Rheem 874627PF Installation and Operation Guide
Owner’s Guide
and
Installation Instructions
Continuous Flow
Gas Water Heater
872 series
627 models
This water heater must be installed and serviced by a qualified person.
Please leave this guide with a responsible officer.
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.
PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd or Paloma Co., Ltd.
Rheem Australia Pty Ltd is the supplier of the Rheem range of continuous flow gas water heaters,
manufactured by Paloma Co., Ltd., a world leader in water heater technology and manufacture.
®
Registered 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.
™ Trademark of Rheem Australia Pty Ltd.
TRADEMARKS
CONTENTS
RESPONSIBLE OFFICER - We recommend you read pages 4 to 14.
The other pages are intended for the installer but may be of interest.
About Your Water Heater ............................................................................................................ 4
Water Supplies ........................................................................................................................... 11
Save A Service Call ................................................................................................................... 12
Installation – Water Heater ....................................................................................................... 15
Connections – Plumbing .......................................................................................................... 25
Connections – Electrical ........................................................................................................... 27
Multiple Installations ................................................................................................................. 28
Commissioning .......................................................................................................................... 31
Draining The Water Heater ....................................................................................................... 37
Warranty ..................................................................................................................................... 39
3
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water. Its use in an application other than
this may shorten its life.
MODEL TYPE
The Rheem® continuous flow gas water heater model you have chosen is for outdoor installation only. This
model has an extended manufacturer’s warranty (refer to the Rheem warranty on page 39).
The water heater has a maximum preset outlet temperature setting of:
872 series 82°C
If a temperature controller is connected to the water heater, this will
override the preset outlet temperature setting and the maximum
temperature setting will be:
Kitchen controller connected 60°C
Bathroom controller only connected 50°C
WATER HEATER OPERATION
The water heater operates automatically, heating water as it passes
through the water heater. When a hot tap is opened, the gas burners
ignite to provide immediate heating of the water. The heat produced by
the burner is transferred to the water through the heat exchanger. The
water is heated to a constant temperature by the automatic adjustment
of the gas supply to the burner to suit the water flow rate. 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.
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.
GAS BOOSTING FOR A SOLAR WATER HEATER
The 872 series water heater may be installed as an in-series gas booster to a solar water heater. For
information relating to the function and operation of the solar water heater, refer to the Owner’s Guide and
Installation Instructions supplied with the solar water heater.
Water stored in the solar storage tank passes through the in-series gas booster when a hot tap is opened.
Solar heated water can reach temperatures up to 70°C to 80°C for a Premier Loline and Loline pumped
system and a Hiline thermosiphon system and possibly higher for a Premier Hiline thermosiphon system.
The in-series gas booster is for heating water at times of low solar energy gain, such as during cloudy or
rainy weather, or during colder months. The in-series gas booster operates automatically.
When the solar heated water is at a temperature higher than 2°C below a water heater preset outlet
temperature setting of up to 75°C (i.e. 68°C or above if the preset outlet temperature setting is 70°C) or
higher than 4°C below a water heater preset outlet temperature setting of 82°C, the flow passes through the
in-series gas booster without boosting. When the solar heated water is at a temperature lower than 2°C
below a water heater preset outlet temperature setting of up to 75°C (i.e. below 68°C if the preset outlet
temperature setting is 70°C) or lower than 4°C below a water heater preset outlet temperature setting of
82°C, the in-series gas booster heats the water to a minimum temperature of the preset outlet temperature
setting.
4
ABOUT YOUR WATER HEATER
maximum preset outlet
temperature setting (82°C)
maximum recommended
supply temperature to
bathrooms, ensuites and
public areas.
minimum recommended preset
outlet temperature setting
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 17, a pressure limiting valve must be fitted. The supply pressure
should be greater than 140 kPa for the rated flow and performance to be achieved.
HOW HOT SHOULD THE WATER BE?
The water heater has a maximum preset outlet temperature setting
of 82°C. For applications requiring sanitising temperatures, the
outlet temperature should be set at 82°C. The minimum
recommended preset outlet temperature setting is 60°C.
If the water heater is installed as part of a circulated hot water flow
and return system in a building, the preset outlet temperature setting
of the water heater must be set to at least 60°C.
If a controller is not installed, the water heater heats the water to the
preset outlet temperature setting. The factory preset outlet
temperature setting is:
872 series 60°C for a single water heater
60°C as part of a Multipak® system
70°C as part of a Commpak® system
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.
Note: AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. When this water heater is used as an in-series booster for a solar water heater it can satisfy
this AS 3498 requirement provided it is energised, the booster preset outlet temperature setting is 70°C or
higher, and that a remote temperature controller is not used.
Warning: Temperature controllers must not be fitted to this water heater (872 series) if it is installed as
an in-series gas booster with a solar water heater system or if a Water Star water heater is installed,
because water at a temperature much higher than the controller setting can be delivered. If a solar or
Water Star water heater is installed to an existing water heater installation, then all controllers must be
disconnected and removed.
If this water heater is installed as part of a solar water heater system, the system can deliver water at
temperatures from 58°C up to 80°C and possibly higher depending upon the model of solar water heater
installed.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can cause scalding. Check the water temperature
before use, such as when entering a shower or filling a bath or basin, to ensure it is suitable for the
application and will not cause scald injury.
We recommend and it may be required by regulations that an approved temperature limiting device be fitted
into the hot water piping to ablution, bathing and public areas when an 872 series water heater is installed.
This will keep the water temperature below the maximum permitted by AS/NZS 3500.4 to these areas. The
risk of scald injury will be reduced and if no controllers are installed and the preset outlet temperature setting
has not been adjusted below 55°C or if a Kitchen controller is installed, still allow hotter water to the kitchen,
laundry and other areas requiring sanitising temperatures.
5
ABOUT YOUR WATER HEATER
SAFETY
This water heater is supplied with temperature sensors, a FlameSafe® protection system and a pressure
relief valve. These devices must not be tampered with or removed. The water heater must not be operated
unless each of these devices is fitted and is in working order.
If the power supply cord or plug is damaged, it must be replaced by a qualified person in order to avoid a
hazard. The power supply cord and plug must be replaced with a genuine replacement part available from
Rheem. Phone Rheem Service or their nearest Accredited Service Agent to arrange for an inspection.
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.
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.
The water heater uses 240 Volt AC electrical power for operation of the control systems and the
combustion fan. The removal of the front panel will expose 240 V wiring. It must only be removed by a
qualified person.
The power lead from the water heater must be plugged into a weatherproof electrical outlet. Take care
not to touch the power plug with wet hands.
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 7, “Minor Maintenance Every Six Months” on page 7 and “Service
Every Twelve Months” 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.
6
ABOUT YOUR WATER HEATER
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.
MINOR MAINTENANCE EVERY SIX MONTHS
It is recommended minor maintenance be performed every six (6) months. Minor maintenance can be
performed by the dwelling occupant.
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.
SERVICE EVERY TWELVE MONTHS
For safe and efficient operation, it is recommended a service be conducted on the water heater every
twelve (12) months.
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 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 service includes the following actions:
Check and if necessary adjust the gas pressure.
Check the operation of and clean the burner.
Check and clean the line strainer.
Visually check the unit for any potential problems.
Inspect all connections.
7
ABOUT YOUR WATER HEATER
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
A Rheem 872 627 model continuous flow water heater can be installed as part of a circulated hot water flow
and return system in a building. Refer to “Circulated Hot Water Flow and Return System” on page 21 for
further information and notes on this type of installation.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
Turn off the controllers(s) (if fitted) by pressing the on / off button.
The light in the on / off button will go out and the priority light (standard controller) or the ACTIVE light
(Deluxe controller), if it is on, will go out.
Switch off the electrical supply at the power outlet to the water heater if there is no risk of freezing
conditions occurring (refer to note below).
Close the gas isolation valve at the inlet to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off unless the water heater is drained, otherwise damage could result (refer to “Frost Protection” on page 9
and “Draining the Water Heater” on page 9).
TO TURN ON THE WATER HEATER
Screw in the drain plugs at the cold water inlet and hot water outlet of the water heater if the water
heater has been drained.
Open all of the hot taps in the house (don’t forget the shower).
Open the cold water isolation valve fully at the inlet to the water heater.
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Open the gas isolation valve fully at the inlet to the water heater.
Plug in the power supply cord at the power outlet.
Switch on the electrical supply at the power outlet to the water heater.
Turn on a controller, if one is fitted, by pressing the on / off button.
The light in the on / off button and the priority light (standard controller) or ACTIVE light (Deluxe
controller) will both glow.
The water heater will operate automatically when you open a hot tap.
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 8.
8
ABOUT YOUR WATER HEATER
FROST PROTECTION
The water heater has a frost protection system. The frost protection system will protect the water heater from
damage, by preventing ice forming in the waterways of the water heater, in the event of freezing conditions
occurring.
Notes:
The frost protection system will be rendered inoperable if electrical power is not available at the water
heater. Damage caused by freezing due to the unavailability of power at the water heater is not covered
by the Rheem warranty (refer to “Terms of the Rheem Warranty” on page 39).
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 9).
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 -20°C
(including wind chill factor).
Refer to “Terms of the Rheem Warranty” on page 39.
DRAINING THE WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater” on page 8).
Open a hot tap (preferably the shower outlet).
Unscrew the two drain plugs, one each at the cold water inlet and hot water outlet, on the underside of
the water heater.
Water will drain from the water heater.
When water stops flowing from the water heater, close the hot tap.
Note: It is recommended not to screw the drain plugs back in, until the water heater is to be turned on again.
9
ABOUT YOUR WATER HEATER
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 15 to 24. 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.
The Gas installations Standards AS 5601 and AS/NZS 5601.1 place limitations on the location of a gas
water heater within a covered area. Refer to “Installation within a Covered Area” on page 17.
Warning: Temperature controllers must not be fitted to this water heater (872 series) if it is installed as
an in-series gas booster with a solar water heater system or if a Water Star water heater is installed,
because water at a temperature much higher than the controller setting can be delivered. If a solar or
Water Star water heater is installed to an existing water heater installation, then all controllers must be
disconnected and removed.
The pipe work between the solar storage tank (if one is installed) and the in-series gas booster has a
minimum recommended pipe size of DN20, MUST BE of copper or other metal material suitable for potable
water and be fully insulated in accordance with the requirements of AS/NZS 3500.4. The insulation must be
weatherproof and UV resistant if exposed. The insulation must be fitted up to the connections on both the
solar storage tank and the in-series gas booster.
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 11.
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 11.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer’s warranty (refer to page 39). 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
+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
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 a continuous flow 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 a continuous flow 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 11.
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 39).
NO DISPLAY ON THE CONTROLLER (IF FITTED)
Is the controller turned on?
Press the on / off button.
Is the water heater plugged in and the power outlet switched on?
Is power available in the premises?
Try using another electrical appliance.
COLD WATER FROM THE HOT TAP
Is the controller turned on?
Press the on / off button.
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 2.0 L / min.
Is the water heater plugged in and the power outlet switched on?
Is power available in the premises?
Try using another electrical appliance.
Is the isolation valve in the gas line open?
Is there a gas supply to the rest of the premises?
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
Is the preset outlet temperature of the water heater higher than required?
Does the controller you are using have priority?
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.
WATER FLOW FLUCTUATES
More than two or three taps in use at the same time may cause a decrease in the hot water flow from the
taps. This can also be evident if the water heater has been installed as an in-series gas booster to a solar
water heater and the solar heated water is at a low temperature.
Are there more than two or three taps open, or are appliances such as a dishwasher or washing
machine, in use at the same time?
Ensure only two or three taps or appliances are on at the one time.
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.
12
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