Myenergi eddi 16A1P01H, Installation Manual

Page: 29 / 36

Page 29 of 36
10.6.2 Functional Description
Some heat pump heating systems have a buffer tank for the heating circuit as well as a hot water cylinder.
eddi
can be used to make good use of any surplus generation by fully heating the water first and then heating
the buffer, allowing the maximum amount of surplus energy to be stored.
eddi
uses the Grid Sensor to monitor any surplus power that would otherwise be exported to the grid and
diverts the same amount of power to the heater loads, thereby reducing the surplus power down to zero.
For this application two heating elements are wired to the
eddi
; the water immersion heater (4) is connected
to Heater 1 output and the buffer tank immersion heater (11) is connected to Heater 2 output. Priority is given
to the water heating and only when fully heated does the
eddi
switch to heating the buffer tank.
Most heat pumps require control of the immersion heater in the hot water cylinder, this is to periodically heat
the water to a higher temperature in order to kill any Legionella bacteria that may have built up in the stored
water. Remember it is not permissible to 'back-feed' the
eddi
device; a voltage supply must not be connected
to the heater outputs. Because of this, the heat pump immersion heater relay (9) needs to be connected to the
eSense input of the Relay & Sensor Board (6) instead of the immersion heater element (4). In this application,
the
eddi
is configured to respond to the eSense signal by fully switching on Heater 1 output regardless of
available surplus.
Installation of the temperature probes (7) is optional; the heaters' mechanical thermostat can be used instead
if temperature readings are not required.
10.6.3 Settings Required
Menu Option Settings
Main
Menu
Settings… Display… Icons… Heater 1: Top Immersion
Heater 2: Bottom Immersion
Device
Settings
Advanced Relays &
Sensors
Temperatures… Set Temperatures
as required if using
temperature
probes
eSense Input… Boost… Boost 1