Introduction
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The system calculates the Dew Point Temperature (Dew Point) for each zone equipped with a temperature+humidity sensor, that is the critical temperature below which condensation forms under the zone’s current conditions.
The Dew Point Temperature, corrected by an offset that can be set differently from zone to zone (Dew Point Control parameter, indicated as Ctrl DP in the Configuration Zone/1 sub page), is compared with the Outlet temperature of the circuit serving the zone; if the water temperature is equal or below the calculated limit, there are the conditions for condensation formation.
If the circuit serving the zone is equipped with a mixed valve controlled by the REG System, the Outlet temperature of the circuit is increased if the water temperature is too close to the Dew Point Temperature, otherwise the zone will be blocked.
Note
For zones used as “Integration” to the dehumidifiers in Cooling system, the Dew Point Control (Ctrl DP) value must be set very high (in the order of 20°C), because the associated user does not act directly on the radiant surface, but it is a “Support” to the action of the dehumidifier.
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Screed thickness
Materials used for floor construction
Radiant system pipes materials
Note
Within the Zone section (in the red frame), for each zone equipped with humidity and temperature sensor, the Dew Point (°C), indicated by the abbreviation DP in the green frame, is calculated:PHOTO TBD
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for the zones without humidity sensor, the DP is NC, not calculated.
The calculated DP must be compared with the floor surface temperature, which is the sum of the cold-water temperature and of a delta that take into consideration the type of covering. The parameter that allows the delta to be taken into account is the Dew Point Control (K, Kelvin degrees are used to indicate that the parameter is a temperature difference and not a temperature value), indicated by the abbreviation Ctrl DP in the green frame:PHOTO TBD
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Let us, for example, consider the zone 61, for which the calculated dew point is 15°C 15,1°C and the Dew Point control is equal to 3 K. The calculated dew point (15°C15,1°C) will not be compared to the value read by the circuit water outlet temperature of the circuit associated with the zone (C2C1), but with the value read by the probe of C2 + 3 K. The zone 6 Zone 1 will be blocked to prevent condensation if the water outlet temperature of the associated C2 circuit is less then 12°C (15°C 12,1°C (15,1°C - 3 K). While zone 7 will be blocked if the water outlet temperature of the associated C2 circuit drops below 10,3°C (13,3°C - 3 K).
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Considering, for example, to use 3 K as Offset DP/Water outlet T and having a zone which is connected to the circuit 1 which is at risk of condensation if the water outlet temperature < 6,8°C (calculated DP = 7,3°C and CtrlDP = 0,5 K with 0 = the room temperature is not considered), it can be seen that the lower outlet limit is 6,8°C + 3 = 9,8°C, which also corresponds to the set point (desired temperature) > 5°C which would be the set point of the cold circuit in Comfort mode:
PHOTO TBD
Obviously, the Offset/Outlet applies to all circuits when only one of the connected zones is at risk of condensation. It could be that other zones are not at risk of condensation and the increasing of the water outlet temperature to avoid a single zone from blocking prevents the other zones from being cooled.
If you want to limit the effect of Offset / Outlet on a circuit, you must use the parameter “Dew Point Correction Limit”, which is a temperature value (not a delta):
PHOTO TBD
If left at zero, it is as being switched off. If different from zero, it represents the maximum increase allowed for that circuit. In the example below, 12°C represents the maximum increase, above 12°C the set point in cooling will not be raised:
PHOTO TBD
At this point, the zone block will intervene for the zone at risk of condensation, but the rest of the system can keep cooling the zones not at risk of condensation.
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