Rinnai
9
DD FP Solar Pre Heat System OIM
With the exception of solar collector flow and return pipes, water pipe sizing should be performed in accordance
with AS/NZS 3500.
The maximum water pressures for the various systems are listed on page 22. Approved pressure limiting valves
may be required if the maximum rated water supply pressures are exceeded. For gas boosted systems to achieve
the rated flow through the outlet of the continuous flow water heater, the minimum water supply pressures must be
supplied. The systems will operate at lower pressures but the rated flow will not be achieved.
Water chemistry and impurity limits are detailed in the separate Warranty document. Most metropolitan water
supplies fall within these requirements. If you are unsure about water quality, contact your water authority. If sludge
or foreign matter is present in the water supply, a suitable filter should be incorporated in the water supply to the
storage cylinder.
HOT WATER DELIVERY TEMPERATURE
Local regulations and/or the requirements of AS/NZS 3500.4 must be considered regarding the temperature
limitations of hot water supplied to areas used primarily for personal hygiene. The temperature of water to these
areas is limited to 45°C for early childhood centres, primary and secondary schools and nursing homes or similar
facilities for young, aged, sick or people with disabilities and 50°C for all other buildings. To comply with these
requirements, a temperature limiting device, such as a thermostatic mixing or tempering valve, will be required on
all solar hot water systems as detailed below.
NOTE
It is the responsibility of the installer to comply with all local regulations. Hot Water delivery
temperature requirements may differ from those stated above
STORAGE CYLINDER LOCATION
The solar storage cylinders have an ingress protection rating of IPX4 making them suitable for internal or external
installation. Rinnai ‘external’ gas boosters are suitable for external installation only.
Storage cylinders must be installed in freestanding mode on a level and stable base. For external installations,
storage cylinders should be mounted on a concrete base at least 50mm thick or on well seasoned, evenly spread
hardwood slats with a thickness of at least 25mm. Where property damage can occur, storage cylinders should be
installed with an approved safe tray (overflow tray).
Ensure the cylinder does not stand on wet surfaces.
VALVES AND FITTINGS
The following valves and fittings are supplied with your solar hot water system:
•
A combined pressure and temperature (PTR) relief valve, capacity 10 kW. Relief valve pressure settings
vary with models. This valve is fitted at the top of the storage cylinder. The PTR valve is a safety device and
it is mandatory that it is fitted by the installer on all installations.
•
Fittings as shown in the tables on pages 14 and 25.
The following valves & fittings are to be supplied by the installer:
•
A cold water expansion control valve (ECV). An ECV must be fitted in Western Australia and South Australia
to the cold water supply to the storage cylinder to comply with local regulations. An ECV is recommended in
all other geographical areas where the water supply has a tendency to cause scaling. This will reduce hot
water discharge from the Pressure and Temperature Relief (PTR) valve which minimises wear on this valve.
•
A stop cock, non return valve and line strainer. Combination valves incorporating two or more of these
functions (such as ‘Trio’ valves) are suitable. These are fitted to the cold water supply to the storage cylinder
by the installer.
•
Cold water supply and hot water discharge pipework to and from the storage cylinder.
•
Solar collector flow and return pipes and storage cylinder connections.
•
An isolating valve and connection union for the gas supply to the gas booster.
•
An approved pressure limiting valve is required if the maximum rated water supply pressure in the table on
page 9 is exceeded.
INSTALLATION
