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