Vortice VORT NRG EC 3000 Operating And Commissioning Instructions Download Page 20

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VI.9 NIGHT COOLING

This function is used during summer to cool buildings at night by using cool outdoor air, thus reducing the cooling power to be delivered
during the day. The NIGHT COOLING function works only between midnight and 7 a.m..

During the Night Cooling period, the heating and cooling outlets are blocked. The bypass is also open to prevent air from

travelling through the exchanger. At the end of a NIGHT COOLING period, the heating is blocked for 60 minutes.

Operating conditions:
• The outdoor temperature was greater than 22°C during the day.
• The clocks are set either to LS or to stop between midnight and 7 a.m..
• The outdoor temperature is less than 18°C during the NIGHT COOLING period.
• The outdoor temperature is greater than 10°C during the NIGHT COOLING period.
• The room temperature is greater than 18°C.

During the NIGHT COOLING period, the fan runs at 85% capacity. This speed can be adjusted. See section VII.3.7

For the LOBBY version, a maximum 24 V 2A output is provided between the DO7 and 2 terminals to force the opening
of the dampers during the Night Cooling period.

VI.10 Automatic defrost

This function is automatically controlled using the CORRIGO regulator’s programming and the probes installed as
standard in our double-flow VORT NRG EC units. Defrosting starts with the opening of the bypass (defrost temperature,
SDG, less

than 5°C). If the bypass function is not adequate to defrost the exchanger (normally if the outside temperature is less than
-10°C), the new air fan modulates its airflow until it stops, and then restarts as soon as the defrost temperature probe
exceeds 5°C.

For the INFINITE and EH versions:

a defrost coil is installed on the new air duct, to minimise the risk of frost with the

bypass closed. The maximum efficiency of the system is thus maintained.

VI.11 Hot water and cold water coil (the valve must be connected in the OFF position)

On the

VORT PREMIUM BC

and

VORT INFINITE BC

versions, the hot water coil is already installed in the unit. The anti-

frost thermostat is connected. However, you should wire the 3-way valve.

For all other versions, also connect the THA (anti-frost thermostat) and shift the supply air probe after the battery

Connect the 3-way valve’s servomotor as follows:

Hot coil:

Terminal

of the VORT NRG EC unit to the +24 V (G) of the valve’s servomotor

Terminal

of the VORT NRG EC unit to the +0 V (G0) of the valve’s servomotor

Terminal

of the VORT NRG EC unit to the +10 V (Y) of the valve’s servomotor

Connect the NC contact (C and 2) of the

THA

(anti-frost thermostat) to 18 and 19

Cold coil:

Terminal

of the VORT NRG EC unit to the +24 V (G) of the valve’s servomotor

Terminal

of the VORT NRG EC unit to the +0 V (G0) of the valve’s servomotor

Terminal

of the VORT NRG EC unit to the +10 V (Y) of the valve’s servomotor

Connect the NC contact (C and 2) of the

THA

(anti-frost thermostat) to 18 and 19

VI.12 Changeover coil (EC FIRST versions only) (the valve
must be connected in the OFF position)

A changeover coil can be installed on the

VORT NRG EC FIRST version.

this case you will not be able to add another hot water or cold water coil. You should connect the 3-way valve, the
changeover handle and the THA (anti-frost thermostat), and shift the supply air
probe after the coil

Connect the appliance as described below:
Red wire of the handle (CO) to Y of the valve’s servomotor
Terminal

of the NRG EC unit to the +24 V (G) of the valve’s servomotor

Terminal

of the NRG EC unit to the +0 V (G0) of the valve’s servomotor

Terminal

of the NRG EC unit to the brown wire of the handle at the hot signal

Terminal

of the NRG EC unit to the black wire of the handle at the cold signal

Connect the NC contact (C and 2) of the

THA

(anti-frost thermostat) to 18 and 19

ENGLISH