Evco EV3K11 User Manual

EVCO S.p.A. EV3 MVC & EVD MVC | Application manual ver. 1.0 | Code 144EV3MVI104
page 49 of 72
the need for defrosting remains the speed of both fans will be reduced in parallel down to the minimum permitted speed (C06). If the
expulsion temperature falls below the critical value d11, the rotary recovery heat exchanger stops or the bypass damper opens
for the cross-flow recovery heat exchanger.
The fan speeds gradually return to their normal value when the expelled air temperature rises to above the value of d09+d10/2.
Regardless of the fan speed regulation settings these are suspended while defrosting in in progress. When defrosting is finished, the
fan speed regulation returns to the normal settings.
In the event of manual regulation, it is possible to set a different value for the fan speeds, but this value will only be valid when
defrosting is finished.
9.6 Regulating the mixing chamber damper
When present, the mixing chamber damper regulates the quantity of recirculated air and external air emitted into the environment
(damper completely closed = all recirculated; damper completely open = all external air).
The percentage of damper opening therefore influences the following factors:
- Temperature (free cooling/heating and off band)
- Humidity (winter dehumidifier)
- CO2.
The controller regulates the opening of the mixing chamber damper using the modulating 0-10 V output, to activate the function the
analogue output Mixing chamber damper should be configured.
This regulation works with that of the fans both in terms of the percentage increase/decrease (C12) and the relative timing (C13).
In normal conditions the damper is open by at least the minimum opening percentage (C08) to guarantee the minimum air exchange in
the environment. It is possible to set the minimum opening higher when the compressor is active (if present) to provide a greater air
flow by changing parameter C36.
There are some conditions in which the minimum opening setting is not applied (damper completely closed):
- If the machine is in stand-by
- If the regulation temperature is "off-band"
- If the fans are in alarm mode.
If the free cooling or free heating functions are activated, the mixing chamber damper is completely open.
In all other situations the damper opening depends on the configuration of the machine in the following order of priority:
- If the CO2 sensor is configured and not in alarm mode, the damper opening depends on the value detected by this probe as
described in the relevant paragraph.
- If the humidity sensor is configured and not in alarm mode, the "heating" function activated and the winter dehumidifier
enabled, the damper opening depends on the value detected by this probe as described in the relevant paragraph.
- If none of the above situations apply, the damper opening is determined by the regulating settings (P14…P17) associated
with the timer setting in progress.
9.7 Temperature regulation
The temperature regulation algorithm is of the "incremental neutral zone" type previously described. The temperature used for
regulation can be the room temperature or the supply temperature if only one of these probes is configured. If neither of the probes is
configured or if they are in error, temperature regulation is inhibited.
If both the probes (room and supply) are configured, the regulation probe is the supply temperature but the setpoint is adjusted to the
room temperature (follow-on regulation) as shown in the diagram below.
Cooling Heating

Evco EV3K11 Specifications

General

Brand	Evco
Model	EV3K11
Category	Controller
Language	English