4
Important Installation Information
Envirosun AS Installation Manual Rev1a PVNW.docx
Page 12
4.8
Legionella requirements
The Australian Standards require that a water heater system provide a means to inhibit
the growth of the Legionella bacteria in potable water.
If the system is installed with an approved Gas AES, with the outlet temperature set to
70°C, then this requirement is satisfied.
If the system is installed with an Electric AES, then one of the following requirements
must be met:
1.
At least 45% of the storage volume is heated to 60°C daily. This can be achieved
by leaving the AES permanently on.
2.
At least 90% of the storage volume is heated to 60°C for 32 minutes in each 7
day period. This will require any timing device or manual control to be
adequately set-up or operated.
4.9
Roof location selection
There are six major factors to consider when selecting the solar collector installation
location:
4.9.1
Collector orientation
For optimum performance, the solar collectors need to face the equator (in southern
hemisphere this is north and in the northern hemisphere this is south). Installations
orientated at angles of up to 45° away from the equator do not have a major effect on the
annual solar output. Consequently, roof locations which face less than 45° away from the
equator are acceptable. If the collectors are installed with an east facing bias the best
solar input is achieved in the morning and if there is a west facing bias the best solar
input is in the afternoon.
Figure 4.9.1 Collector orientation
