Rheem Integrity 20 Technical Document

1
Owners
Guide
and
Installation
Instructions
This water heater must be installed and serviced by an authorised person.
Please leave this guide with the householder.

2
PATENTS
This water heater may be protected by one or more patents or registered designs in the
name of Rheem Australia Limited, Southcorp Australia Pty Ltd or Paloma Industries Ltd.
Southcorp Water Heaters Australia is the supplier of the Rheem integrity range of
electronic instantaneous gas water heaters, manufactured by Paloma Industries Ltd, a
world leader in water heater technology and manufacture.

3
CONTENTS
HOUSEHOLDER - We recommend you read pages 4 to 15.
The other pages are intended for the installer but may be of interest.
About your water heater...................................................... 4
Temperature control ............................................................ 7
Save a service call ............................................................. 14
Installation - Water heater ................................................. 16
Dimensions ......................................................................... 18
Connections - Plumbing .................................................... 19
Connections - Electrical .................................................... 19
Commissioning .................................................................. 20
Installation - Controllers .................................................... 22
Installation - Diagrams....................................................... 26
Water supplies.................................................................... 27
Warranty.............................................................................. 28

4
MODEL TYPE
Congratulations for choosing a Rheem integrity electronic instantaneous gas water heater.
The model you have chosen is for outdoor installation only. The water heater operates
automatically. When a hot tap is opened, the gas burners ignite to provide immediate
heating of the water. The gas burners extinguish when the hot tap is closed.
HOW HOT SHOULD THE WATER BE?
This type of water heater operates on the principle
of heating water as it passes through the water
heater. The outlet temperature is selected by the
user at the controller (if installed). If a controller is
not installed, the water heater defaults to the preset
outlet temperature. The temperature is then kept
constant by the automatic adjustment of the burner
input and water flow rate (refer to Temperature
Control on pages 7 to 13).
Note: The preset outlet temperature setting of
this water heater cannot be adjusted by the
householder. This setting can only be adjusted
by Southcorp Water Heaters Australia or their
Accredited Service Agent.
HOTTER WATER INCREASES THE RISK
OF SCALD INJURY
We recommend, and it may also be required by
regulations, that an approved temperature limiting
device be fitted into the hot water piping to the
bathroom and ensuite. This will keep the water
temperature below 50°C at the bathroom and
ensuite. The risk of scald injury will be reduced and, if a Kitchen controller is installed, still
allow hotter water to the kitchen and laundry.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater, such as when going on vacation:
● Turn off the water heater using the “on/off” button on the controller/s (if fitted).
● Close the gas and water isolation valves at the inlets to the water heater.
● If the water heater does not have frost protection, switch off the electrical supply at
the power outlet to the water heater.
Note: The electrical supply should not be switched off for models fitted with frost protection,
unless the water heater is drained. Otherwise damage could result from freezing conditions
(refer to Frost Protection and Draining the Water Heater on page 6 ).
ABOUT YOUR WATER HEATER

5
TO TURN ON THE WATER HEATER
If the water heater has been drained, screw in the drain plugs at the cold water inlet and
hot water outlet of the water heater and open all of the hot water 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 hot taps. As water flows freely from each tap, close
it. Open the gas isolation valve fully at the inlet to the water heater, plug the water heater
power lead into the electrical outlet and switch on. Turn on the water heater at the controller
(if fitted). The water heater will then operate automatically when you open a hot tap.
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. Ensure the water
heater flue terminal and air inlet are not obstructed in any way at any time.
The water heater should be serviced annually by Southcorp Water Heaters Australia or
their Accredited Service Agent. Only genuine replacement parts should be used with this
water heater.
SAFETY INSTRUCTIONS
Propane models are designed to operate on Propane
only. The use of Propane/Butane mixture such as
automotive LPG fuel is unsafe and can cause damage
to the water heater.
Do not store or use chemicals or flammable
materials near the water heater.
Do not spray aerosols near the water heater.
Do not place anything on top of or against the
water heater, or in contact with the flue terminal.
The flue gases and the flue terminal on the water
heater are hot when the water heater is operating.
Keep clear of this area to avoid burns.
ELECTRICAL POWER
The water heater uses 240 volt AC electrical power for operation of the control systems and
the combustion fan. 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.
ABOUT YOUR WATER HEATER

6
FROST PROTECTION
The water heater may have frost protection. Refer to the rating label on the water heater.
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 occurring. Models
without frost protection are not covered under warranty for damage caused by freezing.
Notes:
● 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 (refer to Draining the
Water Heater on page 6).
● 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.
● 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 28.
DRAINING THE WATER HEATER
● Turn off the water heater (refer to Turn Off the Water Heater on page 4).
● 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

7
TEMPERATURE CONTROL
Rheem controllers enable the user to control the temperature of the delivered water
from the outlet of the water heater. There are three controllers suitable for installation
with this water heater. They are the Kitchen controller, Bathroom1 controller and
Bathroom2 controller. One, two or three controllers can be installed. A Bathroom2
controller can only be installed if a Bathroom1 controller is installed. Only one of
each type of controller can be connected to the water heater.
The temperature settings of each type of controller are:
Bathroom1 & 2 37oC to 46oC (in 1oC increments), 48oC, 50oC.
Kitchen 37oC to 46oC (in 1oC increments), 48oC, 50oC, 55oC, 60oC.
The installation of Bathroom controller/s only (ie. no Kitchen controller) limits the
outlet temperature of the water heater to a maximum of 50ºC, regardless of the
preset outlet temperature of the water heater. If Rheem controllers are not installed,
the water heater defaults to the preset outlet temperature. Other manufacturers’
controllers cannot be installed with this water heater.
TEMPERATURE ADJUSTMENT
● 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 Kitchen controller is 60oC and for the
Bathroom controllers is 50oC.
● Each press of the up (▲) button will increase the temperature setting by one
increment.
● Pressing the up (▲) button continuously will scroll the temperature setting up to
a maximum 43oC if hot water is flowing or 45oC if no hot water is flowing.
● The temperature setting cannot be increased above 43oC whilst hot water is
flowing.
● From the 45oC setting, the up (▲) button must be pressed once for each increase
in increment.
● The minimum temperature setting for each type of controller is 37oC.
● Each press of the down (▼) button will decrease the temperature setting by one
increment.
● Pressing the down (▼) button continuously will scroll down the temperature setting.
● The temperature setting can be decreased from any temperature setting whether
the hot water is flowing or not.

8
TEMPERATURE CONTROL
FUNCTIONS OF ALL CONTROLLERS
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. The
light in the button will glow when the controller is on. 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.
priority light – This light will glow on a controller when that controller has priority.
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 on page 7).
▼(down button) –The down button decreases the temperature setting (refer to
Temperature Adjustment on page 7).
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 on page 12).
SILENCING A CONTROLLER
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 if you wish to
deactivate the sound on the other controllers. To restore the sound, repeat this
procedure.

9
TEMPERATURE CONTROL
BATHROOM CONTROLLER
KITCHEN CONTROLLER

10
KITCHEN CONTROLLER
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 maximum temperature setting
of 60ºC and a minimum temperature setting of 37
o
C. The Kitchen controller does
not have priority if a Bathroom controller is on.
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. See notes below.
2. Turn on the Kitchen controller by
pressing the on/off button.
The light in the on/off button and the priority
light will both glow. The Kitchen controller
temperature setting will be displayed. This
is the lower of the previous setting and 50°C.
3. Select the temperature setting by
pressing the up (▲) button or down
(▼ ) button.
Refer to Temperature Adjustment on page
7. 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.
6. Turn off the Kitchen controller by
pressing the on/off button.
The priority light, on/off light and temperature
display will go out.
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 11.
Notes 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.
● The controller cannot be turned on whilst a hot tap is open.
● The Kitchen controller must have priority in order to adjust the temperature setting
on the Kitchen controller.
TEMPERATURE CONTROL
in use
in use
on
off
on
off
priority
priority
C
C
C
in use priority

11
TEMPERATURE CONTROL
BATHROOM CONTROLLERS
The Bathroom controller/s allow the user to select the temperature setting for the hot
water to be used in the bathroom. It has a maximum temperature setting of 50
o
C and a
minimum temperature setting of 37
o
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 and gain priority before
opening a hot tap in the bathroom. If the Kitchen controller is on and 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 50
o
C if a temperature limiting device is installed
in the hot pipe to the bathroom or up to 60
o
C if a temperature limiting device is not
installed.
To operate a Bathroom controller:
1. Turn on the Bathroom controller by pressing the
on/off button.
The light in the on/off button and the priority light will both
glow. The temperature setting of 40
o
C will be displayed.
2. Select the temperature setting by pressing the up
button ( ▲ ) or down ( ▼ ) button.
Refer to Temperature Adjustment on page 7. The selected
temperature setting will be displayed on all controllers.
3. Open the hot tap.
The in use light will glow on all controllers.
4. Close the hot tap.
The in use light will go out on all controllers.
It is advised not to turn off the Bathroom controller/s at
the Bathroom controller. Refer to the warning in the notes
below.
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 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.
● The Bathroom controller must be on in order to adjust the temperature setting on the
Bathroom controller.
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 50ºC. If a hot tap is open in another bathroom, the
water will be delivered at this temperature.
on
off
in use priority
C
in use priority
C
in use priority
C

12
TEMPERATURE CONTROL
WATER VOLUME FUNCTION
The function provided by the water volume button and alarm is 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.
Operation
To use the water volume alarm:
1. Press the water volume button.
The light in the water volume button 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
light will start to flash and the selected water volume is set. The water volume
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. Turn on the controller for the room where the hot water is to be used, gain priority
and select the temperature setting.
4. Open the hot tap to draw hot water.
Measurement of the water flow at the water heater will commence when the
water volume light is flashing and a hot tap is open.
The alarm will sound when the set volume of water has passed through the
water heater.
5. Press the water volume button to turn off the alarm.
The water volume 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.

13
TEMPERATURE CONTROL
Notes:
● 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 factory preset water volume is 180 litres.
● If a hot water 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 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.
C
C
water
volume
water
volume
on
off
x10L
in use priority
in use priority
in use priority
C

14
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 Warranty on page 28).
NO DISPLAY ON THE CONTROLLER
● Is the controller turned on? Press the on/off button (refer to Temperature Control
on pages 7 to 13).
● Is the water heater plugged in and the power outlet switched on?
● Is power available in the house? Try using another electrical appliance.
COLD WATER FROM HOT TAP
● Is the controller turned on? Press the on/
off button (refer to Temperature Control on
pages 7 to 13).
● Close the hot tap, wait 10 seconds and
open the hot tap again.
● Is the hot tap open enough? The burners
will not light if the flow rate is less than 3 L/
min.
● Is the water heater plugged in and the
power outlet switched on?
● Is power available in the house? Try using
another electrical appliance.
● 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 TOO HOT OR NOT HOT ENOUGH
● Does the controller you are using have priority? (refer to Temperature Control
on pages 7 to 13)
NO WATER FROM HOT TAP
This 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 18) is fully open.
WATER FLOW FLUCTUATES
Are there other hot taps open, or appliances such as a dishwasher or washing
machine, in use at the time? The shower should be adjusted so the hot tap is fully
open. To check the flow of the water, ensure only one hot tap (or appliance) is on at
one time. More than two hot taps in use at the same time may cause a decrease in
the hot water flow from the taps.
FAN CONTINUES TO RUN AFTER WATER HEATER OPERATION HAS STOPPED
This is normal operation. The fan may run for up to six minutes after the burners
extinguish, to prepare for the next ignition.

15
SAVE A SERVICE CALL
CLOUDS OF WHITE ‘SMOKE’ FROM FLUE
TERMINAL
When the burner is operating, it is not unusual to see
water vapour clouds steaming from the flue terminal,
particularly on cold 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.
A small volume of water may discharge from the bottom
of the water heater when a hot tap is suddenly closed.
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 Water Supply on page 17).
HIGH GAS BILLS
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.
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 controller/s (if installed) and
on the front of the water heater on the OK MONITOR.
If an error code appears:
1. Close the hot tap, turn off the controllers and switch
off the power to the water heater.
2. Wait 5 minutes, then switch on the power to the water
heater, turn on a controller and open a hot tap.
If the error code persists, turn off the hot tap and turn off
the controller. Take note of the code and phone
Southcorp Water Heaters Australia or their Accredited
Service Agent for service.

16
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 available (refer to the rating
label on the water heater ).
WATER HEATER LOCATION
This water heater is an outdoor model and must be mounted on a vertical wall. It
must not be installed indoors or in a confined space. The water heater 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 hot
water outlet or 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. Ensure the entire front panel
can be removed for service. Remember, the entire water heater may have to be
removed later for servicing. The water heater dimensions are shown on page 18.
The installation must comply with these installation instructions and with the
requirements of AS/NZS 3500.4, AS 5601/AG 601 and any other statutory
requirements. In New Zealand, the installation must conform to NZS 5261 Code of
Practice for Installation of Gas Appliances and the New Zealand Building Code.
As a guide the following requirements extracted from AS 5601/AG 601 are to be
observed.
● At least 300 mm between the top of the water
heater and the eaves.
● At least 500 mm horizontally between the water
heater and the edge of any opening into the
building.
● At least 300 mm between the water heater and
a return wall or external corner, measured
horizontally along the wall.
● At least 1500 mm below any openable window.
● At least 1500 mm between the water heater
and any opening into a building, in the direction
of the flue discharge.
FITTING THE WATER HEATER
Mount the water heater on the wall using suitable
hanging screws, two each at the top and bottom
of the unit (refer to page 18 for mounting hole
positions).
The water heater must be installed vertically with
the water, gas and power connections on the
underside, pointing toward the ground.

17
INSTALLATION - WATER HEATER
FLUEING
This water heater does not require additional flueing. A secondary flue must not be
installed.
FROST PROTECTION
The water heater may have frost protection. Refer to the rating label on the water
heater. 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
occurring. Models without frost protection are not covered under warranty for damage
caused by freezing and must not be installed in areas subject to frost conditions.
The frost protection system will be rendered inoperable if electrical power is not
available at the water heater. Damage to the water heater caused by freezing of the
pipework to or from the water heater is not covered under warranty. Refer to AS/
NZS 3500 for precautions to be taken for installations in frost prone areas. The
water heater is not suitable for installation in areas where the ambient temperature
falls below -20ºC (including wind chill factor).
WATER SUPPLY
Where the water supply pressure exceeds that shown below, an approved pressure
limiting valve is required and should be fitted as shown in the installation diagram
(refer to page 18).
Notes:
● It is not recommended to install this water heater with a low pressure water
supply.
● This water heater is not suitable for connection to bore water or spring water
unless a water treatment device is fitted.
● If sludge or foreign matter is present in the water supply, it is recommended a
suitable filter be incorporated in the cold water supply pipe to the water heater.
● Refer to Water Supplies on page 27.
HOT WATER DELIVERY
The delivery water temperature requirements of AS/NZS 3500.4 must be considered.
We recommend and it may also be required by regulations, that a temperature limiting
device be fitted for any ablution area, such as a bathroom or ensuite.
* minimum water supply pressure required to
achieve the rated flow and performance.
Model Water Pressure kPa
Maximum Minimum *
18
20
24
1000
1000
1000
140
140
140

18
WATER AND GAS CONNECTION DETAIL
HOT WATER OUTLET
Provide a union for disconnection.
Insulate pipe.
COLD WATER INLET
The cold water supply pipe is to be
fitted with an approved gate or ball
valve and union.
PIPE INSULATION
Adequate insulation is required on
the cold and hot pipes, to the
underside of the water heater, in
frost prone areas (refer to AS/NZS
3500).
GAS INLET
The gas supply pipe is to be fitted
with an isolation valve and union.
DIMENSIONS
Hot water
Power
cord
Pressure
limiting valve
(where required) Gate valve
or ball valve
Gas
Gas cock
Cold water
Bathroom Controller
Kitchen Controller

19
CONNECTIONS - PLUMBING
CONNECTION SIZES
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.
● Care should be taken not to twist the water inlet and outlet pipes inside the jacket.
● All pipes should be well flushed before connections are made.
HOT WATER OUTLET
For the position of the hot water outlet, refer to page 18. A disconnection union must
be provided. Insulation used on the hot pipe must extend up to the hot water outlet of
the water heater. The hot water pipe runs should be as short as possible to service
the outlets. The hot water pipe should be sized to ensure adequate hot water flow to
all outlets. The recommended pipe size is DN20.
COLD WATER INLET
An approved gate valve or ball valve and disconnection union must be fitted on the
cold water supply pipe before the water heater (refer to page 18). Do not fit a non-
return valve or stop cock. The cold water supply pipe should be sized to ensure
adequate flow. The recommended pipe size is DN20.
GAS INLET
The pipe work must be cleared of foreign matter before connection and purged before
attempting to operate the water heater. An isolation valve and disconnection union
must be used to allow for servicing and removal of the water heater. Refer to the AGA
Gas Installation Code for the correct pipe sizing.
Note: The pipe size selection must take into account the high gas input of this water
heater (refer to table on page 19) as well as all of the other gas appliances in the
premises.
The water heater is supplied with a 1.8 metre lead and plug and requires a 240 volt,
50 Hertz electricity supply. A weatherproof power point is required. The power point
must be clear of the flue exhaust, draining water, gas supply pipe and water
connections.
Model 871 018 871 020 871 024
Hot Water Connection R 1/2/15 R 3/4/20 R 3/4/20
Cold Water Connection R 1/2/15 R 3/4/20 R 3/4/20
Gas Connection R 3/4/20 R 3/4/20 R 3/4/20
Thermal Input (MJ) 157 157 188
Weight (kg) 20 20 21
CONNECTIONS - ELECTRICAL

20
COMMISSIONING
All water heaters are tested and adjusted before dispatch, however further
adjustments may become necessary because of local conditions.
TO TURN ON THE WATER HEATER
Open all of the hot taps in the house (don’t forget the shower). Open the cold water
isolation valve fully. Air will be forced out of the taps. As water flows freely from each
tap, close it.
Open the gas isolation valve fully. Plug the water heater in and switch the power
outlet on. The water heater will now operate when a hot tap is opened.
Check to ensure the flow from each connected hot tap is sufficient to operate the
water heater. The minimum operating flow rate for all models is 3 litres per minute.
The automatic water governor incorporated in the water heater is not adjustable.
GAS INLET PRESSURE
IMPORTANT - CHECK the gas supply pressure at the inlet to the water heater with
the water heater and all other gas burning appliances in the premises operating
(burners alight). The minimum gas supply pressures are:
Natural Gas 1.13 kPa Propane 2.75 kPa.
If this minimum cannot be achieved, it may indicate the meter or the supply pipe to
the water heater is undersized.
BURNER GAS PRESSURE
It is necessary to check the burner gas pressure at both the minimum and maximum
operational settings. The hot water must be flowing and the burners on to check and
if necessary adjust the operational gas pressures.
● Ensure the burners are not operating. Close any hot taps and turn off the gas
supply at the gas isolation valve.
● Remove the screws holding the front panel to the jacket.
● Gently disengage the front panel and pull forward to disengage from the flue
terminal.
● Locate the burner pressure test point on the main burner manifold and connect a
manometer.
● Turn on the gas supply at the gas isolation valve.