Operation Manual

20
Group 2: Integrated room thermostat parameters
An integrated room thermostat can control heating operation according to the data from internal temperature
sensor. It uses proportional control to set the outlet water temperature within the range defined by the tdr (P2.3)
parameter:
- if TM < ti1 - tdr (TM < P2.1 – P2.3), heating is controlled to reach the maximum heating water temperature
to¯ (P3.4),
- if TM > ti1 (TM > P2.1), heating is controlled to have the minimum heating water temperature to_ (P3.3),
- if ti1 - tdr < TM < ti1 (P2.1 – P2.3 < TM < P2.1), the desired heating water temperature is calculated by the
interpolation between to_ and to¯ (P3.3 a P3.4),
- if TM > ti1 + tdF, the heating is switched off completely.
The aforementioned is true if the NU binary input specification is “disconnected”. If the NU binary input
specification is “connected”, a value of ti2 (P2.2) is used instead of ti1 (P2.1).
ti1 P2.1 Desired value of the room temperature. True if NM is “disconnected”.
The setting range falls between 10 and 30°C, step of 1°C, leading value is 21°C.
ti2 P2.2 Desired value of the room temperature. True if NM is “connected”.
The setting range falls between 10 and 30°C, step of 1°C, leading value is 19°C.
tdr P2.3 Temperature range of room in which the proportional control of the desired outlet water
temperature value takes place.
The setting range falls between 2 and 10°C, step of 1°C, leading value is 3°C.
tdF P2.4 Difference (hysteresis) between the shut-down and repeated initiation of heating when the
desired room temperature has been exceeded.
The setting range falls between 0.25 and 2.50°C, step of 0.25°C, leading value is 0.5°C.
Complete heating shut-down occurs if the room temperature exceeds the set value by more than tdF (P2.4).
Heating is again switched on only when the room temperature drops below the set value.
Group 3: Heating setting and display mode
rto P3.1 Heating mode (TOP)
The boiler operation is conditioned by the connection of the external room thermostat PT terminals at all
possible settings. If the thermostat is not used at all, it is necessary to create a permanent connection between
the PT terminals.
Settings options:
--- 0 Heating switched off. It is not possible to switch it on even by means of button 3. Anti-freeze
protection is active.
tEr 1 Heating is controlled by the external room thermostat contact and the outlet water temperature
is set by buttons 1.
EtE 2 Heating is controlled by integrated equitherm regulator. Outdoor temperature sensor must be
connected.
In the case of a defective sensor or if it is not connected, the boiler is controlled in the tEr (like at P3.1 = 1) mode.
Prt 3 Heating is controlled by integrated room thermostat. The room temperature sensor must be