AquaMAX CF20 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
CF20 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.

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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 ....................................................................................................... 54
Warranty ..................................................................................................................................... 55

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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 55).
The water heater has a maximum preset outlet temperature setting of:
CF20-60 series 70°C
CF20-50 series 48°C
Notes:
The CF20-50 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 CF20-60 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
CF20-60 model water heaters:
can deliver water at temperatures up to 75°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 75°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:
CF20-60 series 60°C
CF20-50 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 (CF20-60 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 75°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 CF20-60 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 and the preset outlet temperature setting has not been adjusted
below 55°C or if a Kitchen controller is installed, still allow hotter water to the kitchen and laundry.
A CF20-50 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
CF20-60 series
maximum recommended supply
temperature to bathrooms and
ensuites.
maximum Bathroom controller
temperature setting
CF20-60 series
maximum Kitchen and Bathroom
controller temperature setting
CF20-50 series
minimum Kitchen and Bathroom
controller temperature setting