EVCO c-pro nano HPR0 - Manual (Page 24)

C-PRO NANO HPR0 APPLICATION MANUAL
Page 24
5.7 Management of the geothermic circulation pumps and
heating/cooling
The application can manage the unit and system pumps. A safety digital input and a digital output
for switch-on/off can be associated at every use.
5.8 Pump status
The pumps are each controlled by a dedicated digital output (see I/O table).
Functioning takes place on call of the ON-OFF thermostats (EXT and/or INT) and/or outlet
temperature. The pump is activated as a consequence of the room thermostat request, with switch-
on/off delay times (that can be set) indicated on the functioning (flow) lay outs.
A functioning state is associated to the pumps in the states mask from the main menu. For example,
the pumps assume the following states:
- On: “On” appears on the state mask
- Switch-on stand-by: they are in stand-by for the switch-on protection times. “tOn” appears
on the state mask
- Off: “OFF” appears on the state mask
- Alarm: following the intervention of the flow switch, “ALAr” appears on the state mask.
5.9 Pump protection times
These times are used to ensure the correct sequence and priority in switch-on or switch-off. The
controller manages a unique safety device (flow switch) for each pump.
The relative insertion or alarm delay times can be enabled and set by the specific parameters. The
settings are unique for the two pumps in this application.
The compressor switches off in the same way as the thermostat switch-off request, while the pump
remains on for a time period that ca be set.
In the event of breakdown (Flow switch Alarm) of one of the two pumps, the compressors and
pumps are switched-off
Minimum time between unit switch-off and pumps switch-off. Once the unit is switched-off, the
pumps will remain on for this period of time before switching-off. (parameter PP05)
Pumps activation delay. Once the unit is switched-on and has the consents necessary for pumps
switch-on (see diagram), the pumps will switch-on after this period of time (parameter PP06)
Pumps switch-off delay. If the consent is lost for maintaining the ON mode of the pumps (see
diagram), the pumps will switch-off after this period of time (winter mode) (parameter PP07)
Pumps switch-off delay. If the consent is lost for maintaining the ON mode of the pumps (see
diagram), the pumps will switch-off after this period of time (summer mode) (parameter PP08)