Rinnai EHP32 Operation And Installation Manual

Hoto hot water heat
pump

Operation and installation guide

Model: EHP32

This appliance shall be installed in accordance with:

- Manufacturer’s installation instructions

- Local regulations and municipal building codes

Installation, servicing and repair shall be carried out only by
authorised personnel.

Installer, please leave this manual with the customer for
future reference.

Warning
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life.

For more information about buying, living and servicing
of Rinnai appliances call: 0800 RINNAI (0800 746 624)

Rinnai New Zealand Limited
105 Pavilion Drive, Mangere, Auckland
PO Box 53177, Auckland Airport, Auckland 2150

Phone: [phone], Fax: [phone]
Email: [e-mail]
Web: www.rinnai.co.nz, youtube.com/nz

Important:

cnt:

Suitability 4
Warning about hot water 5
Safety information 6
How it operates 7
Turning the system off and on 8
General information 9
Troubleshooting guide 10
Specification 11
Dimensions and clearances 12
Heat pump checklist 13
Connecting to a storage tank 14
Attaching the temperature sensor 15
Piping 16
Filling and commissioning 17
Protection against freezing 18
Handover to the customer 18
Draining instructions 19
Limited warranty 20
Installer details 22
Proof of purchase 23

4 | Hoto hot water heat pump operation & installation 11790-C 03-12

Suitability

Suitable for:

- external domestic applications

- connection to mains pressure hot water cylinders

- NZ geographical zones 1 and 2 only, refer map below

*RADIUS

Zone 1

Zone 2

Zone 3

Not suitable as a spa or swimming pool heater.

Water quality

Not suitable for certain water chemistries. For further information, refer to the warranty information at the back
of this guide.

Geothermal hot spots

The Rinnai Hotflo hot water heat pump is not warranted against corrosion in geothermal areas such as Rotorua,
where high levels of sulphur dioxide are present in the atmosphere.

Distance between the heat pump and storage tank

If the heat pump and storage tank are more than 5 m apart an R5043 adjustable flow restrictor must be
purchased as a separate item to complete installation.

IMPORTANT

Hoto hot water heat pump operation & installation 11790-C 03-12 | 5

Warning about hot water

Warning about hot water

Water temperatures above 55 °C can cause instant severe burns, such as scalding
and may even result in death. Those most at risk; children, disabled, elderly, and the
sick. Hot water at 65 °C, a common water temperature in New Zealand, can severely
burn a child in less than half a second. At 55 °C it takes half a minute.

Always

- Test the water temperature with your elbow before placing your child in the
bath and feel the water yourself before bathing or showering

- Supervise children whenever they are in the bathroom

- Make sure the hot water tap is turned off

Consider

Installing child proof tap covers or child resistant taps, both will prevent a child being
able to turn on the tap.

Never

Leave a toddler in the care of another child. They may not understand the need to
have the water temperatures set at a safe level.

6 | Hoto hot water heat pump operation & installation 11790-C 03-12

Supervise children

Children should be supervised to
ensure they DO NOT play with the
appliance.

Electrical

Access covers of the water heating
system components conceal 230 V
wiring and must only be removed
by an authorised person.

The power lead from the heat
pump must be plugged into an
external weatherproof electrical
outlet. If the power supply cord is
damaged, it must be replaced by
an authorised person in order to
avoid a hazard, using a genuine
replacement part available from
Rinnai. Take care not to touch any
power plugs with wet hands.

Pipe work may be hot

Care should be taken not to touch
the pipe work as it may be hot.

DO NOT

Do not:

- Place articles on or against this
appliance

- Store chemicals or flammable
materials near this appliance

- Operate with the panels or
covers removed from this
appliance

- Activate the heat pump unless
the tank is full of water

- Insert fingers or objects into
the air inlet/outlet—when the
fan is rotating at high speed it
can cause an injury

Never use flammable sprays

Never use a flammable spray such
as hair spray, lacquer, paint etc.
near this unit as this may cause a
fire.

Safety information

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.

WARNING

Hoto hot water heat pump operation & installation 11790-C 03-12 | 7

How it operates

The heat pump operates by transferring the energy from the ambient outside air into the
water. Electricity is used to operate the system, but not to heat the water, so less electricity is
used.

The Rinnai hot water heat pump is made up of two separate components; a heat pump and a 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.

Water from storage
tank to heat pump

Outlet air

Water from heat pump
to storage tank

Storage tank
temperature
sensor lead

Rear of heat pump unit

Inlet ambient air

Front of heat pump unit

8 | Hoto hot water heat pump operation & installation 11790-C 03-12

Turning the system o󱐯 and on

Turning the water heating system off

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 it off, switch off the electric power supply to the heat pump unit.

Do not turn the 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, this must be carried out by an authorised person. It is not necessary to drain the storage tank.

Turning the water heating system on

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.

WARNING

Hoto hot water heat pump operation & installation 11790-C 03-12 | 9

General information

Defrosting function

The heat pump has an inbuilt defrosting function. This requires power to prevent damage in freezing conditions.
DO NOT disconnect the power if there is a likelihood of freezing without draining the unit.

Draining and filling

Draining and filling of the complete system normally only occurs during installation or servicing and must be
carried out by an authorised person.

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 tank). Arrange for an authorised person to carry
out this task.

Servicing

Rinnai has a maintenance/service and spare parts network with personnel who are fully trained and equipped
to give the best advice on your Rinnai appliance. If your system needs maintenance and/or servicing, please call
Rinnai (0800 746 624) from a land line and select option one for a service centre in your area.

For reliable operation Rinnai hot water systems should be serviced every two years. Regular maintenance and
servicing is not covered by the Rinnai warranty.

Do not attempt to carry out any work on your system other than that mentioned in the troubleshooting section.
If you have any faults or problems, contact your installer or call Rinnai.

10 | Hoto hot water heat pump operation & installation 11790-C 03-12

Troubleshooting guide

Lack of hot water, or no
hot water

Is there electricity supply to the
heat pump?

Check that the heat pump is
plugged into the power point and
turned on—the compressor will
start approximately three minutes
after the power is turned back on.

Check that the isolating switch
marked ‘Hot Water’ or ‘Water
Heater’, at the meter box, is
switched on. Check also 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 the fuse or
tripping of the circuit breaker
indicates a fault that must be
investigated by an authorised
tradesperson.

Are you using more hot water
than you think?

Often you don’t realise how
much hot water is actually being
used, especially when showering.
Typical flow rates for showers is
around 8-10 litres per minute.
Conduct a simple experiment by
placing a measured bucket under
your shower for ten seconds
and multiply by six to obtain the
amount of water produced over a
minute.

If your result is significantly more
than the rates above, you may
want to consider installing flow
restrictors. These are available at
all good plumbing outlets.

Cold water relief valve
discharging continuously?

It is normal for the cold water
relief valve to discharge a small
quantity of water through the
drain line while the heat pump
is operating to heat the water. If
water is discharging continuously
when the heat pump is not
operating, there may be a fault
with one of the valves—contact
your installer to discuss.

High electricity bills

If you think your electricity bill is
too high, check:

- The electricity tariff on your
last bill, has this changed from
previous bills?

- If the cold water relief valve is
discharging continuously.

- Water usage, has this
increased (guests, winter etc.)

- Temperature probe/sensor is
installed as per instructions on
page 15.

Hoto hot water heat pump operation & installation 11790-C 03-12 | 11

Specication

System specifications Rinnai split heat pump water heater: Model EHP32

Max. pipe length between heat
pump & storage tank (installer to
supply)

For each pipe Refer page 16

EHP32 heat pump unit Rated input 1.9 kW

Max. water pressure 850 kPa

Max. energy output (this is the max. possible
from the unit and should be used to ensure
tank TPR valve is suitably sized)

6.0 kW

Refrigerant type/mass R134A/750 g

Ingress protection IP24

Net weight 60 kg

Noise level Fan approx. 55 dB(A)

Power supply 240 V, 50 Hz

Start up protection

When the power is first turned on to the heat pump or when power is cut
then restored, the unit will not start for three minutes, this is to protect
the compressor.

Ambient temperature operating range (-7 to 45 °C)

When the ambient temperature is below 2 °C the tank temperature
achieved may be lower. When the ambient temperature is high, the air
supply fan will run at a lower speed.

Defrosting function

The heat pump has protection systems that will stop the operation of the
unit if; the air inlet/outlet is blocked, voltage is out of nominal range
(207-255 V), over pressure or over temperature in the refrigerant system.

Refrigerant compressor oil

Type: Neo 32, quantity: 520 ml

Cylinder settings

Pressure Limiting Valve (PLV) 500 kPa

Cold water pressure relief 700 kPa

Temperature & Pressure Relief Valve 850 kPa

Please note:
Installer may need to change the existing valves on the cylinder to meet these kPa ratings

12 | Hoto hot water heat pump operation & installation 11790-C 03-12

Dimensions and clearances

500

765

660

600

325

275

790

1500

300

003002

Bleed

Valves

Heat Pump Unit

Minimum Clearances

Hoto hot water heat pump operation & installation 11790-C 03-12 | 13

Heat pump checklist

F Minimum clearances maintained for correct operation and access.

F 500 mm clearance above the unit.

F Suitably drained catch pan installed where leakage could cause damage.

F Positioned in a location where noise from operation will not disturb occupants or neighbours, particularly

overnight.

F 10 A weatherproof 3-pin socket installed within 1.5 m of the connection of the heat pump.

DO NOT hard wire this appliance. Costs associated with disconnecting from hard wiring are not
covered by warranty.

F Temperature sensor cable run between the heat pump and storage tank. The supplied cable has a length of

9.5 m.

F Maximum water pressure is 850 kPa.

F If water drips from the compressor are not acceptable, a plastic drain elbow (supplied) is fitted to the bottom

of the unit (as shown below), and a drain line is installed and run to a suitable disposal point.

F Storage tank valves and water temperature delivery must be in accordance with G12/AS3500.

Heat pump and tank less than 5 m apart

F Supplied flow restrictor installed at heat pump outlet, and pump set to speed 3.

Heat pump and tank greater than 5 m apart

F Rinnai part number R5043 flow restrictor installed and adjusted to 3 litres per minute with a suitable pump

speed.

IMPORTANT

14 | Hoto hot water heat pump operation & installation 11790-C 03-12

Connecting to a storage tank

Connecting to a Rinnai Hotflo storage tank

The riser and dip tubes in the Hotflo storage tank need to be positioned to suit the installation using the dip
tube tool (purchased separately, part number 11143). Insert the tool into the dip or riser tube to be reversed and
rotate 180°.

cold
supply

opon 1
from heat

pump

hot

supply

opon 2
from heat

to
heat pump

dip tube tool

pump

As supplied Heat pump configuration 1 & 2

Connecting to other storage tanks

Connections to storage tanks which are not heat pump or solar ready can be made in a number of ways—some
examples are shown below.

cold
supply

hot
supply

TPR

hot
supply

TPR

cold

supply

from
heat
pump

to
heat pump

cold
supply

hot
supply

TPR

from
heat

pump

to

Insert dip
tube

Heatshrink if
required to
prevent
corrosion.

Ensure probe is
sensing tank temp.

heat pump

As supplied RMC 4-way fitting Combine TPR & hot outlet

Hoto hot water heat pump operation & installation 11790-C 03-12 | 15

Attaching the temperature sensor

The temperature sensor lead (supplied) must be run from the heat pump to the
storage tank.

IMPORTANT

Ensuring and maintaining a good
temperature probe contact with
the storage tank will ensure
accurate temperature readings.
Failure to install the temperature
probe/sensor as instructed could
cause the heat pump to run for
longer periods, and result in high
electricity bills for the customer.

1. Remove the element box
cover from the storage tank.

2. Apply a small quantity of
a suitable heat transfer
compound, such as Unick
(available from Dick Smith
electronics) along the back of
the temperature probe and
contact fixing.

3. Place the temperature probe
as high up inside the element
box as possible, and run the
sensor cable down the side of
the element box.

4. Cover all components in
the element box with the
insulation provided, and refit
the element box cover.

5. Remove the electrical cover
plate from the right hand side
of the heat pump. Plug the
other end of the temperature
sensor into the matching
connector. Refit the cover
plate.

6. Run the temperature sensor
over the required length and
fix in place with suitable clips.
Gather any excess cable and
secure with cable ties in a
convenient position.

16 | Hoto hot water heat pump operation & installation 11790-C 03-12

Piping

Pipes must be insulated with ultraviolet and weather resistant closed cell insulation having
a minimum thickness of 13 mm and thermal conductivity of greater than 0.045 W/m.K.
Examples; Armacell HT and Armaflex.

1. Attach the supplied water filter to the heat pump water inlet.

2. Fit suitable isolating valves to the heat pump connections at the tank.

Costs associated with draining storage tanks to service the heat pump, where valves are not fitted,
are not covered by warranty.

3. Select pipe size with reference to the table below. Maximum pipe length is the total pipe installed (e.g. 14 m
would be 7 m flow plus 7 m return).

Pipe inner diameter Maximum pipe length
12 mm 14 m
15 mm 22 m
19 mm 30 m

IMPORTANT

Hoto hot water heat pump operation & installation 11790-C 03-12 | 17

Filling and commissioning

1. Fill the storage tank and heat
pump until water flows freely
from the outlets in the house.

2. Bleed the air from the heat
pump and prime before
starting the heat pump.

Failure to bleed all air
from the heat pump
can lead to failure of
the circulation pump.
This is not covered by
warranty.

3. Open shut-off valves SV1 and
SV2. Open bleed valves BV1
and BV2. Once the water is
running from the drain hoses
attached to BV1 and BV2
(without air bubbles), BV1 can
be closed followed by SV1.

4. Once water (without air) is
running from the BV2 drain,
close BV2.

5. Close SV2 and open SV1.
Open BV1. Once water is
running from the BV1 drain
(without air), close BV1. Open
SV2.

6. Remove the top cover from
the heat pump.

Identify the mains
voltage connections and
take care to avoid them.

7. Plug in the heat pump power
supply. The LED display on the
PCB will display the current
temperature reading of the
temperature sensor. After
three minutes delay, operation
will commence.

8. Open the central bleed screw
on the pump housing briefly
to remove any remaining air
from the heat pump.

9. Allow the heat pump to run
for at least 15 minutes to
verify it is operating correctly.
If operation ceases and P1
is displayed on the LED, this
indicates water circulation is
not sufficient and the priming
process must be repeated.

10. If the heat pump and tank
are more than 5 m apart and
the R5043 adjustable flow
restrictor is fitted, adjust
the pump speed and flow
restrictor to achieve a 3 litre
per minute circulating flow.

11. Replace the top cover of the
heat pump.

IMPORTANT

WARNING

SV1

SV2

Storage
Cylinder

BV1

BV2

Flow
Restrictor

Strainer

Hotflo hot
water heat
pump

Flow restrictor

- ≤ 5 m use 3.5 mm brass orifice supplied

- > 5 m use R5043 adjusted to 3 L/min

18 | Hoto hot water heat pump operation & installation 11790-C 03-12

Protection against freezing

Supplied with this guide are two labels warning against disconnecting the power supply
where freezing conditions are likely. These should be fixed adjacent to the heat pump outdoor
power point and on the main fuse/switchboard of the house.

Handover to the customer

After testing is completed, explain to the householder the functions and operation of the heat
pump water heater system.

Explain to the householder the need to drain the heat pump if power is likely to be shut off and if freezing
conditions could occur. Also explain to the householder the importance of carrying out maintenance in
accordance with this manual.

Leave this guide with the householder.

Hoto hot water heat pump operation & installation 11790-C 03-12 | 19

Draining instructions

Draining the heat pump unit

1. Turn off the power to the heat
pump.

2. Close the cold water mains
supply stop cock.

3. Close the isolation valves
between the cylinder and heat
pump.

4. Disconnect the piping from
the heat pump as shown and
allow the water to drain from
the pipes.

5. Reconnect the pipe work,
but do not open the isolation
valves until the heat pump is
ready to be refilled.

Draining the heat pump unit
and tank

1. Turn off the power to the heat
pump.

2. Close the cold water mains
supply stop cock.

3. Ensure any isolating valves
between the heat pump and
the cylinder are open.

4. Open a hot tap to relieve
pressure.

5. Disconnect the hot outlet near
the top of the tank.

6. Disconnect the cold inlet near
the bottom of the tank.

The system will now drain
completely.

To avoid water damage to
the heat pump and/or tank,
ensure water is able to
drain freely away from both
appliances.

Cold water inlet

Air bleed valve

Heat pump

Hot water outlet

Air bleed valve

Draining the heat pump - step 4

IMPORTANT

20 | Hoto hot water heat pump operation & installation 11790-C 03-12

Limited warranty

Rinnai warranty summary

HOTFLO HOT WATER HEAT PUMP

Compressor All other

components

Parts 3 years 3 years

Labour 3 years 3 years

All terms of the warranty are
effective from the date of
installation of the Rinnai Hotflo
Heat Pump. Proof of installation
will be required.

General warranty terms

Rinnai reserves the right to
make modifications and change
specifications and its parts without
notice.

For the purposes of the Consumer
Guarantees Act 1993, Rinnai only
guarantees the availability of repair
facilities and spare parts for the
express warranty periods recorded
in the Rinnai warranty summary
table.

If the Rinnai Hotflo Heat Pump
is being acquired for personal,
domestic or household use,
this warranty does not limit any
consumer rights or guarantees
that may apply under the
Consumer Guarantees Act 1993.
If the product is being acquired
for the purposes of a business,
the provisions of the Consumer
Guarantees Act 1993 do not apply
and no other warranties (either
express or implied by law) apart
from those stated in this warranty
apply.

Warranty terms and conditions

All terms of this warranty are
effective from the date of
installation. The attending service
person reserves the right to verify
this date.

All Rinnai appliances must
be installed, commissioned,
serviced, repaired and removed
in accordance with the
manufacturer’s instructions,

local regulations, and municipal
building codes by persons
authorised by local regulations to
do so.

All appliances must be operated
and maintained in accordance
with the manufacturer’s operating
instructions.

The warranty applies only to the
components supplied by Rinnai.
It does not apply to components
supplied by others, such as,
isolating valves, electrical switches,
pipe work, electrical cables, fuses,
and where applicable components
supplied by others, but not limited
to these.

Where the appliance has not
been sited in accordance with
the installation instructions or
installed such that normal service
access is difficult, a service charge
will apply. If at the discretion of
the attending service person the
installation is deemed illegal or
access is dangerous, service will
be refused. Any work required to
gain access to the appliance will
be chargeable by the attending
service person (for example,
removal of walls, or the use
of special equipment to move
components, but not limited to
these).

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.

Rinnai reserve the right to transfer
functional components from
defective appliances if they are
suitable.

Rinnai reserve the right to have the
installed product returned to the
factory for inspection.

Where the heat pump is installed
outside the metropolitan area
or further than 40 km from a
Rinnai authorised service centre,

travel costs shall be the owner’s
responsibility.

Warranty exclusions

The following exclusions may
cause the warranty to become
void and will result in a service
charge and costs of parts (if
required).

- Accidental damage and acts
of God.

- Failure due to abuse or
misuse, improper maintenance
or improper storage.

- Failure due to incorrect or
unauthorised installations.

- Failure or damage caused by
alterations, service or repair
work carried out by persons
other than a Rinnai service
person or service centre.

- Where the heat pump has
failed directly or indirectly as
a result of poor water quality
outside the limits specified.

- Where it is found that there
is no fault with the appliance
and the issue is related to the
installation or is due to power
failure.

- Subject to any statutory
provisions to the contrary,
Rinnai does not accept:

a. liability for consequential

damage or any incidental
expenses resulting
from any breach of the
warranty

b. claims for damage to

buildings or any other
consequential loss either
directly or indirectly due
to leaks from the heat
pump or any other faults

Hoto hot water heat pump operation & installation 11790-C 03-12 | 21

Water quality

Water quality outside the limits, as set down below, will void this warranty. Water quality tests must be carried
out at the customer’s own cost. Rinnai will reimburse any reasonable test costs where water quality is within the
limits tabled.

Water quality and impurity limits

TDS (Total

Dissolved

Solids)

Total

Hardness

CaCO

3

Alkalinity

(as CaCO3)

Dissolved
(free) CO

2

pH Chlorides Magnesium Sodium Iron Langelier

Index

Up to 600

mg/L or ppm

Up to 200

mg/L or

ppm

Up to 200

mg/L or

ppm

Up to 25

mg/L or

ppm

6.5-8.5 Up to 300
mg/L or

ppm

Up to 10

mg/L or ppm

Up to 150

mg/L or

ppm

Up to 1
mg/L or

ppm

Between

-1.0-0.8

Most metropolitan water supplies fall within these limits. If you are unsure about water quality, please contact
Rinnai and we will provide you with details of an authorised agency able to test your water for compliance
to Rinnai standards. If sludge or foreign matter is present in the water supply, a suitable filter should be
incorporated in the water supply. Some examples of water quality issues where water may need to be treated:

- Hard water (areas including Wanganui)

- Aggressive water (areas including Christchurch)

- Both hard and aggressive water (some bore water)

22 | Hoto hot water heat pump operation & installation 11790-C 03-12

Installer details

Company name:

Installer name:

Address:

Phone: Mobile:

Signed: Date:

Hoto hot water heat pump operation & installation 11790-C 03-12 | 23

Please keep these details in a safe place for future reference.

ATTACH YOUR PROOF OF
PURCHASE HERE:

RECORD YOUR DETAILS
OF PURCHASE BELOW:

Retailer:

Retailer address:

Date of purchase:

Product details:

Proof of purchase

Rinnai.co.nz

Experience our innovation

0800 746 624

http://www.youtube.com/rinnainz