Rheem MPi Series User 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
K275
100
WALL
AIR
INLET
AIR INLET
C
AIR
OUTLET
300 MIN
VENTILATION
CLEARANCE
CONDENSATE DRAIN
TPR
VALVE
AIR INLET
AIR
OUTLET
300 MIN
F
HEAT PUMP DIMENSIONS
325 & 410 INTEGRATED
SK6753 - 1 A4
REV CD 04/13
AD
Rheemglas 551 Series

INSTALLATION
10
AD
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
HEAT PUMP DIMENSIONS
325 & 410 INTEGRATED
SK6898-3 A4
REVCD 04/13
VENTILATION
CLEARANCE
300 MIN
VENTILATION
CLEARANCE
HOT
OUTLET
COLD
INLET
ELECTRICAL
CONNECTION
L
F
275
B
M
RheemPlus 554 Series