EVCO c-pro micro SAVE - Manual (Page 41)

C-PRO MICRO SAVE APPLICATION MANUAL
Page 41
6.7.3 Fresh air intake damper
It is possible to manage an optional motorised damper (can be enabled by parameter PG04=1) for
fresh air intake purpose. The damper is managed via ON/OFF (digital) activation. The damper can
be either fully open or fully closed, modulation is not possible as well as a minimum opening.
When the fans are requested to start first the damper is opened and, after a delay configured on
parameter PS01, the fans are activated too.
When the fans are switched OFF the damper is kept open for a time configured on parameter PS02.
6.7.3.1 Fresh air intake damper limit switches
In order to have a feedback about the real status of the damper (fully open or fully closed) the
digital inputs DI9 and DI10 are connected to the damper’s “fully open” and “fully closed” limit
switches. Every time the damper is requested to change its status it is verified that both limit
switches change their status within the expected time frame (defined on parameter PS05). If during
this time the states of both digital inputs change this means everything is working fine. If this is not
the case the AL06 alarm with manual reset is generated and the unit is brought to the “OFF due to
alarm” status.
6.7.4 Heating
The COMPLETE solution offers the possibility to use a hot water coil or a set of three electric
heaters for space heating purpose. By setting the PG02 parameter the desired resource is activated
along with the relevant alarms connected. For using this function it is necessary to enable the supply
temperature probe setting PH40=1.
During the anti-freeze protection of the recovery heat exchanger, on units without by-pass, the
heating source must be deactivated for protection. The heating source is disabled with a delay
defined at the parameter PF09 after the fan speed has reduced to V1 during the supply fan speed
decrease for antifreeze protection. If the antifreeze condition remains active for further PF09 the
supply fan is stopped.
6.7.4.1 Heating with hot water coil
To use the hot water coil for space heating it is required to set the parameter PG02=1. The control
is based on the supply temperature via a supply Set Point (SPHM parameter) and a relevant
differential (Pb02 parameter). The coil is controlled via a proportional-integral algorithm (PI). The
control can be only proportional by setting the integral time Pb03=0.
In case the control probe has an alarm condition it is possible to decide the opening percentage of
the coil valve during alarm setting the Pb04 parameter. If Pb04 = 0.0% in probe error condition the
valve remains closed.
SPHM: Set Point
0%
Supply Temp. Pb02: Diff
100%