Immergas MAGIS COMBO 4 V2 Instructions And Recommendations page 83

3.22 SCREED HEATER FUNCTION
The indoor unit is equipped with a function to perform the ther-
mal shock on new radiant panel systems, as required by the appli-
cable standard.
Contact the manufacturer of the radiant panels for the
thermal shock characteristics and its correct execution.
To be able to activate the function there must be no re-
mote control connected, while in case of system divided
into zones it must be properly connected, both hydrauli-
cally and electrically.
The active zone pumps are those with ongoing requests, made via
the room thermostat input.
The function is activated from indoor unit in stand-by by pressing
and holding the buttons "Reset" and "Mode" for more than 5 se-
conds (Fig. 62).
The standard function lasts in total 7 days - 3 days at the lowest
temperature set and 4 days at the highest temperature set (Fig. 8).
Duration can be changed by changing the value of parameters "T
22" and "T24".
After activating the function, the lower set (range 20 ÷ 45 °C de-
fault = 25 °C) and the higher set (range 25 ÷ 55 °C default = 45 °C)
appear in sequence.
The temperature is selected by means of the buttons "+" and "-" of
the system side ( ) and confirmed by pressing the button
"Mode".
The display now shows the countdown of days alternated with the
current flow temperature, as well as the normal operating symbols
of the indoor unit.
In case of failure, the function is suspended and will resume when
normal operating conditions are reset from the point where it was
interrupted.
In case of power failure, the function is suspended.
When the time expires, the indoor unit automatically goes back to
"Stand-by" mode, the function can also be stopped by pressing the
button "Mode".
3.23 SOLAR PANELS COUPLING FUNCTION
The indoor unit is prepared to receive pre-heated water from a sy-
stem of solar panels up to a maximum temperature of 65°C. In any
case, it is always necessary to install a mixing valve on the hydrau-
lic circuit upstream of the indoor unit, on the cold water inlet.
To optimise the operation, the solar inlet probe kit is available on
request (see wiring diagram Fig. 8).
To enable the use of the probe it is necessary to set parameter
T03>0.
This kit allows you to connect a probe on the domestic cold water
inlet pipe of the indoor unit, to prevent unnecessary start-ups in
systems with water heating through solar systems or alternative
sources.
The indoor unit will not turn on if the inlet water is sufficiently hot.
We recommend setting parameter T03 (solar delay timer) at a
time sufficient to let the water inside the D.H.W. circuit upstream
of the indoor unit drain.
The greater the distance from the storage tank, the longer wait
time will have to be set.
With these adjustments made, when a domestic withdrawal is re-
quested, once the time set on parameter "T03" has passed, if the
water entering the indoor unit is at a temperature that is equal to or
greater than that set, the indoor unit will not turn on.
In order for the indoor unit to work properly, the tempe-
rature selected on the mixing valve must be 5°C higher
than the temperature selected on the indoor unit control
panel.
Key (Fig. 63):
(A) - Upper set
(B) - Lower set
(C) - Days
(A)
(B)
62
(C)
63
83