EVCO EPK4BHQ1AH Installer manual - Manual (Page 79)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 79 of 114
6.14 Dehumidification
In order to adjust the comfort of the room it is necessary to also consider the humidity in the air and regulate it based
on a determined desired Set point percentage (PU01) and at a neutral zone (PU02) in which the humidity conditions
are acceptable and do not require any intervention. The control of the dehumidification is proportional-integral, to
render it only proportional you need to only set the integral time to zero (PU04=0).
If the room humidity sensor is present it is possible to command a dehumidification process by utilizing the cooling coil
in order to eliminate the humidity from the incoming air. Dehumidification management is enabled by activating
parameter PG12=1, in the configuration menu.
6.14.1 Dehumidification control
The control utilizes the same cooling coil, thus implying that there are at least two configured coils (PG01>1). The
room air humidity sensor is also activated (PH41=1), if the sensor is disabled or in error dehumidification management
will be inhibited. Since the same coil is used for the cooling the control of dehumidification assumes the following
rules:
1) When requesting only cooling the coil is controlled according to the logic previously seen.
2) When requesting only to dehumidify the coil is utilized exclusively to dehumidify the room air and is illustrated in
the following graph:
3) In case where the requested actions are mixed and require both dehumidification and cooling you will need to
consider the average value of the two requests and the coil will be commanded with the arithmetic mean of the two
values.
PU01: Set Point
PU03
Room Humidity %
0 %
100
% NZ
PU02