1.5.1 ON and OFF
From the STANDBY mode, by touching the
Standby
key the unit
becomes OPERATIONAL, turning the display on. From OPE-
RATIONAL state, by touching the
Standby
key the unit goes to
STANDBY mode, turning the display off. In both cases an acou-
stic signal confirms each action.
In STANDBY mode the burner does not start when a tap is ope-
ned.
1.5.2 NORMAL Operation
The water heater’s NORMAL operation instantly provides dome-
stic hot water at the required temperature and set by the user.
When the water heater’s normal operation is activated, the real
water outlet temperature is shown, and the
symbol is tur-
ned off.
1.5.2.1 Temperature Setting
The outlet water temperature can be set with the “
+
” and “
–
”
keys.
The NORMAL temperature setting is between 35 °C and 50 °C
(
the maximum value, initially 50 °C, can be changed via the
nS parameter, see Section 3.5
)
.
The normal temperature set-
ting is
50 °C
by default.
1.5.2.2 Domestic Hot Water
When the tap is opened and a water flow is detected by the
flowmeter, the unit begins to operate, and the
symbol lights
on the display.
The fan symbol
and the flame symbol
come on ac-
cording to the state they are in.
When the tap opens the bottom digits display shows the current
water flow rate (
).
The water heater will heat water continually for a maximum of 60
minutes
(value which can be changed via the nE parameter,
see Section 3.5)
, after which it will stop for safety reasons.
1.5.3 ECO mode
This mode is generally used to reduce energy consumption.
When this function is enabled the
symbol is shown on the
top digits display.
In ECO mode the outlet capacity is limited to 80 % of the maxi-
mum value, and a separate temperature setting is used.
1.5.3.1 Enabling ECO mode
If this mode is disabled, you must touch the
ECO
key. The
symbol will then light immediately on the display.
During this mode, when opening the tap the burner begins the
ignition sequence and when the electrode detects the flame, the
unit keeps the burner on and modulating the fan and the gas.
1.5.3.2 Temperature Setting in ECO mode
In this mode the water temperature setpoint can be different to
that in the NORMAL mode, but it will never be higher than it.
This ECO temperature setting, just like the NORMAL one, can be
changed with the “
+
” and “
-
” keys.
The ECO temperature setting is therefore between 35 °C and
the NORMAL temperature setting. The normal ECO temperature
setting is
42 °C
by default.
1.5.3.3 Disabling ECO mode
To deactivate this mode, touch the
ECO
key on the control panel.
The
symbol goes off.
1.5.4 Solar Energy Function
To operate the water heater together with solar panels and use
the solar energy they supply, there are some parameters that de-
fine the water heater’s behavior. The water heater will only acti-
vate when the inlet water temperature, produced by solar energy,
is lower than the set temperature.
In the description of parameters (
see Section 3.5
), “
FC
” must be
on “ON”, as there are 3 other key parameters:
S1: Hysteresis to turn the burner on (°C)
S2: Hysteresis to turn the burner off (°C)
t1: Delay time to turn the burner on (seconds)
• When the inlet water T is < (setting T - S1), the burner starts the
t1 timing, or the time after which the burner ignites.
• When the inlet water T is > (setting T + S2), the burner turns
off.
Once the burner has ignited, for the first 30 seconds, to prevent it
from continuously going on and off when starting, the control unit
automatically increases the turned off T to the setting T + 30 °C.
To change these parameters, S1, S2 and t1, see Section 3.5.
Parameter list.
62
EN
CETI
A73023711 - Rev. 00 - 2022-10
