Myenergi eddi, Руководство по эксплуатации и установке, Страница: 57 / 64

Application Examples
Key for Wiring Diagram 13
eddi
device
Mains supply (230V AC from B16 circuit breaker or
13A fused spur)
Hot water cylinder
Heating element (max. 3.7kW)
Isolator (20A double pole)
Relay & Sensor Board (optional add-on for
eddi
)
Temperature probe (type PT1000) (optional)
Heat pump (with immersion heater output)
Heat pump immersion heater relay
Heat pump hot water timer
Functional Description
In this application the water is heated by eddi with the immersion heater when there is a relativity small amount of surplus
power (e.g. < 1kW). But when there is enough surplus the heat pump is used to heat the water instead. This configuration
takes advantage of the higher efficiency of the heat pump compared with the immersion heater, whilst ensuring none of
surplus power is wasted.
For this application the water heating element (4) is wired to the
eddi Heater 1 output. The water heating timer control
(10) for the heat pump (8) is connected to the Relay 1 normally open contacts of the Rely & Sensor Board (6).
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 probe (7) is optional; the heaters' mechanical thermostat can be used instead if temperature
reading is not required.
Settings Required
Menu Option Settings
Main Menu Settings… Display… Icons… Heater 1:
Top Immersion
Heater 2: None
Priority… Heater 1
Advanced Menu… Relays &
Sensors…
Temperatures… PT1 Set Point: If PT1 temperature
probe is used, set
temperatures as
desired for water
heating e.g. 60°C
Relay 1… Export… On Threshold: Should be set to power
level required for
efficient heap pump
operation e.g. 1kW
Off Threshold: 50% of On Threshold
e.g. 500W
Inc Diverted: YES
Min On Time: Set this reduce cycling
of heat pump e.g. 15m
Min Off Time: Set this reduce cycling
of heat pump e.g. 5m
eSense Input… Boost… Heater 1
operation and installation manual eddi 57
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