Riello TAU Unit 50 Installation And Maintenance Manual page 55

Mode 2
(Working on climatic mode with attenuation controlled by a
room/heat demand thermostat, variable set point according to
the outdoor temperature)
In this case the thermal module operates with a set-point de-
fined by the climatic curve (which can be set in the same way as
described in Mode 1) depending on outdoor temperature. Heat
demand is actioned independently from whether the room/
heat demand thermostat's contact is closed and stops only
when the outdoor temperature is greater than the one defined
by the parameter 25.
In this mode the parameter 28 defines by how many degrees
the set-point is decreased (attenuation) when the room/ heat
demand thermostat's contact is opened.
Par.
Description
No.
Delivery temperature compensation at maximum ex-
109
ternal temperature in climate mode (Par. 1 = 1 or 2).
Establishes the max. set-point at the minimum out-
19
door temperature for climatic regulation
Establishes the minimum outdoor temperature to
20 which the maximum set-point can be associated for
climatic regulation
Establishes the minimum set-point at the maximum
21
outdoor temperature for climatic regulation
Establishes the maximum minimum outdoor tempera-
22 ture to which the minimum set-point can be associat-
ed for climatic regulation
Limits the minimum value that can be assigned to the
23 set-point in heating mode (does not apply to heating
mode 4).
Limits the maximum value that can be assigned to the
24 set-point in heating mode (does not apply to heating
mode 4).
Defines the temperature at which climatic regulation is
25
switched off
Use the heating mode Par. 1= 2 or 3. Defines how many
28
degrees the flow set point is lowered.
Delivery Temp.
(°C)
Par. 24
Par. 19
Par. 21
Par. 28
Par. 23
Par. 20
Parameter 109 Comp. T. @ T.ext. Max
During in-between seasons, when the external temperature
gets close to the maximum limit set in Par. 22, the delivery tem-
perature calculated in the climatic curve could be different from
the one suitable to meet the request. This parameter performs
a non-linear correction of climatic curve to compensate such
difference.
Tset max (°C)
Par. 109
Par. 109
Tset min (°C)
Par. 22 Par. 25
Outdoor Temp. (°C)
Mode 3
(Continuous fixed set-point operation with attenuation con-
trolled by room/heat demand thermostat)
In this mode the fixed set-point is adjusted in the same way
as described for Mode 0. The difference consists in the fact that
the demand is always active and the set-point is decreased (at-
tenuation) by the value defined by the parameter 28 when the
room/heat demand thermostat's contact is opened.
Par.
Description
No.
Sets the desired flow temperature with heating mode.
3
Active for the heating mode Par. 1 = 0 o 3
Limits the minimum value that can be assigned to the
23 set-point in heating mode (does not apply to heating
mode 4).
Limits the maximum value that can be assigned to the
24 set-point in heating mode (does not apply to heating
mode 4).
Use the heating mode Par. 1= 2 or 3. Defines how many
28
degrees the flow set point is lowered.
Delivery Temp.
(°C)
Par. 24
Par. 03
Par. 28
Par. 23
9
The outdoor temperature sensor (accessory) is not required
and if connected the outdoor temperature that is measured
does not influence the setpoint that has been set.
55
COMMISSIONING AND MAINTENANCE
Tset max (°C)
Setpoint @TA=ON
Attenuation setpoint
@TA=OFF
Tset min (°C)
Outdoor Temp. (°C)