EVCO EPK4BHQ1AH Installer manual - Manual (Page 88)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 88 of 114
6.17.1 Heat recovery devices at cross flow
In order to utilize this recovery device it is necessary to set PG13=1. The heat recovery devices provides a by-pass
shutter which is used to prevent the passage of outdoor air through the air exchange channels.
The heat recovery device is normally always active and is by-passed during the free-cooling/free-heating phases or
during the defrost cycles with external temperatures that are too low. Set the set point (Pr03) and the relative
differential (Pr04) in order to activate the defrost cycle.
When the minimum temperature conditions of the exhaust air are reached, as represented in the diagram, a cyclical
sequence of heat recovery device by-pass are activated in order to permit the exhaust air (hot, room air) to defrost
the air exchange channels.
After the delay Pr05 the by-pass shutter will activate in order to allow for defrosting. When the temperature rises
above the allowable value the shutter will deactivate while the heat recovery device restarts.
Note: when the control sensors are in error the function is disabled.
Pr03: Set
OFF
Pr04:
ON
T. Expulsion
OFF
ON
Minimum expulsion
temperature
Shutter By-Pass
OFF
ON
Pr0 Pr0