Application Examples
Key for Wiring Diagram 8
eddi
device
Mains supply (230V AC from B16 circuit breaker or
13A fused spur)
Hot water cylinder
Water heating element (max. 3.7kW)
Isolator (20A double pole)
Relay & Sensor Board (optional add-on for
eddi
)
Temperature probe (type PT1000) (optional)
De-stratification pump
Switched fused spur for pump (5A)
Functional Description
Hot water cylinders that are normally heated by a gas or oil boiler often have an immersion heater installed in the top half
of the cylinder. This means only about half of the water can be heated with electric. With the addition of a de-stratification
pump, almost the entire volume of the hot water cylinder can be fully heated.
The water in the cylinder (3) is heated via the immersion heater (4) with surplus power until the thermostat has opened,
then
eddi
will run the pump (8). This pushes some of the hot water from the top of the cylinder (3), down to the bottom,
thus pulling the cooler water up to the region that can be heated via the immersion heater (4). As the cooler water is drawn
up, the thermostat will close again and
eddi
is able to resume heating the water.
When the immersion heater thermostat closes, the pump will run until the thermostat closes again or until 5 minutes has
passed (whichever is sooner).
An auxiliary heat source (e.g. a gas boiler) is set to heat the water either early in the morning or later in the evening,
depending on the home owners' lifestyle. Heating the water during times of generation (e.g. daylight hours) is best avoided
to allow maximum capacity for the surplus energy.
Installation of the temperature probes (7) is optional; the immersion heaters' mechanical thermostat is used by
eddi
if
water temperature reading is not required.
Settings Required
Menu Option
Settings
Main Menu
Settings…
Display…
Icons…
Heater 1:
Top Immersion
Heater 2:
None
Advanced Menu…
Relays &
Sensors…
Relay 1…
Heating…
Destrat 1
operation and installation manual
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