Myenergi eddi 16A1P01H, Installation Manual

Page: 21 / 36

Page 21 of 36
10.2.2 Functional Description
It is common for electric only households to employ dual tariff billing. This application enables automatic
heating of water when the economy tariff is available whilst also using any surplus generated power to heat
the water. The economy rate electricity can be time based or random, in either case,
eddi
can be set to heat
the water at the economy rate whenever possible, or at the economy rate only during certain times.
Heater 1 (the top immersion heater) (4) is heated with surplus power until the water at the top of the cylinder
is hot and the thermostat opens. Then
eddi
will immediately switch over to Heater 2 (6); heating the bottom
of the cylinder. This makes the most of surplus energy as sometimes there will not be enough to heat the whole
volume of the cylinder; it's best to heat a smaller proportion (i.e. the top) first so there is some usable hot water,
rather than a larger volume of warm water.
During heating of Heater 2,
eddi
will switch back to Heater 1 every 15 minutes to check if it can store any more
heat. When the water is fully heated, any surplus power will be exported,
eddi
will switch back to the priority
heater and check the lower priority heater every 15 minutes depending on your check period setting. The
heating priority can be changed in the Main Menu >Heater Settings > Priority
If eSense Input is set to Boost Enable 1 & 2, the BOOST TIMER screen for either heater will include an option
to enable the boost timer only when the eSense input is live. In the BOOST TIMER, the e can be toggled on/off,
if e is present, the boost will activate only when the boost times are valid and the economy rate tariff is
available. Alternatively the eSense input can be used to activate the boost whenever the economy tariff rate
electricity is available, regardless of boost times. To do this, eSense input should be set to Boost 1&2. When
using this option, the Boost Timer is not needed.
If automatic sensing of economy rate times is not needed, the Boost Timer can be simply set to coincide with
the economy tariff times. In this case the Relay & Sensor Board (6) and the eSense wiring (8) are not required.
Installation of the temperature probes (7) is optional; the heaters' mechanical thermostat is used by
eddi
if
temperature readings are not required. The
eddi
device should be labelled with a “dual supply” warning.
10.2.3 Settings Required
Menu Option Settings
Main
Menu
Settings… Display… Icons… Heater 1: Top
Immersion
Heater 2: Bottom
Immersion
Priority… Heater 1
Device
Settings
Advanced Relays &
Sensors
Temperatures… Set
Temperatures
as required if
using
temperature
probes
eSense Input… Boost… Boost Enable
1&2/Boost
1&2