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Summary of Contents for Rheem 874B28
- Page 1 Owner’s Guide Installation Instructions Continuous Flow Gas Water Heater 874, 876 series B28 models This water heater must be installed and serviced by a qualified person. Please leave this guide with the householder.
- Page 2 An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded from rheem.com.au. Rheem Australia Pty Ltd is the supplier of the Rheem range of gas continuous flow water heaters, manufactured in Japan by Paloma Co., Ltd., a world leader in water heater technology and manufacture.
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Page 3: Table Of Contents
Rheem warranty. We recommend you read pages 7 to 19, and the terms of the Rheem warranty on pages 4 to 6. The other pages are intended for the installer but may be of interest. -
Page 4: Warranty
The decision of whether to repair or replace a faulty component is at Rheem’s sole discretion. If you require a call out and we find that the fault is not covered by the Rheem warranty, you are responsible for our standard call out charge. If you wish to have the relevant component repaired or replaced by Rheem, that service will be at your cost. -
Page 5: What Is Covered By The Rheem Warranty For The Water Heaters Detailed In This Document
3. WHAT IS COVERED BY THE RHEEM WARRANTY FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT Rheem will repair or replace a faulty component of your water heater if it fails to operate in accordance with its specifications as follows:... -
Page 6: Entitlement To Make A Claim Under This Warranty
The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the Australian Consumer Law. -
Page 7: Safety, Warnings, Installation Notes
The Rheem warranty may not cover faults if safety devices or the relief valve are tampered with or if the installation is not in accordance with these instructions. - Page 8 SAFETY, WARNINGS, INSTALLATION NOTES • Do not spray aerosols in the vicinity of this water heater while it is in operation. Propellants and gases in many aerosol sprays contain hydrocarbons which are flammable. Gases from aerosol sprays may also become corrosive when drawn into a flame. •...
- Page 9 Alternatively, the water heater can be installed recessed into a wall, using a proprietary made recess box from Rheem for such an installation. Refer to the installation instructions which accompany the recess box kit for the dimensions of the space required and information on its installation.
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Page 10: About Your Water Heater
USER TEMPERATURE CONTROL Temperature Controllers The Rheem 874 and 876 series may be installed with one or more user adjustable Standard temperature controllers, which allow you to choose the most suitable water temperature of the delivered water from the outlet of the water heater for your hot water needs. They are the Kitchen controller, Bathroom 1 controller and the Bathroom 2 controller. -
Page 11: How Hot Should The Water Be
Note: temperature setting 874 series cannot be adjusted by the householder. The setting can only be adjusted by the installer, Rheem Service or their nearest Accredited Service Agent. Note: Australian Standard AS 3498 requires that a water maximum recommended supply... -
Page 12: Gas Boosting For A Solar Water Heater
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 “Terms of the Rheem Warranty” by the Rheem warranty (refer to on page 4). •... -
Page 13: Hot Water Outlet
ABOUT YOUR WATER HEATER TO TURN OFF THE WATER HEATER If it is necessary to turn off the water heater: • Turn off the controller(s) (if fitted) by pressing the on / off ( ) button. The on / off operating light will go out and the priority light, if it is on, will go out. •... - Page 14 ABOUT YOUR WATER HEATER CIRCULATED HOT WATER FLOW AND RETURN SYSTEM A Rheem 874B28 model continuous flow water heater can be installed as part of a circulated hot water flow “Circulated Hot Water Flow and Return System” and return system in a building. Refer to on page 25 for further information and notes on this type of installation.
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Page 15: Maintenance Requirements
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. -
Page 16: Change Of Water Supply
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. -
Page 17: Water Is Too Hot Or Not Hot Enough
Check the items below before making a service call. You will be charged for attending to any condition or fault, °C “Terms of the Rheem Warranty” which is not related to manufacture or failure of a part (refer to on page 4). -
Page 18: Water Flow Fluctuates
• Collector area is too small For most installations, the number of solar collectors recommended in Rheem literature has been proven to provide the required solar energy to meet the average family needs. However, in some circumstances, it may be necessary to install an additional solar collector. - Page 19 If the error code persists, take note of the numerical code, turn off the hot tap and turn off the controller(s). Phone Rheem Service or their nearest Accredited Service Agent to arrange for inspection.
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Page 20: Installation - Water Heater
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: •... -
Page 21: Water Heater Location
INSTALLATION – WATER HEATER 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. If this water heater is part of a solar water heater system, it should also be installed close to the solar storage tank. -
Page 22: Recess Installation
Figure and Table 6.9.3. RECESS INSTALLATION The water heater can be installed recessed into a wall. A recess box (Rheem Part Number 140341 or for WA PN 140331) is available for such an installation. Refer to the installation instructions which accompany the recess box kit for information on its installation. -
Page 23: Hot Water Delivery
INSTALLATION – WATER HEATER HOT WATER DELIVERY Warning: This water heater can deliver water at temperatures which can cause scalding. 876 series – 50°C Limited Outlet An 876 series water heater delivers water not exceeding 50°C in accordance with AS 3498. The risk of scald injury will be reduced. - Page 24 INSTALLATION – WATER HEATER Gas Booster for a Solar Water Heater The temperature limiting device used with an 874 series in-series gas booster as part of a solar water heater installation must be of a type suitable for use with both a continuous flow water heater and a solar water heater. Refer to the manufacturer’s specifications of the temperature limiting device.
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Page 25: Circulated Hot Water Flow And Return System
INSTALLATION – WATER HEATER CIRCULATED HOT WATER FLOW AND RETURN SYSTEM A Rheem 874B28 model continuous flow water heater can be installed as part of a circulated hot water flow and return system in a building. Notes • the preset outlet temperature setting of the water heater must be set to at least 60°C. - Page 26 INSTALLATION – WATER HEATER Circulated Hot Water Flow and Return – Gas Continuous Flow Water Heater Circulated Hot Water Flow and Return – In-series Gas Booster as part of a Solar Water Heater Installation...
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Page 27: Temperature Controllers
UV resistant if exposed. TEMPERATURE CONTROLLERS The Rheem 874 and 876 series can be installed with Rheem Standard controllers to enable the user to control the temperature of the delivered water from the outlet of the water heater. There are three types of Standard controller. They are the Kitchen controller, Bathroom 1 controller and the Bathroom 2 controller. -
Page 28: Water Temperature Diagrams
INSTALLATION – WATER HEATER WATER TEMPERATURE DIAGRAMS 874 Series - Kitchen and Bathroom Controllers 876 Series – Kitchen and Bathroom Controllers 874 Series - Kitchen Controller Only 876 Series - Kitchen Controller Only 874 Series - Bathroom Controllers Only 876 Series - Bathroom Controllers Only 874 Series - No Controllers 876 Series - No Controllers Notes... -
Page 29: Dimensions And Technical Data
INSTALLATION – WATER HEATER DIMENSIONS AND TECHNICAL DATA 874B28 876B28 Model Natural, Propane Water heating capacity litres / min 17.5 @ 40°C rise Nominal capacity litres / min @ 25°C rise Mass Empty (unpackaged) Technical data is subject to change. -
Page 30: Typical Installation - Outdoor Location
INSTALLATION – WATER HEATER TYPICAL INSTALLATION – OUTDOOR LOCATION... -
Page 31: Connection Sizes
This damage to components or blockage of filters is not covered by the Rheem warranty and a service rectification fee will be charged. A full flow gate valve or ball valve must be installed on the cold water line to the water heater. -
Page 32: Pipe Sizes
Warning: Always isolate the water heater before pressure testing the gas supply system. Disconnect the water heater after the isolation valve to prevent the risk of serious damage to the gas control. The Rheem warranty does not cover damage of any nature resulting from failure to observe this precaution. Refer to rating... -
Page 33: Connections - Electrical
Power Comments Models consumption < 1 Watt Burner off, anti-frost device inactive 874B28 and 876B28 models natural gas and propane gas 95 Watts Burner off, anti-frost device active @ 220 V – 240 V a.c. 50 Hz 67 Watts Burner on, anti-frost device inactive The water heater will only operate on a sine wave at 50 Hz. -
Page 34: Wiring Diagram
CONNECTIONS – ELECTRICAL WIRING DIAGRAM Wiring Diagram – 874, 876 Series B28 Models... -
Page 35: Ez Link System Dual Installation
The second water heater will only operate when the hot water demand exceeds the capacity of the first water heater to supply. The EZ Link system is suitable for installation with Rheem 874 and 876 series B28 model gas continuous flow water heaters. The EZ Link Kit PN 299291 is required for the installation. -
Page 36: Temperature Controller
EZ LINK SYSTEM DUAL INSTALLATION DUAL INSTALLATION The two water heaters can be installed side by side with minimal clearance between them. Rheem 874 and 876 series B28 models are certified for installation with an exemption from the 300 mm minimum clearance requirements between flue terminals, as stated in AS/NZS 5601.1 clause 6.9.3. - Page 37 EZ LINK SYSTEM DUAL INSTALLATION EZ LINK CABLE CONNECTION ‘Control Board with EZ Link Connection’ The references in steps 6 to 9 are to the diagram on page 38. To connect the EZ Link cable to the water heaters: Close any hot taps and ensure the burners on both water heaters are not operating. Switch off the electrical supply at the power outlet to each water heater.
- Page 38 EZ LINK SYSTEM DUAL INSTALLATION Carefully replace the plastic protective cover over the front of the PCB board to each water heater. Secure in position by engaging the three spigots in the PCB support housing through the three holes in the protective cover’s top side and right side.
- Page 39 EZ LINK SYSTEM DUAL INSTALLATION Typical Two Unit Manifold with EZ Link Connection...
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Page 40: To Turn On The Water Heater
COMMISSIONING All water heaters are tested and adjusted before dispatch from the factory, 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). •... - Page 41 COMMISSIONING Gas Inlet Test Point Pressure To check the gas inlet pressure: Close any hot taps and ensure the burners are not operating. Close the gas isolation valve at the gas inlet to the water heater. Locate the gas inlet test point on the gas connection to the water heater.
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Page 42: Burner Gas Pressure
COMMISSIONING BURNER GAS PRESSURE It is necessary to check the burner gas pressure at both the minimum and maximum operational settings. To check and if necessary adjust the operational gas pressures, the electrical supply to the water heater must be switched on, the burners ignited and hot water must be flowing from a hot tap. - Page 43 COMMISSIONING While the MIN button is pressed, the gas pressure will at first increase then decrease, cycling Note: between an upper gas pressure limit (59 on the LED display) and a lower gas pressure limit (01 on the LED display). Release the MIN button when the reading on the manometer agrees with the rating label.
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Page 44: Preset Outlet Temperature Setting
COMMISSIONING PRESET OUTLET TEMPERATURE SETTING The factory preset outlet temperature setting of the water heater is: • 874 series 60°C • 876 series 50°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: Maximum Outlet Temperature 874 series... - Page 45 COMMISSIONING Warning: The removal of the front panel will expose 220 - 240 V a.c. wiring. Take care not to touch wiring terminals. The adjustment must be carried out by a qualified person. Warning: This procedure will involve the adjustment of dip switches and may involve the pressing of the MIN and MAX buttons.
- Page 46 COMMISSIONING OUTLET TEMPERATURE COMPENSATION ADJUSTMENT The outlet temperature compensation adjustment function is only applicable to: • 876 series B28 water heaters The maximum outlet temperature may be adjusted to compensate for temperature losses in the pipe work between the water heater outlet and fixtures used primarily for personal hygiene. This procedure cannot be conducted on an 874 series water heater.
- Page 47 COMMISSIONING Outlet Temperature Adjustment To adjust the outlet temperature: Switch on the electrical supply at the power outlet to the water heater. Locate the first hot tap in the hot water pipe work after the water heater used primarily for personal hygiene. Turn on the hot tap.
- Page 48 COMMISSIONING 14. Press the MAX button once to increase the outlet temperature setting to the next increment. The MAX button is located to the left of the DIP 1 and DIP 2 set of DIP switches and in between the MIN (top) and Adjuster (bottom) buttons.
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Page 49: Draining The Water Heater
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 “Terms of the Rheem Warranty” Rheem warranty (refer to on page 4). •... - Page 50 This page is intentionally blank.
- Page 51 This page is intentionally blank.
- Page 52 Revision Date: 2024 April (41-41373-00) 122356 Rev-01...
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