Rheem MPi 551 Series Owner's Manual And Installation Instructions page 20

INSTALLATION
WATER HEATER LOCATION
The water heater is suitable for outdoor installation only. The water heater should be installed close to the
most frequently used outlet and its position 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 water heater away from bedroom
or living room windows as the system controls 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 water heater.
The water heater must be accessible without the use of a
ladder or scaffold. Make sure the temperature pressure relief
valve lever is accessible and the top and front covers, system
controls and thermostat can be removed for service.
You must be able to read the information on the rating plate.
If possible leave headroom of one water heater height so the
anodes can be inspected or replaced. Remember you may
have to remove the entire water heater later for servicing.
It is recommended the heat pump water heater be installed at ground or floor level and must stand vertically
upright. The base of the water heater is made of corrosion resistant material, and it may be placed directly in
contact with the supporting surface. It is not necessary to allow for free air circulation under the base of the
water heater.
Note: The water heater should not be placed in direct contact with a concrete surface that is less than two
months old and not fully cured as this may attack the metal coating of the water heater base. A moisture
barrier should be used between the two surfaces in this instance.
The water heater must be installed with a clearance of at least 100 mm from a wall. A clearance of at least
300 mm is required perpendicular from both the front air inlet louvres and the outlet grille to any wall or
obstruction. Refer to the
The heat pump storage tank and module must be installed on a level slab or solid base of a minimum
900 mm wide x 650 mm deep. The heat pump module must be fully supported by the level slab or solid
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.
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.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below, an approved pressure
limiting valve is required and should be fitted as shown in the installation diagram
page 36).
Model
Relief valve setting
Expansion control valve setting *
Max. mains supply pressure
With expansion control valve
Without expansion control valve
Min. mains supply pressure
* Expansion control valve not supplied with the water heater.
dimensions diagram on page 24.
325, 410
1000 kPa
850 kPa
680 kPa
800 kPa
200 kPa
20
(refer to diagram on