AERMEC HMI-1 User Manual Download Page 21

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Thermostat

Thermostat setting

Thermostat status

Priority

Control panel

Main unit

Without

Off

Air conditioning

Heating

On for heating

Cooling

On for cooling

Off

Last operation mode

Off

Air+ hot water

Heating

ACS

DHW + Heating

First water heating and then heating

Heat/Cool

H DHW

On for heating; water heated by the water heater electric heater

Cooling

ACS

Hot water + cooling

First water heating and then cooling

C hot water

On for cooling; water heated by the water heater electric heater

Off

ACS

On for water heating

Air+ hot water2

Heating

On for heating

Cooling

On for cooling

Hot domestic water

ACS

On for water heating

H DHW

ACS

DHW + Heating

First water heating and then heating

Heat/Cool

H DHW

On for heating; water heated by the water heater electric heater

C hot water

ACS

Hot water + cooling

First water heating and then cooling

Heat/Cool

C hot water

On for cooling; water heated by the water heater electric heater

Off

Last operation mode

Off

6.7 SETTING AN ADDITIONAL HEAT SOURCE (OTHER

THERMAL)

At the commissioning parameter setting page, by touching “Other thermal”, the
control panel will access to the corresponding setting page.

Other thermal

Other thermal: With

T Other switch on: -20°C

Logic: 1

After accessing the "Additional heat source" function, you can activate or deactivate
the substitute heat source and set the outdoor temperature threshold below which
it will be activated in place of the heat pump; you can also define the logic for man-
aging the substitution. The available logic items are:

Logic 1

With this logic, the 2-way valve is managed on the basis of the control panel set-
tings; the operating modes will therefore be managed when the temperature
measured by the outside air probe is lower than the "Additional heat source temp."
parameter:
—

Heating

: the unit (and its circulator) will not be active, the 3-way valve will be

blocked on the system side, and the additional heat source will be activated;
once the set value has been reached, the additional heat source will be deacti-
vated and the unit will activate its circulator.

—

DHW

: the unit (and its circulator) will not be active, the 3-way valve will be

blocked on the DHW side, and the additional heat source will be activated.

—

H DHW

: the unit (and its circulator) will not be active, the 3-way valve

will be blocked on the system side, and the additional heat source will be acti-
vated; once the set value has been reached, the additional heat source will be
deactivated and the unit will activate its circulator; the DHW side will be man-
aged using only the electric heaters of the compatible Aermec accessory tank.

Logic 2

Heating

: the unit (and its circulator) will not be active, the 3-way valve will be

blocked on the system side, and the additional heat source will be activated;

once the set value has been reached, the additional heat source will be deacti-
vated and the unit will activate its circulator.

—

DHW

: the unit (and its circulator) will not be active, the 3-way valve will be

blocked on the DHW side, and the additional heat source will be activated.

—

H DHW

If the priority is "Heating" (paragraph "4.4 H DHW p. 10"), the unit
(and its circulator) will not be active, the 3-way valve will be blocked on the sys-
tem side, and the additional heat source will be activated; once the set value
has been reached, the additional heat source will be deactivated and the unit
will activate its circulator; the DHW side will be managed using only the electric
heaters of the compatible Aermec accessory tank;

If the priority is "DHW" (paragraph "4.4 H DHW p. 10"), the unit (and
its circulator) will not be active, the 3-way valve will be blocked on the DHW
side, and the additional heat source will be activated; once the set value has
been reached on the DHW side, the 3-way valve will be moved to the system
side and the additional heat source will work for heating;

Logic 3

This logic disables the heat pump and activates a 230V signal to the “Other thermal”
terminals (refer to the installation manual for more information); this signal acti-
vates the additional heat source when the temperature measured by the outside air
probe is lower than the "Additional heat source temp." parameter (which will work
in stand alone mode compared with the unit).
Lastly, press the top right button to save the data entered.

Note:

When this function is activated, it permits the activation of the replacement
heat source (via a 230V ~ 50Hz signal to the "Other thermal" terminals) if the
outside temperature falls below the value specified in the “Additional heat
source temp.“ parameter or if “Emergency mode” is activated;

If you select “Logic 1” or “Logic 2“, the additional heat source must be set so as
to produce hot water with a set-point equal to that selected for the heat pump.
This setting must be made manually by the user, as the heat pump gives con-
sent only (without the possibility to alter the hot water production set-point on
the additional heat source);

If you select “Logic 2”, the system must be designed to supply the system ter-
minal side and the DHW side with water at the same temperature (so the sys-
tem-side terminals must necessarily be fitted with mixer valves to ensure the
hot inlet water is correctly managed);

The supplementary water probe must be installed downstream of the 3-way
valve (for more information, refer to the installation manual);

If this function is used, no additional electric heaters can be enabled (optional
elec. heater);

If the relative function is activated (paragraph "8.1 Activating/deactivating
the memory (On/off memory) p. 32"), the value of these parameters will
be stored in the memory and automatically reset after any possible voltage
failure;

The heat pump will only send a signal to other thermal, but all the logic of control
must be “stand alone”.

Other thermal

Number

Mode

Note

Required accessories

Logic 1

Heating

Available

RT5 temperature sensor

ACS

Available