Rheem MPi Series Installation Instructions Manual

This water heater must be installed and serviced by a qualified person.

Please leave this guide with the householder.

Installation Instructions

Air Sourced Integrated

Heat Pump Module

MPi Series

PATENTS

This water heater may be protected by one or more patents or registered designs

in the name of Rheem Australia Pty Ltd.

TRADE MARKS

®

Registered trademark of Rheem Australia Pty Ltd.

™ Trademark of Rheem Australia Pty Ltd.

Note: Every care has been taken to ensure accuracy in preparation of this publication.

No liability can be accepted for any consequences,

which may arise as a result of its application.

3

CONTENTS

HOUSEHOLDER – This installation instruction booklet is intended for

the installer but you may find it of interest.

Installation .............................................................................................. 4

Heat Pump And Tank Assembly ......................................................... 13

Connections – Electrical ..................................................................... 30

Commissioning .................................................................................... 32

Water Supplies ..................................................................................... 38

Warranty Note ...................................................................................... 40

4

INSTALLATION

INSTALLATION STANDARDS

The water heater must be installed:

by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local

codes and regulatory authority requirements.

In New Zealand, the installation must also conform with Clause G12 of the New
Zealand Building Code.

WATER HEATER APPLICATION

This water heater is designed for use in a single family domestic dwelling for
the purpose of heating potable water. Its use in an application other than this
may shorten its life.

If this water heater is to be used where an uninterrupted hot water supply is
necessary for the application or business, then there should be redundancy
within the hot water system design. This should ensure the continuity of hot
water supply in the event that this water heater was to become inoperable for
any reason. We recommend you provide advice to the system owner about
their needs and building backup redundancy into the hot water supply system.

This water heater is recommended for connection to a minimum 16 hour per
day power supply for a 325 litre storage tank and a 24 hour per day power
supply for a 410 litre storage tank.

STORAGE TANK AND HEAT PUMP MODULE

The heat pump water heater is made of two main components, the storage tank
and the heat pump module. For transport and handling (weight) purposes both
items are shipped separately and designed to be assembled at the installation
site. The water heater must not be operated until both components are
assembled. Refer to “Heat Pump and Tank Assembly” on page 13.

Take care when handling the heat pump module. The jacket of the heat pump
module needs to be handled gently so as not to cause damage.

INSTALLATION

5

Care must be taken during transportation and handling. Do not lay the
heat pump module down and do not tilt the heat pump module or the heat
pump and storage tank assembly more than 30° from the vertical. This will

displace the compressor lubricating oil. If the heat pump module or heat pump
and storage tank assembly has been tilted more than 30° from the vertical
during handling, it will need one hour to drain back before the power to the
water heater can be switched on, otherwise damage to the compressor may
result.

All packaging materials must be removed from the heat pump module prior to
its installation. This includes the removal of the cardboard base of the carton
from the underside of the module.

A clearance of 300 mm is required perpendicular from both the front air inlet
louvres and the outlet grille to any wall or obstruction. Refer to the dimensions

diagram on page 9.

The heat pump module must be installed on and fully supported by a stable
base.

The water heater must not be installed in an area with a corrosive atmosphere
where chemicals are stored or where aerosol propellants are released.
Remember the air may be safe to breathe, but the chemicals may attack the
materials used in the heat pump system.

Warning: This heat pump module is designed to be installed with a purpose

built water heater storage tank and may not be used for any other purpose.

Note

These instructions cover only the installation of the heat pump module onto the
storage tank and the connections made between the heat pump module and
storage tank. Refer to the Owner‟s Guide and Installation Instructions supplied
with the storage tank for further information including:

where and how to locate the heat pump water heater
how to connect the heat pump water heater to the electricity supply and to

the plumbing system

how to operate the heat pump water heater
what to do if something goes wrong.

SAFE TRAY

Where damage to property can occur in the event of the water heater leaking,
the water heater must be installed in a safe tray. Construction, installation and
draining of a safe tray must comply with AS/NZS 3500.4 and all local codes
and regulatory authority requirements.

INSTALLATION

6

FREEZE PROTECTION

The water heater has a freeze protection system. The freeze protection system
will protect the water heater from damage, by preventing ice forming in the
waterways of the water heater, in the event of freezing conditions occurring.

If the ambient air temperature falls below 1°C and the heat pump is not
operating, the system will operate the circulator periodically. During this freeze
protection cycle, the circulator will operate for thirty (30) seconds and then rest
for fifteen (15) minutes, before the cycle is recommenced. Water is circulated
from the storage tank through the heat pump circuit, to prevent freezing in the
connecting pipe work and heat pump module. The green LED will flash a series
of four (4) flashes whilst the circulator is operating.

The water heater has NO WARRANTY for freeze damage if power is
unavailable at the water heater.

Warning: In areas where the ambient air temperature may fall below 1°C,
power must be available to the water heater at all times to prevent freezing in
the heat pump circuit.

MAINS WATER SUPPLY

Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required. Refer to the Owner‟s Guide
and Installation Instructions supplied with the storage tank for the position of
the pressure limiting valve.

Model

325, 410

Relief valve setting

1000 kPa

Expansion control valve setting *

850 kPa

Max. mains supply pressure

With expansion control valve

680 kPa

Without expansion control valve

800 kPa

Min. mains supply pressure

200 kPa

* Expansion control valve not supplied with the water heater.

A minimum water supply pressure of 200 kPa is required to enable the heat
pump circulator and heat pump system to operate effectively.

INSTALLATION

7

TANK WATER SUPPLY

If the water heater is supplied with water from a tank supply and a minimum
water supply pressure of 200 kPa at the water heater cannot be achieved, then
a pressure pump system must be installed to allow the heat pump circulator to
operate and avoid air locks in the circuit. Care must be taken to avoid air locks.
The cold water line from the supply tank should be adequately sized and fitted
with a full flow gate valve or ball valve.

CONDENSATE DRAIN

A drain line should be fitted to the heat pump module‟s condensate drain to
carry the discharge clear of the water heater. The drain line can be extended
using 12 mm rigid poly hose or conduit. The pipe work from the condensate
drain should be as short as possible and fall all the way from the water heater
with no restrictions. It should have no more than three right angle bends in it.
The outlet of the drain line must be in such a position that flow out of the pipe
can be easily seen - but arranged so water discharge will not cause damage or
nuisance.

The condensate drain line must not be connected to the relief valves
drain lines but may discharge at the same point.

WARNING

This water heater is only intended to be operated by persons who have the
experience or the knowledge and the capabilities to do so. This water heater is
not intended to be operated by persons with reduced physical, sensory or
mental capabilities i.e. the infirm, or by children. Children should be supervised
to ensure they do not interfere with the water heater.

This water heater uses 240 V AC electrical power for operation of the control
systems and the electrically operated components. The removal of the access
cover(s) will expose 240 volt wiring. They must only be removed by a qualified
person.

ENVIRONMENT

At the end of the service life of the heat pump water heater and prior to the
water heater being disposed of, a person qualified to work with refrigerants
must recover the refrigerant from within the sealed system. The refrigerant
must not be vented to atmosphere. Phone Rheem Service or their nearest
Accredited Service Agent to arrange for an inspection.

INSTALLATION

8

TO TURN OFF THE WATER HEATER

To turn off the water heater:

Switch off the electrical supply at the isolating switch to the water heater.
Close the cold water isolation valve at the inlet to the water heater.

Notes

The freeze protection system will be rendered inoperable if electrical

power is not available at the water heater.

Damage caused by freezing due to the unavailability of power at the water

heater is not covered by the Rheem warranty.
Refer to “Warranty Note” on page 40.

If the power has been switched off to the water heater and there is a risk of

freezing, then it is necessary to drain the water heater.

Refer to “Draining the Water Heater” in the Owner‟s Guide and Installation

Instructions supplied with the heat pump storage tank.

VICTORIAN CUSTOMERS

Notice to Victorian Customers from the Victorian Plumbing Industry
Commission. This water heater must be installed by a licensed person as
required by the Victorian Building Act 1993.

Only a licensed person will give you a Compliance Certificate, showing that the
work complies with all the relevant Standards. Only a licensed person will have
insurance protecting their workmanship for 6 years. Make sure you use a
licensed person to install this water heater and ask for your Compliance
Certificate.

INSTALLATION

9

DIMENSIONS AND TECHNICAL DATA

300 MIN

ELECTRICAL
CONNECTION

VENTILATION
CLEARANCE

1018

H

574

HOT

OUTLET

COLD

INLET

E

544

872

B

K

275

100

WALL

AIR

INLET

AIR INLET

C

AIR

OUTLET

300 MIN

VENTILATION
CLEARANCE

CONDENSATE DRAIN

TPR
VALVE

AIR INLET

AIR

OUTLET

300 MIN

F

A

D

Rheemglas 551 Series

INSTALLATION

10

A

D

1018

H

574

E

544

872

K

100

WALL

AIR

INLET

AIR INLET

C

AIR

OUTLET

300 MIN

CONDENSATE DRAIN

TPR
VALVE

AIR INLET

AIR

OUTLET

300 MIN

VENTILATION
CLEARANCE

300 MIN

VENTILATION
CLEARANCE

HOT

OUTLET

COLD

INLET

ELECTRICAL

CONNECTION

L

F

275

B

M

RheemPlus 554 Series

INSTALLATION

11

Models

Rheemglas
RheemPlus

551325
554325

551410
554410

Storage tank capacity

litres

325

410

Boost capacity 1.8 kW

litres

100 -

2.4 kW*, 3.6 kW*

litres

180

200

Dimensions A

mm

1631

1842

B

mm

894

961

C

mm

638

686

D

mm

1317

1479

E

mm

114

127

F

mm

162

650

H

deg

32

30

K

mm

619

686

554 series only L

mm

262

286

554 series only M

mm

1006

1073

Models

Rheemglas

551325

551410

Weight tank empty

kg

88

112

Weight heat pump

kg

42

42

Weight system empty

kg

130

154

Weight system full

kg

455

564

Models

RheemPlus

554325

554410

Weight tank empty

kg

90

112

Weight heat pump

kg

42

42

Weight system empty

kg

132

154

Weight system full

kg

455

564

Heat pump module model no

182550 (R)

Maximum rated power input

watts

3600

Rated heat pump power input

watts

800

Booster element ratings

kW

1.8, 2.4, 3.6

Refrigerant type

R134a

Refrigerant circuit pressure

kPa

3000

* The boost capacity of a 2.4 kW or 3.6 kW low watts density heating unit if used is
100 litres (325 litre storage tank) or 125 litres (410 litre storage tank).

Technical data is subject to change.

INSTALLATION

12

TYPICAL INSTALLATION – OUTDOOR LOCATION

Rheemglas 551 Series Shown

13

HEAT PUMP AND TANK ASSEMBLY

STORAGE TANK AND HEAT PUMP MODULE

The heat pump water heater is made of two main components, the storage tank
and the heat pump module. For transport and handling (weight) purposes both
items are shipped separately and designed to be assembled at the installation
site. The water heater must not be operated until both components are
assembled.

The water heater is to be installed at ground or floor level and must stand
vertically upright on a stable base, as acceptable to local authorities, of a
minimum 900 mm wide x 650 mm deep. The heat pump module must be fully
supported by the stable base.

HEAT PUMP MODULE

The heat pump module is shipped in a box containing two hand holes to
facilitate easy handling and lifting. The heat pump module is to be mounted
against the side of the storage tank.

CAUTION: The heat pump module weighs approximately 42 kg. Use the hand
holes provided in the sides of the packaging. Good lifting practice should be
followed.

There are two flexible hoses provided inside the heat pump module. The
flexible hoses are to be withdrawn from the module and fixed to the two water
fittings on the heat pump storage tank, during the assembly procedure.

There are two connection points located on the underside of the control box in
the heat pump module to which the power cable and tank sensor cable from
the heat pump storage tank are connected, during the assembly procedure.

STORAGE TANK

The storage tank is designed to receive the heat pump module. There are two
water fittings located at the side of the storage tank to which flexible hoses from
the heat pump module are connected, during the assembly procedure.

A power cable is housed behind the lower cover and a tank sensor cable is
located adjacent to and above to the lower cover of the storage tank. The
power cable is to be withdrawn from behind the front cover and the tank sensor
cable unfurled and both connected to the control box in the heat pump module
during the assembly procedure.

HEAT PUMP AND TANK ASSEMBLY

14

storage tank heat pump module heat pump water heater

KIT

There is a kit (PN 299276) supplied with the heat pump module and a kit
supplied with the 410 model heat pump storage tank (PN 290122). The
components supplied in the kit and required for the installation are:

299276

Kit Installation Heat Pump Module Integrated

Qty

122189

Installation instructions heat pump module integrated

1

052158

Saddle clamp 20 mm Clipsal 261/20

1

080021

Screw phillips pan head No. 8 x 13 zinc plated black

2

080156

Screw pack of 3 M6 x 12 HD bolts

2

080203

Stud M6 x 25 zinc plate

3

080204

Nut hex whizzlock M6

3

104767

Cover fan shroud

1

080191

Screw hilo 13-16 x 20 pan head combination zinc plated

1

104766

Plug plastic 13 mm black

1

290122

Kit Heat Pump Module Seal 410

Qty

087052

Cover strip heat pump housing top

1

160032

Tape foam 406E 18 mm x 7 mm thick

1

+

=

HEAT PUMP AND TANK ASSEMBLY

15

ASSEMBLY PROCEDURE

Warning: The heat pump must be assembled, plumbed and filled with

water prior to power being connected and switched on.
The following procedure should be followed to properly place the heat pump

module in position and connect to the storage tank:

1. Heat Pump Storage Tank: Remove all packaging including the carton

base from the heat pump storage tank and position in its intended location,
supported by a stable base.

The water connections may be on either the left or right hand side and
should be parallel to the wall.

The storage tank must be positioned at least 100 mm from the wall. If a
minimum clearance of 100 mm is not allowed for, the heat pump module
will not be able to be completely connected to the storage tank.

The storage tank must also be positioned such that when the heat pump
module is in position, there is a clearance of at least 300 mm
perpendicular from both the front air inlet louvres and the outlet grille to
any wall or obstruction.

300 MIN

H

574

B

K

275

100

WALL

AIR

INLET

AIR INLET

C

AIR

OUTLET

300 MIN

VENTILATION
CLEARANCE

CONDENSATE DRAIN

TPR
VALVE

Step 1

position storage tank at least 100 mm from the wall

and allow for at least 300 mm ventilation clearance

(refer table on page 11 for dimensions)

551 series shown above

HEAT PUMP AND TANK ASSEMBLY

16

2. Lower Front Cover: Remove the two screws securing the lower front

cover to the storage tank.

 Remove the lower front cover from the storage tank.

Step 2 Step 3
remove screws withdraw the power cable
from lower front cover

3. Power Cable: Withdraw the power cable, housed behind the lower front

cover, from the opening.

HEAT PUMP AND TANK ASSEMBLY

17

4. Mains Power Connection – 551 Series: Connect the mains power supply

wiring to the terminal block and earth connection inside of the lower front
cover.

 Secure the conduit to the side of the storage tank with the saddle

clamp and screws provided.
The saddle clamp must be positioned over the pilot holes provided,

otherwise the conduit will interfere with the heat pump module
installation.

Refer to “Connections – Electrical” on page 30.
Note: The power supply to the water heater must not be switched on until

the installation is complete, the water heater is filled with water and a
satisfactory megger reading is obtained.

Step 4

Connect wiring and secure conduit with saddle clamp

HEAT PUMP AND TANK ASSEMBLY

18

5. Lower Front Cover: Refit the lower front cover.

Step 5 Step 6
refit lower front cover remove tape from tank sensor cable

6. Tank Sensor Cable: Remove tape from tank sensor cable and unfurl.

HEAT PUMP AND TANK ASSEMBLY

19

7. Foam Tape: (410 litre storage tank only) – Retrieve the length of foam

tape from the kit supplied with the 410 storage tank.
The foam tape is to be applied to the bottom at the front of the 410 litre

storage tank.
The ends of the foam tape are to line up with the two vertical slots in the

jacket.
The mid point of the tape (lengthways) is to line up over the join between

the jacket of the storage tank and the jacket bottom.

 Remove the backing from the foam tape and apply the foam tape to

the storage tank.

FOAM
TAPE

REMOVE ADHESIVE
PAPER BACKING

LINE UP EDGES OF FOAM
TAPE UNDER SLOTS.

MID POINT OF FOAM TAPE
TO LINE UP OVER JOIN
BETWEEN JACKET AND
JACKET BOTTOM.

Step 7

apply foam tape to 410 litre storage tank

8. Heat Pump Module: Remove all packaging including the carton base

from the heat pump module and position in its intended location at the
storage tank.

CAUTION: The heat pump module weighs approximately 42 kg. Use the
hand holes provided in the sides of the packaging. Good lifting practice
should be followed.

HEAT PUMP AND TANK ASSEMBLY

20

9. Fan Cover Shroud: Retrieve the fan cover shroud, 20 mm screw and

black plastic plug from the kit bag.

 Remove the screw located immediately above the monitor label on

the front of the heat pump module and discard.

 Position the fan cover shroud over the fan cowl and slide the

recessed edge of the shroud under the lip of the heat pump module
top. It will slide under the top without having to remove any screws.

 Align the mounting hole at the bottom of the shroud with the screw

hole in the heat pump module located immediately above the monitor
label.

 Secure the fan cover shroud to the heat pump module with the 20 mm

screw provided.

 Insert the black plug provided into the recess to cover the head of the

screw.

FAN COVER

SHROUD

SCREW

PLUG

REMOVE AND DISCARD
EXISTING SCREW

Step 9

fit the fan cover shroud to the heat pump module

HEAT PUMP AND TANK ASSEMBLY

21

10. Cover Strip: (410 litre storage tank only) – Retrieve the length of rubber

cover strip from the kit supplied with the 410 storage tank.

 Line up one end of the cover strip with one end of the heat pump

housing black top, fitting the strip over the lip of the housing, ensuring
the jacket is hard up against the lip of the heat pump housing.

The cover strip will hold the jacket in position.

 Apply the cover strip along the full length of the lip of the heat pump

housing.

ASSEMBLY

DETAIL

COVER STRIP

COVER
STRIP

HEAT PUMP
HOUSING

HEAT PUMP
HOUSING

COVER
STRIP

Step 10

apply cover strip to heat pump housing

HEAT PUMP AND TANK ASSEMBLY

22

11. Heat Pump Module Cover: Remove the two screws securing the front

cover to the heat pump module.

 Remove the front cover from the heat pump module.

Step 11 and 13

remove front cover from heat pump module

and feed through cables

12. Position Heat Pump Module: Position the edge of the heat pump module

which is closest to the wall against the storage tank so the screw holes in
the module are adjacent to the nutserts in the storage tank.

13. Power Cable and Tank Sensor Cable: Feed the power cable from the

lower front cover and tank sensor cable through the heat pump module so
they protrude out of the front of the module.

14. Flexible Braided Hoses: Retrieve the loose ends of the two flexible

braided hoses from within the heat pump module, and withdraw through
the rear of the heat pump module.

HEAT PUMP AND TANK ASSEMBLY

23

15. Cold Hose Connection: Attach the flexible braided hose, marked with a

blue stripe through the braid and attached to the bottom of the heat
exchanger, to the ball valve fitting in the bottom connection on the storage
tank and marked “TO HEAT PUMP”.

 Tighten the swivel nut on the hose using a 24 mm spanner.

Tape or sealant is not required.

 Position the hose such that when the heat pump module is moved

and secured to the tank, it does not kink.

 Ball valve: Ensure the ball valve located in the connection fitting is in

the open position. In the open position, the slot is in line with the hose.

Step 15

attach flexible hose with blue stripe to inlet and ball valve in open position

HEAT PUMP AND TANK ASSEMBLY

24

16. Hot Hose Connection: Attach the flexible braided hose, marked with a

red stripe through the braid and attached to the top of the circulator, to the
non return valve fitting in the upper connection marked “OUTLET” in red
on the storage tank.

 Tighten the swivel nut on the hose using a 24 mm spanner.

Tape or sealant is not required.

 Position the hose such that when the heat pump module is moved

and secured to the tank, it does not kink.

Step 16

attach flexible hose with red stripe to outlet

17. Check Hoses: Check to ensure the flexible hoses are not kinked.

HEAT PUMP AND TANK ASSEMBLY

25

18. Cable Tab – 551 Series: Remove the tab on the side of the electrical

entry to the heat pump module to accommodate the electrical conduit.
Pliers or tin snips may be required to remove the tab.

Step 18

remove the tab on the side of the electrical entry to the heat pump module

19. Studs: Retrieve the three (3) studs from the kit and screw into the

three (3) threaded inserts on the side of the tank closest to the wall.
These studs will assist in aligning the heat pump module for connection to

the storage tank.

Step 19

screw in studs into threaded inserts

HEAT PUMP AND TANK ASSEMBLY

26

20. Position Heat Pump Module: Position the heat pump module against the

tank.

 Engage the tab at the bottom of the heat pump module, on the wall

side of the module, into the slot in the tank.

 Align the holes in the side of the heat pump module over the three

studs.

21. Flange Nuts: Screw the three flange nuts onto the studs to connect the

wall side of the heat pump module to the storage tank.

Steps 20 and 21

align heat pump module over studs and screw on flange nuts

22. Tab: Engage the tab at the bottom of the heat pump module, on the front

side of the module, into the slot in the tank.

23. Fixing Bolts: Screw in the three fixing bolts to connect the front side of

the heat pump module to the storage tank.

Step 23

screw in fixing bolts to connect heat pump module to storage tank

HEAT PUMP AND TANK ASSEMBLY

27

24. Tank Sensor Cable Connection: Insert the tank sensor cable plug to the

connector on the underside of the control box.
The plug is polarised and can only be inserted one way.

 Ensure the plug fully engages the locking feature on the connector.

25. Power Cable Connection: Insert the four pin power cable plug to the

connector on the underside of the control box.
The plug is polarised and can only be inserted one way.

Steps 24 and 25

connect power cable and tank sensor cable

HEAT PUMP AND TANK ASSEMBLY

28

26. Positioning of Water Heater: Complete final positioning of the water

heater.
Ensure the heat pump module is firmly seated on the level slab or solid

base.

27. Water Connections: Connect the cold water supply and the hot water

pipe work to the water heater.

 Connect the temperature pressure relief valve and its drain line.

Refer to “Connections – Plumbing” in the Owner‟s Guide and
Installation Instructions supplied with the storage tank.

28. Water Supply: Turn on the cold water supply and fill the water heater.

 Check the pipe work and the connection points for the flexible braided

hoses for leaks
Refer to “To Fill And Turn On The Water Heater” on page 32,

however the electrical supply should not be turned on at this stage.

29. Heat Pump Module Cover: Replace the heat pump module cover and re-

fit the two screws.

Step 29

replace heat pump module front cover

HEAT PUMP AND TANK ASSEMBLY

29

30. Electrical Cover – 554 Series: Remove the two screws securing the

electrical cover, adjacent to the temperature limiting valve cover, to the
storage tank.

 Remove the electrical cover from the storage tank.

Step 30

remove screws from electrical cover

31. Mains Power Connection – 554 Series: Connect the mains power supply

wiring to the terminal block and earth connection inside of the electrical
cover.

 Secure the conduit to the side of the storage tank with the saddle

clamp and screws provided.
Refer to “Connections – Electrical” on page 30.
Note: The power supply to the water heater must not be switched on until

the installation is complete, the water heater is filled with water and a
satisfactory megger reading is obtained.

Step 31 Step 32
connect wiring to terminal block refit electrical front cover

32. Electrical Cover – 554 Series: Refit the electrical cover.

33. Commissioning: Refer to “Commissioning” in the Owner‟s Guide and
Installation Instructions supplied with the storage tank.

30

CONNECTIONS – ELECTRICAL

The power supply to the water heater must not be switched on until the
water heater is filled with water and a satisfactory megger reading is

obtained.

MEGGER READING

When a megger test is conducted on this water heater, then the following
should be noted.

Warning: This water heater contains electronic equipment and 500 V
insulation tests must only be conducted between active and earth and between
neutral and earth. An active to neutral test WILL damage the electronics.

An insulation test result of between 100 KΩ and 660 KΩ for this water
heater is normal.

Typically the insulation resistance between live and earthed parts of an
electrical installation should not be less than 1 MΩ. However
AS/NZS 3000:2000 clause 6.3.3.3.2 „Results‟ states:

“The value of 1 MΩ may be reduced to:

0.01 MΩ for sheathed heating elements or appliances; or
a value permitted in the Standard applicable to electrical equipment.”

This model water heater is categorised as a „stationary class 1 motor operated
appliance‟ and has been tested to AS/NZS 3350.1:2002 clause 16 „Leakage
current and electric strength‟ and has passed the requirements of this

Standard. Therefore, this model water heater complies with the condition stated
in AS/NZS 3000:2000 clause 6.3.3.3.2 (b).

ELECTRICAL CONNECTION

All electrical work and permanent wiring must be carried out by a qualified
person and in accordance with the Wiring Rules AS/NZS 3000 and all local
codes and regulatory authority requirements.

This water heater is recommended for connection to a minimum 16 hour per
day power supply for a 325 litre storage tank and a 24 hour per day power
supply for a 410 litre storage tank.

CONNECTIONS – ELECTRICAL

31

WIRING DIAGRAM

Electrical Circuit for Heat Pump – Robertshaw “ST” Thermostat

Dwn

Ch'd

App'd by

SHARP CORNERS TO BE BROKEN , UNLESS STATED

DISTRIBUTION:

REV

ECO No. DETAILS

BY

CHD

DATE

RHEEM AUSTRALIA PTY. LTD

UNLESS OTHERWISE STATED

ALL DIMENSIONS IN mm.

TOLERANCES

This drawing and the information contained herein is the sole property of

Rheem Australia Pty. Ltd, is strictly confidential and may not be used or disclosed

without the written consent of Rheem Australia Pty. Ltd.

Rev

SPECIFICATION

3RD ANGLE

PROJECTION

CCD

R

AD

WH13527

New drawing issued..

CCD

HWO

6/13

COM

NC

NO

COMP-ACOMP-N

FAN-N

FAN-A

PUMP-N PUMP-A

NEUTRAL

EARTH

COMPRESSOR

CAPACITOR

FAN

CAPACITOR

CONTROL

BOARD

CONTROL BOARD

ENCLOSURE

LED

BLUE

BLACK

GREEN/YELLOW

RED

BLUE

BLACK

F

F

F

F

T3 - ELMT

M F

1

2

COMNO

NC

COIL

Push

button

M

F

F

F

M

serial

port

PROG

1

1 1

PUMP

FAN

S

C

R

THERMOSTAT

HEATER

ELEMENT

COMPRESSOR

A

E

N

LOWER TANK

THERMISTOR

(T0)

CABLING IN CONDUIT

INSIDE TANK JACKET

PUMP PLUG

COMPRESSOR PLUG

FAN

PLUG

BLACK

BROWN

BLUE

BLUE

BLUE

BLUE

BLACK

RED

GREEN/YELLOW

RED

WHITE

RED

GREEN/YELLOW

GREEN/YELLOW

BROWN

BLACK

LIGHT

RED

BLUE

LIGHT RED

GREEN/YELLOW

GREEN/YELLOW

M

M

M

1

3

4

2

1

1

3

4

2

3

2

CABLE SET

TANK

HP

SW

HPSWPLUG

F

1

2

3

LED

RED

RED

RED

BLUE

BLACK

1

2

1

3

4

2

1

1

3

4

2

3

2

4

1

2

3

1

2

3

1

2

3

1

2

1

234

1

2

GREEN/YELLOW

GREEN/YELLOW

GREEN/YELLOW

GREEN/YELLOW

1

5

23

4

BLUE

RED

RED

BLUE

YELLOW

BLACK

RED

BLACK

WHITE

BLACK

BLACK

RED

RED

GREEN

GREEN

EVAPORATOR

THERMISTOR

COMPRESSOR

THERMISTOR

HEATER MODULE ASSEMBLYTANK ASSEMBLY

F

1

2

M

1

2

3

M

1

2

BLACK

BLACK

BLACK

M

1

2

3

GREY

GREY

CONDENSER

THERMISTOR

F

1

2

3

BLACK

BLACK

YELLOW

BLUE

WHITE

RED

M

POWER PLUG

4

1

2

3

T0 - TANK

T2 - COMP

T1 - EVAP

32

COMMISSIONING

TO FILL AND TURN ON THE WATER HEATER

The power supply to the water heater must not be switched on until the
water heater is filled with water and a satisfactory megger reading is

obtained.

Open all of the hot water taps in the house (don‟t forget the shower).
Open the cold water isolation valve fully to the water heater.

Air will be forced out of the taps.

Close each tap as water flows freely from it.
Check the pipe work and the connection points for the flexible braided

hoses for leaks

Switch on the electrical supply at the isolating switch to the water heater.
Set the timer if one is installed.

If it is necessary to adjust the outlet temperature of a RheemPlus model, refer
to “Outlet Temperature Compensation Adjustment – RheemPlus” in the

Owner‟s Guide and Installation Instructions supplied with the heat pump

storage tank.
Note: The water heater is preset in the factory to allow it to commence

operating with either the heat pump or booster heating unit immediately power
is turned on for the first time. If power is turned on and then off at its
installation, the water heater may take up to forty five (45) minutes to
commence operating when the power supply is switched on again. This forty
five (45) minute period can be overridden during the commissioning procedure
if the power was inadvertently turned on and then off again. Refer to “System

Reset” on page 37.

The heat pump will only operate when power is available at the water heater,
the water in the storage tank requires heating, the heat pump compressor is
cool and the ambient air temperature is within the heat pump‟s operating
temperature range of between a minimum of 3°C to 5°C and a maximum of
45°C to 55°C. If the ambient temperature is outside of this range, the water
heater will commence heating with the booster heating unit.

When the heat pump is operating, the system will switch to the booster heating
unit if the detected ambient air temperature is outside the operating
temperature range of between a minimum of 3°C to 5°C and a maximum of
45°C to 55°C.

COMMISSIONING

33

The system will not switch back to heat pump operation from the booster
heating unit if the detected ambient air temperature has moved back within the

heat pump‟s operating temperature range. The heating cycle will be completed

by the booster heating unit.
Note: The heat pump may not turn on after either having just completed a

heating cycle and more hot water is drawn from the water heater or power is
shut down to the compressor, either during or at the end of a heating cycle. The
heat pump will wait until the compressor has cooled down and the conditions
for start up are favourable in order to protect the compressor from damage.
This will be a minimum of forty five (45) minutes and may take up to
ninety (90) minutes from the last heating cycle.

It is important to wait for five (5) minutes after the heat pump has activated to
ensure it continues to operate and is functioning correctly.

Explain to the householder or a responsible officer the functions and operation
of the heat pump water heater. Upon completion of the installation and
commissioning of the water heating system, leave this guide with the
householder or a responsible officer.

TO TURN OFF THE WATER HEATER

Refer to “To Turn Off the Water Heater” on page 8.

DIAGNOSTIC FEATURES OF THE HEAT PUMP CONTROLLER

An operating mode monitor is located on the front of the heat pump module and
houses a green and a red LED.

The green LED, marked “NORMAL”, indicates the current operating mode (with
the red LED off) of the heat pump water heater and the red LED, marked
“ATTENTION”, may indicate a potential fault mode.

The green LED will emit either a
constant glow or a series of flashes,
with a 2 second interval between
each series. A series of long green
flashes may also be emitted.

The red LED will emit either a solid glow or a series of flashes, with a 2 second
interval between each series. A series of flashes indicates there may be a
particular fault condition with the system.

COMMISSIONING

34

The modes are:

Flashes

Operational Modes

solid green

(remains on)

Standby mode – water is hot

1 x green

Call for heating received – system checks performed
Note: unit may wait and continue flashing until compressor has
cooled from its last operation

2 x green

Heat pump preheating

3 x green

Heat pump operation – compressor and fan running

4 x green

Freeze protection operation – circulator on

long green

Heating unit on – ambient air temperature
below 3°C to 5°C or above 45°C to 55°C

rapid green

System start up – heating unit on

no green

(remains off)

No power at the water heater or to the heat pump
or a possible fault condition

Refer to notes overleaf before calling for service

Flashes

Indicator or Fault Modes

1 x red

Heating unit on compressor over temperature

(possible circulator fault)

3 x red

Heating unit on compressor cooling fault condition

4 x red

Heating unit on tank thermistor fault condition

5 x red

Heating unit on evaporator thermistor fault condition

6 x red

Heating unit on compressor thermistor fault condition

7 x red

Heating unit on heat exchanger water outlet sensor fault

8 x red

Heating unit on water flow fault condition

9 x red

Heating unit off refrigeration system (compressor)

fault condition

Call for service

solid red

(remains on) +

solid green

(remains on)

Heating unit off system reset – release button

COMMISSIONING

35

Notes:

There is no 2 x red flash indicator or fault mode code.
Power must be available at the water heater and to the heat pump for

the LEDs to glow or flash.

Time controlled power supply (power must be available at the water

heater)

If the water heater is connected to a time controlled power supply, then
during periods of no power supply at the water heater the LEDs will be off.

This is not a fault condition, but a result of no power being available to
energise the LEDs.

The green LED will recommence glowing or flashing when power is
available again at the water heater.

Heat pump operating range (power must be available to the heat

pump)

The heat pump‟s operating range is between an ambient air temperature
of a minimum of 3°C to 5°C and a maximum of 45°C to 55°C. The heat
pump will not operate when the ambient air temperature is outside the
heat pump‟s operating range.

If heating is required, the water heater will commence heating with the
booster heating unit in booster heating mode (long green flash) instead.
The water will be heated to 70°C during these periods.

At the completion of this heating cycle by the booster heating unit (long
green flash), the thermostat controlling the booster heating unit opens
circuit cutting power to the heat pump causing the green LED to go out.
This is not a fault condition, but a result of the power being cut to the heat
pump by the thermostat.

Refer to “Heat pump operating range” in the “Save A Service Call” section
of the Owner‟s Guide and Installation Instructions supplied with the heat
pump storage tank for further explanation.

COMMISSIONING

36

Possible fault condition

If there is power to the water heater and the green LED is off or the red
LED is flashing, this indicates there may be a fault condition with the water
heater. The red LED may emit up to nine flashes in each series of flashes.

There may be a fault condition with the water heater if either:

 there is power available at the water heater and the green LED is off,

and

 the water heater has not operated outside of the heat pump‟s

operating range.
Before phoning to arrange a service inspection due to the green LED

being off, refer to “Heat Pump Is Not Operating” in the “Save A
Service Call” section of the Owner‟s Guide and Installation
Instructions supplied with the heat pump storage tank.

or

 the red LED is flashing – the red LED may emit up to nine flashes in

each series of flashes
The fault condition which led to the red LED flashing may be cleared

after the backup heating cycle by the booster heating unit has
completed. When heating is next required the red LED will
recommence to flash the fault code for 27 seconds and then
extinguish. If the red LED then recommences to flash or
recommences to flash after the heat pump next operates, a service
call may be required.

Before phoning to arrange a service inspection due to the red LED
flashing, refer to “Heat Pump Is Not Operating” in the “Save A Service
Call” section of the Owner‟s Guide and Installation Instructions
supplied with the heat pump storage tank.

COMMISSIONING

37

SYSTEM RESET

To reset the system and override the forty five (45) minute start delay:

1. Press and hold the red controller reset button for two (2) to three (3)

seconds until both the green and red LEDs display a solid glow. Release
the button.

The reset button is located on the front left corner of the underside of the
controller box.

2. The green LED will flash rapidly for three (3) seconds, then the heat pump

will commence its heating start-up cycle. A series of 2 or 3 x green flashes
will commence.

reset

button

38

WATER SUPPLIES

This water heater must be installed in accordance with this advice to be
covered by the manufacturer’s warranty.

This water heater is manufactured to suit the water conditions of most public
reticulated water supplies. However, there are some known water chemistries
which can have detrimental effects on the water heater and its operation
and / or life expectancy. If you are unsure of your water chemistry, you may be
able to obtain information from your local water supply authority. This water
heater should only be connected to a water supply which complies with these
guidelines for the manufacturer‟s warranty to apply.

CHANGE OF WATER SUPPLY

The changing or alternating from one water supply to another can have a
detrimental effect on the operation and / or life expectation of a number of
components in this water heater.

Where there is a changeover from one water supply to another, e.g. a rainwater
tank supply, bore water supply, desalinated water supply, public reticulated
water supply or water brought in from another supply, then water chemistry
information should be sought from the supplier or it should be tested to ensure
the water supply meets the requirements given in these guidelines for the
manufacturer‟s warranty to apply.

SATURATION INDEX

The saturation index (SI) is used as a measure of the water‟s corrosive or
scaling properties.

Where the saturation index is less than –1.0, the water is very corrosive and
the manufacturer‟s warranty does not apply to the water heater. In a corrosive
water supply, the water can attack copper parts and cause them to fail.

Where the saturation index exceeds +0.40, the water is very scaling and the
manufacturer‟s warranty does not apply to the water heater.

Water which is scaling may be treated with a water softening device to reduce
the saturation index of the water.

WATER SUPPLIES

39

CHLORIDE AND PH

Where the chloride level exceeds 250 mg/L the manufacturer‟s warranty does
not apply to the water heater. In a high chloride water supply, the water can
corrode stainless steel parts and cause them to fail.

Where the pH is less than 6.0 the manufacturer‟s warranty does not apply to
the water heater. pH is a measure of whether the water is alkaline or acid. In an
acidic water supply, the water can attack stainless steel parts and cause them
to fail.

Water with a pH less than 6.0 may be treated to raise the pH. The water supply
from a rainwater tank in a metropolitan area is likely to be corrosive due to the
dissolution of atmospheric contaminants.

SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY

The water heater, including this heat pump module, is not suitable for certain
water chemistries. Those chemistries are listed below. If the water heater is
connected at any time to a water supply with the following water chemistry, the
manufacturer‟s warranty will not cover any resultant faults:

Water Chemistry

Saturation Index (SI) < -1.0

Saturation Index (SI) > +0.4

Chloride > 250 mg/L

pH < 6.0

Refer to “Water Supplies” in the Owner‟s Guide and Installation Instructions

supplied with the storage tank for the complete water supply statement.

Revision Date: 2014 July 122189B

40

WARRANTY NOTE

The heat pump water heater is covered by the manufacturer‟s warranty. For full
manufacturer‟s warranty details, refer to the Owner‟s Guide and Installation

Instructions supplied with the storage tank.

The part extracts from the “Terms Of The Warranty And The Exclusions To It”

of the water heater warranty should be noted before commencing the
installation.

TERMS OF THE WARRANTY AND EXCLUSIONS TO IT

2.5 Where the water heater is installed in a position that does not allow safe or ready access,

the cost of that access, including the cost of additional materials handling and/or safety
equipment, shall be the owner’s responsibility. In other words, the cost of dismantling or
removing cupboards, doors or walls and the cost of any special equipment to bring the
water heater to floor or ground level or to a serviceable position is not covered by this
warranty.

2.7 The warranty does not cover faults that are a result of:

c) Installation not in accordance with the Owner’s Guide and Installation Instructions or

with relevant statutory and local requirements in the State or Territory in which the
water heater is installed.

d) Connection at any time to a water supply that does not comply with the water supply

guidelines as outlined in the Owner’s Guide and Installation Instructions.

k) Ice formation in the waterways of a water heater system incorporating a freeze

protection system where the electricity supply has been switched off or has failed.

2.8 Subject to any statutory provisions to the contrary, this warranty excludes any and all

claims for damage to furniture, carpet, walls, foundations or any other consequential loss
either directly or indirectly due to leakage from the water heater, or due to leakage from
fittings and/ or pipe work of metal, plastic or other materials caused by water temperature,
workmanship or other modes of failure.