Rheem 743 series, 7431 Series Owner's Manual And Installation Instructions

This water heater must be installed and serviced by an authorised person.

Please leave this guide with the householder.

Owner’s Guide

and

Installation Instructions

Electric

743 & 7431 Series Boiling Water Unit

Models 3 & 5 litre

*Model shown 743005F – Filtered model

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

Australia Only

Notice to Victorian Customers from the

Victorian Plumbing Industry Commission.

This boiling unit 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 under bench pumped water chiller and ask
for your Compliance Certificate.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

CONTENTS

About your boiling water unit .................................. 4

Operating the tap .................................................. 14

Changing the water filter ....................................... 15

Save a service call................................................ 16

Installation…………………………………………....18

Electrical connection ............................................. 24

Commissioning ..................................................... 25

Draining the boiling water unit .............................. 25

Water supplies ...................................................... 26

End of life water heater disposal .......................... 27

Rheem warranty ................................................... 30

OWNER – We recommend reading pages 4 to 17.

The other pages are intended for the installer but may be of interest.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

ABOUT YOUR BOILING WATER UNIT

INTRODUCTION

Thank you for choosing our Rheem 743/7431 Series Boiling Water Unit. Please take
a few minutes to read this booklet because it contains important information about
the correct installation and operation of your Rheem Boiling Water Unit.

The Rheem Boiling Water Unit supplies both boiling water and cold water (both
supplies filtered). The tank is made from high quality copper and is designed to be
installed indoors, under sinks and in cupboards. The Rheem Boiling Water Unit is
supplied with all the required safety valving for installation (not including the isolation
valve prior to the water heater). Your Rheem Boiling Water Unit is designed to supply
boiling water to the Rheem Boiling Water Dispensing Tap. As an option, your Rheem
Boiling Water Unit can also be combined with a Rheem Water Chiller for filtered
chilled water.

WARNING

This boiling water unit is only intended to be operated by persons who have the
experience or the knowledge and the capabilities to do so. This boiling water unit 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 boiling water unit. Rheem recommend the use of the
safety function allowing only two finger operation (see page 14).

This boiling water unit uses 230-240V AC electrical power for operation of the control
systems and the electrically operated components. The removal of the jacket will
expose 230-240V wiring. The jacket must only be removed by an authorised or
qualified person.

HOW HOT SHOULD THE WATER BE?

The system controls will operate to maintain a default water temperature of near
boiling point within the boiling unit. This can be adjusted from 70-99°C.

SAFETY

The Rheem Boiling Water Unit is supplied with over temperature cut-outs on the
water heating element to prevent element burn out in the event of control failure.

The Rheem Boiling Water Unit is constructed with an integral safe tray with automatic
shut off device that complies with ATS 5200.476. A safe tray and/ or safe waste are
not required for installation.

If the electrical supply cord to the water heater is damaged, it must be replaced by an
authorised person in order to avoid becoming a hazard. Phone your nearest Rheem
Service Department or Rheem Service Centre to arrange for an inspection.
For extra electrical protection against power surges and spikes it is recommended
that a surge protector is installed prior to the boiling water unit.

WARNING:

The Rheem warranty may not cover faults if any of the installed safety devices
are tampered with.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

HOW YOUR BOILING WATER UNIT WORKS

TO TURN OFF THE BOILING WATER UNIT

The boiling water unit is supplied with a programmable timer. We recommend the
timer is used to conserve energy.

If it is necessary to turn off the boiling water unit:

 Switch off the electrical supply at the isolating switch to the boiling water unit.
 Close the cold water isolation valve on the supply to the boiling water unit.

TO TURN ON THE BOILING WATER UNIT

 Open the cold water isolation valve fully on the cold water supply to the boiling

water unit.

 Switch on the electrical supply at the isolating switch to the boiling water unit.

Note: The boiling water unit may not appear to turn on immediately when it is first switched

on, as the electronic controller will automatically check the system prior to allowing
water into the boiling water unit (this could take up to 10 seconds).

On initial start up, this boiling water unit automatically runs through a set-up cycle to
detect the boiling point of water. During this cycle, steam will discharge from the vent
pipe several times for a short time. This set-up cycle will take up to 18 minutes, and
when completed (once boiling point is determined) the unit will commence
incremental filling. It is important NOT to operate the tap during the set-up cycle
because it may affect the operating temperature of the unit.

IS THIS BOILING WATER UNIT INSTALLED CORRECTLY?

Installation requirements are shown under Installation (on page 19).
The boiling water unit must be installed:

 by a qualified person, and
 in accordance with the installation instructions, and
 in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local

codes and regulatory authority requirements.

In New Zealand, the installation must also conform to Clause G12 of the New Zealand Building Code

DOES THE WATER QUALITY AFFECT THE BOILING WATER UNIT?

The boiling water unit is suitable for most public water supplies, however some water
qualities may have detrimental effects on the boiling water unit and fittings. If you are
in a known bad water area you must first read Water Supplies on page 26. If you
are not sure, have your water quality checked against the conditions described on
page 26.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

HOW YOUR BOILING WATER UNIT WORKS

HOW LONG WILL THE BOILING WATER UNIT LAST?

There are a number of factors that will affect the length of service the boiling water
unit will provide. These include the water quality, the water usage pattern etc.
However, your boiling water unit is supported by a comprehensive warranty (refer
“Warranty” on page 30). The boiling water unit is designed to operate using mains
water pressure by connecting directly to the mains water supply. If the mains supply
pressure in your area exceeds 1000kPa a secondary pressure limiting valve must be
fitted. The water supply pressure is recommended to be greater than 350kPa for the
Rheem boiling water unit’s optimum performance. Water pressure lower than 350kPa
will reduce the performance of the boiling water unit (and water chiller if installed). A
supply pressure as low as 100kPA can be used, however cold water delivery will be
reduced.

PRECAUTIONS

The boiling water unit must be maintained in accordance with the Owner’s Guide and

Installation Instructions.
If this boiling water unit is to be used where an uninterrupted boiling water supply is

necessary for your application or business you should ensure that you have back up
redundancy within the building. This should ensure the continuity of boiling water
supply in the event that this boiling water unit 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.

BOILING WATER

The Rheem boiling water unit is electronically controlled to obtain the maximum
performance, and incorporates further safety devices to prevent over temperature
and over filling.

ELECTRONIC CONTROLLER & TIMER

Your Rheem boiling water unit incorporates smart heating software and an electronic
timer to obtain the best efficiency for the energy used. The electronic timer allows the
user to program when the unit is on or off and when the sleep mode activates to save
energy. Also the unit has the ability to indicate and diagnose any system faults that
occur. (Refer “Setting the Timer” on page 8).

ENVIRONMENT

If a chiller unit is installed, at the end of the service life and prior to the chiller being
disposed of, a person qualified to work with refrigerants must recover the refrigerant
from within the sealed system. The refrigerant must not be vented to atmosphere.
Phone your nearest Rheem Service Department or Rheem Service Centre to arrange
for an inspection.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

WATER FILTER

The Rheem Boiling Water Unit incorporates an integral water filter. The water filter
improves the quality of water by filtering odours and particles. Over time the water
filter could become blocked with particles. Rheem recommends that the water filter
be changed at least every 12 months. The boiling water unit controller has an
*electronic filter counter that lets the operator know when the filter is getting close to
its recommended life. (*If activated by installer)

IMPORTANT

Rheem highly recommends that regular water filter cartridge changes are carried out
to ensure the system is performing to a high standard. If the water filter is not
regularly serviced and maintained on the recommended intervals, the water filter
cartridge can block with the trapped impurities, causing bacterial growth in the filter
media and dramatically reducing filtered water flow, affecting the operation of the
filtered boiling water unit.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

SETTING THE TIMER

Your Rheem boiling water unit is supplied with a programmable 7 day timer which
allows the unit to operate in the most efficient fashion to suit your needs. The timer
also incorporates a sleep mode which can be set to automatically shut the system
down after a set period of time of no use, i.e. 6 hours. The boiling water unit timer will
also control a Rheem chiller (if fitted). The Rheem tap features a safety lock function
requiring 2 finger operation to protect to users from unintentionally dispensing boiling
water when set in this mode (refer to page14).

Function

Mode

Description

A) Clock

N/A

Set clock time.

B) STD/AUTO
STD

BWU ‘ON’ 24 hours/7 days.

AUTO

BWU operates according to programmed
‘Set ON/OFF Times’.

C) Set ON/OFF
Times

N/A

Program ON/OFF times for AUTO mode.

D) Sleep Delay
Time

N/A

Program delay-off time from last usage
(operates in AUTO mode only).

E) Filter Life
Remaining Life

Displays remaining filter life in litres.

Filter Reset

Resets filter ‘Remaining Life’ to ‘Set Filter

Life’ setting. Utilised when replacing filter.

Set Filter Life

Program filter life start value in litres.

F) Service Menu

Error Codes

Displays alpha error codes (refer to page 11
for error codes and their meanings).

Boiling Temp

Displays the current boiling water
temperature in °C.

Chiller Temp

Displays the current chiller water
temperature in °C.

Calib. Reset

Reactivates automatic boiling point
calibration operation.

Temp Override

Manually select calibrated temp setting.
Selectable from 70 – 99°C.

Software
Version

Displays Timer and Controller software
versions (top = Timer, lower = Controller).

Temp Show
ON/OFF

Enable/disable boiling water temperature
display on timer screen (in °C).

TB Treq

Displays boiling water temperatures in °C.
(TB = calibrated temp, Treq = maintained
temp).

G) Chiller Select
IMPORTANT:-
Select correct
chiller type.

AUTO

Automatically detects type of chiller unit.

No Chiller

Select if a stand alone chiller is installed.

Push Thr. Chil.

Select if a push through chiller is installed.

Pumped Chiller

Select if a pumped chiller unit is installed.

H) Chiller Temp

5°C – 15°C

Set chilled water temperature.

I) Cold tap time

5s – 60s

Set cold tap maximum on time.

J) Hot tap time

5s – 20s

Set hot tap maximum on time.

K) Key lock

Enable/disable key lock function to prevent tampering with
timer settings.

* ON/OFF and Sleep Delay times operate in AUTO Mode.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

To select a Timer Mode

Press the (Prog) button until the desired mode is displayed on the screen. Press the
(Accept) button to confirm selection. Pressing (Cancel) button at any time returns
the unit to the main menu. Any functions previously accepted will be retained.

Note: The display will revert back to main menu from any mode if a button has not
been pressed for 1 minute.

A) Setting the clock

Select the clock mode
(Prog>Clock>Accept)

Display Shows: “Set Clock Day”.
Press the (UP) button until the desired day appears on the screen and press the
(Accept) button to confirm selection.

Display Shows: “Set Clock HOUR”
Press the (UP) button until the desired hour (24 Hour Time) appears flashing on the
screen and press the (Accept) button to confirm selection.

Display Shows: “Set Clock MIN”
Press the (UP) button until the desired minute appears flashing on the screen.

Press the (Accept) button to confirm selection and the display reverts to the main
menu.

B) Set timer to STD/AUTO mode

Select the Timer STD/AUTO mode (Prog>Timer STD/AUTO>Accept)
Display Shows: “STD”
Pressing the (UP) button alternates “STD”/“AUTO” mode. “STD” mode means that
the unit operates 24 hours a day, “AUTO” mode means the unit operates during the
preset time periods (7am - 5.30pm, Mon - Fri) on the timer. Press the (Accept)
button to confirm selection and the display reverts to the main menu. If the timer is in

“AUTO” mode, pushing any timer key or lever on the tap will reactivate the unit. The
unit will operate normally until the next programmed “Off” time.

C) Programming set on/off times (For use in “AUTO” Mode)

Select the Timer ON/OFF mode
(Prog>Set ON/OFF times>Accept)
Note: To set the unit to be in “Off” mode for an entire day, set the “On” and “Off”

times to be the same eg: On = 0:00 Off = 0:00
Display Shows: “SUN” “7:00 – 7:00” “Set ON hour”.
Press the (UP) button until the desired hour appears on the screen and press the

(Accept) button to confirm selection.
Display Shows: “SUN” “7:00 – 7:00” “Set ON minute”.
Press the (UP) button until the desired minute appears on the screen and press the

(Accept) button to confirm selection.
Display Shows: “SUN” “7:00 – 7:00” “Set OFF hour”.
Press the (UP) button until the desired hour appears on the screen and press the

(Accept) button to confirm selection.
Display Shows: “SUN” “7:00 – 7:00” “Set OFF Minute”.
Press the (UP) button until the desired minute appears on the screen and press the

(Accept) button to confirm selection and advance to the next day.

Display Shows: “MON” “7:30 – 17:30” “Set ON hour”.
Note: Continue with same procedure for Monday through to Saturday.

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Rheem New Zealand Ltd 743 Series BWU Document #: 318489B

D) Programming sleep delay time.

Select the Sleep on/off mode (Prog>Sleep DelayTime>Accept)
Display Shows: “Sleep Delay Time” “OFF”.

The Sleep Delay Function puts the unit in a standby mode after a user defined period
(1 - 6 hours). The Sleep Delay Function factory default setting is OFF. Pressing the
(UP) button increases the sleep delay time up to 6 hours. Press the (Accept) button
to confirm selection and the display reverts to the main menu. The unit will go into

“Sleep” mode if it has not been used during the “Sleep delay time” period. To exit
“Sleep”, push any timer key or lever on the tap. If you activate the Sleep Delay Timer

we recommend that you also activate the Temp Show On/Off function.

E) Filter Life

Select the Appropriate Filter Mode (Prog>Filter life>Accept)

i) Remaining Life
ii) Filter Reset

i) To Select Remaining Life mode

(Prog>Filter Life>Accept>Remaining Life)
Display Shows: “Remaining Life” “XXXX litres”

Press the (Cancel) or (Accept) button to revert back to the main menu.

ii) To Select the Filter Reset mode

(Prog> Filter Life >Accept>filter reset>Accept)

Display Shows: “Filter Reset”
Press the (Accept) button to confirm selection at which time you are prompted

“Are you sure?”. Press (Accept) once more then,
Display Shows: “Set Filter Life” “XXXX Litres”.

Pressing the (UP) button scrolls from the filter OFF selection (this turns the filter
count off if a filter is not installed with the boiling water unit) up to 12,000 litres. We
recommend a default value of 4,000 litres, until the user knows the filter will last
longer. Press the (Accept) button to confirm selection and the display reverts to
the Filter menu.

F) Accessing service menu

The service menu has seven modes to select from (refer to ‘timer functions’ on page

8). This function allows easy identification of problems occurring with the unit by the
service technicians (see details on the Error code table (page 11) for product error
codes).

Select appropriate Service Mode

i. Error Codes

ii. Boiling Temp

iii. Chiller Temp (display only)

iv. Calib Reset

v. Temp. Override

vi. Software Version

vii. Temp Show ON/OFF

viii. TB Treq