The solar storage tank is suitable for either outdoor or indoor installation. The solar storage tank should be
installed close to the most frequently used outlet and its position chosen with safety and service in mind.
Consideration must also be given to the position of the solar storage tank in relation to the solar collectors.
There are limitations on both the maximum length of the solar hot and solar cold pipes and the maximum
height between the solar storage tank and the solar collectors. Refer to “Solar Collector Location” on page 26,
to “Pipe Lengths” on page 28 and to “Maximum Height To Collectors” on page 30.
Clearance must be allowed for servicing of the solar storage tank. The solar storage tank must be accessible
without the use of a ladder or scaffold. Make sure the temperature pressure relief valve lever is accessible and
the front covers 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 anode can be inspected or replaced. Remember you may have to remove the entire solar storage
tank later for servicing.
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 when it goes through a flame, chemical
changes take place which may attack the water heater.
The solar storage tank is to be installed at ground or floor level
and must stand vertically upright on a stable base as
acceptable to local authorities. Remember all local authorities
have regulations about putting water heaters into roof spaces.
Note: It is important for the solar storage tank to be orientated
vertically upright in order for the falling film of closed circuit fluid
to operate efficiently.
The top of the solar storage tank must be a minimum of 500 mm below the bottom of the solar collectors for
the system to operate correctly.
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. AS/NZS 3500.4 also
has particular requirements when a safe tray must be installed.
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 on page 32.
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
* Expansion control valve not supplied with the water heater.
If the water heater is supplied with water from a tank supply and a pressure pump system is not installed, then
the bottom of the supply tank must be at least 1 m above the highest point of the hot water plumbing system,
including the solar storage tank. Care must be taken to avoid air locks. The cold water line to the water heater
should be adequately sized and fitted with a full flow gate valve or ball valve. Consideration must be given to
any minimum water supply pressure requirements of an in-series booster.
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