Owners Guide and Installation Instructions Gas Heavy Duty Water Heater 265 Litre and 275 Litre Models This water heater must be installed and serviced by an authorised person. Please leave this guide with a responsible officer.
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.
CONTENTS RESPONSIBLE OFFICER - We recommend you read pages 4 - 14. The other pages are intended for the installer but may be of interest. How Your Water Heater Works...................................................8 Regular Care ................................................................................9 Save A Service Call ...................................................................11 Installation..................................................................................
ABOUT YOUR WATER HEATER MODEL TYPE Congratulations for choosing a Rheem® Heavy Duty Gas water heater. The model you have chosen is either a 265 litre or 275 litre indoor or outdoor quick recovery water heater. HOW HOT SHOULD THE WATER BE? The water heater has a maximum temperature setting of 82°C and a minimum temperature setting of 60°C. Refer to “Temperature Adjustment” on page 4. For applications requiring sanitising temperatures, the thermostat should be set at 82°C.
ABOUT YOUR WATER HEATER WARNING This water heater is not intended to be operated, adjusted or tampered with by young children or infirm persons. Young children should be supervised to ensure they do not interfere with the water heater. The removal of the access cover(s) will expose 240 V wiring. They must only be removed by an authorised or service person. SAFETY • Do not store flammable or combustible materials near the water heater.
ABOUT YOUR WATER HEATER This water heater is supplied with a thermostat, an over-temperature cut-out, and a combination temperature 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 warranty can become void if relief valves or other safety devices are tampered with or if the installation is not in accordance with these instructions.
ABOUT YOUR WATER HEATER DOES THE WATER QUALITY AFFECT THE WATER HEATER? The water heater is suitable for most public water supplies, however some water qualities may have detrimental effects on the cylinder and fittings. If you are in a known harsh water area you must read page 46. If you are not sure, have your water quality checked against the conditions described on page 46.
HOW YOUR WATER HEATER WORKS Water is stored in a vitreous enamel lined steel cylinder and heated by a gas burner located under the cylinder. The heat produced by the burner is transferred to the water through the base of the cylinder and through the wall of a flue pipe which passes through the centre of the cylinder. A flue baffle in this flue ensures the efficiency of the water heater is correct. The gas supply to the burner is controlled by the thermostat so the water is heated to a constant temperature.
REGULAR CARE TEMPERATURE PRESSURE RELIEF VALVE This valve is near the top of the water heater and is essential for its safe operation. It is possible for the valve to release a little water through the drain line during each heating period. This occurs as the water is heated and expands by approximately 1/50 of its volume. Continuous leakage of water from the valve and its drain line may indicate a problem with the water heater (refer to “Temperature Pressure Relief Valve Running” on page 13).
REGULAR CARE SERVICING For efficient operation the water heater should be serviced annually by your nearest Rheem Service Department or their Accredited Service Agent. Only genuine replacement parts should be used on this water heater. Warning: Servicing of a gas water heater should only be carried out by authorised personnel. In commercial applications where large volumes of hot water are used, sediment may build up on the bottom of the cylinder and reduce the heating efficiency.
SAVE A SERVICE CALL Check the items below before making a service call. You will be charged for attending to any condition or fault that is not related to manufacture or failure of a part. NOT ENOUGH HOT WATER (OR NO HOT WATER) • Is the electricity switched on? Inspect the isolating switch adjacent to the water heater and ensure it is turned on. • Is there a time clock on the power supply? Check the settings on the time clock and ensure they are suitable to enable heating when it is required.
SAVE A SERVICE CALL WATER HEATER NOT OPERATING The ignition system may have ‘locked out’. To reset the water heater, switch the electrical supply off at the isolating switch, wait ten seconds then switch on again. If the water heater fails to light, phone your nearest Rheem Service Department or Accredited Service Agent to arrange for an inspection. DIAGNOSTIC FEATURES OF ELECTRONIC THERMOSTAT This water heater incorporates an electronic thermostat.
SAVE A SERVICE CALL TEMPERATURE PRESSURE RELIEF VALVE RUNNING • Normal Operation It is normal and desirable that this valve allows a small quantity of water to escape during the heating cycle. However, if the discharge is deemed excessive (more than 2% of hot water used), there may be another problem. • Continuous dribble Try gently raising the easing lever on the relief valve for a few seconds (refer to “Temperature Pressure Relief Valve” on page 9).
SAVE A SERVICE CALL WATER HEATER APPEARS TO BE LEAKING When the water heater is first lit or after a large usage of hot water, condensation may form on the burner of the water heater. This is quite normal, especially in winter months and will dry off as the water is heated. HIGH GAS BILLS Should you at any time feel your gas account is too high, we suggest you check the following points: • Is the relief valve running excessively? (Refer to “Temperature Pressure Relief Valve Running” on page 13).
INSTALLATION 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) Note: In Australia, natural gas models can be connected to SNG, however the hourly gas consumption may be reduced (typically by 10%).
INSTALLATION INDOOR INSTALLATION A secondary flue must be installed with an indoor water heater to discharge combustion products outside the building. The flue must be self supporting and not impose a load on the water heater. Use a slip joint or similar to allow for disconnection. There must be a vertical rise of 600 mm from the draught diverter before changing direction. The flue design and installation must comply with AS 5601.
INSTALLATION OUTDOOR INSTALLATION The water heater is to be installed at ground level on a concrete or brick plinth (fire proof base) and must stand vertically upright with the back of the water heater against an external wall or alternatively against a fireproof screen extending at least 500mm above, below and either side of the flue terminal. Failure to observe this precaution can cause problems in high wind areas. A secondary flue is not required.
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 installation diagram (refer to installation diagram on page 25). Model 265, 275 Relief valve setting 1000kPa Expansion control valve setting* 850kPa Max.
INSTALLATION Two Temperature Zones Using a Temperature Limiting Device CIRCULATED HOT WATER FLOW AND RETURN SYSTEM If a Rheem water heater is to be installed as part of a circulated hot water flow and return system, a storage water heater able to provide a hot water outlet temperature of at least 60°C must be used. Note: The thermostat must always be set to at least 60°C. Refer to the diagram on page 20. Refer also to “Recirculation System” on page 43.
INSTALLATION These conditions may result in either water at a temperature exceeding the requirements of AS/NZS 3500.4 being delivered to the hot water outlets in the ablution areas, or the device closing completely and not delivering water at all, or the device failing. Under either condition, the operation and performance of the device cannot be guaranteed.
INSTALLATION SADDLING PIPE WORK To prevent damage to the cylinder when attaching pipe clips or saddles to the water heater jacket, we recommend the use of self drilling screws with a maximum length of 12 mm. Should pre drilling be required, extreme caution must be observed when penetrating the jacket of the water heater. Note: Damage to the cylinder as a result of saddling to the jacket will void the warranty.
INSTALLATION TYPICAL INSTALLATION – OUTDOOR LOCATION 631 275 model shown 22
INSTALLATION TYPICAL INSTALLATION – INDOOR LOCATION 621 275 model shown 23
INSTALLATION DIMENSIONS AND TECHNICAL DATA Model No. Storage capacity (litres) Nominal Dimensions (mm) Weight empty (kg) A B C D E F G H K L M P 621265 (Indoor) 265 1795 610 750 750 700 380 1655 36° 660 302 125 129 631265 (Outdoor) 265 1835 610 710 750 700 380 1655 36° 660 302 420 136 621275 (Indoor) 275 1895 640 780 760 700 340 1695 36° 722 320 200 180 631275 (Outdoor) 275 1865 640 780 760 700 340 1695 36° 722 320 320 190 Hourly Gas Min.
CONNECTIONS – PLUMBING CONNECTION SIZES • Hot water connection: RP 1¼/32. • Cold water connection: RP 1¼/32. • Relief valve connection: RP ¾/20. • Gas inlet: RP¾/20. All plumbing work must be carried out by a qualified person and in accordance with the National Plumbing Standard AS/NZS 3500.4 and local authority requirements. All gas work must be carried out by a qualified person and in accordance with the Australian Gas Installations Standard AS 5601 and local authority requirements.
CONNECTIONS – PLUMBING GAS INLET The gas connection is made to the left hand side of the gas control. The pipe work must be cleared of foreign matter before connection and purged before attempting to light the water heater. An isolation valve and disconnection union must be used to allow servicing and removal of the water heater. Refer to the Gas Installations Standard AS 5601 for the correct pipe sizing. Warning: Always isolate the water heater before pressure testing the gas supply system.
CONNECTIONS – PLUMBING RELIEF VALVE DRAIN A copper drain line must be fitted to the relief valve to carry the discharge clear of the water heater. Connect the drain line to the relief valve using a disconnection union. The pipe work from the relief valve to the drain should be as short as possible and fall all the way from the water heater with no restrictions. It should have no more than three right angle bends in it. Use DN20 pipe.
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. All electrical work and permanent wiring must be carried out by a qualified person and in accordance with the Wiring Rules AS/NZS 3000 and local authority requirements. The water heater, supplied with a 1.8 metre power cord, requires a 240 V general power outlet (GPO) to be located within 1.2 metres of the installation.
CONNECTIONS – ELECTRICAL WIRING A POWER FLUED SYSTEM TO THE WATER HEATER An indoor model can be wired to a power flued system. A power flued system must be designed by a qualified person to suit the particular installation and for approval by the gas supply authority. The power flue system must be interlocked with the water heater(s) to prevent the water heater(s) from operating if the power flue is not working.
CONNECTIONS – ELECTRICAL POWER FLUE EXTERNAL CONTROLS – INTERMITTENT OPERATION Notes 1. Power source for the water heater, fan and control circuit must be from the same circuit. 2. R1 monitors return signal. 3. R2 monitors alarm signal. 4. T1 to be set for 20-30 seconds. 5. Meets requirements of Clause H.2.2.6 of AS5601 – 2004, providing lockout in the event of flue product flow failure. 6.
CONNECTIONS – ELECTRICAL POWER FLUE EXTERNAL CONTROLS – 24 HOUR OPERATION Notes: 1. Power source for the water heater, fan and control circuit must be from the same circuit. 2. R1 monitors return signal. 3. R2 monitors alarm signal. 4. T1 to be set for 20-30 seconds. 5. Use SPO with round earth terminal. Water heater supply cord must be changed to suit. 6. Meets requirements of Clause H.2.2.6 of AS5601 – 2004, providing lockout in the event of flue product flow failure.
MULTIPLE INSTALLATIONS A multiple installation of Rheem water heaters on a single manifold or multiple manifolds is possible, using the Rheem Equa-Flow® manifold system, where large volumes of hot water are required. The Equa-Flow principle will function with water heaters in line, around a corner or in rows back to back (refer to the diagrams on page 33). The cold water and hot water manifolds must be designed to balance the flow from each water heater.
MULTIPLE INSTALLATIONS In Line Manifold Single Bank of Water Heaters Multiple Banks of Water Heaters Angle Manifold Back to Back Manifold TPR Valve Drain Line Common Discharge Point 33
MULTIPLE INSTALLATIONS LEGEND TYPICAL INSTALLATION – RHEEM HEAVY DUTY GAS WATER HEATERS 34
MULTIPLE INSTALLATIONS In Line Manifold NOTES: 1. Minimum recommended space between wall and back of water heater is 100 mm. Angle Manifold 2. A minimum of 900 mm (E* & F*) should be left in front of the water heater for access, servicing and water heater removal.
MULTIPLE INSTALLATIONS MANIFOLD ARRANGEMENT Hot Manifold Assembly Cold Manifold Assembly 36
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 tap(s) in the building (don’t forget the showers) and supply cock(s) and valve(s) in the system. • Open the isolation valves fully on the cold and hot water branches to the water heater(s) installed in a bank.
COMMISSIONING 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 Town / TLP 1.13 kPa 0.75 kPa Propane Butane 2.75 kPa 2.75 kPa If this minimum cannot be achieved, it may indicate the meter or the gas line to the water heater is undersized.
LIGHTING THE WATER HEATER FOR YOUR SAFETY READ BEFORE LIGHTING Warning: This gas water heater is designed to operate reliably and safely as long as the lighting procedure is followed exactly. Make sure the water heater is filled with water and the water supply is on, otherwise serious damage to the vitreous enamel cylinder lining and plastic components may occur.
LIGHTING THE WATER HEATER DIAGNOSTIC FEATURES OF HOT SURFACE IGNITION CONTROL Warning: The removal of the access covers will expose 240 V wiring. They must only be removed by an authorised or service person only. The water heater incorporates an electronic control module. This is located inside the access cover of an indoor model and to the right of the access cover inside the air duct on an outdoor model (refer to installation diagrams on pages 22 and 23).
LIGHTING THE WATER HEATER • The burner flame should be blue, with a clearly defined inner cone luminous yellow or “floating” flames are not acceptable and must be corrected by opening the interrupter screw (refer to “Air Adjustment” on page 41). • Check the test point pressure and compare with the rating label. Adjust if necessary. • If unable to get the water heater working properly, contact your nearest Rheem Service Department or Accredited Service Agent to arrange for an inspection.
DRAINING THE WATER HEATER To drain the water heater: • Turn off the water heater (refer to “To Turn Off The Water Heater” on page 38). • Close all hot water taps. • Operate the relief valve release lever - do not let the lever snap back or you will damage the valve seat. Operating the lever will release the pressure in the water heater. • Attach a hose to the water heater drain cock. Let the other end of the hose go to a drain. • Open the drain cock. • Operate the relief valve again.
TEMPERATURE CONTROL HOTTER WATER INCREASES THE RISK OF SCALD INJURY. 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 the water heater and the hot water outlets in any ablution and public areas such as bathrooms, ensuites or public amenities, to reduce the risk of scalding.
TEMPERATURE CONTROL THERMOSTAT ADJUSTMENT The water heater is supplied with the thermostat preset at 70ºC. It will be necessary to adjust the thermostat temperature setting if another temperature is required. When adjusting the thermostat temperature it is necessary to alter the thermostat offset. The table outlines the thermostat temperature and the corresponding offset. Failure to adjust the offset will result in incorrect water temperature.
This page is intentionally blank.
WATER SUPPLIES Your water heater is manufactured to suit the water conditions of most metropolitan supplies. However, there are some known water supplies which can have detrimental effects on the water heater and its operation and/or life expectancy. If you are unsure of your water quality, you can obtain information from your local water supply authority.
RHEEM MAINS PRESSURE WATER HEATER WARRANTY - AUSTRALIA ONLY WARRANTY CONDITIONS Accredited Service Agent’s premises and the installed site shall be the owner’s responsibility. manufactured from 1st September 2005. 2. The water heater must be installed in accordance with the 5.
RHEEM MAINS PRESSURE WATER HEATER WARRANTY - AUSTRALIA ONLY WARRANTY Rheem will: a) Repair or, if necessary replace any Rheem water heater; or b) Replace any component (or, if necessary, arrange the installation of a new water heater), which falls within the Warranty Periods specified below, subject to the warranty conditions and exclusions.
