1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 36 of 149
2. Push
SET
key: the
o
label and the configuration number are blinking, use the
UP
or
DOWN
key and
select the proper polarity
( o / c )
of the function, then push
SET
key to confirm it all.
3. The top display blinks for some seconds and then it will shows the next parameter.
4. To exit the programming push
SET + UP
together or wait the timeout (15seconds).
10. CHILLER / HEAT PUMP SELECTION
Select the Chiller or the Heat pump mode
The CF79 parameter allows to select and enable the running mode:
Par. CF79 = 0: Through keyboard
The user can start and stop the unit using the keys of the front panel.
Par. CF79 = 1:
Through digital input programmed to start/stop the unit from remote control.
This selection is enabled if there is one digital input configured as start/stop from remote (remote chiller /
heat pump). I non of the digital input are configure the unit remains in
stand–by
.
The “open” status of the input forces the chiller running mode.
The “closed” status of the input forces the heat pump running mode.
The keyboard selection is disabled.
The key on the front panel can start/stop the unit only with the digital input selection
Par. CF79 =2:
Automatic selection of the Chiller - Heat Pump through analogue input
The analogue input selection or change over function overrides the digital input C-HP function. If the external
air temperature are within the CF81 differential, the user can change the running mode from the keyboard.
If the unit is running with CF79 = 1 or CF79=2, and it is requested a running mode change, the controller
turns off all the outputs, starts a fixed delay time signalled by the chiller or heat pump blinking led. This
blinking led indicates which running mode will be activated after the compressor delay time protection.
Change Over
To change the running status the following condition must be respected otherwise the unit remains in
stand -
by:
1. CF02=3 (heat pump selected)
2. CF79=2 and a NTC probe configured as NTC external air temperature for dynamic setpoint/ boiler /
change over
3. This probe is working properly
Parameters involved with the change over function:
CF80 Change over Setpoint
. If the analogue input control (from probe) function is enabled, it represents the
limit temperature of the probe value under which the unit runs the Heat Pump mode.
CF81 Change over Differential
. If the analogue input control (from probe) function is enabled, it represents
the limit differential temperature of the probe value to restart in the Chiller mode.
For external air temperature within CF81 the user can manually change the status from keyboard.
GRAPH: AUTOMATIC CHANGE OVER
Keyboard selection
CF78
= 0:
pushing
key the unit starts in chiller, pushing
key the unit starts in heat pump
CF78
= 1:
pushing
key the unit starts in heat pump, pushing
key the unit starts in chiller
