Rheem 596160 Owner's Manual And Installation Instructions page 31

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.
If 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.
A Rheem 874820 model in-series gas booster can be installed as part of a circulated hot water flow and return
system in a building. The connecting pipe work supplied with the water heater will need to be modified in order
to install a suitable Tee prior to the water inlet of the in-series gas booster. The circulated return line is to be
connected to the Tee.
Refer to the diagram Circulated Hot Water Flow and Return System
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.
Temperature Settings
•
AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water.
•
The in-series gas booster can satisfy this AS 3498 requirement provided it is energised and the booster
preset outlet temperature setting is 70°C or higher.
•
Water should not be circulated from a water heater with a temperature setting of less than 60°C.
•
The return water temperature to the water heater must not be less than 55°C.
If the water temperature decreases by more than 5°C due to heat loss from the ring main, the preset outlet
temperature setting or thermostat setting of the in-series water heater must be set to above 60°C to ensure
the return water temperature is not less than 55°C.
LEGEND
Circulated Hot Water Flow and Return System
In-series Gas Booster Integrated with Storage Tank
INSTALLATION – SOLAR STORAGE TANK
on page 31.
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