7:8 (24), 0-004-7614-0 (GB) TAC AB, 1998-10-23
TAC 2413 Handbook Functional description
If the mixed air damper has been chosen, 100 % return air applies
during night heating operation. If heat recovery is chosen, there
is normal operation. In both cases, the normal setpoints apply.
P No. Parameter Min. Max. Factory set. Change Comment
P 25 Night heating setpoint 0 °C 50 °C 16 °C
P 91 FF stop during night heating 0 1=TF in operation only
7.3.5 Night cooling
The cooling demand which exists during the summer period in or-
der to keep the right temperature will result in high operating
costs. For this reason, TAC 2413 makes use of the relatively cold
night air to cool the building down as well. The consequences are
that less cool air, if any, needs to be supplied on the following
day, and in all, the energy consumption has been decreased.
Night cooling is activated automatically if a room sensor is instal-
led on the condition that there is an outdoor temperature sensor.
This applies even if supply air control is chosen.
To achieve the maximum efficiency, night cooling will not start
before a number of conditions are valid, see below:
1. The date falls within the summer period.
2. The remaining time to the next normal operation cycle is less
than the set time; factory setting
: 10 hours. 0 will disable this.
3. The outdoor temperature is higher than “Min. outdoor temp for
night cooling”.
4. The difference between the room and outdoor temperature is >5
°C.
5. The room temperature is >1.0 °C above “Night cooling setpoint”.
Night cooling is stopped when the room temperature has dropped
to the “Night cooling setpoint”.
When the night cooling is active, the heat exchanger and heating coil
are disabled during an adjustable time of th next normal operation pe-
riod in order to prevent heating of the building.
P No. Parameter Min. Max. Factory set. Change Comment
P 22 Night cooling (status) (0/1)
P 24 Night cooling setpoint 0 °C 50 °C 19 °C
P 43 Min. outdoor temperature 0 °C 50 °C 12 °C
for night cooling
P 44 Maximum time to next 0 h 20 h 10 h
normal operation period
P 45 Disabling of Y1, Y2 0 min 300 min 180 min
after night cooling
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