EVCO S.p.A.
EV3 HRV & EVD HRV
| Application manual ver. 1.0a | Code 1443DHRVE104
page 49 of 74
10
FUNCTIONING OF THE CONTROLLER
10.1
Regulation in the incremental neutral zone
The working parameters for regulation in the neutral zone consist of a setpoint, a regulation band, a reaction time and an incremental
step. Almost all the available functions use these regulating mechanisms.
Because this system is extremely easy and intuitive to operate it provides excellent results, allowing precise regulation.
The neutral zone is between the setpoint:
1) When the variable being controlled is within the neutral zone, the regulation does not amend the corresponding output value.
2a) When the regulation variable falls below the neutral zone, the regulation immediately increases the controlled output value by a
percentage equal to the value expressed by the relevant parameter (incremental/decremental regulation step)
2b) If the regulation variable is not within the neutral zone by the time set by the parameter “reaction time”, point 2a above is
repeated until the maximum possible value of the output value is reached.
3) The regulation procedure is inversed when the variable being controlled rises above the neutral zone.
The diagram below is a graphic representation of the operating mode.
10.2
Activating free heating/cooling
This mode is activated if the
room probe
and
external probe
are activated and not in alarm.
If the external temperature is favourable this inhibits the recovery heat exchanger (bypass or deactivation) so as to use the external air
to improve the room comfort.
If the controller detects favourable conditions with a differential between the external and internal temperatures capable of cooling or
heating the room, the recovery heat exchanger bypass is activated (bypass damper activated, rotation of the rotary exchanger
deactivated, compressor switched off) and the mixing chamber damper is fully opened.
Activation of these functions naturally leads to the room temperature coming close to the relevant setpoint thus requiring no further
forced regulating action. The two functions are therefore completely independent.
10.2.1
Summer mode (free-cooling)
When the temperature rises above the regulation setpoint, thus requiring cooling, and when the conditions shown in the diagram below
apply, the recovery heat exchanger bypass is activated (bypass damper activated, rotation of the rotary exchanger deactivated,
compressor switched off).
10.2.2
Winter mode (free-heating)
When the temperature falls below the regulation setpoint, thus requiring heating, and when the conditions shown in the diagram below
apply, the recovery heat exchanger bypass is activated (bypass damper activated, rotation of the rotary exchanger deactivated,
compressor switched off).
