85
INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
3.20 PREHEATING FUNCTION
In case of DHW or heating demand, if the water temperature is
lower than 20 °C, the operation of the integration electric resist-
a n c e i s f o rc e d u n t i l 2 5 ° C a r e r e a c h e d .
3.21 DIVERTER VALVE MANAGEMENT
SUMMER / WINTER.
e unit electronics has a 230V outlet to manage the summer /
winter diverter valves.
e voltage output is active when the appliance is in Air-condi-
tioning mode.
3.22 AUTOMATIC VENTING FUNCTION
In the case of new central heating systems and in particular mode
for oor systems, it is very important that deaeration is performed
correctly.
e fu nction consists of t he cyclic activat ion of the pump a nd the
3-way valve.
e f u n c t i o n i s a c t i v a t e d i n t w o d i e r e n t w a y s :
- Each time the heat generator is re-powered;
- Using parameter “U 50”.
In the rst case, the function has a duration of 8 minutes and it can
be interrupted by pressing the “Reset” button (3). In the second
case, it has a duration of 18 hours and it can be interrupted simply
by switching the heat generator on.
Activation of the function is signalled by the countdown shown
on the indicator (14).
3.23 SCREED HEATER FUNCTION
e 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.
e active zone pumps are those with ongoing requests, made via
the room thermostat input.
e f u n c t i o n i s a c t i v a t e d f r o m i n d o o r u n i t i n s t a n d - b y b y p r e s s i n g
and holding the buttons “Reset” and “Mode” for more than 5 sec-
onds (Fig. 66).
e standard function lasts in total 7 days - 3 days at the lowest
temperature set and 4 days at the highest temperature set (Fig. 67).
Duration can be changed by changing the value of parameters "T
22" and "T24".
Aer 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.
e temperature is selected by means of the buttons “+” and “-” of
the system side (
) and conrmed by pressing the button
“Mode”.
e display now shows the countdown of days alternated with the
current ow 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.
I n c a s e o f p o w e r f a i l u r e , t h e f u n c t i o n i s s u s p e n d e d .
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”.
66
(A)
(B)
(C)
67
Key (Fig. 67):
(A) - Upper set
(B) - Lower set
(C) - Days
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