INSTALLATION
21
SOLAR WATER HEATER STORAGE TANK LOCATION
The solar storage tank is designed to be installed on the roof directly coupled to the solar collectors. The
solar water heater should be installed close to the most frequently used outlet and its position chosen with
safety and service in mind. The solar water heater should be installed with a north facing aspect (refer to
“Solar Collector Location”
on page 34).
The solar water heater must not be installed with an inclination of
less than 10° or greater than 45°. The water heater may not
thermosiphon or will not perform efficiently.
Clearance must be allowed for servicing of the solar storage tank.
Make sure the temperature pressure relief valve lever is accessible
and the side cover, thermostat and booster heating unit can be
removed for service. You must be able to read the information on
the rating plate.
Remember you may have to remove the entire solar storage tank
later for servicing. The solar storage tank must be capable of being
removed without structural alteration to the building or major
alteration to the piping.
For a single water heater installation, refer to the diagrams on pages 27
to
33. For multiple water heater
installations, follow the
instructions on pages
54
and
55.
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. AS/NZS 3500.4 also has particular requirements
when a safe tray must be installed.
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
(refer to diagram on
page
48
)
.
Model
180, 300
Relief valve setting
850 kPa
Expansion control valve setting *
700 kPa
Max. mains supply pressure
With expansion control valve
550 kPa
Without expansion control valve
680 kPa
* Expansion control valve supplied with the water heater
TANK WATER SUPPLY
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 water heater. 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.