TECHNICAL MANUAL
Chapter 9 - User - Control Interface
NGSi 05÷15
20
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
In domestic hot water production the pump is forced to the maximum speed.
9.9 Heaters for antifreeze protection (if AK accessory is installed)
The antifreeze heaters on the faces of the evaporator plates come on even with the unit off (but powered up) when the output water
temperature drops below r02 °C (default 4°C) in “heat” mode or below r03 °C (default 4°C) in “cool” and “OFF” mode. The heaters are
switched off when the temperature reading of the output water probe exceeds r02+r06 in “heat” or r03+r06 in “cool” mode and in “OFF”
(default value r06=2.0°C). The heating cable on the base of the machine is activated, instead, when the outside air temperature drops below
3°C or the machine goes into defrost (after a set delay). It is disabled when the outdoor temperature exceeds 5°C.
9.10 Remote on-off and remote summer-winter switching
The terminal board has two digital inputs for operating the unit by means of a remote enabling signal.
9.11 Remote water temperature probe
In some system solutions (e.g. heat pump in parallel with the hot water tank on the same hydronic circuit and bypass diverter valve) it may
be necessary to remotely control the system temperature probe so that the controller installed on the unit can successfully process the system
management.
To configure the remote probe set H19=41 and H44=0 and connect the probe to the SE-SE terminals, or set H20=41 and H45=0 to use the
SAN-SAN terminals).
9.12 Domestic hot water production enable
To activate the domestic hot water function, connect a probe to be inserted in the tank to the SAN-SAN terminals (enabled as analogue
input). After fitting and connecting the temperature probe, the domestic hot water function has to be enabled by setting parameter H10 with
the value 1 and parameter H20 with the value 6 to enable the analogue input for the probe. These settings are accessed by entering the
maintenance password and accessing parameters PRG->PSS->PAr->Cnf->H10/H20 (modifications to be made by the installer).
If the domestic hot water temperature is below the relative setpoint (set at 48°C by default, which can be modified by accessing the PRG-
>Set->SAN menu) the unit activates the domestic hot water valve and the compressor switches to the minimum frequency for a time of 2
minutes, giving the valve time to divert the flow of water to the domestic hot water tank. After the switching time, the compressor is set at
the maximum frequency starting the modulation at one degree before the setpoint and switching off one degree after. Once the setpoint is
reached, the valve returns to the rest position and compressor operation is controlled in the usual way.
If a 3-way switching valve with 3-point power supply is used, it must be connected to terminals NO1, N and NC1.
If a 3-way switching valve with 2-point power supply (with return spring) is used, it must be connected to terminals NO1 and N.
Contact NO1 closed means that the valve is excited and is diverting the flow of water to the domestic hot water tank.
Contact NO1 open means that the valve is not excited and is diverting the flow of water to the user.
SW-SW:
Input for remote summer/winter mode switching.
To enable this function, set parameter H76 with the value 1.
The parameter is protected by a password (it can only be modified by the installer).
With open contact the machine is in “heat” mode, with closed contact the machine switches to “cool” mode.
onoff-onoff:
Remote on-off input.
This function is already enabled by default.
Remove the jumper from the terminal board to set the unit in standby status (in this status the display of control
installed on the unit shows “E00”).
When the contact closes, the machine comes out of the standby mode and the circulator is turned on for 2 minutes.
If the domestic hot water operation is enabled, the remote on-off function has no effect on the production of ACS,
it disables only the operation in heating and chiller mode on the system side (in this status the display installed on
the unit shows “SAN”).
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