EVCO EPH4DXP1CT Installer manual - Manual (Page 63)

Evco S.p.A. c-pro 3 CLIMA sistema | Installer manual ver.1.1 | Code 144CP3CSE114
page 63 of 74
In the installation phase it is necessary to set a proportional regulation band and, if necessary, an integration
constant for a PI control, on the basis of system features.
8.2.6 Mixing valve delivery work set-point (MCCT module)
The summer/winter delivery mixing valve work set-point only has effect if the mixing valve is present and if the
modulation valve regulation is enabled.
If the mixing valve check is enabled, the regulation set-point of the delivery line will be given by the regulation set-
point calculated for the valve.
The regulation set-point can be the fixed type or linked to the linear calculation on the external air temperature
measurement.
If the external air temperature probe is present and functioning, the regulation set-point is calculated according to a
climatic curve.
If the external air temperature probe is not present or broken, the regulation set-point is fixed. It is established via a
relevant maintenance level parameter.
The climatic curve for calculation of the set-point envisions the setting of two pairs of External-Set-point temperature
values.
This two pairs determine a linearisation line of the two set-point values. All intermediate values relative to the external
temperature conditions included between the minimum and maximum values set are calculated between the two set-
point values.
The two climatic curves and set-points differ due to Summer and Winter functioning modes, separating the functioning
of the valve in the two seasons
8.2.7 Dew point control (MCCT, MCZN modules)
During the SUMMER functioning mode, the work set-point of the mixing valve (or delivery valve) will be continuously
monitored and if necessary modified in order to check the dew point of each individual active Zone.
The dew point is the temperature at which a mass of air must be cooled at constant pressure, so that it becomes
saturated (i.e. when the percentage of water vapour reaches 100%) and can therefore start to condense if further
heat is lost.
This would lead to the formation of dew in the cooled floor, thus compromising the integrity of the controlled room.
Every active Zone, equipped with room temperature and humidity sensor, calculates the temperature of its own dew
point and sends this data to the thermal power plant.
Given the different zones associated to the specific delivery line the thermal power plant regulator will consider the
highest dew point value sent by the individual zones as the dew point of the entire delivery line.
To consider the construction features of the system, the dew point will be raised by a predefined offset that can be set
by parameter.
The regulation set-point of the mixing valve (or delivery line) will be limited to the minimum value given by the
“delivery dew point + offset” calculated whenever necessary.