Function
Parameter Description
Value range
Default
value
Set
value
Min
Max
External heat source
air temperature limit
148
This code is used to set the outside air temperature threshold value below which only
the external heat source will be operative as per algorithm. (Heat Pump Stop)
-20°C 65°C
-20°C
Temperature list
149
Code used to set which temperature the control panel should display in the temperature
zone.
1. Indoor air temperature
2. Outlet water temperature (from LWT sensor)
3. N.A.
4. Refrigerant temperature (from TR sensor)
5. Suction temperature (from TS sensor)
6. Discharge temperature (from TD sensor)
7. Refrigerant temperature (from TE sensor)
1
7
1
Auxiliary outdoor air
temperature limit
150
This code is used to set the outside air temperature threshold value below which both
the heat pump and the external heat source will be operative as per algorithm.
-20°C 30°C
0°C
Auxiliary delay
151
This code is used to set the delay time after which, when (temperature set in code 148)
< Outside Air Temperature < (temperature set in code 150), the external heat source
will switch on.
The counting of the time starts when the activation of the external heat source is
required as per algorithm.
1 Min 60 Min
10 Min
Auxiliary hysteresis
152
This code is used to set the hysteresis temperature needed to activate the external
heat source.
1°C
20°C
5°C
Domestic hot water in
off mode
153
Code to establish whether, when the system is in off mode, the domestic hot water
production logic can be activated:
1. Yes, the domestic hot water logic is always active
2. No, the domestic hot water logic can be activated only in Heating or Cooling mode
1
2
1
Status of external
heat source
154
Code used to establish the status of the external heat source when this later is activated
and the outside air temperature is below the temperature value set with parameter 148:
0. Always active
1. On/Off depending by actual room temperature vs room temperature set-point (same
hysteresis of the thermostat function). If the command is not installed or the room
sensor is unavailable, On/Off depends on the water set-point (+1/-4 °C of hysteresis)
2. On/Off depending on the water set-point (+1/-4 °C of hysteresis).
0
2
1
Main water pump vs
external heat source
status
155
This code is used to define the water pump logic when the external heat source is
activated and the outside air temperature < temperature value set in Code 148
0. Always off
1. On/Off depending on the On/Off status of the external heat source
2. Always on
0
2
1
Electric trace heater/
additional water pump
156
Code used to select the output connected to PIN 12 on the terminal board. In case an
additional water pump option is active, this code is used to select its operating system with
respect to the domestic hot water request (ACS) (if outside air temperature > (temperature
value set with Code 148).
0. Electric heat tracing installed for the antifreeze system
1. Additional water pump On/Off depending on the main water pump logic. This means that if the
DHW is on, the additional water pump is ON.
2. Additional water pump On/Off depending on the main water pump logic, but always OFF when
the DHW is on.
0
2
1
Additional water
pump
157
This code is used to establish the additional water pump, if it has been installed, when
the outside air temperature < temperature value set with Code 148:
0. Always off
1. On/Off depending on the On/Off status of the external heat source
2. Always on
0
2
2
Delta air set point
158
Code used to establish the hysteresis with respect to the ambient temperature set point
to switch off the unit when control panel system is installed and used as a thermostat
(100 control panel code = 4).
0.2°C
1°C
0.3 °C
Function
Parameter Description
Value range
Default
value
Set
value
Min
Max
Unit configuration
302
This code is used to configure the unit:
0. Cooling only
1. Heating and cooling
2. Heating only
0
2
1
Table of factory parameters and functions
36
