EVCO EPH4DXP1SA - Manual (Page 34)

EVCO S.p.A. c-pro 3 hecto MCSA | User manual ver. 2.0 | Code 144MCSAE204
page 34 of 52
5.2.6 Controlling the high and low flow temperatures
Whenever the flow water temperature exceeds the maximum temperature value or drops below the minimum
temperature value allowed for the hysteresis value of the system, then the regulator will start special management
cycles for this emergency:
High temperature protection: the mixing valve is closed immediately in order to prevent overheating in the system
controlled, until the temperature returns to the maximum values allowed for the system.
Low temperature protection: after a fixed delay of 60 seconds, the circulation pump is activated to facilitate heating
the system water. The pump will remain on until the minimum temperature conditions have been recovered.
5.2.7 Flow anti-freeze protection
During winter operating mode when the system is not running (i.e. in OFF status or with time periods enabled but on a
day when the system is off), a flow anti-freeze protection control is however active.
If the external temperature goes below the pre-defined anti-freeze threshold, the system will run with special
activation cycles of the circulation pumps, in order to prevent breakages in the system due to frozen pipes.
Eternal temperature lower than -4.0 °C: flow pump always active;
External temperature between -5.0 and 1.5 °C: flow pump active 10 minutes every 6 hours;
Eternal temperature higher than 1.5 °C: flow pump off
When the external temperature is between -4.0 and -5.0 °C flow pump behaviour depends on the previous situation.
5.3 Regulation of zone humidity
5.3.1 Regulation principle
Whenever the function is enabled, during SUMMER operating mode when the relative humidity detected by the
environment humidity transducer is over the active zone humidity set-point value, the regulator will activate the
collector/dehumidification consent.
Whenever dehumidification makes use of flow water for its action (established via the relevant parameter), the
activation of the zone collector/dehumidification valve generates the same sequence of activations/controls, triggered
with zone heating/cooling.
For its operation, consult zone temperature regulation.
5.3.2 Management of the dehumidifier
The dehumidifier control is activated when the environment relative humidity value is over the active environment
humidity set-point + hysteresis value (differential).
Depending on the value assumed by parameter PD01 (Use of flow water enabled for dehumidification), as well as the
output for dehumidifier control, the circulation pump and the mixing valve can be activated.
• PD01 = 0 – only the dehumidifier control is activated
• PD01 = 1 – the dehumidifier and the circulation pump are activated
•
PD01 = 2 – the dehumidifier control, the circulation pump and the mixing valve are activated
5.3.3 Zone humidity work set-point
The zone humidity set-point is decided in manual mode via the relevant user parameters present in the regulator or in
automatic mode, set by the final user via the programmed weekly time periods.
To set the automatic humidity work set-points (Economy and Comfort set-points), consult the dedicated paragraph.