Rheem 874 Series Technical Document

Owner’s Guide and
Installation Instructions
Gas Continuous Flow Water Heater
27L Gas Water Heater — 874 & 872 Series, 627 Models
This water heater must be installed and serviced by an authorised person.
Please leave this guide with the householder.
INSTALL A RHEEMTM
www.rheem.co.nz

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.
Rheem New Zealand Pty Ltd is the supplier of the Rheem range of electronic continuous flow gas water heaters,
manufactured by Paloma Co., Ltd, a world leader in water heater technology and manufacture.
TRADEMARKS
® Registered trademark of Rheem New Zealand Pty Ltd.
™ Trademark of Rheem New Zealand 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 41.
The other pages are intended for the installer but may be of interest.
Contents....................................................................................................................................... 3
About Your Water Heater............................................................................................................ 4
Temperature Control................................................................................................................... 9
Temperature Control –Standard............................................................................................. 10
Temperature Control –Deluxe................................................................................................. 20
Save A Service Call................................................................................................................... 39
Installation –Water Heater ....................................................................................................... 42
Connections –Electrical........................................................................................................... 55
Ez-Link System Dual Installation............................................................................................. 56
Installation –Controllers .......................................................................................................... 60
Commissioning.......................................................................................................................... 67
Draining The Water Heater ....................................................................................................... 74
Water Supplies........................................................................................................................... 74
Warranty..................................................................................................................................... 75
Water Quality ............................................................................................................................. 75

4
ABOUT YOUR WATER HEATER
MODEL TYPE
The Rheem®electronic continuous flow gas water heater model you have chosen is for outdoor installation
only. This model has an extended warranty (refer to “Warranty”on page 75).
The water heater has a factory preset outlet temperature setting of:
874 series 55 C
872 series 55 C
Notes:
The 874 series water heater may be installed as an in-series gas booster water heater to a solar preheat
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 a gas booster to a solar preheater, the 874 series water heater:
Can deliver water at temperatures up to 75 C for a Premier Loline system.
During periods of low solar energy gain, will boost the water temperature automatically to a minimum
75 C when required.
The 872 and 874 series water heaters can be used on a recirculation system.
The 872 series water heater can be preset to a maximum temperature of 82˚C.
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 9 to 38). 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 gas booster
water heater when a hot tap is opened. The gas booster water heater
is for heating water at times of low solar energy gain, such as during
cloudy or rainy weather, or during winter months.
874 SERIES
Solar heated water can reach temperatures up to 75 C for a Premier Loline system. The gas booster water
heater operates automatically. When the solar heated water temperature is 58 C or higher, the flow passes
through the gas booster water heater without boosting. When the solar heated water temperature is below
58 C, the gas booster water heater operates, and heats the water to a minimum temperature of 75 C.
862 SERIES
When the gas booster is set at temperatures up to 75ºC and the water from a solar preheat is within 2ºC of
the gas booster set temperature, the incoming flow passes through the in-series gas booster without
operating. If the water heater is set at 82ºC the temperature difference before the gas booster operates
increases to 4ºC below the set temperature. (i.e. incoming water temperature is <78ºC)

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 44, 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 9).
If a controller is not installed, the water heater heats the water
to the factory preset outlet temperature setting.
The preset outlet temperature setting is:
874 series 55°C
872 series 55˚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 a Rheem Service
Centre.
If this water heater is installed as part of a solar water heater
system, the installer has checked and if required, adjusted the
preset outlet temperature setting to:
864 series 75 C
862 Series 70ºC
A tempering valve must be installed as per AS/NZS3500.4 requires you to do so.
Warning: Temperature controllers must not be fitted to this water heater (874 series) as part of a solar
water heater system. This is because the water can be supplied at a temperature much higher than the
controller temperature setting. If a solar preheater 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 and possibly higher depending upon the model of solar water heater
installed.
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.
The factory preset temperature setting of an 874 and 872 series water heaters will not deliver temperatures
exceeding 55 C. There is no requirement in AS/NZS 3500.4 to fit a temperature limiting device unless the
water heater is supplying hot water to an early childhood centre, school, nursing home or a facility for young,
aged, sick or disabled people.
maximum Kitchen controller
temperature setting 874 &
872 series
maximum recommended
supply temperature to
bathrooms and ensuites.
maximum Bathroom
controller temperature setting
874 & 872 series
Minimum Kitchen and
Bathroom controller
temperature setting
maximum temperature 862
series (82ºC)
maximum temperature 864
series (75ºC)

ABOUT YOUR WATER HEATER
6
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 an authorised or
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 an authorised person in order to avoid a
hazard. The power supply cord and plug must be replaced with a genuine replacement part available from
Rheem. Phone your nearest Rheem Service Centre to arrange for an inspection.
The warranty can become void 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.
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 7.

ABOUT YOUR WATER HEATER
7
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 (standard controller) or the ACTIVE light
(Deluxe controller), 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 8
and “Draining the Water Heater”on page 8).
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 (standard controller) or ACTIVE light (Deluxe
controller) will both glow.
The water heater will operate automatically when you open a hot tap.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on page 52. The water heater must be installed by an authorised
person. In New Zealand, the installation must comply with Standards AS/NZS 3500.4, NZS 5261 or AS/NZS
5601 and all local codes and regulatory authority requirements.
Warning: Temperature controllers must not be fitted to this water heater (874 series) as part of a solar
water heater system because water at a temperature much higher than the controller setting can be
delivered. If a solar preheater has been 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 gas booster water heater has a
minimum recommended pipe size of DN20, MUST BE of copper and be fully insulated 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 gas booster water
heater.
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 heat exchanger and fittings. If you are in a known harsh water areayou must
read page 74.If you are not sure, have your water chemistry checked against the conditions described on
page 74.

ABOUT YOUR WATER HEATER
8
HOW LONG WILL THE WATER HEATER LAST?
There are a number of factors that will affect the length of service the water heater will provide. These
include the water chemistry, the water pressure, temperature (inlet and outlet) and the water usage pattern.
However, your water heater is supported by a comprehensive warranty (refer to page 75).
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.
SERVICING
For safe and efficient operation, the water heater should be serviced annually by your nearest Rheem
Service Centre. Only genuine replacement parts should be used on this water heater.
Warning: Servicing of a gas water heater should only be carried out by authorised personnel.
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 warranty (refer to “Warranty Exclusions”on page 76).
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 (to “Draining the Water Heater”on page 74).
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 -20ºC
(including wind chill factor).
Refer to “Warranty Exclusions”on page 76.
DRAINING THE WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater”on page 73).
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.

9
TEMPERATURE CONTROL
NOTE: CONTROLLERS MUST NOT FITTED IF WATER TEMPERATURES ABOVE 55ºC ARE REQUIRED
CONTROLLERS
The Rheem 874 and 872 series can be installed with Rheem controllers to enable the user to control the
temperature of the delivered water from the outlet of the water heater. There are two families of Rheem
controllers suitable for installation with this water heater. These are the standard controllers and the Deluxe
controllers.
Standard Controllers
There are three types of standard controller. They are the Kitchen controller (Rheem PN A299850),
Bathroom1 controller (Rheem PN A299851) and the Bathroom2 controller (Rheem PN A299852). The
standard controllers are suitable for use on all 874 and 872 series water heaters.
The standard 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 standard controller.
Deluxe Controllers
There are three types of Deluxe controller. They are the Kitchen Deluxe controller (Rheem PN A299861),
Bathroom1 Deluxe controller (Rheem PN A299862) and the Bathroom2 Deluxe controller (Rheem
PN A299863).
The Deluxe controllers are identified by a „K‟ (Kitchen Deluxe controller), „B1‟ (Bathroom1 Deluxe controller)
or „B2‟ (Bathroom2 Deluxe controller), located under the front panel, to the bottom left hand corner adjacent
to the BATH FILL VOLUME label.
The Deluxe controllers offer additional functions to the standard controllers. These are:
An assistance call function, which provides a voice prompt when pressed and will sound on all
controllers. This is useful should a family member require assistance when in the bathroom.
A Bath Fill mode, which is designed to allow the water heater to deliver a selected volume of water at a
selected temperature. Bath filling takes place when the hot tap is opened. When the set volume has
been delivered, the water flow from the water heater ceases. Refer to “Bath Fill Mode” on page 30.
Note: The bath level should be monitored periodically while this function is in use to avoid the possibility
of the bath overflowing. The Bath Fill mode should also be used with caution until you are familiar with
its operation.
Warning: Baths should not be left unattended whenever young children are present.
Warning: Temperature controllers must not be fitted to this water heater (874 series) as part of a solar
water heater system. This is because the water can be supplied at a temperature much higher than the
controller temperature setting. If a solar preheater has been installed to an existing water heater installation,
then all controllers must be disconnected and removed.
Notes:
Where more than one controller is installed, the second or third controller must be of the same family.
A standard controller can only be installed with another standard controller(s) and a Deluxe controller
can only be installed with another Deluxe controller(s). A standard controller(s) and a Deluxe
controller(s) cannot be connected to the same water heater.
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 and a Bathroom2
Deluxe controller can only be installed if a Bathroom1 Deluxe controller is installed.
Other manufacturers‟ controllers are not suitable to and cannot be installed with this water heater.

10
TEMPERATURE CONTROL –STANDARD
STANDARD 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 –
Standard Controller” on page 13).
(downbutton) –The down button decreases the temperature setting (refer to “Temperature
Adjustment –Standard Controller” on page 13).
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 –
Standard Controller” on page 18).
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 –STANDARD
11
STANDARD CONTROLLER
integrity
Note: water volume button, water volume operating light and water volume symbol are on the Kitchen
controller only.
SILENCING A CONTROLLER –STANDARD
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
button
on / off
operating light
controller type
K = Kitchen
B1 = Bathroom1
B2 = Bathroom2
water volume
operating light
display panel
water volume
button
water volume
symbol
in use light
priority light

TEMPERATURE CONTROL –STANDARD
12
TEMPERATURE SETTINGS –STANDARD CONTROLLER
The temperature settings of each type of controller are:
Bathroom1 & 2 37 C to 48 C (in 1 C increments), 50 C
Kitchen 37 C to 48 C (in 1 C increments), 50 C*, 55 C
Temperature settings
37
38
39
40
41
42
43
44
45
46
47
48
50
55
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:
874 series 50ºC
872 series 50˚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:
874 series 55ºC
872 series 55˚C
Regardless of the preset outlet temperature setting of the water heater.
If controllers are not installed, the water heater defaults to the factory preset outlet temperature setting in the
first instance. This may be changed by the installer up to:
874 series 75°C
872 series 82˚C
Refer to “How Hot Should The Water Be?” on page 5.
If a building is fitted with a temperature limiting device such as a tempering valve and an 874 or 872 series
water heater is installed without a separate untempered hot water line to the kitchen, laundry or other non-
ablution area. The Kitchen controller will be able to display temperatures up to 55°C, the water leaving the
water heater will be at the preset temperature.
However, the maximum water temperature which can be delivered to the hot water outlets in these locations
is determined by the preset temperature setting of the temperature limiting device. If fitted, this is usually
55°C, however the temperature setting of the temperature limiting device will determine the outlet
temperature.
To enable the delivery of water temperatures above 55°C (e.g. when used as a Solar Booster) no controllers
can be fitted to either the 874 or 872 series. The water heater preset temperature will need to be increased
by the installer or a suitably qualified person. To supply water above 55°C to the kitchen, laundry or other
non-ablution area, a separate untempered supply must be installed from the water heater to the hot water
outlets in these locations.

TEMPERATURE CONTROL –STANDARD
13
TEMPERATURE ADJUSTMENT –STANDARD CONTROLLER
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
874 series
55°C
50°C
872 series
55°C
50°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 –STANDARD
14
KITCHEN CONTROLLER –STANDARD
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:
874 series 55ºC
872 series 55ºC
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.
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Kitchen Controller

TEMPERATURE CONTROL –STANDARD
15
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 14.
2. Turn on the Kitchen controller
Press the on / off button.
The on / off operating light and the priority light will both
glow.
The Kitchen controller temperature setting will be
displayed. This is the lower of the previous setting and:
874 series 50ºC
872 series 50˚C
3. Select the temperature setting
Press the up () button or down () button.
Refer to “Temperature Adjustment –Standard
Controller”on page 13.
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 16.
wate r
vol ume
on
off
c h e c k
h o t w a te r
t e m p e r at u r e
b e f o r e u s e
50
C
pri o rity
in use
x10l
55
C
pri orit y
in use
x10l
55
C
pri orit y
in use
x10l
55
C
pri ori ty
in use
x10l
wate r
vol ume
on
off
c h e c k
h o t w a te r
t e m p e r at u r e
b e f o r e u s e
C
pri o rity
in u se
x10l

TEMPERATURE CONTROL –STANDARD
16
BATHROOM CONTROLLERS –STANDARD
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:
874 series 50ºC
872 series 50˚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:
874 series 55ºC if a temperature limiting device is installed in the hot pipe to the
872 series bathroom, or up to 55 C if a temperature limiting device is not installed.
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:
874 series 55 C
872 series 55˚C
If a hot tap is open in another bathroom, the water will be delivered at this temperature.
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Bathroom Controller

TEMPERATURE CONTROL –STANDARD
17
c h e c k
h o t w a te r
t e m p e r at u r e
b e f o r e u s e
on
off
40
C
pri o rity
in u se
42
C
pri orit y
in use
42
C
pri orit y
in use
42
C
pri ori ty
in use
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 16.
2. Turn on the Bathroom controller
Press the on / off button.
The on / off operating light and the priority light will both
glow.
The temperature setting of 40 C will be displayed.
3. Select the temperature setting
Press the up () button or down () button.
Refer to “Temperature Adjustment –Standard Controller”
on page 13.
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 16.

TEMPERATURE CONTROL –STANDARD
18
WATER VOLUME FUNCTION –STANDARD CONTROLLER
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 19.
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.
Eg. 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.
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TEMPERATURE CONTROL –STANDARD
19
5. Turn off the alarm
Press the water volume button to turn off the alarm.
The water volume operating light goes out and 0 x10lis
displayed momentarily on the controller.
The temperature setting of the controller with priority is
then displayed.
6. Close the hot tap
If it is a Bathroom controller which is in use and has priority,
then it is advised to leave the controller on.
Refer to the warning in the notes on page 16.
If it is the Kitchen controller which is in use and has priority,
then it is advised to turn the controller off.
Refer to Important note for Bathroom controllers on
page 16.
Notes on the water volume function:
The water volume can only be set by the Kitchen controller.
The Kitchen controller does not require priority nor to be on in order to set the water volume function.
The water volume function can be set whilst a hot tap is open.
The water volume alarm will only sound from the Kitchen controller.
The water volume alarm will still sound if the Kitchen controller has been silenced (refer to “Silencing A
Controller” on page 11).
The factory preset water volume is 180 litres.
If a hot tap is not opened for one hour after the new water volume has been set, then the setting will be
automatically cancelled. The water volume resets to the previously set water volume (or the factory
preset water volume if no water volume has previously been set).
To display the remaining water volume while water is being drawn, press the water volume button. After
a few seconds, the display returns to the temperature setting.
To turn off the water volume function before the alarm sounds, press the water volume button twice.
The water volume is measured as the water flows through the water heater. Therefore if more than one
hot tap is open, the alarm will respond to the total water volume drawn from all taps and the expected
water volume from the first tap will be decreased.
If the hot tap is closed before the set water volume flows through the water heater and the water volume
button is left on, then the alarm will sound when the remaining water volume is consumed during a later
operation. To prevent the alarm from sounding, press the water volume button twice to turn it off.
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20
TEMPERATURE CONTROL –DELUXE
DELUXE CONTROLLER FUNCTIONS
If one or more Deluxe controllers are installed, at least one must be on or the bath fill function activated for
the water heater to operate. If all Deluxe controllers and the bath fill function are off, the water heater will only
deliver cold water.
ON / OFF button –The ON / OFF button must be pressed once to turn on the Deluxe controller. A Deluxe
controller cannot be turned on if water is flowing from a hot tap.
To turn off a Deluxe controller, press the ON / OFF button once. A Deluxe controller
can be turned off whilst water is flowing.
ON / OFF operating light –The light in the ON / OFF button will glow when the Deluxe controller is turned on.
The light will go out when the Deluxe controller is turned off.
ACTIVE light –The ACTIVE light will glow on a Deluxe controller when the controller is „active‟, i.e. it
has priority. The Bathroom Deluxe controller(s), if they are turned on, are „active‟ and
have priority over the Kitchen Deluxe controller.
ACTIVE or priority means that Deluxe controller has control of the water heater
temperature setting. The water temperature setting can only be adjusted by a Deluxe
controller that has priority and is displaying the ACTIVE light.
operating light –The operating light will glow on all Deluxe controllers, whether they are on or off, when
hot water is flowing, regardless of which Deluxe controller has priority.
temperature display panel –The current temperature setting is displayed in °C on all Deluxe controllers
(whether hot water is flowing or not), when any Deluxe controller is on. If all Deluxe
controllers are off, the display remains blank.
(up button) –The up button increases the water temperature setting (refer to “Temperature
Adjustment –Deluxe Controllers” on page 25).
(down button) –The down button decreases the water temperature setting (refer to “Temperature
Adjustment –Deluxe Controllers” on page 25).
assistance call button –Pressing this button sounds an alert message on all Deluxe controllers, indicating
that assistance is required in the room from which the assistance call button was
activated.
speaker –The audio of the voice prompts and chimes is emitted from the speaker.
BATH FILL button –The BATH FILL button must be pressed once to turn on the Bath Fill mode.
When the Bath Fill mode is turned on, the last selected bath fill water volume in litres
will be displayed in the bath fill water volume display panel and the last selected
bath fill temperature in °C will be displayed in the „temperature‟ display panel.
The bath fill water volume and temperature can be adjusted by using the BATH FILL
VOLUME and BATH FILL TEMPERATURE buttons located behind the hinged panel
on the lower half of the Deluxe controller (refer to “Bath-Fill Mode” on page 30).
To turn off the Bath Fill mode, press the BATH FILL button.
BATH FILL operating light –The light in the BATH FILL button will glow when the BATH FILL button is
pressed and the Bath Fill mode is turned on.
The light in the button will flash when the selected bath fill function is complete but
before the Bath Fill mode has been turned off.
The light will go out when the BATH FILL button is pressed and the Bath Fill mode is
turned off.