Rheem Pronto 012 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
Rheem Pronto
Instantaneous Gas Water Heater
834 Series
012, 016 Models

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.
TRADEMARKS
® Registered trademark of Rheem Australia Pty Ltd.
™ Trademark of 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 12.
The other pages are intended for the installer but may be of interest.
About Your Water Heater............................................................................................................ 4
Water Supplies........................................................................................................................... 10
Save A Service Call................................................................................................................... 11
Installation –Water Heater ....................................................................................................... 13
Connections –Plumbing .......................................................................................................... 20
Wiring Diagram.......................................................................................................................... 21
Commissioning.......................................................................................................................... 22
Draining The Water Heater ....................................................................................................... 26
Warranty..................................................................................................................................... 27

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.
This water heater is not suitable for pool heating, or as part of hot water circulation flow and return system, or
as an in-series booster for a solar water heater, and MUST NOT be used for these applications.
MODEL TYPE
The Rheem®instantaneous gas water heater model you have chosen is for outdoor installation only. This
model has a manufacturer’s warranty (refer to the Rheem warranty on page 27).
The water heater has a maximum preset outlet temperature setting of 60°C.
This 834 series water heater is fitted with:
A hydro-electric generator which provides power to operate the electronic
system. An external electrical power source is not required.
Electronic ignition
Electronic temperature control
Manual seasonal water flow adjustment valve as a supplementary control
to compensate for seasonal variations in mains water supply temperature
Cold start-up energy saving and water saving functions
Electronic overheat protection
Over-temperature cut-off device
Inlet water strainer
Overpressure relief valve
Self-diagnosis function.
WATER HEATER OPERATION
The water heater operates automatically, heating water as it passes through
the water heater. When a hottap is opened, the gas burners ignite to provide
immediate heating of the water. A “green” LED will illuminate when the water
heater is operating. The heat produced by the burner is transferred to the
water through the heat exchanger. The water is heated to the preset outlet
temperature by the automatic adjustment of the gas supply to the burner to
suit the water flow rate. 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.
Notes
For areas that may experience very cold mains water temperature in
winter, it may be necessary to set the seasonal water flow adjustment
valve (located at the underside of the water heater) to the “Winter”
position to reduce the risk of insufficient heating of the water. Reset the
seasonal water flow adjustment valve to the “Summer” or another
intermediate position as the mains water supply becomes warmer.
It is recommended to use water saving shower heads and tap ware with
this water heater. This will not only reduce water usage, but also assist
with temperature control in winter and temperature fluctuation caused
by simultaneous water draw off from other taps.
For areas with a lower mains water pressure supply, it is advisable to
set the seasonal water flow adjustment valve to the “Summer” position
only. This will minimise water flow restriction through the water heater.
green LED illuminates when heating
water flow adjustment valve
(manual seasonal adjustment)

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 15, 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.
Note: It is not recommended this water heater be installed with a low pressure water supply.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the water heater has not operated for some time (which is most often first thing in
the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat exchanger
warms up. This is both an energy and water saving feature of this water heater. Once the heat exchanger
has warmed up the hot water flow will increase and remain at normal flow levels. This feature will only occur
at a cold start-up and not when the heat exchanger is already warm from a recent use of hot water.
HOW HOT SHOULD THE WATER BE?
The water heater heats the water to the preset outlet temperature setting.
The factory preset outlet temperature setting of the 834 series water heater
is 60°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, Rheem Service or their nearest Accredited Service Agent.
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 an 834 series 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 the preset outlet temperature setting has not
been adjusted below 60°C, still allow hotter water to the kitchen and laundry.
SAFETY
This water heater is supplied with a temperature sensor, over-temperature cut-off device 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.
The Rheem 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.
maximum and factory
preset outlet
temperature setting
maximum
recommended supply
temperature to
bathrooms and
ensuites

ABOUT YOUR WATER HEATER
6
WARNINGS
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.
For continued safety of this water heater it must be installed, operated and maintained in accordance with
the Owner’s Guide and Installation Instructions.
Do not modify this water heater.
Do not use or store flammable materials in or near this water
heater. Flammable liquids (such as petrol), combustible materials
(such as newspapers) and similar articles must be kept well away
from the water heater and the flue terminal.
Do not spray aerosols in the vicinity of this water heater while it is in
operation. Gases from some aerosol sprays become corrosive
when drawn into a flame.
Do not store swimming pool chemicals, household cleaners,
etc., near the water heater.
Do not place articles on or against this 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 LP gas fuel, in a Propane
model is unsafe and can cause damage to the water heater.
PRECAUTIONS
The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions. Refer
to “General Maintenance” on page 6, “Minor Maintenance Every Six Months”on page 7 and “Major Service
Every Five Years”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.
It is recommended to turn off the cold water isolation valve to the water heater prior to performing general
maintenance. This will prevent the water heater from being used while you clean or spray around the water
heater. Turn on the cold water isolation valve when finished performing the general maintenance.
Warning: Do not spray the water heater with insecticide while the water heater is running. Propellants in
insect spray may contain hydrocarbon which can catch fire.

ABOUT YOUR WATER HEATER
7
MINOR MAINTENANCE EVERY SIX MONTHS
This can be performed by the dwelling occupant.
It is recommended to turn off the cold water isolation valve to the water heater prior to performing general
maintenance. This will prevent the water heater from being used while you clean or spray around the water
heater. Turn on the cold water isolation valve when finished performing the general maintenance.
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.
Warning: Do not spray the water heater with insecticide while the water heater is running.
Propellants in insect spray may contain hydrocarbon which can catch fire.
MAJOR SERVICE EVERY FIVE YEARS
For safe and efficient operation, it is recommended a major service be conducted on the water heater every
five years.
Warning: Servicing of a water heater must only be carried out by qualified personnel. Phone Rheem
Service or their nearest Accredited Service Agent.
Note: The major service and routine replacement of any components, if required, are not included in the
Rheem warranty. A charge will be made for this work. Only genuine replacement parts should be used on this
water heater.
The major service includes the following actions:
Remove and clean cold water inlet strainer.
Check and if necessary adjust the gas pressure.
Check the operation of and clean the burner and heat exchanger.
Visually check the unit for any potential problems.
Inspect all connections.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
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: This water heater does not have a frost protection system. If there is a risk of freezing conditions, the
water heater must be drained, otherwise damage could result (refer “No Frost Protection” on page 8 and
“Draining the Water Heater”on page 8).

ABOUT YOUR WATER HEATER
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.
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 7.
NO FROST PROTECTION
The water heater is NOT fitted with a frost protection system. If there is a risk of freezing, then it is necessary
to drain the water heater (refer to “Draining the Water Heater” on page 8).
Notes:
Damage caused by freezing is not covered by the Rheem warranty (refer to “Terms of the Rheem
Warranty” on page 27).
Pipe work to and from the water heater must be adequately insulated to prevent freezing.
DRAINING THE WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater” on page 7).
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
9
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 13 to 18. 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, and either AS 5601 or AS/NZS 5601.1 as applicable under
local regulations, and all local codes and regulatory authority requirements.
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 10.
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 10.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer’s warranty (refer to page 27). 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 6.

10
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Rheem
warranty.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies.
However, there are some known water chemistries which can have detrimental effects on the water heater
and its operation and / or life expectancy. If you are unsure of your water chemistry, you may be able to obtain
information from your local water supply authority. This water heater should only be connected to a water
supply which complies with these guidelines for the Rheem warranty to apply.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and / or life expectation of a heat exchanger in an instantaneous water heater.
Where there is a changeover from one water supply to another, e.g. a rainwater tank supply, bore water supply,
desalinated water supply, public reticulated water supply or water brought in from another supply, then water
chemistry information should be sought from the supplier or it should be tested to ensure the water supply
meets the requirements given in these guidelines for the Rheem warranty to apply.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water’s corrosive or scaling properties. The saturation
index figures stated are calculated using a water temperature of 80°C.
In a corrosive water supply, the water can attack copper parts and cause them to fail. Where the saturation
index is less than –1.0, the water is very corrosive and the Rheem warranty does not apply to a copper heat
exchanger in a continuous flow water heater.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface. Where
the saturation index exceeds +0.80, the Rheem warranty does not apply to a copper heat exchanger in an
instantaneous water heater.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
Refer to the Saturation Index chart on page 10.
+0.4 +0.80-1.0
no warranty applies to a:
-continuous flow copper heat
exchanger
SATURATION INDEX (SI)
GAS CONTINUOUS FLOW WATER HEATERS
WITHIN WARRANTY
SPECIFICATION
SATURATION INDEX
(calculated @ 80°C water temperature)
no warranty applies to a:
-continuous flow copper heat
exchanger
very corrosive very scaling
scaling
corrosive

11
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or fault,
which is not related to manufacture or failure of a part (refer to “Terms of the Rheem Warranty” on page 27).
COLD WATER FROM THE HOT TAP
Close the hot tap, wait 10 seconds and open the hot tap again.
Is the hot tap open enough or is the water flow rate too low?
The burners will not light if the flow rate is less than 3.0 L / min.
The cold water inlet strainer may require cleaning.
Is the isolation valve in the gas line open?
Is there a gas supply to the rest of the house?
Try lighting another gas appliance.
Has the gas line been purged of air after installation?
Refer to your plumber.
WATER IS NOT HOT ENOUGH
Is the seasonal water flow adjustment valve set to an inappropriate setting?
Set to the “Winter” position.
WATER FLOW OR TEMPERATURE FLUCTUATES
More than one tap in use at the same time may cause a decrease in the hot water flow or a fluctuation in hot
water temperature from the taps.
Is more than one tap open, or is an appliance such as a dishwasher or washing machine, in use at the
same time?
Ensure only one tap or appliances is on at the one time.
Is one outlet (especially the shower) using more hot water than you think?
Check the flow of the water from one tap, e.g. the shower. The shower should be adjusted so the hot tap
is fully open. Installing water saving shower heads and tap ware or a flow control valve to each hot water
outlet can reduce water flow and temperature fluctuation.
Do you have the correct size water heater for your requirements?
The sizing guide in the sales literature and on the Rheem website (www.rheem.com.au) suggests average
sizes that may be needed.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the water heater has not operated for some time (which is most often first thing in
the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat exchanger
warms up. This is both an energy and water saving feature of this water heater. Once the heat exchanger
has warmed up the hot water flow will increase and remain at normal flow levels. This feature will only occur
at a cold start-up and not when the heat exchanger is already warm from a recent use of hot water.
NO WATER FROM THE HOT TAP
No flow of water from the hot tap may indicate a restriction in or failure of the cold water supply to the water
heater. Check for water flow at other taps and that the cold water isolation valve (refer to page 20)is fully open.

SAVE A SERVICE CALL
12
CLOUDS OF WHITE ‘VAPOUR’ FROM THE FLUE TERMINAL
During the heating cycle, it is not unusual to see water vapour clouds
steaming from the flue terminal, particularly on cold or humid days. This
is normal operation of the water heater.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the water heater controls.
This valve protects the water heater, by allowing water to escape, in the
event of excessive pressure build-up in the waterways.
Normal operation
A small volume of water may discharge from the bottom of the water
heater when a hot tap is suddenly closed.
Continuous dribble
A continuous dribble may indicate the water supply pressure is
above the design pressure for the water heater. If so, a pressure
limiting valve must be installed on the cold water supply pipe to the
water heater (refer to “Mains Water Supply”on page 15).
ERROR CODE
The water heater provides a diagnostic error code in the event of an
interruption to its operation. The error code is displayed on the indication
window on the front of the water heater as a flashing red LED whilst the
hot tap is open. If the red LED is flashing:
Close the hot tap.
Check the gas isolation valve at the gas inlet to the water heater is
fully open.
Wait 5 minutes, then open a hot tap.
If the error code persists, count the number of flashes and then turn off
the hot tap. Phone Rheem Service or their nearest Accredited Service
Agent to arrange for inspection.
HIGHER THAN EXPECTED GAS BILLS
Should you at any time, feel your gas bill is higher than expected, we
suggest you check the following points:
Is one outlet (especially the shower) using more hot water than you
think?
Carefully review the family’s hot water usage. Inexpensive flow
control valves can be easily fitted to the shower outlets to reduce
water usage.
Has there been an increase in hot water usage?
An increase in hot water usage will result in an increase in water
heater operation.
Has your water heating tariff rate been increased by your gas
retailer since your previous bill?
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE, PHONE
RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT.

13
INSTALLATION –WATER HEATER
THIS WATER HEATER IS FOR OUTDOOR INSTALLATION ONLY.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
Check the water heater is suitable for the gas type available.
(refer to the rating label on the water heater)
INSTALLATION STANDARDS
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, and either AS 5601 or AS/NZS 5601.1 as applicable under
local regulations, and all local codes and regulatory authority requirements.
All packaging materials must be removed from the water heater prior to its installation.
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.
This water heater is not suitable for pool heating, or as part of hot water circulation flow and return system, or
as an in-series booster for a solar water heater, and MUST NOT be used for these applications.
If this water heater is to be used where an uninterrupted hot water supply is necessary for the application or
business, then there should be 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 was to become inoperable for any reason.
We recommend you provide advice to the system owner about their needs and building back-up redundancy
into the hot water supply system.
WATER HEATER LOCATION
The water heater is suitable for outdoor installation only and should be installed close to the most frequently
used outlet and its position chosen with safety and service in mind. Make sure people (particularly children)
will not touch the flue terminal. The flue terminal and air inlet must be clear of obstructions and shrubbery.
Clearance must be allowed for servicing of the water heater. The water heater must be accessible without the
use of a ladder or scaffold. Make sure the entire front panel can be removed for service. You must be able to
read the information on the rating plate. Remember you may have to take the entire water heater out later for
servicing.
This water heater must be installed vertically upright with the water and gas connections on the underside,
pointing toward the ground. The back of the water heater can be either against a wall or supported by a frame.
If the water heater is fitted on a wall of combustible material, the
wall must be protected by a fire resistant heat shield. Refer to “Heat
Shield” on page 16 for the size and location of the heat shield.
Note: The water heater must be well secured to the wall or frame
using two fasteners at the top and one fastener at the bottom of
the unit (refer to page 18 for mounting hole positions and weight of
the water heater). Use the screws provided only if they are suitable
for the wall or frame type. Otherwise select and use alternative
fasteners suitable for the application. The fasteners must be
capable of bearing the full weight of the water heater so it may not
work loose nor impose any load on the gas and water pipe work
connected to the water heater. Refer to the fastener
manufacturer’s information and recommendations for the type of
fastener to use for the wall or frame type and load bearing
requirements.

INSTALLATION –WATER HEATER
14
The water heater must not be installed in an area with a corrosive atmosphere where chemicals are stored or
where aerosol propellants are released. Remember the air may be safe to breathe, but when it goes through
a flame, chemical changes take place which may attack the water heater.
A secondary flue is not required. The water heater must not be installed indoors or in a confined space.
The water heater must be located to ensure that the location of the flue terminal complies with the requirements
of AS 5601 or AS/NZS 5601.1, as applicable under local regulations. As a guide the following requirements
are extracted from theGas Installations Standard. The distances are measured alongthe wall behind the water
heater.
At least 500 mm between the top of the flue terminal
and the eaves.
At least 500mm between the flue terminal and the edge
of any opening into the building, such as an openable
door or window, measured horizontally*.
At least 1000 mm between the top of the flue terminal
and the edge of any opening into the building, such as
an openable window, measured vertically.
At least 500 mm between the flue terminal and a return
wall or external corner, measured horizontally*.
At least 500 mm between the flue terminal and any
opening into a building, in the direction of the flue
discharge.
At least 500 mm between the flue terminal and a fence, wall or other obstruction, in the direction of the
flue discharge.
Note: * If these horizontal distances cannot be achieved, AS/NZS 5601.1 states an equivalent horizontal
distance measured diagonally from the nearest discharge point of the flue terminal to the opening may be
deemed to comply. Check with the local regulator.
NO FROST PROTECTION
The water heater is NOT fitted with a frost protection system. If there is a risk of freezing, then it is necessary
to drain the water heater (refer to “Draining the Water Heater” on page 26). Damage caused by freezing is not
covered by the Rheem warranty (refer to “Terms of the Rheem Warranty” on page 27).
Damage to the water heater caused by freezing of the pipe work to or from the water heater is not covered
under the Rheem warranty. Refer to AS/NZS 3500.4 for precautions to be taken for installations in frost prone
areas.
The cold water line to the water heater must be insulated with suitable thickness insulation if freezing conditions
are likely to occur. The insulation must be fitted to the underside of the water heater and be weatherproof and
UV resistant if exposed.
REDUCING HEAT LOSSES
The cold water line to and hot water line from the water heater must be insulated in accordance with the
requirements of AS/NZS 3500.4 to. The insulation must be weatherproof and UV resistant if exposed. The
insulation must be fitted up to the connections on the underside of the water heater.
FLUE CLEARANCES
MECHANICAL INSTANTANEOUS
843 SERIES
500 MIN 500 MIN
500 MIN
SK7686 REV AD 6/15

INSTALLATION –WATER HEATER
15
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below, an approved pressure limiting
valve that does not have non-return valve characteristics (such as an RMC PSL series valve) is required and
should be fitted as shown in the installation diagram (refer to page 20).
Model
012
016
Relief valve setting
1000 kPa
1000 kPa
Max. mains supply pressure
800 kPa
800 kPa
Min. mains supply working pressure *
120 kPa
140 kPa
* minimum water supply working pressure required to achieve the rated flow
and performance
Notes:
It is not recommended to install this water heater with a low pressure water supply.
A minimum water supply working pressure of 140 kPa for 016 models and 120 kPa is required for
012 models, i.e. whilst water is flowing through the water heater, is required to achieve the rated flow and
performance of the water heater.
If sludge or foreign matter is present in the water supply, it is recommended a suitable filter be incorporated
in the cold water line to the water heater.
This water heater is not suitable for connection to bore water or spring water unless a water treatment
device is fitted.
Refer to “Water Supplies”on page 10 for further information on water chemistry.

INSTALLATION –WATER HEATER
16
HEAT SHIELD
If the water heater is installed on a wall of combustible material, the wall must be protected by a heat shield.
The minimum dimensions of the heat shield are 850 mm wide x 400 mm high. If a metal plate is used, its
minimum thickness must be 0.8 mm and when installed must provide air gaps on both the front face between
the flue terminal and heat shield and on the rear face between the wall and the heat shield. A 9 mm air gap is
recommended between the rear face of the heat shield and the wall surface to enable natural convective
cooling of the wall surface.
Refer to the Heat Shield Dimensions and Position diagram no page 16.
A heat shield is available from Rheem (PN 299880) as an accessory.
Notes:
If the installation is on an uneven wall surface, ensure a metal plate heat shield is NOT in contact with the
wall surface. In some situations, it may be necessary to fix a backing plate onto the wall to even out the
wall surface. The heat shield would then mount to the backing plate.
Ensure the air gap between the heat shield and the wall surface or backing plate (if one is installed) is
kept clear, allowing natural ventilation.
Heat Shield Dimensions and Position
20mm*
BOTTOM EDGE OF
SHIELD MUST BE
EXTENDED PAST
THE LOWER EDGE
OF FLUE OUTLET
GRILLE
APPROXIMATELY
188mm (012 MODEL), OR
225mm (016 MODELS)
FROM MOUNTING HOLE
NOTE: * MINIMUM DIMENSIONS
HEAT SHIELD DIMENSIONS & POSITION
MECHANICAL INSTANTANEOUS
843 SERIES
SK7696 REV AD 6/15
400mm*
850mm*
==
245mm*
HEAT SHIELD
FOR USE WHEN MOUNTING THE
WATER HEATER ON A
COMBUSTIBLE SURFACE

INSTALLATION –WATER HEATER
17
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between an 834 series water
heater and the hot water outlets in any ablution and public areas such as a bathroom, ensuite or public
amenities, to reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the
installation of this water heater meets the delivery water temperature requirements of AS/NZS 3500.4 so that
scalding water temperatures are not delivered to a bathroom, ensuite or other ablution or public area.
The temperature limiting device must be of a type suitable for use with an instantaneous gas water heater and
should have:
a specified ‘minimum temperature differential’between the hot water inlet and the tempered water outlet
of no greater than 10°C, and
a specified ‘maximum permitted pressure variation’in the supply between the hot water inlet and the cold
water inlet of no less than 15%.
Refer to the specifications of the temperature limiting device.
Where a temperature limiting device is installed adjacent to the water heater, the cold water line to the
temperature limiting device can be branched off the cold water line either before or after the isolation valve
and pressure limiting valve to the water heater.
If a pressure limiting valve is installed on the cold water line to the water heater and the cold water line to a
temperature limiting device branches off before this valve or from another cold water line in the premises, then
a pressure limiting valve of an equal pressure setting may be required prior to the temperature limiting device.
Two Temperature Zones Using a Temperature Limiting Device
LEGEND

INSTALLATION –WATER HEATER
18
DIMENSIONS AND TECHNICAL DATA
A G
D B
HOT WATER
OUTLET GAS INLET
(FLUSH TO BASE)
COLD WATER
INLET
69 K
HOT WATER
OUTLET
GAS INLET 120 120
69
COLD WATER
INLET
222
285
268
250
H
M L
DIMENSIONS DIAGRAM
MECHANICAL INSTANTANEOUS
843 SERIES
R3.5
R8

120 120
D E
(12L ONLY)
5
Model
834 012
834 016
Rated delivery
(@ 40°C rise)
litres / min
7.3
9.8
Recovery
(@ 25°C rise)
litres / min
12
16
Mass Empty (unpackaged)
kg
21
25
Dimensions
A
B
D
E
G
H
K
L
M
834 012
mm
840
388
45
45
830
465
55
70
70
834 016
mm
875
443
50
50
866
451
48
84
84
Gas
Details
Hourly Gas
Consumption
(MJ)
Minimum
Gas
Pressure
(kPa)
Test Point Gas Pressure (kPa)
Maximum
Gas
Pressure
(kPa)
Injector Size
(mm)
Pilot
Injector
(mm)
minimum
maximum
Size
012
016
012, 016
012
016
012
016
012, 016
012
016
012, 016
Natural
99
128
1.13
0.080
0.088
0.72
0.74
3.50
14 x 1.30
18 x 1.30
0.60
Propane
96
125
2.75
0.210
0.210
1.85
1.85
3.50
14 x 0.80
18 x 0.80
0.35
Model numbers: N = Natural, P = Propane, to denote gas type.
Letter N or P is included in the model number, e.g. 834016N0.
Character following gas type letter, 0 = no frost protection.
Technical data is subject to change.

INSTALLATION –WATER HEATER
19
TYPICAL INSTALLATION –OUTDOOR LOCATION
TYPICAL INSTALLATION
MECHANICAL INSTANTANEOUS GAS WATER HEATER
843 SERIES

20
CONNECTIONS –PLUMBING
All plumbing work must be carried out by a qualified person and in compliance with the Standard
AS/NZS 3500.4 and all local codes and regulatory authority requirements.
All gas work must be carried out by a qualified person and in compliance with the Standard AS 5601 or
AS/NZS 5601.1, as applicable under local regulations, and all local codes and regulatory authority
requirements.
Note: The water heater is fitted with a gas pressure regulator preset to the gas type of the water heater. There
is no need to install an additional gas pressure regulator unless the gas supply pressure exceeds 3.5 kPa.
CONNECTION SIZES
Model
834 012
834 016
Hot water connection
R 1/2
R 1/2
Cold water connection
R 1/2
R 1/2
Gas inlet connection
Rp 3/4
Rp 3/4
WATER INLET AND OUTLET
All pipe work must be cleared of foreign matter before
connection and purged before attempting to operate the
water heater. All olive compression fittings must use
brass or copper olives. Use an approved thread sealant
such as Teflon tape on all threaded joints.
A full flow gate valve or ball valve must be installed on
the cold water line to the water heater. A non-return
valve or stop tap must not be installed. An acceptable
arrangement is shown in the diagram. Refer also to “Hot
Water Delivery” on page 17 and to “Mains Water Supply”
on page 15.
A disconnection union must always be provided at the
cold water inlet and hot water outlet on the water heater
to allow for disconnection of the water heater.
Insulation used on the cold and hot water lines must extend up to the cold water inlet and hot water outlet of
the water heater.
Notes:
It is essential all pipe connections be correctly aligned, otherwise component connections within the water
heater may be strained and / or components themselves misaligned. It is recommended also, wherever
possible, pipe connections be made at the water heater first and final pipe runs be made in soft copper
pipe to allow some adjustment for misalignment.
Use the spanner flats on the water heater fittings and take care to avoid twisting the water inlet and outlet
pipes inside the jacket.
PIPE SIZES
The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing
the most suitable pipe size to ensure adequate flow for each individual application. Reference to the technical
specifications of the water heater and local regulatory authority requirements must be made.
To achieve true mains pressure operation, the cold water line to the water heater should be the same size or
bigger than the hot water line from the water heater.
The minimum recommended cold pipe and hot pipe size is DN15.
Gas Water Heater
Cold and Hot Water and Gas Connection Details
GAS
COCK GAS
COLD WATER
PRESSURE LIMITING VALVE
(PSL TYPE)
GATE VALVE
OR
BALL VALVE
NATURAL / PROPANE
GAS PRESSURE
REGULATOR IS
FACTORY - FITTED
INSIDE
HOT
WATER
COLD & HOT WATER & GAS CONNECTION DETAILS
MECHANICAL INSTANTANEOUS
843 SERIES
SK7690 REV AD 6/15