Rheem MPs Series User manual

This water heater must be installed and serviced by an authorised person.
Please leave this guide with the householder.
Installation Instructions
Air Sourced Split
Heat Pump Module
MPs 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.
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.

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.........................................................11
Connections –Electrical .....................................................................30
Commissioning....................................................................................32
Water Supplies.....................................................................................36
Warranty Note ......................................................................................39

4
INSTALLATION
THE HEAT PUMP MODULE OF THIS WATER HEATER IS FOR OUTDOOR
INSTALLATON ONLY.
The installation must comply with the requirements of AS/NZS 3500.4,
AS/NZS 3000 and all local codes and regulatory authority requirements. In New
Zealand, the installation must conform with Clause G12 of the New Zealand
Building Code.
This water heater is recommended for connection to a 24 hour per day power
supply.
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.
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. The water heater must not be operated until both
components are installed, connected and purged of air. Refer to “Heat Pump
and Tank Assembly” on page 11.
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.
Care must be taken during transportation and handling. Do not lay the
heat pump module down and do not tilt the heat pump module more than
30° from the vertical. This will displace the compressor lubricating oil. If the
heat pump module 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.
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.

INSTALLATION
5
HEAT PUMP MODULE LOCATION
The heat pump module is suitable for outdoor installation only. The heat pump
module‟s position is to be chosen with noise, safety and service in mind. Make
sure people (particularly children) will not accidentally touch the air inlet louvres
and outlet grille and that they are clear of obstructions and shrubbery.
It is advisable to install the heat pump module away from bedroom or living
room windows as the system components can generate a level of noise whilst
they are operating. Consider the location in relation to neighbours‟ bedrooms
and living room windows.
Clearance must be allowed for servicing of the heat pump module. It must be
accessible without the use of a ladder or scaffold. Make sure the heat pump
module‟s top and front covers and system controls can be removed for service.
You must be able to read the information on the rating plate of the heat pump
module. Remember you may have to remove the heat pump module later for
servicing.
It is recommended the heat pump module be installed at ground or floor level
and must stand vertically upright.
The heat pump module must be installed against a wall and on a level slab or
solid base with a minimum size of 600 mm wide x 600 mm deep. The heat
pump module must be secured using the wall bracket and four feet brackets
provided. Refer to “Heat Pump and Tank Installation” on page 11.
A clearance of at least 300 mm is required perpendicular from both the side air
inlet louvres and the outlet grille to any wall or obstruction. Refer to the
dimensions diagram on page 9.
The heat pump storage tank and heat pump module must be installed within
four (4) metres of each other. The heat pump flow and return pipes connecting
the heat pump storage tank to the heat pump module must not exceed
four (4) metres in length each and must not contain more than 4 x 90º bends
each. All changes in direction of the pipe work must be made using bends. The
pipe work should not contain elbows.
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.

INSTALLATION
6
Note
These instructions cover only the installation of the heat pump module 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
the dimensions of the heat pump water heater and any clearances
required from surrounding objects
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.
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 4°C and the heat pump module is not
operating, the system will operate the circulator periodically. During this freeze
protection cycle, the circulator will operate for three (3) minutes 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.
Warning: In areas where the ambient air temperature may fall below 0°C,
power must be available to the water heater at all times to prevent freezing in
the heat pump circuit.
The system must be installed with the heat pump circuit hot and cold pipes fully
insulated with closed cell polymer insulation with a minimum thickness of
13 mm. Thicker insulation may be required to comply with the requirements of
AS/NZS 3500.4. The water heater has NO WARRANTY for freeze damage if
the heat pump circuit hot and cold pipes are not suitably insulated or if power is
unavailable at the water heater.

INSTALLATION
7
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
270, 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.
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.
PURGING AIR FROM THE SYSTEM
The water heater system must be purged of air prior to operation, using the
manual air bleed valve supplied on the storage tank. Failure to bleed the air out
of the connecting pipe work and heat pump module will result in non-operation
of the circulator and failure of the heat pump to operate due to overheating.

INSTALLATION
8
CONDENSATE DRAIN
A drain line must 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 an
authorised or 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 your nearest Rheem Service
Department or Accredited Service Agent to arrange for an inspection.

INSTALLATION
9
DIMENSIONS AND TECHNICAL DATA
HEAT PUMP DIMENSIONS - REMOTE
325 LITRE STORAGE TANK
HEAT PUMP DIMENSIONS - REMOTE
325 LITRE STORAGE TANK
elevation plan view
Heat pump module models
180536 (R)
180540 (E)
Maximum rated power input
watts
3600
Rated heat pump power input
watts
800
Booster element ratings
kW
2.4, 3.6
Refrigerant type
R134a
Refrigerant circuit pressure
kPa
3000
Mass heat pump module
kg
46
Storage tank capacity
litres
270
325
410
Boost capacity*
litres
180
180
200
Mass tank empty
kg
71
88
112
Mass tank full
kg
341
413
522
* The boost capacity of a low watts density or other than a 2.4 kW or 3.6 kW heating unit,
if used, is 100 litres (270 and 325 litre storage tanks) or 125 litres (410 litre storage tank).
Technical data is subject to change.

INSTALLATION
10
TYPICAL INSTALLATON –OUTDOOR LOCATION
TYPICAL INSTALLATION
HEAT PUMP WATER HEATER - REMOTE

11
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. The water heater must not be operated until both
components are installed, connected and purged of air.
Note: The heat pump flow and return pipes connecting the heat pump storage
tank to the heat pump module must not exceed four (4) metres in length each
and must not contain more than 4 x 90º bends each. All changes in direction of
the pipe work must be made using bends. The pipe work should not contain
elbows.
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 must be installed
against a wall and on a level slab or solid base with a minimum size of 600 mm
wide x 600 mm deep. The heat pump module must be secured using the wall
bracket and four feet brackets provided.
CAUTION: The heat pump module weighs approximately 46 kg. Use the hand
holes provided in the sides of the packaging. Good lifting practice should be
followed.
There are two flexible braided hoses provided inside the heat pump module.
The flexible braided hoses are removed from the module and fixed to the
outside of the heat pump module jacket using the brackets provided during the
assembly procedure. The flow and return pipe work from the heat pump
storage tank connects to these hoses.
A cable set housed in conduit is provided inside the heat pump module. The
cable set is removed from the module and fixed to the outside of the heat pump
jacket using the brackets provided during the assembly procedure. The cable
set connects to the heat pump storage tank.
STORAGE TANK
The storage tank must be fully supported by a level slab or solid base. There
are two water fittings located on the side of the storage tank to which the flow
and return pipe work from the heat pump module is connected during the
assembly procedure. The cable set from the heat pump module is also
connected to the storage tank during the assembly procedure.

HEAT PUMP AND TANK ASSEMBLY
12
storage tank heat pump module
KIT
There is a kit supplied with the heat pump module (PN 290123). The
components supplied in the kit are:
290123
Kit Installation Heat Pump Module Split
Qty
126574
Installation instructions heat pump module split
1
126571
Easy start guide instructions heat pump module split
1
220522
Drain hose tube ½” ID x 380 long
1
080189
Hose spring clamp –½” ID
1
052165
Saddle clamp
1
080021
Screw phillips pan head No. 8 x 13 zinc plated black
2
108392
Bracket hose mount
1
108393
Bracket hose clamp
1
080059
Nut speed fasteners No. 6 1219
4
052160
Conduit clamp
1
080031
Screw phillips pan head No 8 x 13
7
-
Dynabolt Z passivated anchor 8 mm x 40 mm (M6)
4
108399
Bracket wall
1
-
Wall plug 8 mm x 25 mm
1
080117
Screw button head 8G x 15 x 25 zinc plated
1
088189
Tube bush fitting connector ½” M x ½” OD reliance W120
2
-
Cable tie black UV rated nylon 200 x 4.8 mm
4

HEAT PUMP AND TANK ASSEMBLY
13
ASSEMBLY PROCEDURE
Warning: The heat pump must be assembled, plumbed, filled with water
and purged of air prior to power being connected and switched on.
The following procedure is to be followed to install the heat pump module in
position and connect to the heat pump storage tank.
1. Heat Pump Storage Tank: Remove all packaging including the carton
base from the storage tank and position in its intended location, supported
by a level slab or solid base.
The cold and hot water connections may be on either the left or right hand
side, and should be parallel to the wall.
The heat pump flow and return connections are on the opposite side of the
heat pump storage tank to the cold and hot water connections. The heat
pump storage tank should be orientated so these connections face the
location of the heat pump module. This will allow for an easier and neater
installation of the heat pump flow and return pipe work.
2. Heat Pump Module: Remove all packaging including the carton base
from the heat pump module.
Set aside the carton liner piece marked “(DO NOT REMOVE)”as this
contains the template which is required to locate the position of the
holes to be drilled to connect the heat pump module bracket to the
wall and the heat pump feet to the supporting base.
Remove the heat pump module‟s rear access panel from the carton
liner and set aside.
3. Kit Bag and Cable Set: Through the opening at the rear of the heat pump
module:
Remove the kit bag and set aside
Withdraw the cable set and the two flexible braided hoses.

HEAT PUMP AND TANK ASSEMBLY
14
4. Drain Hose: Retrieve the drain hose, hose clamp, saddle and two black
screws from the kit bag.
Feed the hose through the penetration on the side of the heat pump
module
Slip the hose clamp over the upper end of the hose within the heat
pump module
Push the hose over the spigot on the condensate tray located below
the evaporator
Secure the hose to the spigot with the hose clamp
Extend the hose away from the base of the heat pump module using
standard 12 mm irrigation fittings
Secure the hose to the side of the heat pump module with the saddle,
using the two black screws.
Step 4
feed hose through secure hose secure hose
penetration to the spigot with saddle

HEAT PUMP AND TANK ASSEMBLY
15
5. Heat Pump Module Location: Select the location for the heat pump
module.
The heat pump module must be positioned such that there is a clearance
of at least 300 mm perpendicular from the air inlet louvres and the outlet
grilles.
The heat pump module must be installed against a wall and on a level slab
or solid base with a minimum size of 600 mm wide x 600 mm deep.
The heat pump flow and return lines connecting the heat pump storage
tank to the heat pump module must not exceed four (4) metres in length
each and must not contain more than 4 x 90º bends each. All changes in
direction of the pipe work must be made using bends. The pipe work
should not contain elbows.
Ensure the cable set reaches the storage tank with sufficient length to
enable it to be saddle clamped to the wall.
Ensure the maximum length of the heat pump flow and return pipe
work and the maximum number of 90° bends will not be exceeded.
HEAT PUMP DIMENSIONS - REMOTE
325 LITRE STORAGE TANK
Step 5
select location for heat pump module
and allow for at least 300 mm ventilation clearance

HEAT PUMP AND TANK ASSEMBLY
16
6. Connection Side for Heat Pump Module: Select which side, either the
left or right hand side, of the heat pump module will be used to connect the
heat pump flow and return lines to the flexible braided hoses.
It is recommended to select the side of the heat pump module which is
closest to the heat pump storage tank. This will allow for an easier and
neater installation of the heat pump flow and return pipe work.
The cable set should also be run from this side of the heat pump module
to the heat pump storage tank.
7. Hose Tabs: Remove the two (2) tabs on the selected side of the heat
pump module to accommodate the flexible braided hoses.
Pliers or tin snips may be required to remove the tabs.
Step 7
remove the two hose tabs
8. Hose Bracket Assembly: Retrieve the hose mount angle and hose clamp
brackets from the kit bag.
The hose mount angle bracket, when secured to the heat pump module, is
to be angled away from the wall, with the „hot‟ flexible braided hose in the
top slot of the bracket.
Locate the black heat shrink area of the „hot‟ flexible braided hose,
marked with a red collar, into the top slot in the angle hose bracket.
Locate the black heat shrink area of the „cold‟ flexible braided hose,
marked with a blue collar, into the bottom slot in the angle hose
bracket.
Fix the hose clamp bracket to the angle hose bracket, using a screw
provided, to secure the flexible braided hoses in place.

HEAT PUMP AND TANK ASSEMBLY
17
Step 8
assemble hose mount angle and hose clamp brackets
9. Speed Fasteners: Retrieve the four (4) sheet metal speed fasteners from
the kit bag.
Clip one speed fastener over each of the four (4) holes, two (2) on
either side of the rear access opening, in the heat pump module
casing.
Step 9
clip speed fasteners to the heat pump module casing

HEAT PUMP AND TANK ASSEMBLY
18
10. Rear Access Panel: Retrieve the heat pump module‟s rear access panel.
Loosely position the two flexible braided hoses attached to the hose
bracket assembly in the two tab cut outs.
The „hot‟ flexible braided hose, marked with a red collar, should be in
the top tab cut out.
Position the rear access panel over the opening in the rear of the heat
pump module, with the panel located between the hose clamp
assembly and heat pump module.
Locate the holes in the rear access panel over the holes and
speed fasteners on the heat pump module and fix in position on
the side opposite to the selected location of the flexible braided
hoses, using two of the screws provided.
Position the hose bracket assembly, locating over the two holes in the
rear access panel and the two holes and speed fasteners on the heat
pump module and fix in position, using two of the screws provided.
Step 10
fix rear access panel and hose bracket assembly
to heat pump module

HEAT PUMP AND TANK ASSEMBLY
19
11. Conduit Clamp: Retrieve the conduit clamp from the kit bag and fix it to
the pilot hole above the rear access panel on the side which will be closest
to the heat pump storage tank, using a screw provided.
Locate the cable set conduit in the conduit clamp and close the
clamp.
Step 11
fix conduit clamp to heat pump module and locate cable set conduit
12. Slab or Solid Base: Position the slab or solid base to support the heat
pump module.
Note: The rear edge of the slab or solid base should be placed hard
against or as close as practicable to the wall to enable sufficient area for
the location of the rear dynabolt holes.
Ensure the base or solid base is level.

HEAT PUMP AND TANK ASSEMBLY
20
13. Template: Retrieve the heat pump module‟s carton liner piece, marked
“(DO NOT REMOVE)”, from the original packaging.
Position the heat pump module template, in an L shape, against the
wall and slab or solid base.
Mark the location on the slab or solid base, through the template, of
the four (4) holes to be drilled for the dynabolts to secure the heat
pump module to the slab or solid base.
Mark the location on the wall, through the template, of the hole to be
drilled for the heat pump module wall bracket.
Remove the template.
MARK LOCATION ON
WALL TO DRILL HOLE
FOR THE WALL
BRACKET.
MARK LOCATION ON
SLAB OR SOLID BASE
TO DRILL HOLES
FOR THE DYNABOLTS
POSITION THE
CARTON LINER
ON THE SLAB
OR SOLID BASE
AND AGAINST
THE WALL
CARTON LINER TEMPLATE LOCATION
REMOTE HEAT PUMP MODULE
Step 13
position template on the slab or solid base and against the wall