Temperature Adjustment - Ariston NIMBUS EXTERNAL UNIT 04 kW Technical Instructions For Installation And Maintenance

Temperature adjustment

To set the temperature adjustment parameters, simultaneously press
and hold the back " " and "OK" buttons until "Enter code" appears
on the display.
- Turn the knob to enter the technical code (234) then press OK;
TECHNICAL AREA will appear on the display.
Turn the knob and select:
- COMPLETE MENU
Press the OK button.
Turn the knob and select:
4 Zone 1 parameters
Press the OK button. Turn the knob and select:
4.2 Zone 1 settings
Press the OK button. Turn the knob and select:
4.2.0 Z1 T range
Press the OK button.
Turn the knob and select the temperature range:
- 0 low temperature
- 1 high temperature
Press the OK button to confi rm.
Turn the knob and select:
4.2.1 Type selection
Press the OK button. Turn the knob and set the type of temperature
adjustment installed:
- 0 Fixed delivery temperature
- 1 Devices ON/OFF
- 2 Ambient sensor only
- 3 External sensor only
- 4 Room sensor + outdoor sensor
press the OK button. Turn the knob and select:
4.2.2 Temperature adjustment curve
Press the OK button. Turn the knob and set the curve in accordance
with the type of heating system and press the OK button.
- low-temperature system
(fl oor panels)
curve between 0.2 and 0.8
- high-temperature system
(radiators)
curve between 1.0 and 3.5
The checking process for the suitability of the curve requires a long
period of time during which several adjustments may be necessary.
When the outdoor temperature falls (winter) three conditions may
arise:
1. The temperature of the room may fall, indicating that a steeper
curve should be set
Curve graph
°C 100
90
80
70
60
50
40
30
10
3.5 3.0 2.5 2.0
1.5
1.2
1.0
0.8
0.6
0.4
0.2
5 0 -5 -10 -15 -20 °C
outdoor temperature
2. The temperature of the room may rise, indicating that a gentler
curve should be set
3. The temperature of the room remains constant, indicating that the
set curve is correct
Once you have found the curve which maintains the room tempera-
ture at a constant level, check the actual temperature value.
Turn the knob and select:
4.2.3 Parallel shifting
press the OK button. Turn the knob and set the most suitable value.
Press the OK button to confi rm.
IMPORTANT:
If the room temperature is higher than the desired value, the curve
must be shifted lower. If the room temperature is too low, the curve
should be shifted upwards. If the temperature of the room corre-
sponds with the desired value, the curve is correct.
In the graph below, the curves have been divided into two groups:
- Low-temperature systems
- High-temperature systems
The two groups are divided based on the different point of origin of
the curves for high-temperature systems, which is +10°C - a cor-
rection which is usually made to the fl ow temperature in this type of
systems during climatic adjustment.
Turn the knob and select:
4.2.4 Proportional room infl uence
press the OK button. Turn the knob and set the most suitable value,
then press the OK button.
The infl uence of the room sensor can be adjusted to a value between
20 (maximum infl uence) and 0 (no infl uence). This means the contri-
bution of the room temperature to the delivery temperature calcula-
tion can be adjusted.
Turn the knob and select:
4.2.5 Maximum delivery temperature
press the OK button. Turn the knob and set the most suitable value,
then press the OK button.
Turn the knob and select:
4.2.6 Minimum delivery temperature
Press the OK button Turn the knob and set the most suitable value,
then press the OK button.
Repeat the steps described to set the values for zone 2, selecting
menu 5.
NOTE:
For correct operation of the temperature adjustment types 2.
Room sensor only, 3. external sensor only, 4. Room sensor plus
external sensor, parameter 17.1.1 should be set to value 1., or the
AUTO function must be activated.
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