EVCO c-pro nano CHIL - Manual (Page 113)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 113
PP03 = Pump OFF cycle time.
Parameter PP07 defines the pump’s behaviour during a defrosting cycle. Parameters PP01 and PP07
may only be modified while the machine is switched OFF.
It two pumps have been configured (PG09 = 2), both their operating hours must be equalised.
Therefore, every PP08 number of operating hours, shutdown is ordered for the active pump and
start-up of the other pump.
In case of thermal alarm on one of the pumps, the control must activate the second pump. On the
other hand, if both pumps are faulty, or if the only configured pump is faulty, the alarm stops the
unit.
If NO pumps are configured (PG09 = 0), as is the case with MOTOCONDENSING machines, the
entire pump management must be bypassed: compressors are immediately switched ON and the
unit is immediately switched OFF, i.e. without waiting for delay intervals. In addition to this,
thermal protection alarms are ignored.
6.9.1 Pump Status
To each pump, an operating status is associated, which is visible from the associated LED or in the
status template from the main menu. Each pump can take on the following statuses:
- Disabled: The pump has not been configured, the status display shows “dIS”.
- On: The status display shows “On”.
- Off: The status display shows “Off”.
- Alarm: The pump is in alarm status. The status display shows “ALAr”.
In the Maintenance Operator menu, via parameters PM31 and PM32, it is possible to read the
number of operating hours of the corresponding pumps. To zero these hours when required, it is
sufficient to enter a “0” value, using the ENTER key.
6.10 Internal Fan Management
On AIR-TO-AIR machines, the air-circulating fan is controlled, as an alternative to pump control;
in this case, the fan must be configured (PG09 = 1). The Pump operation PP01 parameter defines
how the pump is to operate.
6.10.1 Hot-start function
As an alternative to operation as defined by parameter PP01, start-up of the internal fan is provided
for only when the exchanger is hot, in order to avoid unpleasant shots of cold air; in this case, an
outlet temperature sensor checks that, with the compressor ON, air temperature is above the Hot-
start set point PP12. The fan remains activated until the compressor is switched OFF and until the
temperature falls below the set point by a Hot-start differential PP13.
Enabling of this function is done via parameter Hot-start enable PP11.