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Monobloc Outdoor Unit Installation Manual
7.8.10 External electrical connections – digital inputs (5V)
Function Switch No
DI Open
DI Short
DI#01
SW1
Operation OFF
Operation ON
DI#02
SW2
COOL mode active
HEAT mode active
DI#03
SW3
Comfort mode active
ECO mode active
DI#04 *
SW4
Safety Input ON
Safety Input OFF
DI#05
SW5
User defined function
DI#06
SW6
User defined function
DI#07
SW7
User defined function
DI#08
SW8
User defined function
DI#09
FS
No water flow detected
Water flow detected
* DI#04 is a normally closed contact, a wire bridge is provided from the factory between T7 & T13
Some modes described below (summer mode / night mode…) could be activated or deactivated by switches.
Moreover other remote contacts can be connected to the unit in order to add new features. If the unit is managed
by remote contacts, it is necessary to change the value of parameter User Interface type with [P521] = 1.
Switch
Definition
ON/OFF switch (remote)
Used to START / STOP the unit (in no user interface)
Mode Heat/Cool (remote)
Used to select (if no user interface):
- Cooling Mode = contact opened
- Heating Mode = contact closed
Normal/Eco (remote)
Used to select (if no user interface):
- Home (Normal) Mode = contact opened
- Away (Eco) Mode = contact closed
Safety Input Contact
This contact should be a ‘normally closed’ type.
Parameter [P501] is used to configure the safety contact type:
1 = Full Safety Contact: unit is stopped when contact is opened
2 = Under Floor Heating Safety Contact: Heating Mode is not allowed when contact is opened
3 = Under Floor Cooling Safety Contact: Cooling Mode is not allowed when contact is opened
Power Limitation Contact (Night Mode) Used to reduce the compressor maximum frequency to avoid noise
Off Peak Contact
This switch is to close when the rate electricity price is high (Electric Heat Stages are not allowed)
Loadshed Request Switch
This contact is requested by electricity company (i.e. in Germany) to control the green electricity (wind, solar)
production and consumption more efficiently. When the switch is closed the unit shall be stopped as soon as
possible
Solar Input Contact
When switch is closed then the unit is not allowed to run in Heating or DHW Mode because hot water is produced
from a solar source
DHW Request Switch from tank
When this input is closed, the Domestic Hot Water production is requested. A thermal switch mounted on the
Domestic Hot Water tank shall be connected to this input
DHW Priority
Button
(thermal switch)
When the status of this input is pulsed open > closed > open (falling edge), the unit is switched to Domestic Hot
Water production for the programmed duration [P115] regardless of the Space Heating demand and the current
DHW schedule
Anti-Legionella Cycle Request Button
When the status of this input is pulsed open > closed > open (falling edge), the Domestic Hot Water production is
requested with the Anti-Legionella setpoint
Summer Switch
Used to select the Summer Mode (contact closed)
Energy Meter Input
This input is used to count the number of pulses received from an external energy meter (not supplied)
External Alarm Indication Input
When this input is opened, alarm is tripped. This alarm is for information only, it does not affect the unit operation.
Dry contact
5V
Off/On Switch (remote)
Mode Cool/Heat (remote)
Comfort/Eco (remote)
Safety Input Switch
Flow Switch (standard)
Customized
Customized
Customized
Customized
Ground
sw1
sw2
sw3
sw4
FS
sw5
sw6
sw7
sw8
