Operation Manual

17
♦ DHW temperature display
If any other variable is displayed at the moment (heating water temperature, output, error message etc.),
pressing any of the buttons 2 opens the DHW temperature dialogue. This display is indicated by the °C pilot
light above button 4.
In the case of sensor defect or absence, the numerical data become replaced with dashes: _ _ _ during disconnection or interruption of the
sensor or wiring, ¯ ¯ ¯ after a short circuit on the sensor or wiring.
♦ Displaying and change (setting) of the desired DHW temperature value
If you press any of the ▲ , ▼ buttons (2) with the display showing the DHW temperature dialogue, you can
set its desired value. The setting process is indicated by flashing of the °C pilot control above the O/I
(ENTER) button (4). You can set the desired temperature value by pressing the ▲ , ▼ button (2) within the
range defined by the TU_ a TU¯ (P3.5 a P3.6) items of the service menu. The set value does not need to be
confirmed. The setting mode for the required values terminates 15 seconds after any of the ▲ , ▼ (2) buttons
has been last pressed.
The desired DHW temperature value can be set only if the rtU DHW heating mode is set to b_c (P3.2 = 2) (storage tank with the
temperature sensor).
♦ Switching the heating on or off
The heating mode can be switched on or off by pressing the O/I (MENU) button (3). The on-mode is
signalled by the pilot light between ▲ , ▼ buttons (1); the pilot light in the off-mode is turned off.
Heating can be switched on only if its operation is pre-set in the user menu; the rto item must be set to tEr, EtE, Prt, otP or ot- (P3.1 =
1 – 5).
♦ Switching the DHW heating on or off
The DHW heating mode can be switched on or off by pressing the O/I (ENTER) button (4). The on-mode
is signalled by the pilot light between ▲ , ▼ buttons (2); the pilot light is off if the DHW is in the off-mode.
The DHW heating can be switched on only if its operation has been pre-set in the service menu; the rtU item must be set to b_n or b_c
(P3.3 = 1 or 2).
♦ Displaying the outdoor/room temperatures
To display any other operational variables (except for the heating water and DHW temperatures), use the
(SELECT) button (5). If you press (or double press) it, the outdoor/room temperature display dialogue opens.
This dialogue is indicated by the IN/OUT °C pilot light.
In the case of sensor defect or absence, the numerical data become replaced with dashes: _ _ _ during disconnection or interruption of the
sensor or wiring, ¯ ¯ ¯ during short circuit of the sensor or wiring
The difference between displaying the room or outdoor temperature rests only in the location of the sensor. Shall the boiler operation be
controlled on the basis of its data, the respective mode must be selected in the user menu:
- for rto = EtE (P3.1 = 2) (integrated equitherm regulation) outdoor sensor must be used,
- for rto = Prt (P3.1 = 3) (integrated room thermostat) sensor in the room of reference must be used.
If the sensor is connected but the boiler operation is not controlled on the basis of its data, these data are used at least for protecting the
system against freezing.
♦ Displaying the heating system pressure
If you press (or double press) the (SELECT) button (5), the system pressure dialogue opens. This display
dialogue is indicated by the bar pilot light.
Minimum operation pressure of the system is 0.5 bar.