in the vicinity of chemicals.
DO NOT position the remote controls over a cooker, grill or toaster.
DO NOT position the remote controls where materials may spill onto them.
PLEASE NOTE IF THE CONTROLS ARE TO BE FITTED TO A METAL SURFACE
AN INSULATION PLATE SHOULD BE PROVIDED BEHIND THE MOUNTING
POSITION.
REMOTE CONTROL WIRING
Use the f o r k t ermina l s

16
CONNECTION OF REMOTE CONTROLLER WIRING
TO THE WATER HEATER
1. Turn off the power supply to the water heater.
2. Remove the front cover from the water heater. There are 3 screws on the front cover.
3. Put the remote wires through the hole on the bottom of the unit's casing.
4. Remove the plastic cover and connect remote control wires to remote terminals directly.
(There is no polarity in the terminations.)
*DO NOT jump or short-circuit wires. Computer will be damaged.
5. Replace the plastic cover and the front cover. And connect the power plug.
REMOTE CONTROL – CABLE CONNECTIONS
TYPICAL CABLE LAYOUT
12345678
PLASTIC
COVE R REMOTE CONTROL
CABLE
REMOTE CONTROL
TERMINAL
REMOVE THE PLASTIC COVER
AND CONNECT TO TERMINALS
DIRECTLY BEHIND THE COVER
Put the remote wires through the hole
on the bottom of the unit's casing.
1 2 3 4 5 6 7 8
MC100-AU3 SC100-AU3FC100W-AU3

17
INITIAL OPERATION
Check the GAS and WATER CONNECTIONS for leaks before firing it for the first time.
Open the main gas supply valve to the unit using only your hand to avoid any spark. Never
use tools. If the knob will not turn by hand, do not try to force it; call a qualified service
technician. Forced repair may result in a fire or explosion due to gas leaks.
Be sure to check next to the bottom of the unit because some gases are heavier than air and
may settle towards the floor.
Check the GAS PRESSURE. Refer to p.10.
Do not try to light the burner manually. It is equipped with an electronic ignition device which
automatically lights the burner.
Check for PROPER VENTING and COMBUSTIBLE AIR to the heater.
Purge the GAS and WATER LINES to remove any air pocket.
Do not use this water heater if any part has been submersed under water. Immediately call a
qualified service technician to inspect the water heater and to replace any damaged parts.
CAUTION: IF YOU SMELL GAS:
Do not try to start the water heater.
Do not touch any electric switch; do not use any 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.
1. Once the above checks
have been completed,
please clean filter of any
debris. Refer to p. 21 for
instructions.
2. Fully open the manual
water control valve on the
water supply line.
3. Open a hot water tap to
verify that water is flowing
to that tap.
Then close the hot water tap.
4. Fully open the manual
gas control valve
installed.
5. Turn on the 240 volt 50 Hz
power supply to the water
heater.
6. Now you are ready to
enjoy hours of endless
hot water.
FOR YOUR SAFETY, READ BEFORE OPERATING:

18
NORMAL OPERATION
Flow rate to activate the water heater : 3.0 litter per minute
Flow rate to keep the water heater running : 2.5 litter per minute
WITHOUT REMOTE CONTROLLER
1. Open a hot water tap. 2. Mix cold water with the hot to get
the correct temperature water.
3. Close the hot water tap.
NOTE: The water temperature is set at 70ºC from the factory.
If you desire to change the set temperature without remote controller, refer to
diagram on below.
Only change the switches with dark squares.
DO NOT adjust other switches.
NORMAL OPERATION
WITH ONLY MAIN REMOTE CONTROLLER (MC100-AU3) INSTALLED
1. Press the ON/OFF button. And then ensure
the priority lamp is lit and displayed the set
temperature on the remote controller.
2. Set temperature which you want. When
adjust the set temperature with MC100-AU3,
it allows the output temperature from the
water heater to be adjust within the range of
37ºC to 55ºC. (please refer to P.14)
3. Open a hot water tap, and ensure the
BURNER ON lamp is lit. Mix cold water with
the hot if you need.
4. Close the hot water tap, and ensure the
BURNER ON lamp is OFF.
MC100-AU3
PRIORITY
BURNER O N
ON/OFF PRIORITY
HOT
COOL
MA DE IN JA PA NMain
40
ON/O FF
butt on
Displayed
set te mperatur e
BUR NER ON lamp
Set temperature
adjust button
PRIO RITY
butt on
PRIORITY lam p
45 ℃ 40 ℃ 55 ℃
50 ℃
error60 ℃ error
DEFAULT
Temperature S ettings
OFF
ON
567856785678 5678
OFF
ON
OFF
ON
OFF
ON
5678 56785678
OFF
ON
OFF
ON
OFF
ON
5678
OFF
ON
70 ℃
TMP3 TMP2 TMP1
TMP3 TMP2 TMP1
TMP3 TMP2 TMP1
TMP3 TMP2 TMP1 TMP3 TMP2 TMP1
TMP3 TMP2 TMP1 TMP3 TMP2 TMP1
TMP3 TMP2 TMP1

19
NOMAL OPERATION
WITH MULTIPLE REMOTE CONTROLLER INSTALLED
1. Press the ON/OFF button. Then ensure the
priority lamp is lit on the remote controller and
the set temperature is displayed on the each
remote controller.
2. Set temperature which you need. (The
temperature setting can be changed by only
priority unit. If you desire to transfer the
priority setting, you can transfer it by
pressing PRIORITY button only if no water
flow.)
When adjust the set temperature with MC100-
AU3, it allows the output temperature from the
water heater to be adjust within the range of
37ºC to 55 ºC. And When adjust the set
temperature with SC100-AU3 and FC100W-
AU3, it allows the output temperature from the
water heater to be adjust within the range of
37ºC to 50ºC.
NOTE: Each remote controller can individually
store the temperature setting. However –
＜MC100-AU3 ＞
When the priority setting is transferred to
MC100-AU3, if the previous temperature
setting which stored in MC100-AU3 was
55ºC, it become to 50℃.
＜FC100W-AU3 , SC100-AU3＞
When the priority setting is transferred to
FC100W-AU3 (or SC100-AU3), if the
previous temperature setting which
stored in FC100W-AU3 (or SC100-AU3)
was 43ºC and above, it become to 42ºC.
3. Open a hot water tap, and ensure the BURNER
ON lamp is lit. Mix cold water with the hot if you
need.
4. Close the hot water tap, and ensure the
BURNER ON lamp is OFF.
@@@@@@@@@@@WARNING@@@@@@@@@@@
Water temperatures above 70 ℃can cause severe burns or death from scalding.
Children, the disabled and the elderly are at a high risk of being injured. Feel the water
temperature before bathing or showering. Do not leave children, disabled persons, or
the elderly unsupervised. The Australian Standards AS 3498 gives full details of the
requirements for supply of controlled temperature to ablution outlets (bathrooms) and
is required to be conformed to under all plumbing codes within Australia.
FC100W-AU3
SC100-AU3
PRIORITY
BURNER ON
ON/OFF PRIORITY
HO T
COOL
MADE IN JAPANShower
40
ON /OFF
bu tton
Displayed
set temperature
BURNER ON l amp
Set te mperature
adju st button
PRIORITY
button
PRIORITY lamp
PRIORITY
BURNER ON
ON/OFF PRIORITY
HO T
COOL
MADE IN JAPANEnsuite
40
ON/OF F
butto n
Displ ayed
set tem peratu re
B URNER ON l amp
Set te mperat ure
adjust butto n
PRIOR ITY
butto n
PRIOR ITY lamp

20
FREEZE PREVENTION
This unit comes equipped with heaters that discourage the unit from freezing. For this freeze
prevention system to operate there has to be electrical power to the unit. The freeze
prevention devices will not work if the electrical power source is disconnected. The unit has
been rated for temperatures down to -15 ℃in a wind free environment. Do not install the
water heater in an area with extremely cold weather.
WINTER SHUTDOWN
If you will not be using your heater for a long period of time or if the temperatures will drop
below –15 ℃with the wind chill factor, turn off your heater and drain the unit of water. This will
keep your unit from freezing and being damaged.
Follow these instructions carefully:
1. Close the manual gas shut off valve.
2. Turn off the power supply to the water heater.
3. Close the manual water shut off valve located
on the water supply line.
4. Open all hot water taps in the house.
(Bathroom, kitchen, laundry room, etc.). When
the water flow has ceased, close all hot water
taps.
5. Have a bucket or pan to catch the water from
the unit’s drain plugs. Unscrew the drain plugs
to drain all the water out of the unit.
6. Wait a few minutes to ensure all water has
completely drained from unit.
7. Securely screw the drain plugs back into place.
Hand-tighten only.
When it is again safe to use the water heater:
Make sure all hot water taps are closed and the drain plugs are securely attached.
Purge the water line of debris.
Turn on the manual water control valve located on the water supply line.
Open all the hot water taps to verify water flows to the taps. Close hot water taps.
Turn on the manual gas control valve located on the gas supply line.
Turn on the power supply to the Water Heater.
GASCOLDHOT
@@@@@@@@@@@CAUTION@@@@@@@@@@@
The pipe heaters are located on the Water Heater only. Any hot or cold water pipes
located outside of the unit will not be protected. Properly protect and insulate these
pipes from freezing.
POWER
SUPPLY
MANUAL
GAS VALVE
MANUAL
WATER VALVE
DRAIN
PLUG