Rinnai HOTFLO User manual

This appliance shall be installed in accordance with:
xManufacturers Installation Instructions
xMunicipal Building Codes
xAS/NZS 3000 Wiring Rules
xAS/NZS 3500.4 Plumbing and Drainage
xAny other local relevant Statutory Regulation
Installation and Service must be performed by an authorised person.
THIS APPLIANCE IS NOT SUITABLE FOR USE AS A POOL OR SPA HEATER.
Mains Pressure Vitreous Enamel
Electric Storage Water Heater
®
‘HOTFLO’ Operation / Installation Manual
Distributed and serviced in Australia under a Quality
System certified as complying with ISO 9001 by
SAI Global

Rinnai Australia - i - HOTFLO Electric Storage Tanks Operating/Installation Manual
Your Rinnai Hotflo Mains Pressure Vitreous Enamel Storage Electric Water Heater has been certified
by relevant plumbing and electrical authorities and the details are shown on data plate.
This appliance must be installed correctly by an authorised person and must conform to location
regulations.
The installation must also comply with the instructions supplied by Rinnai.
Please keep this instruction booklet in a safe place for future reference.
Notice to Victorian Consumers
This appliance must be installed by a person licensed with the Plumbing Industry Commission.
Only a licensed person will have insurance protecting their workmanship.
So make sure you use a licensed person to install this appliance and ask for your Compliance
Certificate.
For further information contact the Plumbing Industry Commission on 1800 015 129.
Installation and service only by an authorised person.
Removal of access covers will expose 240V wiring. Access covers to be removed by authorised
persons only.
This water heater is not intended to be operated or adjusted by young children or infirm persons.
Young children must be supervised to ensure they do not interfere with the water heater.
If the power supply cord, plug or electrical conduit to the water heater is damaged, it must be replaced
by an authorised person in order to avoid a hazard, using genuine replacement parts available from
Rinnai.
•DO NOT operate this system before reading the manufacturers instructions
•DO NOT place articles on or against this appliance
•DO NOT store chemicals or flammable materials near this appliance
•DO NOT operate with panels or covers removed from this appliance
•DO NOT activate heating elements unless cylinder is full of water
•DO NOT touch any power supply cords, plugs or electrical conduits with wet hands.
REGULATORY INFORMATION
WARNINGS

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REGULATORY INFORMATION...................................................................................i
WARNINGS ..................................................................................................................i
SAFETY.......................................................................................................................4
Hydrogen Gas.................................................................................................................................... 4
Water Temperature............................................................................................................................ 4
IMPORTANT INFORMATION .....................................................................................4
SAFETY DEVICES ............................................................................................................................ 5
ANODE .............................................................................................................................................. 5
WATER QUALITY.............................................................................................................................. 5
TURNING ‘OFF’ THE WATER HEATING SYSTEM.......................................................................... 5
TURNING ‘ON’ THE WATER HEATING SYSTEM............................................................................ 5
HOW THE WATER HEATER WORKS.............................................................................................. 5
REGULAR CARE............................................................................................................................... 6
Over flow tray and drain..................................................................................................................... 6
Pressure and Temperature Relief (P&TR) Valve............................................................................... 6
Expansion Control Valve (ECV) if fitted ............................................................................................. 6
SERVICING AND REPAIR..........................................................................................7
SAVE A SERVICE CALL ................................................................................................................... 7
LACK OF HOT WATER OR NO HOT WATER ................................................................................. 7
HIGH ELECTRICITY BILLS............................................................................................................... 7
WATER HEATER VALVES DISCHARGING EXCESSIVELY ........................................................... 8
GENERAL INSTALLATION ........................................................................................9
INSTALLATION DIAGRAMS ............................................................................................................. 9
Figure 1 - Typical Installation of Water Heater ................................................................................ 9
Figure 2 - Hot Water Plumbing System Example - No Temperature Limiting Device ..................... 9
Figure 3 - Hot Water Plumbing System Example - with Temperature Limiting Device (TLD) ....... 10
Figure 4 - Hot Water Plumbing Water Heater system Example - with Flow & Return Pipe Work . 10
Figure 5 - Hot Water Plumbing System Example with Flow and Return Pipe Work and TLD ....... 11
WATER HEATER LOCATION......................................................................................................... 11
WATER QUALITY............................................................................................................................ 12
Connection to a low pressure gravity or tank water supply.............................................................. 12
HOT WATER STORAGE AND DELIVERY TEMPERATURES....................................................... 12
Storage Temperature....................................................................................................................... 12
Sanitary Fixtures Delivery Temperature ..........................................................................................12
Water Pipes ..................................................................................................................................... 12
Electrical Supply .............................................................................................................................. 13
Valves and fittings............................................................................................................................ 13
TABLE OF CONTENTS

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PLUMBING CONNECTIONS .......................................................................................................... 13
P&TR Valve Connection .................................................................................................................. 13
Expansion Control Valve (ECV)....................................................................................................... 14
Drain Lines....................................................................................................................................... 14
ELECTRICAL CONNECTIONS ...................................................................................................... 14
Figure 6 - Single Element Wiring Diagram .................................................................................... 14
Thermostat Setting........................................................................................................................... 14
COMMISSIONING .....................................................................................................15
To fill and turn ‘ON’ the water heater ............................................................................................... 15
To turn ‘OFF’ the water heater......................................................................................................... 15
Draining............................................................................................................................................ 15
SPECIFICATIONS.....................................................................................................16
Figure 7 - Dimensional Drawing ..................................................................................................... 16
Table 1 - Specifications ................................................................................................................... 17
Table 2 - Warranty Terms .............................................................................................................. 18
Definition of Domestic Use............................................................................................................... 18
Definition of Commercial Use .......................................................................................................... 18
WARRANTY ..............................................................................................................18
WARRANTY CONDITIONS.............................................................................................................19
Table 3 - Water chemistry and impurity limits for all water heating systems .................................. 19
WARRANTY EXCLUSIONS ............................................................................................................ 19
CONTACT INFORMATION .......................................................................................21
CUSTOMER INFORMATION

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Hydrogen Gas
If the hot water heater is not used for two weeks or more, a quantity of hydrogen gas, which is highly
flammable, may accumulate in the water heater. To dissipate this safety, it is recommended that a non
electrically operated hot tap be turned on for several minutes at a sink, or bath, but not at dishwasher
or other appliance. During this procedure there must be no smoking, open flame or any electrical
appliance operating nearby. If hydrogen gas is discharged through the tap, it will probably make a
sound like air escaping.
Water Temperature
To meet regulatory requirements the temperature of stored water heater must not be less than 60°C.
The thermostat on your water heater is factory pre-set to 65°C which is suitable for the vast majority
of domestic applications.
The thermostat setting can be adjusted between 60°C and 75°C by an electrician or other suitably
qualified trades person.
• The thermostat setting must only be adjusted by an Electrician or other
suitably qualified trades person.
• The access cover to the element and thermostat must only be removed by an
Electrician or other suitably qualified trades person.
Hot Water can cause scalds.
Children, disabled, and the elderly are at the
highest risk of being scalded.
Feel water temperature before bathing or
showering.
Scalds from hot water taps can result in severe
injuries to young children.
Scalds can occur when children are exposed
directly to hot water when they are placed into a
bath which is too hot.
DO
•Do stay with children
whenever they are in the
bathroom (Take the phone off
the hook).
•Do take them out of the
bathroom if you need to
answer the phone or door.
•Do test the temperature of the
water with your elbow before
placing your child in the bath.
•Do make sure that the tap is
turned off tightly.
•Do install a child proof tap
cover OR
•Do install a child resistant tap.
•Consider child-resistant taps or
tap covers, which prevent a
small hand being able to turn
on the tap.
•Consider installing tempering
valves or thermostatic mixing
valves which reduce the hot
water temperature delivered to
taps. Your local plumbing
authority may already require
that these be fitted. Contact
your installer or local plumbing
authority if in doubt.
DON’T
•DON’T leave a toddler
in the care of another
small child. The older
child may not have set
the water temperature
to a safe level.
NOTE
IMPORTANT INFORMATION
SAFETY

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SAFETY DEVICES
For safe operation this water heater is fitted with a combination Pressure & Temperature Relief
(P&TR) Valve, a thermostat and an over-temperature cutout for each heating element.
ANODE
The water heater is fitted with a sacrificial anode to extend it's life. It will slowly dissipate whilst
protecting the cylinder. The life of the water heater may be extended by arranging for an authorised
person to inspect the anode and replace it if required. It is recommended that the anode be inspected
at least every 5 years.
WATER QUALITY
The water quality of most public supplies is suitable for the water heating system. The water quality
from bore wells is generally unsuitable for the water heating system. Refer to the 'Warranty
Conditions' for water quality parameters and how they affect the warranty conditions. If in doubt about
the water quality, have it checked against the parameters listed in the warranty conditions.
If sludge or foreign matter is present in the water supply, a suitable strainer filter should be
incorporated in the water supply to the system.
TURNING ‘OFF’ THE WATER HEATING SYSTEM
If you plan to be away for only a few nights, we suggest you leave the water heating system switched
on. If it is necessary to switch off the water heater, the switch is usually marked and located in the
electricity meter box of the dwelling.
TURNING ‘ON’ THE WATER HEATING SYSTEM
Switch on the electric supply to the heating element. The switch is usually marked and located in the
electricity meter box of the dwelling. Water heating will now occur as required. It may take a number
of hours before hot water is available.
HOW THE WATER HEATER WORKS
A vitreous enamel lined steel cylinder stores water which is heated by an electric heating element
located at the base of the cylinder. An automatic thermostat controls the water temperature. The water
heater connects directly to the mains water supply.
The heating element can be connected to a Continuous or Off-Peak electricity supply. The continuous
supply is appropriate when the water heater capacity is less than the daily usage of hot water. The
Off- Peak supply is appropriate when the water heater capacity exceeds the daily usage of hot water.
The Off-Peak supply allows heating only for set periods and a volume of water sufficient for daily
usage is heated during the set period and stored. The Off-Peak supply is usually cheaper. Electricity
supply types and tariffs vary according to the local electricity authority.
•DO NOT tamper with or remove safety devices.
•DO NOT operate this water heater unless all safety devices are fitted and in working
order.
•DO NOT block or seal the P&TR Valve and drain pipe.
WARNING
IMPORTANT INFORMATION

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REGULAR CARE
Over flow tray and drain
The overflow tray and drain (if fitted) should be periodically checked to ensure there are no blockages.
Pressure and Temperature Relief (P&TR) Valve
This valve is located near the top of the water heater and is essential for safe operation. It is normal
for the valve to release a small quantity of water through the drain line during heating. However,
continuous leakage of water from the valve and its drain line may indicate a problem with the water
heater.
Expansion Control Valve (ECV) if fitted
Operate the easing lever on the expansion control valve once every six months. It is very important
you raise and lower the lever gently.
• Never block the outlet of the P&TR valve or its drain
line for any reason. The easing gear must be
operated at least once every six months or more
frequently in areas with a high incidence of water
deposits. It is very important you raise and lower the
easing gear gently.
• Failure to do this may result in the water heater
cylinder failing or under certain circumstances,
exploding.
• If the valve does not discharge water when the
easing gear lever is lifted, or does not seal again
when the easing gear is closed, attendance by an
authorised person must be arranged without delay.
The P&TR valve is not serviceable.
WARNING
WARNING
IMPORTANT INFORMATION

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Our Servicing network personnel are fully trained and equipped to give the best service on your Rinnai
appliance. If your appliance needs service, ring one of the service contact numbers on the back of this
booklet.
The pressure and temperature relief valve and expansion control valve must be checked for
performance or replaced by an authorised person at intervals not exceeding 5 years or more
frequently in areas where the water is classified as scaling water (see ‘Water Quality’).
It is recommended that the sacrificial anode be inspected every 5 years or more frequently in areas
where there is a high incidence of water deposits.
If the electric conduit, power supply cord or plug to the water heater is damaged, they must be
replaced by an authorised person in order to avoid a hazard. The power supply cord and plug (if fitted)
must be replaced by a genuine replacement part available from Rinnai.
SAVE A SERVICE CALL
Check the items below before requesting Service. Service and parts charges may be incurred where
it is found that there is no fault with the water heater and the issue is related to the plumbing installation
or is due to the failure of water or electric supplies.
LACK OF HOT WATER OR NO HOT WATER
HIGH ELECTRICITY BILLS
If you think your electricity bill is too high, investigate the following:
• You may be using more hot water than you think. This applies especially to showering. Review
hot water usage, especially the time taken for showering, and investigate the use of flow control
valves or 'water saving' shower roses. Investigate recent changes to hot water usage patterns.
• Water heater valves may be discharging excessively. Refer to the section "Water heater valves
discharging excessively".
• There may be hot water leakages in hot water pipes or taps. Have these checked and rectified
by a plumber.
• There may have been changes in electricity tariffs since your last bill.
If, after investigating the above, you still require assistance contact Rinnai.
Is there electricity supply to the water heater?
• Check that the isolating switch marked "HOT WATER" or "WATER HEATER" at the
meter box is switched on. Check also that any isolating switches installed near the
water heater are switched on.
• Check the fuse or circuit breaker marked "HOT WATER" or "WATER HEATER" at
the meter box. Repeated failure of fuse or tripping of circuit breaker indicates a fault
which must be investigated by an authorised trades person.
Are you using more hot water than you think?
• Often it is not realized how much hot water is actually used. This applies especially to
showering. Review hot water usage, especially the time taken for showering, and
investigate the use of flow control valves or Water saving shower roses.
Are water heater valves discharging excessively?
• Refer to the section “Water heater valves discharging excessively”.
QUESTION
QUESTION
QUESTION
SERVICING AND REPAIR

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WATER HEATER VALVES DISCHARGING EXCESSIVELY
Pressure and Temperature Relief (P&TR) valve
It is normal and desirable that this valve allows a small quantity of water to be discharged during the
heating cycle. If it discharges more than a bucket of water during a 24 hour period or discharges
continuously there may be another problem.
If the valve dribbles continuously, try easing the valve gear for a few seconds as described under
'Regular Care'. This may dislodge any foreign matter and alleviate the problem.
If the valve discharges at high flows, especially at night, it may be as a result of the water pressure
exceeding the design pressure of the water heater. Ask your installer to fit a Pressure Limiting Valve
(PLV).
Expansion Control Valve (ECV) - if fitted
It is normal and desirable that this valve allows a small quantity of water to be discharged during the
heating cycle. If it discharges more than a bucket of water during a 24 hour period or discharges
continuously there may be another problem.
If the valve leaks continuously, try easing the valve gear for a few seconds as described under
'Regular Care'. This may dislodge any foreign matter and alleviate the problem. If this does not
alleviate the problem contact Rinnai.
SERVICE
The system should be checked and serviced by an authorised person at least every 5 years.
The P&TR valve must be replaced at intervals not exceeding five (5) years.
Rinnai has a service and spare parts network with personnel who are trained and equipped to give
the best service on Rinnai appliances.
• Never replace the P&TR valve with one which has a higher pressure rating than
is specified for your water heater.
• If the valve discharges hot water at high flows until the water heater is cold
and then stops discharging until the water reheats there may be a serious
problem. Switch off the power supply in the meter box (the switch marked
‘WATER HEATER’ or ‘HOT WATER’) or the isolating switch installed near the
water heater and contact Rinnai.
WARNING
SERVICING AND REPAIRSERVICING AND REPAIR

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This appliance shall be installed in accordance with:
THIS APPLIANCE IS NOT SUITABLE FOR USE AS A DOMESTIC SPA POOL OR SWIMMING
POOL HEATER.
INSTALLATION DIAGRAMS
Figure 1 - Typical Installation of Water Heater
Figure 2 - Hot Water Plumbing System Example - No Temperature Limiting Device
•Manufacturer's Installation Instructions
•AS/NZS 3500.4
•AS/NZS 3000 Wiring Rules
•Local Plumbing, Water and Electrical Authority Regulations
•Municipal Building Codes
•Any other relevant Statutory Regulations
ANODE CAP
P&TR VALVE Connection
RP 3/4" / 20mm
Use supplied PTR
Valve with 1/2"
Reducing Bush
HOT WATER OUTLET
Connection - Left
RP 3/4"/ 20mm use a
union connection and
Insulate Hot water pipe
P&TR Valve Drain
pipe, Copper only
Drain in Accordance
with AS 3500.4
Connection-Left
RP 3/4" / 20mm
Data and Warning Labels
ELECTRIC SUPPLY CABLE CONNECTION
by a qualified electrical trades person in
accordance with AS 3000
WATER HEATER SUPPORT
in accordance with AS 3500.4
Duplicate COLD WATER INLET
WATER HEATER- located closest to most
frequently used outlet - Access for
service in the installed position
Duplicate HOT WATER OUTLET
ELEMENT+THERMOSTAT Cover
- Removed by qualified electrical
trades person only.
SAFETRAY+DRAIN-optional in accordance
with AS3500.4
Cold Water Inlet
NOTE
Valves with pressure ratings other than specified are unsuitable & must not be used.
KITCHEN
LAUNDRY
ENSUITE
BATHROOM
NON TEMPERED
SUPPLY
NON RETURN
VALVE
PLV(SUPPLIED)
500 kPa ECV (Not Supplied)
700 kPa
ISOLATING VALVE
P&TR VALVE
(Supplied) 850 kPa
WATER
HEATER
COLD
SUPPLY
NOTE
Valves with pressure ratings other than specified are unsuitable & must not be used.
GENERAL INSTALLATION

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Figure 3 - Hot Water Plumbing System Example - with Temperature Limiting Device (TLD)
Figure 4 - Hot Water Plumbing Water Heater system Example - with Flow & Return Pipe Work
KITCHEN
LAUNDRY
ENSUITE
BATHROOM
TEMPERED
Supply
NON TEMPERED
SUPPLY
NON RETURN
VALVE
TEMPERATURE
LIMITING DEVICE
(TLD)
NON RETURN
VALVE
NON RETURN
VALVE
PLV(SUPPLIED)
500 kPa ECV(Not Supplied)
700 kPa
ISOLATING VALVE
P&TR VALVE
(Supplied) 850 kPa
WATER
HEATER
COLD
Supply
COLD
Supply
NON RETURN
VALVE
TEMPERATURE
LIMITING DEVICE
(TLD)
PLV (SUPPLIED)
500 kPa
ISOLATING VALVE
ISOLATING VALVE
NON RETURN
VALVE
PLV ECV
(OR)
Water
Heater
It may be a requirement that the hot and cold water supply pressures to a Temperature Limiting Device (TLD)
are equal. If this is the case, a Pressure Limiting Valve (PLV) with the same pressure rating as the PLV for
the hot water is required for the TLD as shown.
NOTE
Valves with pressure ratings other than specified are unsuitable & must not be used.
KITCHEN
LAUNDRY
ENSUITE
BATHROOM
NON RETURN
VALVE
PLV(SUPPLIED)
500 kPa ECV(Not Supplied)
700 kPa
ISOLATING VALVE
P&TR VALVE
(Supplied 850 kPa)
WATER
HEATER
COLD
Supply
ISOLATING VALVE
NON RETURN
VALVE
FLOW+RETURN PUMP
ISOLATING VALVE
NOTE
Valves with pressure ratings other than specified are unsuitable & must not be used.
GENERAL INSTALLATION

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Figure 5 - Hot Water Plumbing System Example with Flow and Return Pipe Work and TLD
WATER HEATER LOCATION
All Rinnai mains pressure electric storage hot water systems have an ingress protection rating of IPX4
making them suitable for internal or external installation.
The water heater should be placed as close as practicable to the most frequently used hot water outlet
point or points to minimize the delay time for hot water delivery. This will usually be the kitchen tap.
For installations where the distance between the water heater and the outlets is considerable, a flow
and return system can be used which minimize the waiting time for hot water delivery.
It is recommended that the water heater is installed at ground or floor level. It must be installed in a
vertically upright position. The water heater must be accessible without the use of a ladder or scaffold.
It must not be installed in roof spaces.
Ensure the pressure and temperature pressure relief (P&TR) valve, front covers, thermostats and
heating elements have sufficient clearances and are accessible for service and removal.The
information on the rating plates must also be readable. Leave adequate distance above the water
heater (preferably the height of the water heater itself) so the sacrificial anode can be inspected and
replaced via the top cover.
The water heater must be installed in freestanding mode on a level and stable base. For external
installations, the water heater should be mounted on a concrete base at least 50 mm thick or on well
seasoned, evenly spread hardwood slats with a thickness of at least 25 mm. Where property damage
can occur as a result of water leakage, the water heater must be installed with a safe tray (overflow
tray) and drain in accordance with AS 3500.4. Ensure the water heater does not stand on wet
surfaces.
KITCHEN
LAUNDRY
ENSUITE
BATHROOM
NON RETURN
VALVE
PLV(SUPPLIED)
500 kPa ECV(Not Supplied)
700 kPa
ISOLATING VALVE
P&TR VALVE
(Supplied 850 kPa
WATER
HEATER
COLD
Supply
NON RETURN
VALVE
FLOW+RETURN PUMP
ISOLATING VALVE
UNTEMPERED SUPPLY
TLD
NOTE
Valves with pressure ratings other than specified are unsuitable and must
not be used.
1. This schematic is an example only, variations may also be suitable.
2. Tempered water from a TLD cannot be re-circulated. The TLD must
be positioned in a dead leg, branching off the circulated hot water
flow and return pipe.
WARNING
GENERAL INSTALLATION

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WATER QUALITY
The water quality of most public supplies is suitable for the water heater. Water quality from bore wells
is generally unsuitable. Refer to the ‘Warranty Conditions’ for water quality parameters and how they
affect warranty. If in doubt about water quality, have it checked against the parameters listed in the
warranty conditions.
In a scaling water supply, calcium carbonate and possibly other compounds are deposited out of the
water onto any hot metallic surface and form a scale.
Scaling water is defined as having a total hardness in excess of 200 mg/litre (expressed as Calcium
Carbonate) or a Saturation Index in excess of +0.4. Scale deposits may form onto the metallic
surfaces of the P&TR valve and may prevent it from operating properly. To prevent this, an expansion
control valve (ECV) must be fitted on the cold water line after the non-return valve in areas of scaling
water. ECVs’ must be fitted in South Australia and Western Australia to comply with local regulations.
Refer to the ‘Warranty Conditions’ for water quality parameters and how they affect warranty. If in
doubt about water quality, have it checked against the parameters listed in the warranty conditions. If
sludge or foreign matter is present in the water supply, a suitable strainer or filter should be
incorporated in the water supply to the storage cylinder.
Connection to a low pressure gravity or tank water supply
If the water heater is supplied by a low pressure gravity or tank water supply, the bottom of the supply
tank must be at least one meter above the highest hot water outlet and care must be taken to avoid
air locks. Pipe sizing and valve selection must be performed to allow for the water supply pressure.
HOT WATER STORAGE AND DELIVERY TEMPERATURES
Storage Temperature
AS 3500.4 conveys that hot water shall be stored at a minimum temperature of 60°C. The thermostat
setting on the storage water heater has been factory pre-set to 65°C to meet this requirement. The
thermostat temperature setting is adjustable to a maximum temperature setting of 75°C but this
usually is not required.
Sanitary Fixtures Delivery Temperature
Water temperatures over 50°C can cause severe scalds. Children, disabled and the elderly are at the
highest risk or being scalded.
Local regulations and/or the requirements of AS/NZS 3500.4 must be considered regarding the
temperature limitations of hot water supplied to areas used primarily for personal hygiene. The
temperature of is limited to 45°C for early childhood centres primary and secondary schools and
nursing homes or similar facilities for young, aged, sick or people with disabilities and 50°C for all other
buildings. To comply with these requirements, a temperature limiting device, such as a tempering or
thermostatic mixing valve, will be required on all 'new' installations.
Installers should explain to customers the merits of limiting the temperature of water supplied to areas
used primarily for personal hygiene for installations which are not classified as 'new'.
Figures 3 and 5 show the installation examples with Temperature Limiting Devices (TLD's).
Water Pipes
All hot water pipe work should be insulated with Polythene foam or equivalent insulation to optimize
performance and energy efficiency. Such insulation may also be mandatory under local regulations.
Insulation must be weatherproof and UV resistant if exposed.
Water pipe sizing should be performed in accordance with AS/NZS 3500.4.
To prevent damage to the water heater when attaching pipe clips or saddles to the jacket, it is
recommended that self drilling screws with a maximum length of 12mm are used. If drilling is required
take extreme care not to penetrate the inner cylinder. Damage to the inner cylinder is not covered
under warranty.
• The thermostat settings must only be adjusted by an Electrician or other
suitably qualified trades person.
• The access cover to the element and thermostat must only be removed by an
Electrician or other suitably qualified trades person.
WARNING
GENERAL INSTALLATION

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Electrical Supply
Electrical connection must be carried out by a qualified person and in accordance with AS 3000
'Wiring Rules' and local authority requirements.
A water heater not fitted with a power cord & plug must have the heating element connected to an
independent, fused, AC 240V 50 Hz power supply with an isolating switch installed at the switch
board. Ensure the household wiring to the system iscapable of withstanding the system electrical load
(refer to Specifications - Table 1 for electrical load details). A power cord is available for replacement.
Please contact Rinnai Customer Care for part number.
A water heater fitted with a power cord & plug must be plugged into a switched, AC 240V AC, 50 Hz
mains power outlet rated at 10 Amps.
The power supply canbe Off-Peak (overnight), Extended Off-Peak (overnight and day), or Continuous
(day). Check the available tariffs with the local electricity supplier. The Off-Peak (overnight) supply is
usually the most economical for the customer.
Valves and fittings
Valves & fittings supplied with water heater are placed in the Styrofoam packaging base during transit.
The pressure ratings of valves are shown in Table 1.
The following valves and fittings are supplied:
• A combined Pressure & Temperature (P&TR) Relief Valve. This valve is fitted at the top of the
storage cylinder. The P&TR valve is a safety device and it is mandatory that it is fitted by the
installer in all installations.
• A Pressure Limiting Valve (PLV). A 500 kPa PLV is supplied with all tanks. It must be fitted if the
Mains Pressure exceeds the limits shown in Table 1. If the mains pressure is within the limits
shown in Table 1 fitment of the PLV is optional. However, it is recommended that the PLV is fitted
in all installations as it aids water and energy conservation.
• Two brass plugs are supplied to plug the unused hot and cold connections.
• A reducing bush is supplied to enable fitment of the ¾" P&TR valve connection to the ½" tank
connection.
The following valves and fittings are to be supplied by the installer:
• A cold water Expansion Control Valve (ECV) must be fitted in areas with a ‘scaling’ water supply,
having a total hardness in excess of 200 mg/litre (expressed as Calcium Carbonate) or
Saturation Index in excess of + 0.4 as detailed under Water Quality, if required. ECVs’ must be
fitted in South Australia and Western Australia to comply with local regulations. For pressure
setting information refer Table 1.
• A stop cock and non return valve. Combination valves incorporating these functions (such as
'Duo' or 'Trio' valves) are suitable. These are fitted to the cold water supply to the water heater.
• A pressure limiting device, such as a tempering valve, if required.
PLUMBING CONNECTIONS
Refer to Figure 1 for the location and specification of each plumbing connection to the water heater.
The water heater has 'dual handed' coldsupply and hotoutlet connections. Thebrass plugs (supplied)
are used to plug unused connections.
P&TR Valve Connection
The P&TR Valve must be fitted before the water heater is operated. Before installation, ascertain that
the probe is straight and undamaged. Seal the thread with Teflon tape - never use hemp.
Make certain the edge of the Teflon tape does not protrude past the end of the thread. Screw the
reducing bush supplied into the fitting on the water heater marked P&TR Valve, then screw the P&TR
Valves with pressure ratings other than those listed above must not be used.
WARNING
GENERAL INSTALLATION

Rinnai Australia - 14 - HOTFLO Electric Storage Tanks Operating/Installation Manual
Expansion Control Valve (ECV)
The expansion control valve (if used) must always be installed after the non return valve and be the
last valve installed before the water heater (Refer to Figures 2 - 5).
Drain Lines
Copper drain lines (½” or DN15) must be fitted to the P&TR valve and ECV (if fitted). The length should
be as short as possible on a continuous downward slope with no restrictions. Length should not
exceed 9 metres with no more than three right angle bends. In areas where water pipes are prone to
freezing, drain lines must be insulated and not exceed 300mm in length. In this case the drain line
must discharge into a tundish through an air gap of between 75mm and 150 mm.
The outlet of drain lines must be positioned so that they are readily visible but not cause injury,
damage or nuisance.
ELECTRICAL CONNECTIONS
The water heater must be filled with water prior to connection to the power supply.
Disconnect all power prior to installation and commissioning. This appliance is
designed for single phase 240 Volts, AC mains electrical operation. All electrical
connections must be made by an authorised person and must comply with all local
electrical supply regulations and AS 3000.
The household wiring to the heater must be capable of withstanding the appliance
load.
Electrical access is via a 20 mm hole beneath the element cover for
mounting with an approved weatherproof electrical conduit nipple. For
entry to the element cover remove the two fixing screws. Connect all
ACTIVE and NEUTRAL wires in accordance with the wiring diagram
which is also included at the rear of the element access cover. Ensure
the incoming EARTH wire is securely fixed to the earth post provided on
the heater case. Inspect and ensure that all wiring links are secure prior
to fixing the access cover and turning the POWER ON.
To ensure the Over-temperature and Energy Cutout is set, press the
(red) 'reset' button on the Thermostat.
Figure 6 - Single Element Wiring Diagram
Thermostat Setting
The thermostat is adjustable from 60°C to 75°C. Turning the adjustment knob anticlockwise
decreases the temperature setting and turning it clockwise increases the temperature setting. Rinnai
advice that the thermostat be set at 65° C, this temperature is sufficient for most users. Ensure the
power supply is switched OFF before removing the access cover to the element & thermostat.
• The access cover to the element and thermostat must only be removed by an
Electrician or other suitably qualified trades person.
• The thermostat setting must only be adjusted by an electrician or other
suitably qualified trades person.
• After adjustment, press the (red) ‘Reset’ Button on the thermostats to ensure
the over-temperature and energy cut-out is set.
CAUTION
WARNING
NOTE
WARNING
GENERAL INSTALLATION

Rinnai Australia - 15 - HOTFLO Electric Storage Tanks Operating/Installation Manual
Commissioning and draining activities must be carried out by an authorised person.
To fill and turn ‘ON’ the water heater
• Open all hot water taps in the house, including the shower.
• Open the cold water isolation valve to water heater. Air will now be forced out of the taps.
• Close each tap when water runs freely without air bubbles.
• Check all plumbing connections and pipe work for water leaks.
• Switch on the electric power supply.
To turn ‘OFF’ the water heater
It may be necessary to turn off a water heater after installation and commissioning, for example during
building activities or if the premises are vacant.
To turn ‘OFF’ the water heater:
• Switch off the electricity supply at the isolating switch to the water heater.
• Unplug the power supply cord from the power outlet (only for models fitted with power supply
cord).
• Close the cold water isolation valve at the inlet to the water heater.
Draining
To drain the water heater:
• Turn off the water heater.
• Close all hot water taps.
• Operate the P&TR valve release - gently. Operating the P&TR valve release will relieve the
pressure in the water heater.
• Undo the cold water inlet union. Attach a hose to the water heater side of the union. Let the other
end of the hose go to a drain.
• Operate the P&TR valve again. This allows air into the water heater and will result in water
draining through the hose.
• Do not switch on the electric power supply until the water heater is filled
completely with water.
WARNING
COMMISSIONING

Rinnai Australia - 16 - HOTFLO Electric Storage Tanks Operating/Installation Manual
ModelsABCDEF
HFE40S 665 470 395 470 75 125
HFE80S 900 590 515 683 225 155
HFE125S 1245 590 515 1020 225 155
HFE160S 1530 590 515 1310 225 155
HFE200S 1825 590 515 1605 225 155
HFE250S 1265 760 685 985 260 155
HFE315S 1510 760 685 1200 260 155
HFE400S 1820 760 685 1512 260 155
Figure 7 - Dimensional Drawing
F
E
INLETS
AD
B
C
OUTLETS
P&TR
SPECIFICATIONS

Rinnai Australia - 17 - HOTFLO Electric Storage Tanks Operating/Installation Manual
Table 1 - Specifications
Model Numbers
HFE40S18
HFE40S24
HFE40S36
HFE40S48
HFE80S18
HFE80S24
HFE80S36
HFE80S48
HFE125S18
HFE125S24
HFE125S36
HFE125S48
HFE160S18
HFE160S24
HFE160S36
HFE160S48
HFE200S24
HFE200S36
HFE200S48
HFE250S36
HFE250S48 HFE315S36 HFE315S48 HFE400S36 HFE400S48
Rated Capacity 40 80 125 160 200 250 315 400
Heating Elements
Available
Watts (W)
1800
2400
3600
4800
1800
2400
3600
4800
1800
2400
3600
4800
1800
2400
3600
4800
2400
3600
4800
3600
4800 3600 4800 3600 4800
Tank Rated
Pressure (kPa) 1000 850
P & TR Valve
Pressure rating
(kPa) 1000 850
Expansion Control
Valve (ECV)
Pressure Rating
(kPa)
850 700
ECV Fitted
Fit Pressure
Limiting Valve
(PLV) if mains
pressure
exceedes: (kPa)
680 550
Recommended
Pressure Limiting
Valve (PLV)
Pressure Rating
(kPa)
500 (1) 500 (1)
ECV NOT Fitted
Fit Pressure
Limiting Valve
(PLV) if mains
pressure
exceedes: (kPa)
800 680
Recommended
Pressure Limiting
Valve (PLV)
Pressuring Rating
(kPa)
500 (1) 500 (1)
Thermostat setting
(Max) 75° C
Hot & cold water
connections 3/4” (20 mm)
Ingress Protection
Rating (AS 1939) IPX4
Note (1) - A 500 kPa PLV is supplied with all tanks. It must be fitted if the Mains Pressure exceeds the limits shown. If the mains
pressure is within the limits shown fitment of the PLV is optional. However, it is recommended that the PLV is fitted in all
installations as it aids water and energy conservation.
Electrical power
cord length
(metres) 1.5
Legend
HF - Hotflo
E - Electric Tank
50 - Rated Capacity of the tank
S - Single heating element
24 - First two digits of the Heating element rating eg. 24 = 2400 Watts
SPECIFICATIONS

Rinnai Australia - 18 - HOTFLO Electric Storage Tanks Operating/Installation Manual
The benefits conferred by this warranty are in addition to all other rights and remedies in respect of
the product which you have under the Trade Practices Act and similar State or Territory Laws.
Given installation and application is in accordance with the manufacturers specifications and
instructions, Rinnai water heaters and components are warranted by Rinnai for the cost of labour and
components in the event of defects arising from faulty materials and/or workmanship in accordance
with the Terms in Table 2 and Warranty Conditions and Exclusions stated in this document.
Definition of Domestic Use
The warranty periods that are allocated under "Domestic Use" are based on hot water usage patterns
of a typical family.
Rinnai "Domestic Use" warranty periods apply to:
1. Water heaters installed to supply heated water to domestic dwellings.
2. Water heaters when installed to supply heated water to commercial installations such as motel
units, hotel rooms, caravans, mobile homes, nursing homes, retirement village complexes and
other care institutions and like accommodation provided that maximum preset delivery
temperatures for gas boosted models do not exceed 65°C and do not exceed 70°C for electrically
boosted models and that the hot water systems are not installed as component(s) of centralised
bulk hot water systems and the installation does not incorporate building flow and return systems.
Definition of Commercial Use
The warranty periods that are allocated under "Commercial Use" are for Rinnai water heater(s)
installed at premises such as commercial and industrial buildings, cafes, caravan parks and sporting
complexes. "Commercial Use" warranty applies to:
1. Water heater(s) supplying central shower blocks.
2. Water heater(s) supplying kitchens used for the bulk preparation of food.
3. Water heater(s) pre-set to exceed 65°C for gas boosted systems and pre-set to exceed 70°C for
electric boosted systems.
4. Water heater(s) used in commercial or industrial heating processes.
5. Water heater(s) used in hydronic space heating installations.
6. Any application that uses Rinnai water heater(s) in conjunction with building flow and return
systems.
7. Water heater(s) installed as component(s) of centralised bulk hot water system(s).
Table 2 - Warranty Terms
Parts 5 Years
Labour 3 Years
Parts 1 Year
Labour 1 Year
Parts 1 Year
Labour 1 Year
Parts 1 Year
Labour 1 Year
Cylinder
All Other Parts
(Valves etc.)
Warranty Terms - Rinnai Hotflo Mains Pressure
Vitreous Enamel Storage Electric Water Heaters
Domestic Applications
Commercial Applications
Cylinder
All Other Parts
(Valves etc.)
WARRANTY

Rinnai Australia - 19 - HOTFLO Electric Storage Tanks Operating/Installation Manual
WARRANTY CONDITIONS
1. All terms of this warranty are effective from date of installation of the hot water system and the
attending service person reserves the right to verify this date by requesting a copy of the
certificate of compliance prior to the commencement of any warranty work. Certificates of
compliance must be issued by the installer by law in all States and Territories of Australia.
2. All Rinnai water heating components must be installed in accordance with the manufacturers
installation instructions, current AS 3000, AS 3500.4 and AS 5601, local regulations and
municipal building codes. All Rinnai solar water heating components must only be installed,
commissioned and removed by persons authorised by local regulations to do so. All Rinnai solar
water heating components must only be serviced and repaired by Rinnai approved technicians.
3. All Rinnai water heaters must be operated and maintained in accordance with manufacturers
operating instructions.
4. The warranty applies only to the components supplied by Rinnai. It does not apply to
components supplied by others, such as pressure limiting valves, isolating valves, non return
valves, electrical switches, pipework, electrical cables and fuses.
5. Where the water heater or it's components have not been sited in accordance with the installation
instructions or installed such that normal service access is difficult, a service charge may apply. At
the discretion of the attending service person, if access is deemed dangerous service will be
refused. Any work required to gain reasonable access to water heater components may also be
chargeable at the discretion of the attending service person (for example, removal of cupboards,
doors, walls, or the use of special equipment to move components to floor level).
6. Where a failed component is replaced under warranty, the balance of the original appliance
warranty will remain effective. The replacement part or appliance does not carry a new warranty.
7. Rinnai reserve the right to transfer functional components from defective appliances if they are
suitable.
8. Rinnai reserve the right to have the installed product returned to the factory for inspection.
9. Water chemistry and impurity levels must be within the limits specified in Table 3.
Table 3 - Water chemistry and impurity limits for all water heating systems
WARRANTY EXCLUSIONS
The following exclusions apply to all Rinnai water heating systems. They may cause the warranty to
become void and may result in a service charge and costs of parts (if required):
1. Accidental damage, acts of God, failure due to misuse, incorrect or unauthorised installations,
attempts to repair the heater other than by a Rinnai approved service technician.
2. Where it is found that there is no fault with the water heater and the issue is related to the
plumbing installation or is due to the failure of water, electric or gas supplies or corrosive
atmosphere.
3. Where the water heater has failed directly or indirectly as a result of excessive water pressure,
negative water pressure (partial vacuum) or water pressure pulsation.
4. Subject to any statutory provisions to the contrary, claims for damage to walls, foundations etc. or
any other consequential loss either directly or indirectly due to leakage from the water heater or
any other faults.
5. This warranty does not cover the effects of sludge and sediment as a result of connection to a
water supply from unfiltered sources such as a spring, dam, bore, river, or the entry of sludge and
sediment into the water supply for any other reason.
6. Operating the water heater and components when not completely filled with water.
Total Dissolved
Solids (TDS)
mg/litre or ppm
Total Hardness
(as CaCO3)
mg/litre or ppm
Saturation Index
(Langelier) pH Dissolved CO2
mg/litre or ppm
Up to 650 Up to 200 Up to + 0.4 @ 65°C 6.5 to 8.5 Up to 18
WARRANTY