Rinnai SPLIT SOLAR Operation & Installation Manual page 64

INSTALLATION & MAINTENANCE - ELECTRIC BOOSTED
12.Connections for single element heaters
shows the wiring detail for single and twin element heaters.
Figures 46 & 47
Figure 46
- Wiring detail - single element heaters
A flexible 20 mm conduit is required for the electrical cable to the storage cylinder. The conduit is to be
connected to the unit with a 20mm terminator. Connect the power supply wires directly to the terminal
block and earth tab connections ensuring there are no excess wire loops inside the front cover.
Connections for twin element heaters
Figure 47 - shows the wiring detail for twin element heaters wired for non simultaneous operation.
A flexible 20 mm conduit is required for the electrical cable to the storage cylinder. All wiring passes
through the lower entry. The conduit is to be connected to the unit with a 20 mm terminator. A common
neutral is used. Connect the power supply wires directly to the terminal block and earth tab connections
ensuring there are no excess wire loops inside the front cover.
Heating Element Thermostat Temperature Settings
Australian Standards require a minimum thermostat set point of 60°C to inhibit the growth of Legionella
Pneumophilia bacteria. These standards also require that the thermostat set point of water heaters fitted
with an upper (or booster) element is at least 10°C below the thermostat set point of the lower element.
In the interests of durability, the thermostat set point for storage cylinders should not exceed 70°C.
Hence, in systems with a single heating element only the thermostat set point should be at least 60°C
and no greater than 70°C. In systems with both a lower and upper (or booster) element, the thermostat
set point of the lower element should be between 60°C and 70°C and the upper element 50°C - 60°C.
Rinnai Australia
Figure 47
- Wiring detail for twin element
- 62 - Solar Split Systems Operating / Installation Manual Version 9 - 21/11/12
heaters