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IV.12. Night Cooling
This function is used in summer to cool building interiors at night using outside air. This helps reduce the quantity of cold
air required during the daytime. The Night Cooling function only operates from 00:00 to 07:00. During Night Cooling, the
hot and cold outputs are locked to 0 V. The heat exchanger delivers exclusively fresh air. On termination of the Night
Cooling stage, the heating is locked to 0V for 60 minutes.
Conditions of operation : definable parameters in section V.5.b.2
• The external temperature exceeds 22° C during daytime
• The timers are set to PV and for shutdown between 00:00 and 07:00.
• The external temperature is below 18° C during Night Cooling operation
• The external temperature exceeds 10° C during Night Cooling operation
• The ambient room temperature exceeds 18° C
During Night Cooling, the fans run at 85% of full speed. This speed is settable (see section V.5.b.2).
For LOBBY versions, a 24 V output (to be connected by relay) is available across terminals 22 and DO7 to force opening
of the area dampers during Night Cooling.
IV.13. Changeover coil
For PREMIUM BC and INFINITE BC systems. Provision must be made for collection of condensate via a siphon.
Be careful not to impede opening of the access doors (with pipes, cables, etc.)
The coil is already installed in the system, the antifreeze thermostat is connected. The 3-way valve must be connected
electrically. If a cooling or changeover battery is used in the duct, move the supply sensor downstream of the coil.
THE VALVE MUST ONLY BE CONNECTED WHEN THE ELECTRICAL CIRCUIT IS POWERED OFF
Connect the servomotor of the 3-way valve as follows :
Heater battery :
Terminal
15
to +24 V (G) of the valve servomotor
Terminal
16
to 0 V (G0) of the valve servomotor
Terminal
17
to +10 V (Y) of the valve servomotor
Connect the NF contact (C and 2) of the
THA
(antifreeze thermostat ) to
5
and
6
.
Possibility to connect the hot water pump to the system at the terminals DO3 of the controller and connection terminal
18. (Caution: the 24 V output is to be connected via a relay)
Cooling coil :
Terminal
28
to +24 V (G) of the valve servomotor
Terminal 29 to 0 V (G0) of the valve servomotor
Terminal 30 to +10 V (Y) of the valve servomotor
Connect the NF contact (C and 2) of the
THA
(antifreeze thermostat ) to
5
and
6
.
Possibility to connect the cold water pump to the system at the terminals
DO4 of the controller and connection
terminal 19
. (Caution: the 24 V output is to be connected via a relay)
Changeover coil :
The 3-way plate must be fixed at the water inlet before the bypass.
The 3-way valve and the changeover plate must wired up.
Connect the assembly as follows :
Red wire of the plate (CO) to 10 V (Y) of the valve servomotor
COILS
ENGLISH
