Rheem Loline 271, Руководство пользователя и инструкции по установке, Страница: 27 / 52

INSTALLATION – SOLAR STORAGE TANK
27
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
The solar storage tank of a solar water heater should not be installed as part of a circulated hot water flow and
return system in a building. The benefits of solar gain will be significantly reduced.
In-tank electric boosting
If this solar water heater has its electric heating unit connected for in-tank boosting and a circulated flow and
return system is required, it is necessary to install a secondary water heater in the circulated flow and return
system and supplied from the solar water heater. The flow and return lines connect to the secondary water
heater, not the solar storage tank. The secondary water heater makes up for the pipe heat loss in the flow and
return system and must be able to provide a hot water outlet temperature of at least 60°C.
Note: The thermostat or preset outlet temperature of the secondary water heater must always be set to at
least 60°C.
Refer to the diagram
Circulated Hot Water Flow and Return System
– Solar Water Heater with In-tank Boosting
on page 27.
Circulated Hot Water Flow and Return System
– Solar Water Heater with In-tank Boosting
In-series boosting
If this solar water heater does not have its electric heating unit connected for in-tank boosting and is installed
as a solar pre-heater to an in-series booster water heater and a circulated flow and return system is required,
it is necessary to connect the circulation return line to the in-series booster and not to the solar storage tank.
Notes:

Water must not be circulated from an in-series booster water heater with a thermostat or temperature
setting of less than 60°C. This setting should be increased if the water temperature decreases by more
than 5°C through a circulated hot water flow and return system due to heat loss in the ring main.

AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. To meet this requirement of AS 3498:

an in-series storage water heater must always have its thermostat set to at least 60°C

an in-series continuous flow water heater must always have its preset outlet temperature setting set
to at least 70°C

If the in-series water heater is a continuous flow water heater, the circulator must be:

sized and set to provide a minimum flow rate of 3.0 L/min through the circulated hot water flow and
return system, and

either thermostatically and / or timer controlled.
The circulator must not be set to operate continuously, i.e. 24 hours per day.
Refer to the diagram
Circulated Hot Water Flow and Return System
– Solar Water Heater with In-series
Boosting on page 28.
LEGEND