Screen View- Icons; Principle Of Operation - Tech Controllers EU-427i User Manual

S
CREEN VIEW
gap between icons indicating pump and room controller status
pump operating in "sensor failure" mode
circulation pump
pump operating in "temperature mode"; turn-off threshold was reached
same as above but the turn-off threshold was not reached
pump operating in "temperature alarm mode"; alarm threshold was exceeded on one of the sensors
room controller open (too low temperature in the room)/pump operating in room mode
room controller closed (sufficient temperature in the room)/pump operating in room mode
pump operating in "anti-freezing mode"
pump operating in "anti-stop mode"
digit 1, 2 or 3 at the end of the pump operation symbol indicates the pump priority (only for "temperature" type)
P
RINCIPLE OF OPERATION
The intended use of EU-427i controller is to control the operation of max. 3 pumps at a time. The user can
select one of the three pumps: central heating pump, domestic hot water pump or circulation pump. The
controller turns the selected pump on or off depending on if the specific criteria are met.
The user can introduce changes in parameters using the pulser knob. The required function can be selected
or the function value can be changed by turning the knob. By pressing the knob the function can be entered
or the value can be changed. To exit any of the functions press the exit button.
The top line of the main screen indicates statuses of the pumps and the room controller while the bottom
line shows the current temperatures on the individual sensors (unless they are off or damaged).
The controller is equipped with a system preventing extended periods of inactivity of pumps, a so-called anti-
stop system. If the pump is not operating for a longer time period (e.g. in summer time) the pump is turned
on for 1 minute at intervals equal to the number of days defined by the user. Additionally, the time is stored
in a non-volatile memory to ensure that the time measurement is continued after any possible interruption
in power supply.
The controller is also equipped with anti-freeze protection function to prevent water freezing in the circuit. If
the pump sensor temperature drops below the value defined by the user (e.g. 7°C) the pump will turn on and
operate until the sensor temperature is 2°C higher than the one defined by the user (which is 9°C in our
example).
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ICONS
current temperature cannot be displayed (sensor error)