In this article:
- Overview
- Wiring Diagram
- Functional Description
- Settings Required
Overview
The following wiring diagram shows a suggested application and are examples only; there are many more possibilities.
Please take a look at the Safety section within the installation manual and read all the installation sections before attempting to install the eddi.
A good level of electrical competence and a reasonable understanding of domestic plumbing systems is assumed for studying this application example.
Wiring Diagram
| Key for Wiring Diagram | |
| 1 - eddi device | 2 - Mains supply (230V AC from B16 circuit breaker or 13A fused spur) |
| 3 - Hot Water cylinder | 4 - Heating element 1 (max. 3.7kW) |
| 5 - Isolator (20A double pole) | 6 - Relay & Sensor Board (optional add-on for eddi) |
| 7 - Temperature probe (type PT1000) (optional) | 8 - De-stratification pump |
| 9 - 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) for up to five minutes. 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.
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 homeowners' 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 a water temperature reading is not required.
Settings Required