EVCO EPU2BXP1S1 - Manual (Page 47)

EVCO S.p.A. c-pro 3 micro SAVE/ c-pro 3 kilo SAVE | Application Manual ver. 1.0 | Code 144CP3UKSAE104
EVCO
page 47 of 68
6.7.1.3 Automatic regulation with presence sensor
In addition to the previous regulation rules it is possible to modify the working Speed/capacity on the basis of a
presence sensor. If the presence sensor is active (indicating there is someone inside the room), during the COMFORT
time band the fans Speed/capacity is forced to the value set on parameter PF12.
6.7.1.4 Fans thermal overload
Via the digital inputs DI3/DI4 Supply/Return fans thermal overload protection it is possible to enable the thermal
overload alarm of each fan. The alarms are signalled after a fixed delay of 2 seconds and have automatic reset. The
alarms are enabled setting PA03=1. If this is not the case, the thermal overload alarms of the two fans are disabled.
The activation of the thermal overload alarm switches OFF the unit bringing it to the OFF due to alarm status.
6.7.1.5 Fans status
Each of the two fans can be in the following working states:
1. OFF: the fan is OFF.
2. ON V1: the fan is ON at speed 1.
3. ON V2: the fan is ON at speed 2.
4. ON V3: the fan is ON at speed 3.
5. Switch-ON stand-by: the fan is to be switched-on. Timing is in progress, e.g. stand-by due to pre-start of the
outside air damper. The status shows the switch-on stand-by for each of the individual speeds.
6. Switch-OFF stand-by: the fan is to be switched-off. Timing is in progress, e.g. in the case of post-ventilation.
7. Alarm: the fan is in alarm conditions due to thermal overload.
Reaching of the individual speed in switch-ON can be delayed via the parameter PF06. If PF06=0 switch-ON/OFF is
immediate.
6.7.1.6 Fans running hours
Each fan has an associated variable that counts the number of running hours (Supply fan parameter PM02, Return fan
parameter PM03). The running hours can be zeroed by resetting the relevant parameter.
If the running hours set in the PM01 parameter are exceeded, an alarm is given indicating fan running hours exceeded
(alarms AL09, AL10).
6.7.2 Recovery heat exchanger anti-freeze protection
A probe measures the temperature T of the exhaust air after the recovery heat exchanger on the extraction circuit.
The critical defrosting temperature Tg (can be set by parameter PF07) is fixed by default at 0 °C. Considering the risk
of frost in the recovery heat exchanger when T ≤ Tg it is necessary to take some action for protecting the exchanger
when this temperature level is reached. To use this function the PG06 parameter must be enabled (by default it is
always enabled).
There are two possible strategies depending on the presence of the by-pass damper of the recuperator (PG01
parameter).
Note: If the anti-freeze temperature probe is in error conditions, this regulation is not enabled and the fans are
regulated exclusively on the basis of the PF01 parameter.