AquaMAX CG20 Series Technical Document

This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Owner’s Guide
and
Installation Instructions
Continuous Flow
Gas Water Heater
CG20 series

PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd or Paloma Co., Ltd.
Aquamax Australia Pty Limited is the supplier of the Aquamax range of continuous flow gas water heaters,
manufactured by Paloma Co., Ltd., a world leader in water heater technology and manufacture.
TRADEMARKS
®Registered trademark of Aquamax Australia Pty Limited or Rheem Australia Pty Ltd.
™ Trademark of Aquamax Australia Pty Limited or Rheem Australia Pty Ltd.
Note: Every care has been taken to ensure accuracy in preparation of this publication.
No liability can be accepted for any consequences, which may arise as a result of its application.
Warning: Upon completion of the installation and commissioning of the water heater, leave this guide
with the householder or a responsible officer. DO NOT leave this guide inside of the cover of the water
heater, as it may interfere with the safe operation of the water heater or ignite when the water heater is
turned on.

3
CONTENTS
HOUSEHOLDER - We recommend you read pages 4 to 25.
The other pages are intended for the installer but may be of interest.
About Your Water Heater............................................................................................................ 4
Temperature Control................................................................................................................. 11
Water Supplies........................................................................................................................... 22
Save A Service Call................................................................................................................... 23
Installation –Water Heater ....................................................................................................... 26
Connections –Plumbing .......................................................................................................... 37
Connections –Electrical........................................................................................................... 39
Installation –Controllers .......................................................................................................... 40
Commissioning.......................................................................................................................... 46
Draining The Water Heater ....................................................................................................... 56
Warranty..................................................................................................................................... 59

4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
The Aquamax®continuous flow gas water heater model you have chosen is for outdoor installation only. This
model has an extended manufacturer‟s warranty (refer to the Aquamax warranty on page 59).
The water heater has a maximum preset outlet temperature setting of:
CG20-60 series 70°C
CG20-50 series 48°C
Notes:
The CG20-50 model water heaters are marked “THIS APPLIANCE DELIVERS WATER NOT
EXCEEDING 50°C IN ACCORDANCE WITH AS 3498” on the front panel. These models;
must not be installed as an in-series gas booster to a solar water
heater, as water temperature greater than 50°C can be delivered
from the water heater contravening its compliance to AS 3498.
The CG20-60 model water heaters may be installed as an in-series
gas booster to a solar water heater. For information relating to the
function and operation of the solar water heater, refer to the Owner‟s
Guide and Installation Instructions supplied with the solar water
heater.
When installed as an in-series gas booster to a solar water heater, the
CG20-60 model water heaters:
can deliver water at temperatures up to 70°C to 80°C with an
Aquamax pumped direct solar system.
during periods of low solar energy gain, will boost the water
temperature automatically to its preset outlet temperature setting.
WATER HEATER OPERATION
The water heater operates automatically, heating water as it passes through the water heater. When a hot
tap is opened, the gas burners ignite to provide immediate heating of the water. The heat produced by the
burner is transferred to the water through the heat exchanger. The water is heated to a constant temperature
by the automatic adjustment of the gas supply to the burner to suit the water flow rate (refer to “Temperature
Control” on pages 11 to 21). The gas burners extinguish when the hot tap is closed.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
GAS BOOSTING FOR A SOLAR WATER HEATER
Water stored in the solar storage tank passes through the in-series gas booster when a hot tap is opened.
The in-series gas booster is for heating water at times of low solar energy gain, such as during cloudy or
rainy weather, or during colder months.
Solar heated water can reach temperatures up to 70°C to 80°C for an Aquamax pumped direct solar system.
The in-series gas booster operates automatically. When the solar heated water temperature is 58°C or
higher, the flow passes through the in-series gas booster without boosting. When the solar heated water
temperature is below 58°C, the in-series gas booster heats the water to its preset outlet temperature setting.

ABOUT YOUR WATER HEATER
5
MAINS PRESSURE
The water heater is designed for direct connection to the mains water supply. If the mains supply pressure in
your area exceeds that shown on page 28, a pressure limiting valve must be fitted. The supply pressure
should be greater than 140 kPa for the rated flow and performance to be achieved.
HOW HOT SHOULD THE WATER BE?
The water heater may be installed with one or more user
adjustable temperature controllers, which allow you to
choose the most suitable temperature for your hot water
needs (refer to “Temperature Control” on page 11).
If a controller is not installed, the water heater heats the
water to the preset outlet temperature setting. The factory
preset outlet temperature setting is:
CG20-60 series 60°C
CG20-50 series 48°C
Note: The preset outlet temperature setting of this water
heater cannot be adjusted by the householder. The setting
can only be adjusted by the installer or Aquamax Service.
Note:AS 3498 requires that a water heater provides the
means to inhibit the growth of Legionella bacteria in potable
water. When this water heater is used as an in-series booster
for a solar water heater it can satisfy this AS 3498
requirement provided it is energised, the booster preset outlet
temperature setting is 70°C, and that a remote temperature
controller is not used.
Warning: Temperature controllers must not be fitted to this water heater (CG20-60 model) if it is
installed as an in-series gas booster with a solar water heater system because water at a temperature much
higher than the controller setting can be delivered. If a solar water heater has been installed to an existing
water heater installation, then all controllers must be disconnected and removed.
If this water heater is installed as part of a solar water heater system, the system can deliver water at
temperatures from 58°C up to 80°C with an Aquamax pumped direct solar water heater.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can cause scalding. Check the water temperature
before use, such as when entering a shower or filling a bath or basin, to ensure it is suitable for the
application and will not cause scald injury.
We recommend and it may be required by regulations that an approved temperature limiting device be fitted
into the hot water piping to the bathroom and ensuite when a CG20-60 model water heater is installed. This
will keep the water temperature below 50°C at the bathroom and ensuite. The risk of scald injury will be
reduced and if no controllers are installed or if a Kitchen controller is installed, still allow hotter water to the
kitchen and laundry.
A CG20-50 model water heater will not deliver temperatures exceeding 50°C, in accordance with AS 3498.
There is no requirement in AS/NZS 3500.4 to fit a temperature limiting device if this water heater is installed
in other than an early childhood centre, school, nursing home or a facility for young, aged, sick or disabled
people.
maximum Kitchen controller
temperature setting
CG20-60 series
maximum recommended supply
temperature to bathrooms and
ensuites.
maximum Bathroom controller
temperature setting
CG20-60 series
maximum Kitchen and Bathroom
controller temperature setting
CG20-50 series
minimum Kitchen and Bathroom
controller temperature setting

ABOUT YOUR WATER HEATER
6
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
A CG20-60 model continuous flow water heater can be installed as part of a circulated hot water flow and
return system in a building.
Notes:
the preset outlet temperature setting of the water heater must be set to at least 60°C.
Water should not be circulated from a water heater with a temperature setting of less than 60°C.
the preset outlet temperature setting of the water heater should be set to 70°C if the water temperature
decreases by more than 5°C through a circulated hot water flow and return system due to heat loss in
the ring main.
temperature controllers should not be installed with this water heater as part of a circulated hot water
flow and return system.
WARNING
This water heater is only intended to be operated by persons who have the experience or the knowledge and
the capabilities to do so. This water heater is not intended to be operated by persons with reduced physical,
sensory or mental capabilities i.e. the infirm, or by children. Children should be supervised to ensure they do
not interfere with the water heater.
The water heater uses 240 Volt AC electrical power for operation of the control systems and the combustion
fan. The removal of the front panel will expose 240 V wiring. It must only be removed by a qualified person.
The power lead from the water heater must be plugged into a weatherproof electrical outlet. Take care not to
touch the power plug with wet hands.
SAFETY
This water heater is supplied with temperature sensors, a FlameSafe™ protection system and a pressure
relief valve. These devices must not be tampered with or removed. The water heater must not be operated
unless each of these devices is fitted and is in working order.
If the power supply cord or plug is damaged, it must be replaced by a qualified person in order to avoid a
hazard. The power supply cord and plug must be replaced with a genuine replacement part available from
Aquamax. Phone Aquamax Service to arrange for an inspection.
Warning: For continued safety of this water heater it must be installed, operated and maintained in
accordance with the Owner‟s Guide and Installation Instructions.
The Aquamax warranty may not cover faults if relief valves or other safety devices are tampered with
or if the installation is not in accordance with these instructions.
Do not store flammable or combustible materials near
the water heater. Flammable liquids (such as petrol),
newspapers and similar articles must be kept well away
from the water heater and the flue terminal.
Do not use aerosols, stain removers and household
chemicals near the water heater whilst it is working. Gases
from some aerosol sprays, stain removers and household
chemicals become corrosive when drawn into a flame.
Do not store swimming pool chemicals, household
cleaners, etc., near the water heater.
Do not place anything on top of the water heater or in
contact with the flue terminal. Ensure the flue terminal is not
obstructed in any way at any time.
Do not use Propane / Butane gas mixtures in a Propane model. A Propane model is designed to operate
on Propane only. The use of Propane / Butane mixture, such as automotive LPG fuel, in a Propane
model is unsafe and can cause damage to the water heater.

ABOUT YOUR WATER HEATER
7
PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed over a safe tray. Construction, installation and draining of a safe tray must comply with
AS/NZS 3500.4 and all local codes and regulatory authority requirements.
The water heater must be maintained in accordance with the Owner‟s Guide and Installation Instructions.
Refer to “General Maintenance” on page 7, “Minor Six Month Maintenance” on page 7 and “Major Five Year
Service” on page 7.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back up redundancy within the hot water system design. This
should ensure the continuity of hot water supply in the event that this water heater were to become
inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs
and building back up redundancy into your hot water supply system.
GENERAL MAINTENANCE
The jacket of the water heater can be cleaned with a soft cloth and warm mild soapy water. Under no
circumstances should abrasive materials or powders be used.
The area around the water heater can be sprayed with insecticide to rid the area of insects. Insects
encroaching into or nesting in the water heater can interfere with the operation of the water heater and also
damage components.
MINOR SIX MONTH MAINTENANCE
It is recommended minor maintenance be performed every six months by the dwelling occupant.
The minor maintenance includes:
Inspect around the air inlet, flue terminal and the water heater in general for plant growth.
Trim back any shrubs, bushes or other plants which have encroached around the water heater.
Plant growth across the air inlet and flue terminal can interfere with the performance of the water
heater.
Inspect around the water heater for insect infestations, such as ants.
Spray insecticide around the water heater if necessary to rid the area of insects. Do not spray the
surface or into the air inlet or flue terminal of the water heater.
Insects encroaching into or nesting in the water heater can interfere with the operation of the water
heater and also damage components.
Check the drain line from the safe tray (if one is installed) is not blocked.
MAJOR FIVE YEAR SERVICE
For safe and efficient operation, it is recommended a five year service be conducted on the water heater.
Warning: Servicing of a water heater must only be carried out by qualified personnel. Phone Aquamax
Service.
Note: The five year service and routine replacement of any components, if required, are not included in the
Aquamax warranty. A charge will be made for this work. Only genuine replacement parts should be used on
this water heater.
The five year service includes the following actions:
Check and if necessary adjust the gas pressure.
Check the operation of and clean the burner.
Visually check the unit for any potential problems.
Inspect all connections.
Check the drain line from the safe tray (if one is installed) is not blocked.

ABOUT YOUR WATER HEATER
8
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
Turn off the controllers(s) (if fitted) by pressing the on / off button.
The light in the on / off button will go out and the priority light, if it is on, will go out.
Switch off the electrical supply at the power outlet to the water heater if there is no risk of freezing
conditions occurring (refer to note below).
Close the gas isolation valve at the inlet to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off unless the water heater is drained, otherwise damage could result (refer to “Frost Protection”on page 9
and “Draining the Water Heater”on page 9).
TO TURN ON THE WATER HEATER
Screw in the drain plugs at the cold water inlet and hot water outlet of the water heater if the water
heater has been drained.
Open all of the hot taps in the house (don‟t forget the shower).
Open the cold water isolation valve fully at the inlet to the water heater.
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Open the gas isolation valve fully at the inlet to the water heater.
Plug in the power supply cord at the power outlet.
Switch on the electrical supply at the power outlet to the water heater.
Turn on a controller, if one is fitted, by pressing the on / off button.
The light in the on / off button and the priority light will both glow.
The water heater will operate automatically when you open a hot tap.
GOING ON HOLIDAYS
If you are going on holidays, it is not necessary to turn the water heater off. If it is necessary to turn off the
water heater, refer to “To Turn Off The Water Heater” on page 8.

ABOUT YOUR WATER HEATER
9
FROST PROTECTION
The water heater has a frost protection system. The frost protection system will protect the water heater from
damage, by preventing ice forming in the waterways of the water heater, in the event of freezing conditions
occurring.
Notes:
The frost protection system will be rendered inoperable if electrical power is not available at the water
heater. Damage caused by freezing due to the unavailability of power at the water heater is not covered
by the Aquamax warranty (refer to “Terms of the Aquamax Warranty” on page 59).
If it is necessary to switch the power off to the water heater and there is a risk of freezing, then it is
necessary to drain the water heater (refer to “Draining the Water Heater” on page 9).
Pipe work to and from the water heater must be adequately insulated to prevent freezing.
The water heater is not suitable for installation in areas where the ambient temperature falls below -20°C
(including wind chill factor).
Refer to “Terms of the Aquamax Warranty” on page 59.
DRAINING THE WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater” on page 8).
Open a hot tap (preferably the shower outlet).
Unscrew the two drain plugs, one each at the cold water inlet and hot water outlet, on the underside of
the water heater.
Water will drain from the water heater.
When water stops flowing from the water heater, close the hot tap.
Note: It is recommended not to screw the drain plugs back in, until the water heater is to be turned on again.

ABOUT YOUR WATER HEATER
10
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 26 to 36. The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS 5601 or AS/NZS 5601.1, as applicable under local
regulations, and all local codes and regulatory authority requirements.
Warning: Temperature controllers must not be fitted to this water heater (CG20-60 model) if it is
installed as an in-series gas booster with a solar water heater because water at a temperature much higher
than the controller setting can be delivered. If a solar water heater is installed to an existing water heater
installation, then all controllers must be disconnected and removed.
The pipe work between the solar storage tank (if one is installed) and the in-series gas booster has a
minimum recommended pipe size of DN20, MUST BE of copper and be fully insulated with a closed cell type
insulation or equivalent in accordance with the requirements of AS/NZS 3500.4. The insulation must be
weatherproof and UV resistant if exposed. The insulation must be fitted up to the connections on both the
solar storage tank and the in-series gas booster.
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Plumbing Industry Commission. This water heater must be
installed by a licensed person as required by the Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that the work complies with all the
relevant Standards. Only a licensed person will have insurance protecting their workmanship for 6 years.
Make sure you use a licensed person to install this water heater and ask for your Compliance Certificate.
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER?
The water heater is suitable for most public water supplies, however some water chemistries may have
detrimental effects on the water heater, its components and fittings. Refer to “Water Supplies” on page 22.
If you are in a known harsh water area or you are not sure of your water chemistry, have your water checked
against the conditions described on page 22.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer‟s warranty (refer to page 59). There are a number of
factors that will affect the length of service the water heater will provide. These include but are not limited to
the water chemistry, the water pressure, the water temperature (inlet and outlet) and the water usage
pattern. Refer to “Precautions” on page 7.

11
TEMPERATURE CONTROL
CONTROLLERS
The Aquamax CG20 series of continuous flow water heaters can be installed with Aquamax controllers to
enable the user to control the temperature of the delivered water from the outlet of the water heater.
There are three types of controller. They are the Kitchen controller (PN AQ3264101, including cable),
Bathroom1 controller (PN AQ3264102, including cable) and the Bathroom2 controller (PN AQ3264103,
including cable).
The controllers are identified by a „K‟ (Kitchen controller), „B1‟ (Bathroom1 controller) or „B2‟ (Bathroom2
controller) located on the front bottom left hand corner of the controller.
Warning: Temperature controllers must not be fitted to this water heater (CG20-60 model) if it is
installed as an in-series gas booster with a solar water heater because water at a temperature much higher
than the controller setting can be delivered. If a solar water heater is installed to an existing water heater
installation, then all controllers must be disconnected and removed.
Notes:
One, two or three controllers can be installed. Only one of each type of controller can be connected to
the water heater. Therefore, a maximum of three controllers only can be connected to each water
heater.
A Bathroom2 controller can only be installed if a Bathroom1 controller is installed.
Other manufacturers‟ controllers are not suitable to and cannot be installed with this water heater.

TEMPERATURE CONTROL
12
CONTROLLER FUNCTIONS
If one or more controllers are installed, at least one must be on for the water heater to operate. If all
controllers are off, the water heater will only deliver cold water.
on / off button –This button must be pressed once to turn on the controller.
A controller cannot be turned on if water is flowing from a hot tap.
To turn off a controller, press the on / off button once. The light will go out.
A controller can be turned off whilst water is flowing.
on / off operating light –The light in the on / off button will glow when the controller is turned on.
The light will go out when the controller is turned off.
priority light –This light will glow on a controller when that controller has priority.
The Bathroom controller(s), if they are turned on, have priority over the Kitchen
controller.
Priority means that controller has control of the water heater temperature setting.
The water temperature setting can only be adjusted by the controller that has priority.
in use light –This light will glow on all controllers, whether they are on or off, when hot water is
flowing, regardless of which controller has priority.
display panel –The current temperature setting is displayed on all controllers (whether hot water is
flowing or not), when any controller is on.
If all controllers are off, then the display remains blank.
The water volume can also be displayed on the Kitchen controller. The x10lsymbol
glows when the water volume is displayed.
(up button) –The up button increases the temperature setting.
Refer to “Temperature Adjustment” on page 15.
(down button) –The down button decreases the temperature setting
Refer to “Temperature Adjustment” on page 15.
water volume button (Kitchen controller only) –This feature enables an alarm to sound when a set volume
of water has flowed through the water heater
Refer to “Water Volume Function” on page 20.
water volume operating light –The light in the water volume button will glow when the water volume button
is pressed and the water volume mode is turned on.
The light will go out when the water volume button is pressed and the water volume
mode is turned off.
water volume symbol –The x10lsymbol below the display panel glows when the water volume mode is
turned on and the water volume is displayed.

TEMPERATURE CONTROL
13
CONTROLLER
Note: water volume button, water volume operating light and water volume symbol are on the Kitchen
controller only.
SILENCING A CONTROLLER
The controller emits a sound whenever a button is pressed. This sound can be turned off to provide silent
operation.
To turn off the sound:
Press the on / off button, to deactivate the controller (on / off light is off).
Press and hold the up () button.
Press the on / off button, whilst the up () button is pressed.
The sound for the controller is deactivated. Repeat this procedure on the other controllers if you wish to
deactivate their sound. To restore the sound, repeat this procedure.
up
button
down
button
on / off
operating light
on / off
button
display panel
water volume
operating light
controller type
K = Kitchen
B1 = Bathroom1
B2 = Bathroom2
water volume
button
water volume
symbol
in use light
priority light

TEMPERATURE CONTROL
14
TEMPERATURE SETTINGS
The temperature settings of each type of controller are:
Bathroom1 & 2 37°C to 46°C (in 1°C increments), 48°C*, 50°C
Kitchen 37°C to 46°C (in 1°C increments), 48°C*, 50°C, 55°C, 60°C
* limited to 48°C on a CG20-50 model.
Temperature settings
37
38
39
40
41
42
43
44
45
46
48
50
55
60
warm
average hot shower
hot
very hot
The installation of a Bathroom controller(s) only (i.e. no Kitchen controller) limits the temperature setting of
the water heater to a maximum of:
CG20-60 series 50°C
CG20-50 series 48°C
regardless of the preset outlet temperature setting of the water heater.
The installation of a Kitchen controller will allow a maximum temperature setting of:
CG20-60 series 60°C
CG20-50 series 48°C
regardless of the preset outlet temperature setting of the water heater.
If controllers are not installed, the water heater defaults to the preset outlet temperature setting. This may be
up to:
CG20-60 series 70°C
CG20-50 series 48°C
Refer to “How Hot Should The Water Be?” on page 5.
On a building fitted with a temperature limiting device such as a tempering valve and where a CG20-60
model water heater is installed without a separate untempered hot water line to the kitchen, laundry or other
non-ablution area, although the Kitchen controller will be able to display temperatures above 50°C and the
water leaving the water heater will be at the set temperature, the maximum water temperature which can be
delivered to the hot water outlets in these locations is determined by the temperature setting of the
temperature limiting device. This is usually 50°C.
On a building fitted with a temperature limiting device set to 50°C, to enable the delivery of water
temperatures above 50°C to the kitchen, laundry or other non-ablution area, separate untempered pipe work
must be installed from the water heater to the hot water outlets in these locations.

TEMPERATURE CONTROL
15
TEMPERATURE ADJUSTMENT
A controller must be on and have priority to be able to adjust the temperature setting.
The temperature adjustment is made by pressing the up () button or down () button.
The maximum temperature setting for the controllers are:
Kitchen
Bathroom
CG20-60 series
60°C
50°C
CG20-50 series
48°C
48°C
Each press of the up () button will increase the temperature setting by one increment.
Pressing and holding the up () button will scroll the temperature setting up to a maximum 43°C if there
is hot water flowing or 45°C if there is no hot water flowing.
From the 45°C setting, the up () button must be pressed once for each increase in temperature
increment.
The temperature setting cannot be increased above 43°C whilst hot water is flowing.
The minimum temperature setting for each type of controller is 37°C.
Each press of the down () button will decrease the temperature setting by one temperature increment.
Pressing and holding the down () button will scroll down the temperature setting.
The temperature setting can be decreased from any temperature setting whether the hot water is flowing
or not.

TEMPERATURE CONTROL
16
KITCHEN CONTROLLER
The Kitchen controller allows the user to select the temperature setting for the hot water to be used in the
kitchen and laundry. It has a minimum temperature setting of 37°C and a maximum temperature setting of:
CG20-60 series 60°C
CG20-50 series 48°C
The Kitchen controller does not have priority if a Bathroom controller is on.
Notes on the Kitchen controller:
The controller cannot be turned on whilst a hot tap is open.
The Kitchen controller must be on and have priority in order to adjust the temperature setting on the
Kitchen controller.
The Bathroom controller(s) can be turned off from the Kitchen controller.
Press and hold the on / off button on the Kitchen controller for three seconds.
This turns off all the controllers and the displays go blank.
If hot water is flowing from a hot tap, it will go cold.
Kitchen Controller

TEMPERATURE CONTROL
17
To operate the Kitchen controller:
1. Turn off the Bathroom controller(s)
If a temperature setting is displayed and the priority light is not glowing, it is necessary to turn off the
Bathroom controller(s) to gain priority.
Refer to the notes on the Kitchen controller on page 16.
2. Turn on the Kitchen controller
Press the on / off button.
The on / off operating light and the priority light will both
glow.
The previous Kitchen controller temperature setting will
be displayed on the temperature display panel.
3. Select the temperature setting
Press the up () button or down () button.
Refer to “Temperature Adjustment” on page 15.
The selected temperature setting will be displayed on
all controllers.
4. Open the hot tap.
The in use light will glow on all controllers.
5. Close the hot tap.
The in use light will go out on all controllers, if no other
hot tap is open.
6. Turn off the Kitchen controller
Press the on / off button.
The priority light and on / off operating light will go out
and the temperature display will go blank.
Important: Turn off the Kitchen controller after hot water usage
is finished in the kitchen and / or laundry. Refer to Important
note for Bathroom controllers on page 18.
wa te r
vo lum e
on
of f
c h e c k
h o t w a t e r
t e m p e r at u r e
b e f o r e u s e
50
C
pr io rit y
in us e
x10l
55
C
pr iorit y
in u s e
x10l
55
C
pr iorit y
in u s e
x10l
55
C
pr ior ity
in us e
x10l
wa te r
vo lum e
on
of f
c h e c k
h o t w a t e r
t e m p e r a tu r e
b e f o r e u s e
C
pr io rity
in u s e
x10l

TEMPERATURE CONTROL
18
BATHROOM CONTROLLERS
The Bathroom controller(s) allows the user to select the temperature setting for the hot water to be used in
the bathroom. They have a minimum temperature setting of 37°C and a maximum temperature setting of:
CG20-60 series 50°C
CG20-50 series 48°C
The Bathroom controllers operate in tandem. Whenever an operation is selected on one Bathroom controller,
it is also set on the other Bathroom controller. The Bathroom controllers automatically have priority if they are
on.
Important: It is important to turn on the Bathroom controller before opening a hot tap in the bathroom
(priority is automatically gained). If the Bathroom controller is not on and the Kitchen controller is on (has
priority), then it is possible to receive water at a temperature higher than expected from a hot tap in the
bathroom. This temperature could be up to:
CG20-60 series 50°C if a temperature limiting device is installed in the hot pipe to the
bathroom or up to 60°C if a temperature limiting device is not installed.
CG20-50 series 48°C
Notes on the Bathroom controllers:
The controller cannot be turned on whilst a hot tap is open.
When a Bathroom controller is turned on, it gains priority from the Kitchen controller.
The Bathroom controller must be on in order to adjust the temperature setting on the Bathroom
controller.
The Kitchen controller can be turned off from a Bathroom controller.
Press and hold the on / off button on a Bathroom controller for three seconds.
This turns off all the controllers and the displays go blank.
If hot water is flowing from a hot tap, it will go cold.
Warning: It is advised to leave the Bathroom controller on after hot water usage is finished in the
bathroom. Turning off a controller in one bathroom will also turn off the controller in the other
bathroom. The Kitchen controller will gain priority if it is on and the temperature setting can be up to:
CG20-60 series 60°C
CG20-50 series 48°C
If a hot tap is open in another bathroom, the water will be delivered at this temperature.
Bathroom Controller

TEMPERATURE CONTROL
19
c h e c k
h o t w a t e r
t e m p e r at u r e
b e f o r e u s e
on
of f
40
C
pr io rit y
in u s e
42
C
pr iorit y
in u s e
42
C
pr iorit y
in u s e
42
C
pr iority
in us e
To operate a Bathroom controller:
1. Turn off the Kitchen controller
If a temperature setting is displayed and the priority light is not glowing, it is advised to turn off the
Kitchen controller.
Refer to the notes on the Bathroom controllers on page 18.
2. Turn on the Bathroom controller
Press the on / off button.
The on / off operating light and the priority light will both
glow.
The previous Bathroom controller temperature setting will
be displayed on the temperature display panel.
3. Select the temperature setting
Press the up () button or down () button.
Refer to “Temperature Adjustment” on page 15.
The selected temperature setting will be displayed on all
controllers.
4. Open the hot tap
The in use light will glow on all controllers.
5. Close the hot tap
The in use light will go out on all controllers, if no other
hot tap is open.
It is advised not to turn off the Bathroom controller(s).
Refer to the warning in the notes on page 18.

TEMPERATURE CONTROL
20
WATER VOLUME FUNCTION
The water volume function is designed to warn, by a beeping sound, that a certain volume of water has been
delivered from the water heater. It does not stop either the flow of or the heating of water. This function
is particularly useful if a bath is being filled, or measuring the water consumed by the use of a shower.
The water volume function can only be set by the Kitchen controller. Refer to the notes on the water volume
function on page 21.
To operate the water volume alarm:
1. Turn on the water volume alarm
Press the water volume button.
The water volume operating light will glow.
The current set water volume (in litres divided by 10) will
be displayed and the x10lindicator will also glow.
E.g. the factory preset water volume of 180 litres is
shown as 18 x10l.
2. Adjust the water volume setting (if necessary)
To adjust the water volume setting, press the
up () button to increase the water volume or the
down () button to decrease the water volume.
Each press of the up () button or down () button will
change the water volume setting by 10 litres.
Pressing the up () button or down () button
continuously will scroll the water volume setting.
Fifteen seconds after the water volume has been
selected, the water volume operating light will start to
flash and the selected water volume is set.
The water volume operating light will continue to flash
until the alarm sounds.
A maximum of 500 litres (50 and x10ldisplayed) and a
minimum of 10 litres (1 and x10ldisplayed) can be set
with the water volume alarm.
3. Set the water temperature
Turn on the controller for the room where the hot water
is to be used.
Gain priority (if using the Kitchen controller).
Select the temperature setting.
4. Open the hot tap
The in use light will glow on all controllers.
Measurement of the water flow at the water heater will
commence when a hot tap is open and the water volume
operating light is flashing.
The alarm will sound when the set volume of water has
passed through the water heater.
wa te r
vo lum e
on
of f
c h e c k
h o t w a t e r
t e m p e r at u r e
b e f o r e u s e
18
C
pr io rit y
in us e
x10l
wa te r
vo lum e
on
of f
c h e c k
h o t w a t e r
t e m p e r at u r e
b e f o r e u s e
15
C
pr io rit y
in us e
x10l
on
of f
c h e c k
h o t w a t e r
t e m p e r at u r e
b e f o r e u s e
42
C
pr io rit y
in us e
42
C
pr iorit y
in u se
wate r
vo lume