AquaMAX EM50 Series - Manual (Page 25)

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Circulated Hot Water Flow & Return Systems
For circulated hot water flow and return systems, a temperature limiting
device can only be installed on a dead leg which branches off the circulated
hot water flow and return pipe.
Warning: Installing a temperature limiting device in the circulated flow
and return pipe work, or circulating tempered water from a temperature
limiting device may cause water to be delivered to ablution areas at a
temperature exceeding the requirements of AS/NZS 3500.4.
A single or twin element electric water heater connected to an Off-Peak or
time controlled electricity supply should not normally be installed as part of
a circulated hot water flow and return system. The benefits of the Off-Peak
electricity supply will be significantly reduced and the hot water temperature
may not be maintained. If a circulated flow and return system is required, it
is necessary to install a secondary (booster) water heater which is
connected to the hot water flow and return line and supplied from the Off-
Peak electric water heater. Aquamax EM50 model water heaters are
suitable for use as the secondary water heater provided it has been
determined that hot water demand can be met (the secondary water heater
has been suitably sized) and the EM50 thermostat has been set to 70°C to
meet the requirements of AS 3498.
Note: The EM50 thermostat factory
setting is 70°C to deliver 60°C.
For Continuous and Off-Peak circulated hot water flow and return plumbing
arrangements, refer to the “Circulated Flow & Return Plumbing Diagrams”
on page 25.
Circulated Flow & Return Plumbing Diagrams