Dux 26ENG5L User manual

Installation Manual
To be installed and serviced only by an authorised person.
This appliance is not suitable for use as a pool heater.
The “authorised installing person” is responsible for:
1. Correct commissioning of this appliance
2. Ensure unit performs to the specification stated on the data label
3. Demonstrate operation of unit to customer before leaving
4. Hand these instructions to customer
This appliance must be installed in accordance with the manufacturer’s installation instructions and Plumbing
Code of Australia (PCA) and all Local Building, Water and Gas fitting regulations (AS/NZS 5601, AS/NZS 3000, AS/
NZS 3500.4).
Failure to install this appliance in accordance with these installation instructions may void warranty.
In the interest of continued product improvement, Dux Manufacturing reserves the right to alter these
specifications without notice.
AU Service Department : 1300 365 115
NZ Service Department : 0800 729 389
FOR CONTINUED SAFETY OF THIS APPLIANCE IT
MUST BE INSTALLED, OPERATED AND MAINTAINED
IN ACCORDANCE WITH THE MANUFACTURER’S
INSTRUCTIONS.
WARNING
(e.g. 26ENG5N)
Non Condensing Models
26ENG5N
26ENG5L
26ENG6N
26ENG6L
21ENB5N
21ENB5L
21ENB6N
21ENB6L
17ENB5N
17ENB5L
17ENB6N
17ENB6L
FH9M002
Rev. 09/21 GISI094

Installation Manual
2
Potential dangers from accidents during installation and use are divided into the following four categories.
Closely observe these warnings, they are critical to your safety.
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury.
Indicates a potentially hazardous situation which, if not avoided, may result in
property damage.
DANGER
WARNING
CAUTION
NOTICE
Requests to Installers
• In order to use the Water Heater safely, read this installation manual carefully, and follow the installation
instructions.
• Failures and damage caused by erroneous work or work not as instructed in this manual are not covered by
the warranty.
• Check that the installation was done properly in accordance with this Installation Manual upon completion.
• After completing installation, either place this Installation Manual in a plastic pouch and attach it to the
side of the Water Heater (or the inside of the pipe cover or recess box if applicable), or hand it to the
customer to retain for future reference. Also, be sure to fill in all of the required items on the warranty and
to hand the warranty to the customer along with the Owner’s Guide.
• The Water Heater must be commissioned including checking gas supply pressures at maximum demand.
• The operation of the Water Heater should be explained including normal operation and regular
maintenance.
CAUTION
If the information in this manual is not followed exactly, a fire or explosion may result causing property
damage, personal injury or death.
WARNING

Installation Manual
3
Contents
1. Before Installation 4
2. About the Water Heater 5
3. Choosing an Installation Location 11
4. Installation Clearances 12
5. Installation of the Water Heater 13
6. Connecting the Gas Supply 14
7. Connecting the Water Supply 19
8. Connecting Electricity 21
9. Remote Controller 22
10. Trial Operation 25
11. Maintenance 27

Installation Manual
4
1. Before Installation
Check the Gas
• Check that the data label (left side of casing).
• Check that the gas supply pipe is sized for
26ENG5(6)N: 195 MJ/hr
26ENG5(6)L: 195 MJ/hr
21ENB5(6)N: 159 MJ/hr
21ENB5(6)L: 159 MJ/hr
17ENB5(6)N: 125.5 MJ/hr
17ENB5(6)L: 127 MJ/hr
• DO NOT OPERATE WITH ANY OTHER GAS
TYPE.
Check the Power
The power supply required is 230- 240 VAC, at
50 Hz.
Using the incorrect voltage may result in fire or
electric shock.
Warning labels
Located on the front and left hand side of the
casing-PLEASE READ THESE LABELS CAREFULLY!
If the appliance delivers water in excess of
50 Degrees, the following warning must be
adhered to:
THIS APPLIANCE MAY DELIVER WATER
AT HIGH TEMPERATURE. REFER TO THE
PLUMBING CODE OF AUSTRALIA (PCA),
LOCAL REQUIREMENTS AND INSTALLATION
INSTRUCTIONS TO DETERMINE IF ADDITIONAL
DELIVERY TEMPERATURE CONTROL IS
REQUIRED.
If the appliance is 50 degree locked model, the
following statement & warning must be adhered
to:
WARNING
(For NG Gas)
xx
xxxxxxxx
xx
xx xx
xx
Do Not Use Appliance for Purposes Other Than
Those Specified
Do not use for other than increasing the
temperature of the water supply, as unexpected
accidents may occur as a result.
Check Water Supply Quality
If the water supply is hard, acidic or otherwise
impure, treat the water with approved methods
in order to ensure full warranty coverage.
See water quality statement on page 27.
Frost Protection
When installed, power to the appliance must
be kept switched on, otherwise the appliance
should be drained.
This prevents water freezing, and causing
damage to the Water Heater.
CAUTION
• This appliance is suitable for potable water
applications.
• Do not use this appliance if any part has been
underwater. Immediately call a qualified
service technician to inspect the appliance
and replace any part of the control system
and gas control which has been under water.
NOTICE
THIS APPLIANCE DELIVERS WATER NOT
EXCEEDING 50 C IN ACCODRANCE WITH AS
3498.
WARNING — THIS APPLIANCE MUST ONLY
BE INSTALLED IN ACCORDANCE WITH THE
ACCEPTABLE PLUMBING CONFIGURATIONS
SPECIFIED IN THESE INSTRUCTIONS. FAILURE
TO DO SO MAY RESULT IN CONDITIONS
WHERE DELIVERY TEMPERATURE CONTROL IS
INADEQUATE.

Installation Manual
5
2. About the Water Heater
Anchoring Screw (× 5)
Owner’s Guide,
Installation Manual (this document) (1 each)
The following accessories are included with the
Water Heater.
Check for any missing items before starting
installation.
2.1 Included Accessories

Installation Manual
6
• Specifications may be changed without prior notice.
• The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water
temperature.
2.2 Specifications
Item Specification
Model
Name
50°C model 26ENG5N 26ENG5L 21ENB5N 21ENB5L 17ENB5N 17ENB5L
55°C model 26ENG6N 26ENG6L 21ENB6N 21ENB6L 17ENB6N 17ENB6L
Type Installation Outdoor, Wall mounted
Air Supply / Exhaust Power Flue
Operating Pressure 200-1,000 kPa
Minimum Flow Rate 1.5 L/min 2.5 L/min
Dimensions (Height) × (Width) × (Depth) 520 mm × 350 mm × 170 mm
Weight 16 kg 15 kg 14 kg
Water Holding Capacity 0.7 L 0.5 L
Connection
Sizes
Water Inlet R 3/4 (20 mm)
Hot Water Outlet R 3/4 (20 mm)
Gas Inlet R 3/4 (20 mm)
Power
Supply
Supply 230- 240 VAC (50 Hz)
Consumption
NG/ULPG 55.0 W / 60.0 W 36.0 W / 49.0 W 31.0 W / 41.0 W
Freeze
Prevention 106 W 129 W
Burner Injector Size NG 1.45 mm / 2.1 mm 1.2 mm / 2.0 mm 1.2 mm / 1.8 mm
ULPG 1.0 mm / 1.4 mm 0.9 mm / 1.4 mm
Accessories Anchoring Screws
Item Maximum Performance
Model
Name
50°C model 26ENG5N 26ENG5L 21ENB5N 21ENB5L 17ENB5N 17ENB5L
55°C model 26ENG6N 26ENG6L 21ENB6N 21ENB6L 17ENB6N 17ENB6L
Gas Consumption NG 195 MJ/hr 159 MJ/hr 125.5 MJ/hr
ULPG 195 MJ/hr 159 MJ/hr 127 MJ/hr
Maximum Hot Water Capacity (25°C Rise) 26 L/min 21 L/min 17 L/min
Performances

Installation Manual
7
2.3 Dimensions
120
120
32
FLUE COLLAR
AIR INLET
STATUS DISPLAY
350
519
264
41
486
43
39
334
GAS INLET
WIRING THROUGHWAYS
AIR INLET
COLD WATER INLET
(WATER FILTER)
WATER DRAIN VALVE
HOT WATER OUTLET
PRESSURE RELIEF VALVE
(WATER DRAIN VALVE)
80
2×6×24 OBLONG HOLE
6541
13
2×6×24 OBLONG HOLE
2×
6
80
2× 13
AIR INLET
27
16 170
20.5
487
16
71
94
85
64
179
252
62
129
HOT WATER OUTLET(R3/4
)
WIRING THROUGHWAYS
COLD WATER INLET(R3/4)
(VIEW FROM TOP)
GAS INLET(R3/4)
338
HEIGHT OF EACH FITTINGS
FROM BOTTOM OF CASE
HOT WATER OUTLET
COLD WATER INLET
GAS INLET
45
53
44
< Unit: mm >
26ENG series

Installation Manual
8
17/21ENB series
HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE
HOT WATER OUTLET
COLD WATER INLET
GAS INLET
45
48
50
<Unit : mm>
486
520
350
334
178 73
42 57
FLUE EXHAUST
AIR INLET
COLD WATER INLET
HOT WATER OUTLET
WIRING THROUGHWAYS
GAS INLET
10
487
10
170
27
11
31
AIR INLET
AIR INLET
50
85
120
10542
60
120
10
90
3-6.5ᨴ16.5 OBLONG HOLE
2-6ᨴ13 OBLONG HOLE
4-φ13
4-φ13
40
97
40
80
37
296
139
252 GAS INLET(R3/4)
᧤VIEW FROM TOP᧥
HOT WATER
OUTLET(R3/4)
COLD WATER
INLET(R3/4)
WIRING
THROUGHWAYS
21ENB Series
17ENB Series
338
334
350
42 57
214 37
FLUE EXHAUST

Installation Manual
9
2.4 Component Details Example
(e.g. 26ENG5N)
Freeze Prevenon Heater
High Limit Switch
Heat Exchanger
Thermal Fuse
Ignion Plug
Flame Rod
Burner manifold & gas valve
Igniter
Thermistor-Cold Water
Thermistor-Hot Water
Water Flow Sensor
Fan Motor
Gas Inlet
Cold Water inlet
Hot Water outlet
Circuit board
Water Servo
Flue collar
Freeze Prevenon Heater
Freeze Prevenon Heater
Freeze Prevenon Heater
Freeze Prevenon Heater
Freeze Prevenon Heater
Water Drain Valve
Power code
Thermistor
-Low temperature detect
Status Display
26ENG series

Installation Manual
10
17/21ENB series
(e.g. 21ENB5N)
Heat exchanger
Flame rod
Burner manifold & gas valve
Circuit board
Fan motor
Gas inlet
Igniter
Main flow control valve
Hot water outlet
Cold water inlet
Flue exhaust
Anti-frost heater
Thermal fuse
Power code
Pressure relief valve
Water flow sensor
Water inlet thermistor
Anti-frost heater
Water outlet thermistor
Anti-frost heater
High limit switch
Ignition plug
Freeze protection thermostat
Inlet water filter

Installation Manual
11
3. Choosing an Installation Location
Consideration to the surroundings
• Do not install the Water Heater where the
exhaust will blow on outer walls, other walls
or material not resistant to heat. Also consider
the surrounding trees and animals.
The heat and moisture from the Water
Heater may cause discoloration of walls and
resinous materials, or corrosion of aluminium
materials.
• Do not locate the vent termination directed
towards a window or any other structure
which has glass or wired glass facing the
termination.
• Take care that noise and exhaust gas will not
affect neighbors.
• On combustible surfaces
(e.g. weatherboards), it
is not required to install
a fire proof back board.
• Install in a location
where the exhaust gas
flow will not be affected
by fans or range hoods.
Install according to regulations and manual
• The Water Heater must be installed according
to manual.
• Before installing, make sure that the vent
termination will have the proper clearances
according to AS/NZS 5601, or your local
authority.
CAUTION
NOT
CORRECT
Do not install in the following places
• A location where it is not free from obstacles
and stagnant air.
• Near staircases or emergency exits.
CAUTION
• This Water Heater is for outdoor installation
only. Do not install indoors.
• Do not enclose the termination with
corrugated metal or other materials.
This will cause carbon monoxide poisoning
and a potential fire hazard.
DANGER
Locate the appliance in an area where water
leakage from the unit or connections will not
result in damage to the area adjacent to the
appliance or to the lower floors of the structure.
When such locations cannot be avoided, it
is recommended that a suitable drain pan,
adequately drained, be installed under the
appliance. The pan must not restrict combustion
air flow.
NOTICE
• Avoid places where fires are common, such as
those where petrol, benzene and adhesives
are handled, or places in which corrosive
gases (ammonia, chlorine, sulfur, ethylene
compounds, acids) are present.
If you do not follow the above, a fire or
explosion may result causing property
damage, personal injury or death.
• Avoid installation in places where dust or
debris will accumulate. Dust may block the
air-supply opening, causing the performance
of the device fan to drop and incomplete
combustion to occur as a result.
• Avoid installation in places where special
chemical agents (e.g. hair spray or spray
detergent) are used.
Ignition failures and malfunctions may occur
as a result.
• Do not install this Water Heater in a mobile
home, recreational vehicle or on a boat as this
may be a Carbon Monoxide Poisoning Hazard.
WARNING

Installation Manual
12
Before installing, check for the following:
The location of the flue terminal must comply with the clearances shown on this page. If you are unsure
about clearances not indicated here, in general refer to AS/NZS 5601, or your local authority. In Western
Australia refer to the WA Office of Energy rules and regulations.
Flue outlet must be free from any combustible material.
WARNING
Directionof
discharge
See Note1
SeeNote1
Openinginto
abuilding
T
T
T
T
T
T
C
M
d
d
e
e
h
j
j
j
n
b
f
a
h
P
Z
k
k
g
g
I
T
Door
I = Mechanical air inlet
M = Gas meter
P = Electricity meter or fuse box
T = Flue terminal
Z = Fan-assisted appliance only
Shading indicates prohibit
ed
area for flue terminals
AS/NZS 5601.1:2013
FIGURE 6.2 (in part)
LOCATION OF FLUE TERMINALS OF BALANCED FLUE, ROOM-SEALED, FAN-ASSISTED OR OUTDOOR APPLIANCES
CLEARANCES FOR FLUE TERMINAL (front of heater)
* Unless appliance is certified for closer
installation.
† Prohibited area below electricity meter
or fuse box extends to ground level.
NOTES:
1 Where dimensions c, j or k cannot
be achieved an equivalent horizontal
distance measured diagonally from
the nearest discharge point of the
terminal to the opening may be
deemed by the Technical Regulator
to comply.
2 See Clause 6.9.4 for restrictions on a
flue terminal under a covered area.
3 See Figure J3 for clearances required
from a flue terminal to an LP Gas
cylinder. A flue terminal is considered
to be a source of ignition.
4 For appliances not addressed above
acceptance should be obtained from
the Technical Regulator.
5 Minimum clearances d and e also
apply to any combustion air intake
openings of appliances.
Ref. Item
Minimum clearances
mm
Fan assisted
a Below eaves, balconies and other projections:
Appliances up to 50 MJ/h input 200
Appliances over 50 MJ/h input 300
b From the ground, above a balcony or other surface * 300
c From a return wall or external corner * 300
d From a gas meter (M) (see Note 5)
(see Clause 5.11.5.9 for vent terminal location of regulator)
(see Table 6.7 for New Zealand requirements)
1000
e From an electricity meter or fuse box (P) † (see Note 5) 500
f From a drain pipe or soil pipe 75
g Horizontally from any building structure * or obstruction facing a terminal 500
h From any other flue terminal , cowl, or combustion air intake * 300
j Horizontally from an openable window, door, non-mechanical air inlet, or any other opening into
a building with the exception of sub-floor ventilation:
Appliances up to 150 MJ/h input* 300
Appliances over 150 MJ/h input up to 200 MJ/h input* 300
Appliances over 200 MJ/h input up to 250 MJ/h input* 500
Appliances over 250 MJ/h input* 1500
All fan-assisted flue appliances, in the direction of discharge 1500
k From a mechanical air inlet, including a spa blower 1000
n Vertically below an openable window, non-mechanical air inlet, or any other opening into a
building with the exception of sub-floor ventilation:
Space heaters up to 50 MJ/h input 150
Other appliances up to 50 MJ/h input 500
Appliances over 50 MJ/h input and up to 150 MJ/h input 1000
Appliances over 150 MJ/h input 1500
4. Installation Clearances

Installation Manual
13
5. Installation of the Water Heater
5.1 Securing the Water Heater to the
wall
• Protect your hands with gloves and take
caution to not inflict injury.
• Be careful not to hit electrical wiring, gas, or
water piping while drilling holes.
CAUTION
• Installation must conform with all local
building, water or Gas Regulations or AS/NZS
5601.
• The weight of the appliance will be applied
to the wall. If the strength of the wall is not
sufficient, reinforcement must be done to
prevent the transfer of vibration.
• Install the appliance on a vertical wall and
ensure that it is level.
• Insure no additional pressure is applied to the
pipework.
NOTICE
1. Drill a single screw hole, making sure to hit a
stud.
2. Insert and tighten the screw and hang the Water
Heater by the upper wall mounting bracket.
3. Determine the positions for the remaining four
screws (two for the top bracket and two for the
bottom), and remove the Water Heater.
Locaon of Screw Hole
Moun
ng Bracket
(upper)
Locaon of Screw Hole
4. Drill holes for the remaining four screws.
5. Hang the Water Heater again by the first screw,
and then insert and tighten the remaining four
screws.
6. Take waterproofing measures so that water does
not enter the building from screws mounting
the device.
Anchoring Screw
Do not drop or apply unnecessary force to the
appliance when installing. Internal parts may be
damaged and may become highly dangerous.
WARNING
7. Make sure the Water Heater is installed securely
so that it will not fall or move due to vibrations
or earthquakes.
If installation altitude is higher than 600 m, contact
DUX to change the altitude settings.
5.2 Elevation Adjustment Above
600 m (26ENG series only)

Installation Manual
14
Follow the instructions from the gas supplier.
Gas Type
The gas type indicated on the Water Heater’s rating
plate (NG or ULPG) must match the type of gas
being supplied to the Water Heater.
Pressure Test
The appliance and its gas connections must be leak
tested before placing the appliance in operation.
If test pressures are in excess of 1/2 psi (3.5 kPa),
the appliance must be completely disconnected
from the gas supply piping system during the test
process.
Measuring Gas Pressure
• In order to check the gas supply pressure to the
Water Heater, a tap is provided on the gas inlet.
1. Remove the hex head phillips
screw from the tap.
2. Connect a manometer using a
silicon tube.
• In order to check the gas manifold pressure
on the gas valve inside the Water Heater. The
pressure can be checked by removing the hex
head phillips screw and connecting a manometer
with a silicon tube.
Gas Meter
Select a gas meter capable of supplying the entire
MJ/h demand of all gas appliances in the building.
Gas Connection
1. Fit a union to the Water Heater gas inlet for easy
connection and removal. The thread diameter is
20 mm.
2. Fit an suitably approved isolating gas cock in the
supply pipe adjacent to the Water Heater gas
connection.
3. Ensure that the supply pipe and the gas pressure
regulator (ULPG or Natural Gas) has sufficient
flow capacity for this and other appliances
connected to the fitting pipe.
4. For ULPG appliances ensure that gas cylinders
are of sufficient size. The Water Heater alone
will require 2 × 45 Kg capacity cylinders.
5. Before connecting the appliance to the gas
service, purge any debris or air from the gas
service.
6. Check all joints for leaks with an approved leak
tester after connection.
Pressure
Ensure measurement is taken when the appliance is
operating at maximum load.
NOTE THIS DOES NOT INDICATE THE SIZE
OF THE GAS SUPPLY.
The inlet gas pressure must be within the range
specified.
This is for the purposes of input adjustment.
WARNING
Gas pressures below the required minimum
pressure may result in ignition failure, personal
injury or death.
WARNING
Pipe Sizing
• In order to choose the proper size for the gas
pipe, consult local codes and/or the AS/NZS 5601.
• Size the gas pipe according to total MJ/h demand
of the building and length from the meter or
regulator so that the following supply pressures
are available even at maximum demand refer AS/
NZS 5601:
Supply Pressure
Natural Gas ULPG Gas
Min 1.13 kPa 2.75 kPa
Max 3.00 kPa 3.50 kPa
6. Connecting the Gas Supply

Installation Manual
15
NOTE • Ensure that the gas pipe size
is correct. If undersized the
appliance will not operate
correctly.
• SERVICE CALLS ARE CHARGEABLE
FOR UNITS WITH INCORRECT
PIPE SIZES OR BLOCKED GAS OR
WATER FILTERS.
Flexible Connectors
Flexible gas pipes are not recommended unless the
minimum inside diameter is ¾ in. or greater and
the rated capacity of the connector is equal to or
greater than the MJ/h demand of the Water Heater.
Reference Tools & Sample Calculations
The tables and samples below are for reference
only. The professional sizing and installing the
gas pipe should always run the appropriate
calculations before all installations.
NOTICE
[Calculation Example]
A partial set of sizing tables are printed on page
17-18.
1. Draw a sketch of a piping system.
Enter the system information.
(e.g.)
Point of
delivery
Outlet 1
clothes dryer
80 MJ/h
Outlet 2
range/oven unit
50 MJ/h
Outlet 4
furnace 100 MJ/h
Outlet 3
water heater
150 MJ/h
2. • Determine the gas type used and supply gas
Pressure, and enter it.
• Determine the piping material and enter it to
the below.
• Select the appropriate pipe sizing table from
page 17-18 and enter it to the below.
3. • On the sketch, mark the delivery point (meter
or regulator) as “a” and the first tee as “b”. Let
the section “a-b” be the first section.
• Section from the first tee “b” to the second
tee “c” set “b-c” and set the section to the
next tee in the same way.
Gas type: Natural
Pressure drop: 0.12 kPa
Table used: 1
Piping material: Copper
Supply gas pressure: 1.13
(e.g.)
Gas type:
Pressure drop:
Table used:
Piping material:
Supply gas pressure:
(e.g.)
2 m
2 m
4 m
8 m
8 m 4 m5m
5 m
2 m
Point of
delivery
Outlet 1
clothes dryer
80 MJ/h
Outlet 2
range/oven unit
50 MJ/h
Outlet 4
furnace 100 MJ/h
Outlet 3
water heater
150 MJ/h
a
e
cb
f
h
g
d

Installation Manual
16
4. • Enter the demand which is the amount of gas
flowing through a section of pipe in the table
below.
• Enter the length for all pipe sections in the
table below.
• Round up to the lengths in the appropriate
table on page 17-18. Read across until a
capacity equal to or greater than the required
demand for the section is found. Read up to
find the size. Repeat for each section of piping.
Enter this size in the table below.
5. • Enter the input rating for each appliance in the
table below.
• Enter the length from each appliance to the
nearest tee in the outlet length in the table
below.
• Round up to the lengths in the appropriate
table on page 17-18. Read across until a
capacity equal to or greater than the required
demand for the section is found. Read up to
find the size. Repeat for each appliance. Enter
this size in the table below.
Final Check
1. Turn on and operate all gas appliances including
the Water Heater.
2. Ensure that the inlet pressure of each appliance
is above the minimum pressure required for the
appliance.
NOTE • If all appliances are not receiving
the minimum inlet pressure, the
gas piping system may need to
be changed.
• As the gas inlet size varies
depending on the area, type of
gas, piping material, etc., more
details should be determined
after confirmation according to
AS/NZS 5601.1:2013.
Section Demand Length Size
a b Outlet 1+2+3+4=
380 MJ/h 12 m 40 mm
b c Outlet 1+2=
130 MJ/h 4 m 20 mm
c d Outlet 1=
80 MJ/h 7 m 20 mm
c e Outlet 2=
50 MJ/h 5 m 20 mm
b f Outlet 3+4=
250 MJ/h 8 m 25 mm
f g Outlet 3=
150 MJ/h 2 m 20 mm
f h Outlet 4=
100 MJ/h 2 m 20 mm
Section Demand Length Size
(e.g.)
Appliance Demand Outlet
length Size
Outlet 1 80 MJ/h 7 m 20 mm
Outlet 2 50 MJ/h 5 m 20 mm
Outlet 3 150 MJ/h 2 m 20 mm
Outlet 4 100 MJ/h 2 m 20 mm
(e.g.)
Appliance Demand Outlet
length Size
Outlet 1
Outlet 2
Outlet 3
Outlet 4

Installation Manual
17
[Gas pipe sizing tables]
• These tables are for reference only. Consult gas pipe manufacturer for actual pipe capacities.
• It is an example of Copper Pipe (AS 1432 TypeB) and Natural Gas.
• Values in Table are in MJ of Gas per Hour.
1. Maximum Natural Gas Delivery Capacity (For supply pressure around 1.25 kPa) - COPPER PIPE (AS 1432 TYPE B) [MJ/h]
Pipe
Size
0.12 kPa Pressure Drop
Length (including fittings) : metres
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60
15 62 43 34 29 26 22 19 17 15 – – – – – – – – –
20 206 141 114 97 86 78 72 67 63 59 52 48 44 41 37 33 30 28
25 452 311 249 214 189 171 158 147 138 130 115 104 96 89 84 79 75 72
32 867 596 478 409 363 329 302 281 264 249 221 200 184 171 161 152 144 138
40 1459 1002 805 689 611 553 509 474 444 420 372 337 310 288 271 256 243 232
50 3356 2307 1852 1585 1405 1273 1171 1090 1022 966 856 776 713 664 623 588 559 533
65 6217 4273 3431 2937 2603 2358 2169 2018 1894 1789 1585 1436 1321 1229 1154 1090 1035 987
80 9884 6794 5455 4669 4138 3750 3450 3209 3011 2844 2521 2284 2101 1955 1834 1732 1645 1570
100 – – – – – – – – – 6286 5571 5048 4644 4320 4054 3829 3637 3469
125 – – – – – – – – – 11520 10210 9251 8511 7918 7429 7017 6665 6358
150 – – – – – – – – – 18531 16423 14881 13690 12736 11950 11288 10720 10227
2. Maximum Natural Gas Delivery Capacity (For supply pressure around 1.5-2.5 kPa) - COPPER PIPE (AS 1432 TYPE B) [MJ/h]
Pipe
Size
0.25 kPa Pressure Drop
Length (including fittings) : metres
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60
15 93 64 51 44 39 35 32 30 28 – – – – – – – – –
20 306 210 169 145 128 116 107 99 93 88 78 71 65 61 57 54 51 49
25 672 462 371 318 281 255 235 218 205 193 171 155 143 133 125 118 112 107
32 1289 886 712 609 540 489 450 419 393 371 329 298 274 255 239 226 215 205
40 2170 1491 1197 1025 908 823 757 704 661 624 553 501 461 429 403 380 361 345
50 4993 3431 2755 2358 2090 1894 1742 1621 1521 1437 1273 1154 1061 987 926 875 831 793
65 9247 6355 5104 4368 3871 3508 3227 3002 2817 2661 2358 2137 1966 1829 1716 1621 1539 1469
80 14703 10105 8115 6945 6155 5577 5131 4773 4479 4231 3750 3397 3125 2908 2728 2577 2448 2335
100 – – – – – – – – – 9350 8287 7509 6908 6426 6030 5696 5409 5161
125 – – – – – – – – – 17136 15187 13761 12660 11777 11050 10438 9914 9458
150 – – – – – – – – – 27564 24429 22135 20363 18944 17775 16790 15946 15213
3. Maximum Natural Gas Delivery Capacity (For supply pressure around 2.75-5 kPa) - COPPER PIPE (AS 1432 TYPE B) [MJ/h]
Pipe
Size
0.75 kPa Pressure Drop
Length (including fittings) : metres
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60
15 168 115 93 79 70 64 59 54 51 48 43 39 36 33 31 29 28 27
20 554 381 306 262 232 210 193 180 169 160 141 128 118 110 103 97 92 88
25 1218 837 672 575 510 462 425 396 371 351 311 281 259 241 226 214 203 193
32 2336 1606 1289 1104 978 886 815 758 712 672 596 540 497 462 433 409 389 371
40 3931 2702 2170 1857 1646 1491 1372 1276 1197 1131 1002 908 836 777 729 689 654 624
50 9046 6217 4993 4273 3787 3431 3157 2937 2755 2603 2307 2090 1923 1789 1678 1585 1506 1437
65 16754 11515 9247 7914 7014 6355 5847 5439 5104 4821 4273 3871 3562 3313 3109 2937 2789 2661
80 26639 18309 14703 12584 11153 10105 9297 8649 8110 7665 6794 6155 5663 5268 4943 4669 4435 4231
100 – – – – – – – – – 16941 15015 13604 12516 11644 10925 10320 9801 9350
125 – – – – – – – – – 31048 27517 24932 22938 21339 20022 18912 17962 17136
150 – – – – – – – – – 49941 44262 40104 36896 34324 32205 30421 28892 27564

Installation Manual
18
4. Maximum Natural Gas Delivery Capacity (For supply pressure around 5-10 kPa) - COPPER PIPE (AS 1432 TYPE B) [MJ/h]
Pipe
Size
1.5 kPa Pressure Drop
Length (including fittings) : metres
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60
15 244 168 135 115 102 93 85 79 74 – – – – – – – – –
20 807 554 445 381 338 306 281 262 246 232 206 186 171 160 150 141 134 128
25 1772 1218 978 837 742 672 619 575 540 510 452 410 377 351 329 311 295 2813
32 3399 2336 1876 1606 1423 1289 1186 1104 1035 978 867 785 723 672 631 596 566 540
40 5720 3931 3157 2702 2395 2170 1996 1857 1742 1646 1459 1322 1216 1131 1061 1002 952 908
50 13161 9046 7264 6217 5510 4993 4593 4273 4009 3787 3356 3041 2798 2603 2442 2307 2191 2090
65 24377 16754 13454 11515 10206 9247 8507 7914 7426 7014 6217 5633 5182 4821 4523 4273 4058 3871
80 38760 26639 21392 18309 16227 14703 13526 12584 11807 11153 9887 8956 8239 7665 7192 6794 6452 6155
100 – – – – – – – – – 24649 21846 19794 18210 16941 15895 15015 14260 13604
125 – – – – – – – – – 45174 40037 36276 33374 31048 29131 27517 26134 24932
150 – – – – – – – – – 72663 64400 58351 53682 49941 46858 44262 42037 40104

Installation Manual
19
7. Connecting the Water Supply
• Installation and service must be performed by a
qualified plumber.
• Observe all applicable codes.
Installation location
• If installing the Water Heater on a roof (Above
lower-level hot water supply):
If the Water Heater is installed on a roof to supply
water to the levels below, make sure that the
water pressure supplied to the Water Heater does
not drop below 199 kPa. It may be necessary to
install a pump system to ensure that the water
pressure is maintained at this level.
Check the pressure before putting the Water
Heater into operation.
If you do not supply proper pressure to the Water
Heater, noise may increase, the life of the Water
Heater will be shortened, and the Water Heater
may shut down frequently.
Potable water
• Piping and components connected to the Water
Heater shall be suitable for use with potable
water.
• Toxic chemicals, such as those used for boiler
treatment, shall not be introduced into the
potable water.
• A Water Heater used to supply potable water
may not be connected to any heating system or
components previously used with a nonpotable
water heating appliance.
Valve
When water is required in one part of the system at
a higher temperature than in the rest of the system,
means such as a mixing valve shall be installed to
temper the water to reduce the scald hazard.
7.1 Guidelines
• Use approved piping materials.
NOTE • Avoid using joints as much as
possible to keep the piping
simple.
• Avoid piping in which an air
holdup can occur.
• Avoid connection by fluid seal. It
will cause the filter to stick, that
is torn.
• Pipe and fittings must meet the installation
requirements of AS/NZS 3500.4 and local
authority regulations.
• An isolating valve must be installed on the water
inlet in close proximity to the Water Heater.
• A GATE VALVE OR BALL VALVE must be used
on the cold water inlet to the Water Heater,
THIS REQUIREMENT IS AN AUSTRALIA WIDE
REQUIREMENT UNDER THE NATIONAL PLUMBING
CODE. STOP TAPS OR COMBINATION STOP TAPS
AND NON-RETURN VALVES ARE NOT TO BE USED.
• The Water Heater needs a minimum water supply
pressure of 200 kPa to operate.
• Maximum water supply pressure must not exceed
1,000 kPa.
• If the water pressure is too high, use a Pressure
Reducing Valve and a Water Hammer Arrester.
• The unit is fitted with a pressure relief valve.
In some circumstances, there may be small
amounts of water droplets appearing from
pressure relief valve. If required pressure relief
valve should be connected to a suitable drain.
Cold water supply
No pressure reduction is required unless the
water pressure exceeds 1,000 kPa.
NOTICE
Connecting water supply
• Flush water through the pipe to clean out metal
powder, sand and dirt before connecting it.
• Use a union coupling for connecting the pipes to
reduce the force applied to the piping.

Installation Manual
20
• Pipe and fittings must meet the installation
requirements of AS/NZS 3500.4.
• Hot water lines should be lagged with suitable
insulating material.
• DO NOT FIT ANY VALVES OR RESTRICTORS TO THE
OUTLET OF THE WATER HEATER.
• DO NOT FIT ANY OBSTRUCTION TO THE
PRESSURE RELIEF LOCATED ON THE HOT WATER
OUTLET CONNECTION.
Commission Check for 50°C Temperature Delivery
A temperature check must be completed at the
nearest outlet to the Water Heater to ensure
delivered water is below 50°C.
To check the water temperature is below 50°C.
1. At the closest outlet adjust the hot water flow to
at least 5 litres/min.
2. After hot water has been running for 1 min
confirm the water temperature is below 50°C.
3. Turn the water off.
Hot water supply
For any sanitary fixture used for personal
hygiene, the delivered hot water temperature
shall not exceed 50˚C for Australia and 55˚C for
New Zealand.
For Australia, models which are not 50˚C
compliant should be fitted with a temperature
control device meeting the appropriate
plumbing code requirements.
WARNING
7.2 Freeze Prevention
Completely
insulate the
water inlet and
outlet fittings.
Do not cover the
water drain plug
with insulation.
The water in the
pipe can be drained.
Insulate the
water supply
valve completely.
Perform the following insulation measures for
prevention of freezing.
• Take appropriate heat insulation measures (e.g.
wrapping with heat insulation materials, using
heat tape, electric heaters, solenoids, or pipe
covers) according to the climate of the region
to prevent the plumbing external to the Water
Heater from freezing.
The freeze prevention heaters will not prevent
this plumbing from freezing.
• Make sure that there are no water leaks from the
cold and hot water supply lines, then insulate the
pipes completely.
• Be sure to also completely insulate the water
supply valve and the cold and hot water
connections on the Water Heater.
7.3 After Installing the water supply
piping
After purging the air from the system using the hot
water supply taps, remove the water inlet strainer
located on the cold water supply inlet connection.
Remove any debris from the filter and replace.
When replacing the filter, do not over-tighten the
Sealing.
[(50°C Compliant Models Only) Minimum
Distances]
In order to comply with AS 3498 the minimum
distances as per the diagram below must be
observed.
Cold
: 15 mm (min) L: 2 m (min)
Closest hot
water outlet