Ariston NIMBUS PLUS M NET Manual page 88

To set the temperature adjustment parameters, simultane-
ously press and hold back "
"Enter code" appears on the display. Turn the knob to en-
ter the technical code (234) then press OK; the display will
show Technical area.
Turn the knob and select
- Complete Menu.
Press the OK button..
4 Zone 1 Parameters
Press the OK button.
Turn the knob and select:
4.5 Cooling
Press the OK button.
Turn the knob and select:
4.5.0 T set cool Z1
Press the OK button. Turn the knob and set the delive-
ry temperature setpoint, for thermoregulation off or fixed
point.
Press the OK button. Turn the knob and select:
4.5.1 Zone 1 Cooling Temp Range
Press the OK button.
Turn the knob and select the temperature range:
- Fan Coil
- Underfloor
Press the OK button.
Turn the knob and select:
4.5.2 Thermoregulation
Press the OK button. Turn the knob and set the type of
temperature adjustment installed:
- 0 ON/OFF
- 1 Fix Flow T
- 2 Outdoor T Only
4.5.3 Slope
Press the OK button. Turn the knob and set the curve in
relation to the type of cooling system, then press the OK
button.
- Fan Coil (curves from 18 to 33)
- Underfloor (curves from 0 to 30)
The checking process for the suitability of the curve requi-
res a long period of time during which several adjustments
may be necessary.
Graph A (Fan Coil)
°C 12
11
18
10
9
8
7
6
0 5 10 15
outdoor temperature
88 / GB
" and "OK" buttons until
33
25
20 25 30 35 40
When the outdoor temperature rises (summer), three con-
ditions may arise:
1. The temperature of the room may rise, indicating that a
gentler curve should be set;
2. The temperature of the room may fall, indicating that a
steeper curve should be set;
3. The temperature of the room remains constant, indica-
ting that the set curve is exactly right.
Once you have found the curve which maintains the room
temperature at a constant level, check the actual tempe-
rature value.
IMPORTANT:
If the room temperature is higher than the desired value,
the curve must be shifted downwards decreasing the pa-
meters 4.5.3. If the room temperature is too low, the curve
should be shifted upwards increasing the pameters 4.5.3.
If the temperature of the room corresponds to the desired
value, the curve is correct.
In the graph below, the curves have been divided into two
groups:
- fan coil systems (graph A)
- under-floor systems (graph B)
Press the OK button. Turn the knob and select:
4.5.4 Offset
Press the OK button. Turn the knob and set the most suita-
ble value. Press the OK button to confirm.
Turn the knob and select:
4.5.6 Max T
Press the OK button. Turn the knob and set the most su-
itable value according to zone temperature range (see
parameter 4.5.1), then press the OK button.
Turn the knob and select:
4.5.7 Min T
Press the OK button. Turn the knob and set the most su-
itable value according to zone temperature range (see
parameter 4.5.1), then press the OK button.
Repeat the steps described to set the values for zones 2
(if present), selecting menu 5.
Graph B (Underfloor)
°C 23
30
25
22
20
20
15
21
10
19
5
18
17
45 °C
0 5 10 15 20 25 30 35
outdoor temperature
40 45 °C