Direct Digital Controller
136 Direct Digital Controller fw 4.013 – Ed. 01/2013
The temperature sensor must be connected to the terminals provided for this purpose on the rear of the Direct
Digital Controller (see detail E in Figure 13 on page 54).
In AmbT operating mode with two-line hot/cold plants, the
icon in the “Plant control” menu allows
COOLING or HEATING mode to be selected respectively.
In cooling mode (see Figure 29), the plant is on until the ambient temperature value set (T) is reached; when
the ambient temperature value set (T) is reached, the plant switches off and switches on again if,
subsequently, the ambient temperature value set + the differential value set (T + Diff) is reached.
In heating mode (see Figure 30), the units start until the temperature value set (T) is reached; when the
ambient temperature value set (T) is reached, the plant switches off and switches on again if, subsequently,
the ambient temperature value set – the differential value set (T – Diff) is reached.
For operation with an ambient temperature sensor, it is necessary to programme the ambient
chronothermostat (see Paragraph 3.4.1.2.3 - “Chronothermostat” on page 43).
Figure 28 – EXAMPLE OF AMBIENT TEMPERATURE SENSOR CONNECTION FOR AmbT MODE
Figure 29 - OPERATING PRINCIPLE IN AmbT/ExtT MODE
(COOLING)
Figure 30 - OPERATING PRINCIPLE IN AmbT/ExtT MODE
(HEATING)
SET
+ Diff.
ON
OFF
T
T + Diff.
SET
- Diff.
ON
OFF
T
T - Diff.
NOTE
1 2 3 4 5 6
ddc
INTERNAL AMBIENT
TEMPERATURE SENSOR
T
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