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Summary of Contents for Rheem MDC-180
- Page 1 Owner’s Guide Installation Instructions Air Sourced 551180 Heat Pump Water Heater This water heater must be installed and serviced by a qualified person. Please leave this guide with the householder.
- Page 2 TRADE MARKS ® Registered trademark of Rheem Australia Pty Ltd and / or Rheem New Zealand Limited. ™ Trademark of Rheem Australia Pty Ltd and / or Rheem New Zealand Limited. Note: Every care has been taken to ensure accuracy in preparation of this publication.
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Page 3: Table Of Contents
Rheem warranty. We recommend you read pages 8 to 31, and the terms of the Rheem warranty on pages 4 to 7. 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 Rotorua, where high levels of atmospheric Sulphur Dioxide are present in the atmosphere. Rheem may reject a claim under this warranty in its sole discretion if a third party solar diverter is connected to the water heater.
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Page 6: 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 7: How To Make A Claim Under This Warranty
You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. The Rheem warranty (set out above) is in addition to any rights and remedies that you may have under the Australian Consumer Law. -
Page 8: Safety, Warnings, Installation Notes
If the electrical supply conduit to the water heater is damaged, it must be replaced by a qualified person in order to avoid a hazard. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. -
Page 9: Relief Valves
SAFETY, WARNINGS, INSTALLATION NOTES • In areas where there is a risk of freezing conditions, power must be available to the water heater at all times and the electrical supply to the water heater should not be switched off, otherwise damage could result. -
Page 10: Installation Notes
If water does not flow freely from the drain line when the lever is lifted, then the water heater must be checked. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. The temperature pressure relief valve should be replaced at intervals not exceeding five (5) years and the expansion control valve should be checked for performance or replaced at intervals not exceeding five (5) years. -
Page 11: About Your Water Heater
16 hours per day may also be suitable. A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an electricity account will depend on the tariff arrangement of the water heater replaced and where you live. - Page 12 ABOUT YOUR WATER HEATER HOW HOT SHOULD THE WATER BE? The heat pump is designed to operate until a water temperature of 60°C to 70°C is reached, depending upon the Hot Water Temperature maximum temperature set point for heat pump and Set Point.
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Page 13: To Turn Off The Water Heater
ABOUT YOUR WATER HEATER PRECAUTIONS The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions. Refer “Maintenance Requirements” “Anode Inspection and Replacement” on page 24 and to on page 27. 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. - Page 14 At the end of the service life of the heat pump water heater and prior to the water heater being disposed of, a person qualified to work with refrigerants must recover the refrigerant from within the sealed system. The refrigerant must not be vented to atmosphere. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection.
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Page 15: Display Panel
DISPLAY PANEL DISPLAY PANEL AND ICONS The water heater has a Display Panel to allow the user to view the current operational status of the water heater and to enable user input functionality. LEDs on the Display Panel illuminate to display icons when there is power to the water heater and the water heater is turned on at the Display Panel. - Page 16 DISPLAY PANEL Fault Codes In the event the water heater develops a fault, a code will display in the Main Display Area This function of the “Fault Codes” water heater indicates to the user a service call is required. Refer to on page 23.
- Page 17 DISPLAY PANEL DISPLAY ICONS AND SELECTION KEYS EXPLAINED Icon Keys Description On / Off Key: ** used to switch the water heater “On” or “Off” at the Display Panel and to reilluminate the Display Panel fully after it has dimmed. Main Display Area: illuminates either the Average Water Temperature in the water heater or the Hot Water Temperature Set Point in degrees Celsius, depending upon the status of the water heater.
- Page 18 DISPLAY PANEL TURNING THE WATER HEATER “ON” OR “OFF” AT THE DISPLAY PANEL Turn the water heater “On” at the Display Panel • Press the “On / Off” key. The average water temperature in the water heater illuminates in the Main Display Area. The time (if set) illuminates in the Timer / Clock Display Area.
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Page 19: Eco Mode
DISPLAY PANEL ECO MODE The ECO (Energy Conservation Only) Mode is the standard day to day operational and heating mode by the heat pump. This mode allows for the Heat Pump to operate during normal operation when heating is required. The ECO icon illuminates on the Display Panel. -
Page 20: Clock And Timer
DISPLAY PANEL CLOCK AND TIMER The clock and timer functions were introduced to the 180HAV model water heaters manufactured from the January 2024. Clock The water heater has a clock function. The clock must be set in order to use the Timer setting function of the water heater. - Page 21 DISPLAY PANEL To set the Clock Turn the water heater “Off” at the Display Panel. Press the “On / Off” key. ◼ The displays and icons go out. The Display Screen is blank. Note: If the Display Panel is in the ‘dimmed’ state, it will be necessary to press the “On / Off” key twice.
- Page 22 DISPLAY PANEL To set the Timer Set the Timer ON time. If a Timer period is to be set and ‘oF’ is flashing in the Main Display area, then: Press the “Up” key. ➢ ‘oN’ will commence flashing in the Main Display Area. Press the “Mode”...
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Page 23: Fault Codes
If one or more of the above codes is displayed on the Display Panel, make a note of the fault code(s) and phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. FREEZE PROTECTION FUNCTION The water heater has a freeze protection function built in to protect the water heater in extremely cold conditions and the water temperature in the water heater falls to 5°C. -
Page 24: Maintenance Requirements
If water does not flow freely from the drain line of either the temperature relief valve or expansion control valve when the easing lever is operated, phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. -
Page 25: Major Service Every Five Years
Note: The major service and routine replacement of any components, such as the anode and relief valve(s), 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 26: Change Of Water Supply
If an incorrect colour coded anode is used in the water heater, any resultant faults will not be covered by the Rheem warranty. In addition, the use of an incorrect colour coded anode may shorten the life of the water heater cylinder. -
Page 27: Anode Inspection And Replacement
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 sheathed heating unit. An incoloy sheathed heating unit is supplied with this water heater. -
Page 28: Specification
The water heater is not suitable for certain water chemistries. Those chemistries are listed below. If the water heater is connected at any time to a water supply with the following water chemistry, the Rheem warranty will not cover any resultant faults:... -
Page 29: Not Enough Hot Water (Or No Hot Water)
“Fault Codes” If the fault reoccurs, a service call must be made. Refer to on page 23. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. - Page 30 “Fault Codes” water heater. Refer to on page 23. Take note of the fault code and phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection. TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE RUNNING •...
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Page 31: Higher Than Expected Electricity Bills
Contact your energy provider for more information on tariff arrangements and cost comparisons. IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE, PHONE RHEEM SERVICE OR THEIR NEAREST ACCREDITED SERVICE AGENT / CENTRE. -
Page 32: Installation Standards
16 hours per day may also be suitable. A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an electricity account will depend on the tariff arrangement of the water heater replaced and the installation location. -
Page 33: Water Heater Location
INSTALLATION In addition, tilting the water heater more than 30° from the vertical during handling will unsettle the refrigerant gas and compressor lubricating oil. If the water heater has been tilted, it will need one hour to settle before the power to the water heater can be switched on, otherwise damage to the compressor may result. -
Page 34: Mains Water Supply
INSTALLATION MAINS WATER SUPPLY Where the mains water supply pressure exceeds that shown in the table below, an approved pressure limiting valve is required and should be fitted as shown in the cold water connection diagram on page 40. 551180 Model Temperature pressure relief valve setting 1000 kPa... -
Page 35: Saddling - Pipe Work
If an incorrect colour coded anode is used in the water heater, any resultant faults will not be covered by the Rheem warranty. In addition, the use of an incorrect colour coded anode may shorten the life of the water heater cylinder. -
Page 36: Hot Water Delivery
INSTALLATION HOT WATER DELIVERY Warning: This water heater can deliver hot water at temperatures up to 70°C, sufficiently hot to cause severe scalding. Water at this temperature may be plumbed to fixtures where water hotter than 50°C is allowed, such as the kitchen and laundry. The installing plumber may have a legal obligation to ensure the installation of this water heater meets the water temperature delivery requirements of the Plumbing Code of Australia and Clause 12 of the New Zealand Building Code so that heated water delivered to fixtures and appliances used primarily for personal hygiene is... -
Page 37: Dimensions And Technical Data
INSTALLATION DIMENSIONS AND TECHNICAL DATA Dimensions Model 551180 There is a minimum clearance of 80 mm from a wall behind the water heater... - Page 38 INSTALLATION Technical Data 551180 Model number Product number – with black anode (magnesium) 551180C5 Refrigerant type R134a Product number – with blue anode (aluminium) 551180C5/B Refrigerant circuit pressure 2600 kPa Storage capacity litres Refrigerant charge 900 grams Boost capacity litres IP Rating IP24 Weight system...
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Page 39: Typical Installation - Outdoor Location
INSTALLATION Recovery Rate @ 45°C rise L/hr – Is the number of litres of water that can be heated through a 45°C temperature rise in one hour, e.g. when the air temperature is 19°C, the heat pump can heat 60 litres of water from 15°C to 60°C in one hour. -
Page 40: Connection Sizes
CONNECTIONS – PLUMBING All plumbing work must be carried out by a qualified person and in accordance with the Standard AS/NZS 3500.4 and all local codes and regulatory authority requirements. In New Zealand, the installation must also conform to Clauses G12 and H1 of the New Zealand Building Code. CONNECTION SIZES •... -
Page 41: Pipe Sizes
CONNECTIONS – PLUMBING PIPE SIZES 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 pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing the most suitable pipe size for each individual application. -
Page 42: Relief Valve Drain
CONNECTIONS – PLUMBING RELIEF VALVE DRAIN DN15 copper drain lines must be fitted to the temperature pressure relief valve and expansion control valve (if one is installed) to carry the discharge clear of the water heater. Connect the drain lines to the valves using disconnection unions. -
Page 43: Connections - Electrical
CONNECTIONS – ELECTRICAL The power supply to the water heater must not be switched on until the water heater is filled with water and a satisfactory megger reading is obtained. There is NO WARRANTY for the dry firing of the electric heating unit. -
Page 44: Wiring Diagram
CONNECTIONS – ELECTRICAL TIMER A Timer function on the Display Panel allows the hours of operation of the water heater to be set during one “Clock and Timer” timed period in a 24-hour period. Refer to on page 20. If the water heater is set to run during a timed period, the heat pump and the electric heating unit will not operate outside of this timed period. -
Page 45: Commissioning
COMMISSIONING TO FILL AND TURN ON THE WATER HEATER The power supply to the water heater must not be switched on until the water heater is filled with water and a satisfactory megger reading is obtained. • Open all of the hot water taps in the house (don’t forget the shower). •... -
Page 46: Draining The Water Heater
• Damage caused by freezing due to the unavailability of power at the water heater is not covered by the Rheem warranty. “Terms of the Rheem Warranty” Refer to on page 4. • If the power has been switched off to the water heater and there is a risk of freezing, then it is necessary to drain the water heater. - Page 47 This page is intentionally blank.
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Page 49: Installation Report
Off Peak 2 Electric continuous Other (please circle) (night) (night & day) If replacing a water heater, please give details Brand Model No Electric If a Rheem unit Tank Serial No Date of manufacture Collector Serial No’s Comments Signature: Installer: Customer: Date... - Page 50 This page is intentionally blank.
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- Page 52 Revision Date: 2024 June 121916 Rev-04...
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