Rheem 874 Series User manual

TEMPERATURE CONTROL

CONTROLLERS

The Rheem 874 and 876 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 AU - Part 299850, NZ -

Part A299850), Bathroom 1 controller (Rheem AU - Part 299851, NZ - Part A299851) and the Bathroom 2

controller (Rheem AU - Part 299852, NZ - Part A299852). These part numbers include the controller cable

supplied with the controller.

The standard controllers are identified by a ‘K’ (Kitchen controller), ‘B1’ (Bathroom 1 controller) or ‘B2’

(Bathroom 2 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 AU - Part 299858,

NZ - Part A299861), Bathroom 1 Deluxe controller (Rheem AU - Part 299859, NZ - Part A299862) and the

Bathroom 2 Deluxe controller (Rheem AU - Part 299860, NZ - Part A299863). These part numbers include the

controller cable supplied with the controller.

The Deluxe controllers are identified by a ‘K’ (Kitchen Deluxe controller), ‘B1’ (Bathroom 1 Deluxe controller)

or ‘B2’ (Bathroom 2 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 function, 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.

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 function 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) 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 is 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 Bathroom 2 controller can only be installed if a Bathroom 1 controller is installed and a Bathroom 2

Deluxe controller can only be installed if a Bathroom 1 Deluxe controller is installed.

Other manufacturers’ controllers are not suitable to and cannot be installed with this water heater.

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 on / off operating light on the on / off ( ) button will glow when the controller is

priority light –

in use light –

display panel –

up () button –

turned on.

The light will go out when the controller is turned off.

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.

This light will glow on all controllers, whether they are on or off, when hot water is

flowing, regardless of which controller has priority.

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 x 10L symbol

glows when the water volume is displayed.

The up () button increases the temperature and water volume settings.

Refer to “Temperature Adjustment – Standard Controller”

down () button –The down () button decreases the temperature and water volume settings.

Refer to “Temperature Adjustment – Standard Controller” and “Water Volume

Function”.

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”.

water volume operating light –The water volume operating light on the water volume ( ) button will glow

when the water volume ( ) button is pressed and the water volume function is turned

on.

The light will go out when the water volume ( ) button is pressed and the

water volume function is turned off.

water volume symbol –The x 10L symbol below the display panel glows when the water volume function is

turned on and the water volume is displayed.

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TEMPERATURE CONTROL –STANDARD

STANDARD CONTROLLER

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 operating 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.

Rheem

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in use light

priority light

water volume

operating light

display panel

water volume

symbol

water volume

button

controller type

K = Kitchen

B1 = Bathroom 1

B2 = Bathroom 2

up ()

button

down ()

button

on / off

operating light

on / off

button

TEMPERATURE CONTROL –STANDARD

TEMPERATURE SETTINGS –STANDARD CONTROLLER

The temperature settings of each type of controller are:

Bathroom 1 & 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 50°C on an 876 series model.

** NZ –limited to 55°C.

Temperature settings

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 50°C

876 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 60°C –AU 55°C –NZ

876 series 50°C

regardless of the preset outlet temperature setting of the water heater.

If there is no controller installed, the water heater defaults to the preset outlet temperature setting. This may

be up to:

874 series 75°C

876 series 50°C

Refer to “How Hot Should The Water Be?”.

On abuilding fitted with atemperature limiting device such as atempering valve and where an 874 series

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 –STANDARD

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

60°C –AU, 55°C –NZ

50°C

876 series

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

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 60°C –AU 55°C –NZ

876 series 50°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

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TEMPERATURE CONTROL –STANDARD

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.

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 –Standard

Controller”.

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.

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TEMPERATURE CONTROL –STANDARD

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 50°C

876 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 50°C if a temperature limiting device is installed in the hot pipe to the bathroom

or up to 60°C –AU or 55°C –NZ if a temperature limiting device is not

installed.

876 series 50°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:

874 series 60°C –AU 55°C –NZ

876 series 50°C

If a hot tap is open in another bathroom, the water

will be delivered at:

For an 874 series model –up to 50°C if a

temperature limiting device is installed in the hot

pipe to the bathroom or up to 60°C –AU or 55°C

–NZ if a temperature limiting device is not

installed.

For an 876 series model –up to 50°C.

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Bathroom Controller

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TEMPERATURE CONTROL –STANDARD

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.

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 on the

temperature display panel.

3. Select the temperature setting

Press the up () button or down () button.

Refer to “Temperature Adjustment –Standard Controller”.

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).

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TEMPERATURE CONTROL –STANDARD

WATER VOLUME FUNCTION

The water volume function is designed to warn by an alarm (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 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.

To operate the water volume alarm:

1. Turn on the water volume function

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 x 10L indicator will also glow.

E.g. the factory preset water volume of 180 litres is shown

as 18 x 10L.

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 x 10L displayed) and a

minimum of 10 litres (1 and x 10L displayed) can be set

with the water volume function.

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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