Rinnai EHP32-HPST265 User manual

Operation / Installation Manual
Rinnai Split Heat Pump Water Heater
Model: EHP32-HPST265
This appliance must be installed in accordance with:
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Rinnai Australia i Operation & Installation Manual
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Rinnai Australia ii Operation Manual
IMPORTANT INFORMATION & WARNINGS ............................................................................. 1
SAFETY & REGULATORY INFORMATION............................................................................................................ 1
SCALDS HAZARDS ................................................................................................................................................ 2
OPERATION PRINCIPLE ........................................................................................................................................ 3
SAFETY DEVICES .................................................................................................................................................. 4
EXCESSIVE DISCHARGE FROM SAFETY DEVICES ........................................................................................... 4
TURNING ‘OFF’ THE WATER HEATING SYSTEM ................................................................................................ 5
TURNING ‘ON’ THE WATER HEATING SYSTEM.................................................................................................. 5
DRAINING AND FILLING ........................................................................................................................................ 5
WATER QUALITY.................................................................................................................................................... 5
MAINTENANCE ....................................................................................................................................................... 5
SERVICING & REPAIR................................................................................................................ 6
TROUBLE SHOOTING GUIDE................................................................................................................................ 6
SPECIFICATIONS & DIMENSIONS ............................................................................................ 8
SYSTEM SPECIFICATIONS 8
DIMENSIONS & CLEARANCES.............................................................................................................................. 9
INSTALLATION GENERAL....................................................................................................... 10
LOCATION............................................................................................................................................................. 10
WATER QUALITY.................................................................................................................................................. 11
STORAGE TEMPERATURE ................................................................................................................................. 11
SANITARY FIXTURES DELIVERY TEMPERATURE ........................................................................................... 11
FITTINGS, VALVES & PIPES................................................................................................................................ 12
INSTALLATION PROCEDURE ................................................................................................. 13
WARRANTY............................................................................................................................... 17
CONTACT INFORMATION ....................................................................................................... 20
TABLE OF CONTENTS

Rinnai Australia iii Operation & Installation Manual
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Rinnai Australia 1 Operation & Installation Manual
IMPORTANT INFORMATION & WARNINGS
SAFETY & REGULATORY INFORMATION
DO NOT operate this system before reading the manufacturers instructions.
This appliance must be installed, commissioned and serviced by an authorised person in
accordance with all applicable local rules and regulations.
Access covers of water heating system components will expose 240V wiring and MUST be
removed by an authorised person.
This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure they DO NOT play with the appliance.
Any power leads from the water heater system components MUST BE plugged into an external
weatherproof electrical outlet. If the power supply cord of any water heating components is
damaged, it MUST BE replaced by an authorised person in order to avoid a hazard, using genuine
replacement parts available from Rinnai. Take care not to touch the power plugs with wet hands.
Care should be taken not to touch the pipe work as it may be HOT! The pipes between the heat
pump and storage cylinder MUST BE copper, or alternative material pipes that may be supplied by
Rinnai. Plastic pipe is NOT suited to the water temperatures and pressures that may occur in the
system.
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 heat pump unless cylinder is full of water.
DO NOT insert fingers or objects into the air inlet or outlet. When the fan is rotating at high speed
it can cause injury.
NEVER use a flammable spray such as hair spray, lacquer, paint, etc near this unit as this may
cause a fire.
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.
WARNING

Rinnai Australia 2 Operation & Installation Manual
IMPORTANT INFORMATION & WARNINGS
SCALDS HAZARDS
HOT WATER CAN CAUSE SCALDS.
CHILDREN, DISABLED, ELDERLY AND THE INFIRM 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 OCCUR WHEN CHILDREN ARE EXPOSED DIRECTLY TO HOT WATER WHEN
THEY ARE PLACED INTO A BATH WHICH IS TOO HOT.
ALWAYS......
Test the temperature of the water with your elbow before placing your child in the bath, also carefully feel
water before bathing or showering yourself.
Supervise children whenever they are in the bathroom.
Make sure that the hot water tap is turned off tightly.
CONSIDER.....
Installing child proof tap covers or child resistant taps (both approaches will prevent a small hand being
able to turn on the tap).
Installing tempering valves or thermostatic mixing valves which reduce the hot water temperature
delivered to the taps. Your local plumbing authority may already require that these be fitted. Contact your
installer or local plumbing authority if in doubt.
NEVER…..
Leave a toddler in the care of another child. They may not understand the need to have the water
temperature set at a safe level.

Rinnai Australia 3 Operation & Installation Manual
IMPORTANT INFORMATION & WARNINGS
OPERATION PRINCIPLE
A heat pump operates by transferring energy from the ambient outside air into the water. Electricity is used to
operate the system, but not to heat the water. Because of this, less electricity is needed to heat the water.
The Rinnai split system comprises a separate heat pump module and water storage tank. The heat pump unit
includes a circulation pump which draws water from the storage tank and returns it to the tank at a higher
temperature. A temperature sensor in the tank is used to control the heat pump operation to achieve suitable tank
temperatures.
1. Cold water inlet connection
2. Water from storage tank to heat pump unit
3. Outlet air
4. Inlet ambient air
5. Water from heat pump unit to storage tank
6. Storage Cylinder temperature sensor lead
7. Hot water outlet connection
3
7
21
5
4
Front of Heat Pump Unit
Rear of Heat Pump Unit
6

Rinnai Australia 4 Operation & Installation Manual
IMPORTANT INFORMATION & WARNINGS
SAFETY DEVICES
The water heating system is supplied with various safety devices including temperature sensors, overheat sensors
and switches and a Pressure & Temperature Relief (PTR) valve. These devices must not be tampered with or
removed. The water heating system must not be operated unless each of these devices is fitted and is in working
order.
EXCESSIVE DISCHARGE FROM SAFETY DEVICES
Pressure & 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 above. 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. This may dislodge any foreign matter
and alleviate the problem. If this does not alleviate the problem contact Rinnai.
Operate the easing gear regularly to remove any lime deposits and to verify that it is not blocked.
DO NOT tamper with or remove safety devices.
DO NOT operate the water heater unless all safety devices are fitted and in working order.
DO NOT block or seal the PTR Valve and drain pipe.
Pressure & 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.
Never block the outlet of the PTR valve or it’s drain line for any reason. The easing gear must be
operated at least every 6 months to remove lime deposits and verify that it is not blocked. Failure
to do this may result in the water heater failing.
If the valve does not discharge water when the easing gear lever is opened, 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.
NEVER replace the P&TR valve with one which has a higher pressure rating than is specified for
your water heater.
WARNING
Twist cap until water
flows from drain line
Lift lever until water
flows from drain line
(Lower lever gently!)
WARNING
WARNING

Rinnai Australia 5 Operation & Installation Manual
IMPORTANT INFORMATION & WARNINGS
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, do so by switching off the electric power supply to the heat pump unit.
TURNING ‘ON’ THE WATER HEATING SYSTEM
1. Switch on the electric supply to the heat pump unit. Water heating will now occur as required. It may take a
number of hours before hot water is available.
DRAINING AND FILLING
1. Draining or filling of the complete system normally only occurs during installation or servicing and must be
carried out by an authorised person.
2. Draining water from the heat pump unit is necessary if the power will be shut off to the unit and snow or frost
conditions are expected. It is not necessary to drain the storage cylinder for this purpose. Arrange for an
authorised person to carry out this task.
WATER QUALITY
The water quality of most public supplies is suitable for the water heater system. The water quality from bore wells
is generally unsuitable for the water heating system. Refer to separate ‘Warranty Terms & Conditions’ document
for water quality parameters and how they affect the warranty conditions. If in doubt about water quality, have it
checked against the parameters listed in the warranty conditions. The system is not suitable as a pool or spa
heater.
MAINTENANCE
Operate the easing gear of the P&TR as described under “SAFETY DEVICES” - “Pressure & Temperature Relief
(P&TR) Valve” on page 4 and the easing gear of the ECV as described under “EXCESSIVE DISCHARGE FROM
SAFETY DEVICES” - “Expansion Control Valve (ECV) - if fitted” on page 4.
DO NOT turn power off to the heat pump unit if snow or frost conditions are expected as
components in the system may be damaged by freezing. If power needs to be turned off or power
failure occurs and freezing conditions are expected, the water needs to be drained from the heat
pump unit. Follow the procedure described below in the section “DRAINING AND FILLING”. It is
not necessary to drain the storage cylinder.
WARNING

Rinnai Australia 6 Operation & Installation Manual
SERVICING & REPAIR
Rinnai’s 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 (if fitted) must be replaced by an authorised
person at intervals not exceeding 5 years or more frequently in areas where the water is classified as scaling water.
If the power supply cord or plug to the heat pump unit is damaged, they must be replaced by an authorised person
in order to avoid a hazard. The power supply cord and plug must be replaced by a genuine replacement part
available from Rinnai.
TROUBLE SHOOTING GUIDE
Use the following trouble shooting guide to avoid the need for an unnecessary service call.
Insufficient or No Hot Water
Problem Remedy
Heat Pump Unit • Ensure the heat pump is plugged into the power point and turned
on.(note that the compressor will not start up for 3 minutes after
power is turned on).
• Check to ensure the electric isolating switch at the switchboard
(usually marked “Hot water or water heater” is turned on.
• Check to ensure the electric fuses for the heat pump are intact.
Excessive hot water consumption • Often end users are surprised at the amount of hot water used,
especially when showering. If the amount of hot water used
during the day exceeds the storage capacity of the cylinder, it is
likely there will be insufficient hot water.
Pressure & Temperature Relief (P&TR)
Valve continually discharging water
• 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 in “EXCESSIVE DISCHARGE FROM
SAFETY DEVICES” on page 4. 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) continually
discharging water
• 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 in “EXCESSIVE DISCHARGE FROM
SAFETY DEVICES” on page 4. This may dislodge any foreign
matter and alleviate the problem. If this does not alleviate the
problem contact Rinnai.
Ambient conditions too hot • To protect the components of the heat pump unit it may not
operate when the ambient temperature is higher than 45°C.
Air inlet or outlet of heat pump blocked • To protect the components of the heat pump unit, it will not
operate is there is insufficient air flow through the unit. Remove
any obstructions from the air inlet and outlet.

Rinnai Australia 7 Operation & Installation Manual
SERVICING & REPAIR
No Water From The Tap
Problem Remedy
Restriction in the hot tap or failure of the
cold water supply to the water heater
• Check for water flow at the other taps and that the cold water
isolation valve is fully open.
High Electricity Bill
Problem Remedy
Excessive hot water consumption • See entry under the heading 'Insufficient hot water'
High Electricity Tariffs • The electricity tariff will determine the running costs of the
system. It is important the end user is aware of the applicable
tariffs. Contact your electricity supplier to confirm what these
tariffs are.
Water Flow Fluctuations
Problem Remedy
One or more hot taps opened at the same
time
• More than one or two hot taps in use at the same time may
cause a decrease in the hot water flow from the taps.
• Is there more than one or two hot taps open, or are appliances
such as a dishwasher or washing machine, in use at the same
time?
• Ensure only one or two hot taps are on at one time.
Water Hammer
Problem Remedy
Hot and cold water plumbing in the
premises
• Have a plumber check clipping of hot and cold water pipe work
and install a pressure limiting valve and water hammer arrestor
as required.
Heat Pump Ices Up
Problem Remedy
Defrosting function • The heat pump has a built in defrosting function which may
operate and remove any ice.

Rinnai Australia 8 Operation & Installation Manual
SPECIFICATIONS & DIMENSIONS
SYSTEM SPECIFICATIONS Rinnai Split Heat Pump Water Heater model: EHP32-HPST265
Connections Storage Cylinder - Cold inlet ISO 7.1 ¾” RP
Storage Cylinder - Hot Outlet ISO 7.1 ¾” RP
Storage cylinder – return from heat pump module ISO 7.1 ¾” RP
Storage Cylinder - P&TR Valve connection ISO 7.1 ½” RP
Heat pump module – connections to & from storage cylinder ISO 7.1 ¾” RP
P&TR Valve ISO 7.1 ½” RP
Pressure & Temperature Relief (P&TR) Valve
(Supplied)
Setting 850 kPa
Rating 10 kW
Expansion Control Valve (ECV)
(To be supplied by installer) Setting 700 kPa
Max Supply Pressure With ECV 550 kPa
Without ECV 680 kPa
Pressure Limiting Valve (PLV)
(To be supplied by installer) Rating 500 kPa
Maximum length of piping between heat pump
& storage cylinder.
(To be supplied by installer)
For each pipe
4 metres of ½” copper
tube to Australian
Standard AS1432
EHP32 Heat Pump Module Rated Input 1.9 kW
Maximum Water Pressure 850 kPa
Maximum Energy Output
(This value is the maximum possible from the unit and should
be used to ensure the P&TR valve is suitably sized)
6.0 kW
Refrigerant Type / Mass R134A / 750 g
Ingress Protection IP24
Net Weight 54 kg
Power Supply 240 V, 50 Hz.
Startup
Protection
When the power is first turned on to the heat pump or power is
cut then restored, the unit will not start for 3 minutes to protect
the condenser.
Defrosting
Function
When the condenser temperature reaches 0°C, the defrosting
mode will operate for 10 minutes or until the condenser
temperature reaches 10°C.
Protection
Systems
The heat pump has protection systems that will stop the
operation of the unit if:
• The air inlet or outlet are blocked
• Voltage is out of nominal range of 207V to 255V
• Over pressure or over temperature in the refrigerant system
Refrigerant
Compressor oil Type: NEO 32 Quantity: 520 ml
HPST265 Storage Cylinder Net Weight 56 kg
Weight Filled 321 kg
Insulation of piping
between heat pump &
storage cylinder.
(To be supplied by
installer)
Ultraviolet and weather resistant closed cell elastomeric
insulation, minimum thickness 13mm, thermal conductivity
0.045 W/(m.K) or less (Armacell HT/Armaflex or equivalent).
Table 1.

Rinnai Australia 9 Operation & Installation Manual
SPECIFICATIONS & DIMENSIONS
DIMENSIONS & CLEARANCES
500
765
660
600
295
275
790
1500
300
200 300
600
1700
1490
300
210
Bleed
Valves
Fig.1
Heat Pump Unit
Minimum Clearances
To Hot
Water
Outlets
Water
Supply

Rinnai Australia 10 Operation & Installation Manual
INSTALLATION GENERAL
LOCATION
The heat pump module MUST BE installed externally.
The storage cylinder may be installed internally or externally. In most cases it will be installed externally adjacent
to the heat pump module.
The storage cylinder 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 storage cylinder 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 all components are installed at ground or floor level. The storage cylinder MUST BE
installed in a vertically upright position. All components MUST BE accessible without the use of a ladder or scaffold.
The storage cylinder MUST NOT be installed in roof spaces.
Ensure the pressure and temperature pressure relief (P&TR) valve and any access covers have sufficient
clearances and are accessible for service and removal.The information on the rating plates must also be readable.
The storage cylinder MUST BE installed in freestanding mode on a level and stable base. For external installations,
the storage cylinder should be mounted on a concrete base at least 50mm thick or on well seasoned, evenly spread
hardwood slats with a thickness of at least 25mm. Where property damage can occur as a result of water leakage,
the storage cylinder MUST BE installed with a safe tray (overflow tray) and drain in accordance with AS 3500.4.
Ensure the storage cylinder DOES NOT stand on wet surfaces.
The heat pump module MUST BE installed in freestanding mode on a level and stable base. The heat pump
module should be mounted on a concrete base or evenly spread hardwood slats. Ensure the heat pump module
DOES NOT stand on wet surfaces.
The air inlet and outlet of the heat pump module MUST BE away from areas with strong wind and MUST BE be
provided with sufficient clearances as per those shown in Fig. 1 on page 9.
The heat pump module MUST BE raised from the ground to enable any condensate to drain away.
The heat pump module requires an AC 240 V power supply. A weatherproof 240 V, 10A earthed power point must
therefore be provided adjacent to the module. Extension leads and power boards MUST NOT be used.
The storage cylinder MUST BE positioned close enough to the heat pump to ensure that the connecting pipe
lengths DO NOT exceed 4 metres per pipe.
Installation and commissioning must be performed by authorised persons. Systems must be
installed in accordance with these instructions and all regulatory requirements which exist in your
area including those in relation to manual lifting, working at heights and on roofs. Applicable
publications and regulations may include:
• AS/NZS 3500.4 Heated Water Services
• AS/NZS 3000 Wiring rules
• Building Codes of Australia (BCA)
• Local Occupational Health and Safety (OH&S) regulations
• Any other relevant regulations
This appliance is not suitable for use as a domestic spa pool or swimming pool heater.
Heat pumps and hot water storage cylinders are heavy and bulky items. Australian States and
Territories have a Principal Occupational Health and Safety (OH&S) Act which contains
requirements relating to the handling of large, bulky or awkward items. Persons installing heat
pump system must be aware of their responsibilities and be adequately trained and qualified, in
accordance with local OH&S requirements.
IMPORTANT

Rinnai Australia 11 Operation & Installation Manual
INSTALLATION GENERAL
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 PTR 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 cylinder water supply
If the water heater is supplied by a low pressure gravity or cylinder water supply, the bottom of the supply cylinder
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.
STORAGE TEMPERATURE
To meet regulatory requirements the thermostat control on the heat pump water heater is factory preset to 60°C
and cannot be altered.
SANITARY FIXTURES DELIVERY TEMPERATURE
Water temperatures over 50°C can cause severe scalds. Children, disabled and the elderly are at the highest risk
of 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 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'.
Install temperature limiting devices in accordance with the instructions provided by the manufacturer.

Rinnai Australia 12 Operation & Installation Manual
INSTALLATION GENERAL
FITTINGS, VALVES & PIPES
Fittings Supplied with EHP32
Fittings Supplied with HPST265
Fittings Supplied by installer
The following items are to be supplied by the installer:
• A cold water expansion control valve (ECV).
An ECV must be fitted in Western Australia and South Australia to the cold water supply to the storage
cylinder to comply with local regulations. An ECV is recommended in all other geographical areas where the
water supply has a tendency to cause scaling. This will reduce hot water discharge from the Pressure and
Temperature Relief (P&TR) valve which minimises wear on this valve.
• A stop cock, non return valve and line strainer.
Combination valves incorporating two or more of these functions (such as 'Trio' valves) are suitable. These are
fitted to the cold water supply to the storage cylinder by the installer.
• Cold water supply and hot water discharge pipe work to and from the storage cylinder
• An approved pressure limiting valve is required if the maximum rated water supply pressure in is exceeded
see Table 1 “SYSTEM SPECIFICATIONS” on page 8 for details.
• Connecting ½ inch copper pipe work between the heat pump module and the storage cylinder connections.
(Maximum of 4m for each length of pipe)
• Connecting copper pipe work insulation.
Water Pipes
All pipe work to hot water outlets should be insulated with Polythene foam or equivalent insulation to optimise
performance and energy efficiency. Such insulation may be mandatory under local regulations. Insulation must be
weatherproof and UV resistant if exposed.
Copper pipe work between heat pump module and storage cylinder must be insulated with Ultraviolet and weather
resistant closed cell elastomeric insulation, minimum thickness 13mm, thermal conductivity 0.045 W/(m.K) or less
(Armacell HT/Armaflex or equivalent).
Water pipe sizing should be performed in accordance with AS/NZS 3500.4.
To prevent damage to the storage cylinder 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.
Fitting
Description
Filter
¾Rp x ¾Rp
Fitting
Illustration
Quantity 1
Table 2.
Fitting
Description
P&TR Valve
½R
Restrictor
¾Rp x ¾R
Copper olive compression
nut ¾G + Olive + nipple ¾R x ¾G
Nipple
¾R x ¾R
T adaptor
¾R x ½Rp x ½ G
Socket
¾Rp
T
¾Rp x ¾Rp x ¾Rp
Fitting
Illustration
Prt.No. / Qty 11004784 / 1 27801712 / 1 32201713 / 4 17201005 / 1 19001018 / 1 18601018 / 1 19001011 / 1
Table 3.

Rinnai Australia 13 Operation & Installation Manual
INSTALLATION PROCEDURE
Fig. 2
1. Position the heat pump
• Position the heat pump in accordance with the section “LOCATION” on page 10.
2. Connect the P&TR valve
• Connect the P&TR valve to the uppermost fitting of the storage cylinder (refer to Diagram C of Fig. 2).
• The P&TR pressure rating must be suited for the cylinder as specified in table 1, page 8.
• The P&TR valve must be adequate for the thermal loading applied to the storage cylinder.
• The supplied P&TR valve input rating is 10.0 kW. The P&TR valve rating MUST EXCEED the total input
from the heat pump.
For example, the maximum output from the EHP32 is 6.0 kW (see table 1, page 8.). This is less than 10.0
kW, hence the supplied P&TR valve is of sufficient capacity.
• Use Teflon thread tape on the valve, never use hemp or other sealing materials. Ensure the tape does not
protrude past the end of the thread, which could result in it hanging over the end of the thread and blocking
the water passage through the valve. The P&TR valve must be installed on the connection marked 'hot
water outlet' near the top of the cylinder.
• Leave the valve outlet pointing down. Tighten the valve using the spanner flats - never use the valve body.
3. Connect fittings between heat pump module and storage cylinder.
• Refer to Diagrams A & B of Fig. 2.
Fig. 3
If freezing or snow conditions are likely, and power is likely to
be switched off from the system then provision needs to be
made to allow the heat pump to be drained of water.
Isolation valves should be fitted between the storage cylinder
and heat pump so the heat pump can be drained without the
cylinder being drained as shown in Fig. 3.
P&TR Valve
T adaptor
Nut 3/4
3/4 nipple
R to R
Flow Restrictor
3/4R to 3/4Rp
Filter 3/4Rp
Socket 3/4 Rp
Copper Pipe
supplied by
installer
Olive 3/4
Copper Pipe
Supplied by
Installer
Temperature Sensor
(inserts into drywell)
3/4 T
3/4 nipple R to R
Kinco Olive 3/4
Nut 3/4
3/4 nipple
R to G
3/4 nipple
R to G
Nut 3/4
Olive 3/4
Diagram
C
Diagram
B
Diagram
A
Cold
Water
Intlet
Isolation
Valve
Isolation
Valve
IMPORTANT

Rinnai Australia 14 Operation & Installation Manual
INSTALLATION PROCEDURE
4. Connect Cold Water supply
• Connect cold water supply, Pressure Limiting Valve (PLV) and or Expansion Control Valve (ECV).
• Connect cold water supply to the inlet T on the storage tank (refer to Diagram A of Fig. 2 on page 13).
Connect PLV and ECV if needed.
• A stop cock, non return valve and line strainer MUST BE fitted.
5. Connect Hot Water Discharge
• Connect the pipe work supplying hot water to the premises to the hot water discharge outlet of the T
adaptor (refer to Diagram C of Fig. 2 on page 13).
7. Connect Drain Lines to the P&TR and ECV
• Independent 15mm copper pipes must be fitted to the drain outlets of the P&TR and ECV. Each pipe must
be open to atmosphere and run with a continual downward grade in a frost free environment to a visible
discharge point. Drain lines must not exceed 9 metres in length.
• Valves or other restrictions must not be placed in the relief valve drain outlet line.
8. Connect Heat Pump module to electricity supply
• The heat pump must be connected using the supplied power lead to a weatherproof 240 V, 10A earthed
power point as specified in the section “LOCATION” on page 10.
• It must be connected to a continuous tariff (not off peak).
• A Residual Current Circuit Breaker is recommended for the power supply to this appliance (this may be a
mandatory requirement in some states or jurisdictions.
A temperature limiting device may be required as detailed in the section “SANITARY FIXTURES
DELIVERY TEMPERATURE” on page 11.
6. Insert Temperature Sensor Probe into sensor well
• The temperature sensor lead from the heat pump needs to be
placed in the sensor well on the storage cylinder (refer to Diagram
A of Fig. 2 on page 13 and Fig. 4).
It must be secured to prevent it falling out and sealed in place with
thermoplastic putty or non acidic silicon sealant to prevent corrosion
(non acidic silicon sealant does not contain acetic acid “vinegar” as
the curing agent).
Fig. 4
It is important that this probe is installed as specified. Failure
to do so will lead to malfunction or lack of hot water and is not
covered by Rinnai warranty.
Some water will drip from lines during heating of water in the storage cylinder. It is recommended
to discharge directly above a drain.
The power supply to the heat pump module MUST NOT be activated until the system is filled with
water.
WARNING
Storage cylinder
temperature
sensor lead
Storage cylinder
sensor well
IMPORTANT
NOTE
WARNING

Rinnai Australia 15 Operation & Installation Manual
INSTALLATION PROCEDURE
9. Fill the system.
• Open hot water tap at sink.
• Open the stop cock in the cold water main supply line.
• Allow the system to fill and the air to bleed through the tap.
• Turn off the hot tap at the sink when water flows freely without any air bubbles or air bursts.
• Bleed any remaining air from the P&TR valve.
• If leaks are detected turn off power to the heat pump, repair any leaks and repeat the filling process to
remove any air.
• If no leaks are detected water heating can commence. The heat pump will start up after the 3 minute
protection time.
10. System Checks
• Has the installation been completed as shown in Fig. 2 on page 13 and finished neatly?
• Has the temperature sensor lead been fitted into the storage cylinder and secured so it will not fall out?
• Have any Temperature Limiting Devices been installed and commissioned according to manufacturers
instructions?
• Are the clearances specified in Fig. 1 on page 9 complied with to ensure suitable air flow through the
system and access for servicing.
11. Finishing the Installation.
• After testing is completed explain to the householder the functions and operation of heat pump water
heater components.
• Explain to the householder the need to drain the heat pump if freezing conditions are likely and power is
likely to be shut off.
• Also explain to the householder the importance of carrying out Maintenance in accordance with this
manual.
• Leave this Manual with the householder.
Ensure building occupants are warned to stay clear of the system components, and tap outlets
since hot water or steam may be discharged from pipes or components.
• Open the air bleed valves on the heat pump module (Fig. 5).
• Turn on power to the heat pump unit.
• Open the top lid of the heat pump unit and locate the button
marked FORCE. (PU will display in the indicator). This will
cause the circulation pump to operate without the compressor.
• Once all the air is bled close the air bleed valves. Press
FORCE again to turn off the pump. Replace the lid of the heat
pump system.
• If leaks are detected turn off power to the heat pump, repair
any leaks and repeat the filling process to remove any air.
Fig. 5
WARNING
Cold Water Inlet
Air Bleed Valve
Heat Pump
Module
Hot Water outlet
Air Bleed Valve

Rinnai Australia 16 Operation & Installation Manual
INSTALLATION PROCEDURE
12. Draining Instructions
Draining the heat pump module only
• Turn off power to the heat pump module.
• Close the cold water mains supply stop cock
• Close the isolation valves between the storage tank and heat pump.
• Disconnect the piping from the heat pump (as shown in Fig. 6) and allow the water to drain from the pipes.
• Reconnect the pipe work, but do not open the isolation valves until the heat pump is ready to be refilled.
Fig. 6
Draining the heat pump module and storage cylinder
• Turn off power to the heat pump.
• Close the cold water mains supply stop cock
• Ensure any isolating valves between the heat pump and the storage cylinder are open.
• Open a hot tap to relieve pressure
• Disconnect the hot outlet near the top of the storage cylinder
• Disconnect the cold inlet near the bottom of the storage cylinder.
• The system will now drain completely.
Isolation
Valve
Isolation
Valve
Cold
Water
Intlet