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WATER SUPPLY
The maximum water pressure is listed on page 11. An approved pressure limiting valve may be required if the
maximum rated water supply pressure is exceeded.
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.
A water filter MUST BE fitted on the inlet to the tank to prevent sludge or foreign matter entering the system.
In a scaling water supply, calcium carbonate and possibly other compounds are deposited out of the water onto
any hot metallic surface and form a scale.
Scaling water may cause scale deposits to form onto the metallic surfaces of the PTR valve and may prevent it
from operating properly. To prevent this, an expansion control valve (ECV) must be fitted on the cold water line
after the non-return valve in areas of scaling water. ECVs' must be fitted in South Australia and Western Australia
to comply with local regulations.
STORAGE TEMPERATURE
To meet regulatory requirements the thermostat control on the heat pump water heater is factory preset to heat all
the water in the tank to 60°C once a week. This cannot be altered.
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.
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 is supplied with the heat pump.
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 in all installations.
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. This pipework must
be insulated as specified in AS/NZS3500.4
•
An approved pressure limiting valve (supplied with some systems) is required if the maximum rated water
supply pressure on page 11 is exceeded.
•
Tempering valve(s) or thermostatic mixing valve
Rinnai
15
INSTALLATION
EHPA Heat Pump OIM
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