ENABLE OR ACTIVE SOURCE?

Which sources to enable at any given time depends on the following factors:

1. For each source it is necessary to specify which Working mode is enabled: summer only, winter only, both;

2. For each source it is possible to specify with which Priority it is requested to work in winter and in summer (see );

3. For each source it is possible to specify a Source sensor, its calibration and its use (to control enabling or activation). In this way it is possible, for example, to detect the temperature of a tank and to decide, on the basis of that temperature, whether or not to activate a certain source;

4. For each source it is possible to define a digital input (Enable Signal) that indicates its “availability/enabling”; if it is defined, when the input is active the source is considered available, while when it is not active, the source is considered unavailable and therefore disabled (if the signal is not defined, the system considers the source as always available);

5. For each source it is possible to define a digital input (Block/alarm Signal); if it is defined when the input is active the source is disabled and it generates an alarm (if the signal is not defined the system considers the source as always enable):

6. For each source it is possible to specify some range on the outdoor temperature that enable its operation; ranges are specified independently between summer and winter working mode; when the outdoor temperature is outside the specified ranges, the source is disabled (if the outdoor probe is not configured the system considers the source as always enable).

The position of the 6 parameters listed above is shown in the following screenshot:

Warning

Do not use the Auxiliary sensor!

Activation and Enabling with Associated Sensor

If a sensor is associated, it is possible to use it for:

• To control Enabling

• To control Activation

1. To control Enabling

If it is used to control Enabling, besides the above points being true (the source must be in the season and outdoor temperature ranges in which it is enabled, it must have the correct priority, the enable signal if present must be entered and the block signal not entered), the sensor used must be in the water set point range set in the "Set point Control" section (in the case below in the range 20-55°C):

The source will be enabled as long as the sensor is > the minimum set - delta (in the example 20°C - 5°C, so up to 15°C) and as long as it is < the maximum set + hysteresis (in the example 55°C + 5°C, so up to 60°C).

Outside these temperatures it will be disabled, as you can seen by the absence of ticks in the last section “Source Status”, as the sensor reads 65°C.

The activation and deactivation of the source are instead linked to the Set Point arriving from the circuits (the highest in winter and the lowest in summer, offsets included). If the set point was higher than the maximum or lower than the minimum it would be cut off, so if a set point of 70°C arrives from the circuits, a maximum of 55°C is set for the source.

So, assuming a set point of 40°C (Desired T.), the source will activate if the sensor < 40°C and deactivate when the sensor > set point + hysteresis (so 45°C). The source will however remain enabled up to 60°C.

The auxiliary activation output, instead, is activated if the sensor < set point – delta (so in the case under consideration below 35°C = 40°C - 5°C) and it is deactivated when the sensor > set point – delta (so in the case the sensor is above 35°C).

2. To control Activation

If it is used to control Activation, the source must still be enabled, otherwise it will never be activated (the source must be in the season and outside temperature range in which it is enabled, it must have the correct priority, the enable signal if present must be entered and the block signal not entered), but its activation or deactivation depends only on the set point being reached.

Activation and deactivation of the source are linked only to the set point arriving from the circuits (the highest in winter and the lowest in summer, including offsets). If the set point was higher than the maximum or lower than the minimum, it would be cut off, so if a set point of 70°C arrives from the circuits, a maximum of 55°C is set to the source.

So, assuming a set point of 36°C, the source will activate if the sensor < 36°C and deactivate when the sensor > set point + hysteresis (so 39°C). 

The source will always remain enabled regardless of the temperatures reached by the sensor. In the above case, even if the sensor is at 30°C, the source is always enabled.

The auxiliary activation output, on the other hand, is activated if the sensor < set point – delta (so in the case under consideration below 31°C = 36°C -5 °C) and is deactivated when the sensor > set point – delta (so in the case above 31°C).

Activation and Enabling without Associated Sensor

If there is no associated sensor, when a circuit requests the source (assuming the source is in the season and outdoor temperature range in which it is enabled, it has the correct priority, the enable signal if present is entered, and the block signal is not entered) then the source will be enabled and active without distinction. The auxiliary activation output will also always be active.

SOURCE STATUS

In the last section at the bottom of each source there is a summary which at a glance shows whether the source is enabled, active, in cooling mode and whether the external and water temperatures are within the source’s enabling ranges:

There is also a comparison between the desired temperature coming from the circuits (set point) and the temperature of the sensor used, if present (Actual Temperature).

The Actual Output corresponds to the set point that would be sent to the source if a 0/10V set point output were connected.

For the degraded source part, see .

AVAILABLE DIGITAL OUTPUTS

The digital output available for the sources are:

• 52. Source 1 Enable

• 53. Source 1 Active

• 54. Source 1 Auxiliary

• 55. Source 1 Auxiliary denied (function 54 denied)

From 56 to 59 are the same for source 2 and from 60 to 63 for source 3.

AVAILABLE ANALOGUE OUTPUTS

The analogue output available for the source is:

• 17. Source 1: it corresponds to the desired temperature, therefore to the set point received from the circuits (+/- offset), which can be sent to the source if it can receive a 0/10 set point input signal.

For source 2 is the output 18, 19 for source 3.