TAC 2413 - Page 47

TAC AB, 1998-10-23 0-004-7614-0 (GB), 7:15 (24)
TAC 2413 Handbook Functional description
The controller will return to heating control only when the supply air
or room temperature has dropped to the “Heating setpoint”. The con-
trol principle for both heating and cooling is to provide the highest
possible comfort using the least possible energy by using advanced
technology.
Since there is a neutral zone between the heating and cooling set-
points, the heating/cooling will apply only when there is a real
need for control, and the risk of overlapping is eliminated as well.
The neutral zone is the difference between the cooling and hea-
ting setpoints, and it cannot be less than 0,5 °C, even if the coo-
ling setpoint (P 11) is set below the heating setpoint (P 10).
If the temperature lies within the neutral zone, neither the heating nor
the cooling coil is active, see the figure above.
Pump control, P
K
The circulation pump of the cooling coil runs continuously when
cooling control applies. Otherwise, it is off, but it is exercised once a
day at 12:00 noon–12:01.
P No. Parameter Min. Max. Factory set.Change Comment
P 10 Heating setpoint 0 °C 50 °C 20 °C
P 11 Cooling setpoint 0 °C 50 °C 22 °C
P 27 Min. supply air setpoint, 0 °C 50 °C 12 °C
cooling control
P 47 Start month of 1 12 5
summer period
P 48 Start month of 1 13 10
winter period
P 68 P band, supply air controller 1 °C 100 °C 25 °C
during cooling control
P 69 I time, supply air controller 1 min 20 min 4 min
during cooling control
room or supply air
temperature
heating
setpoint
cooling
setpoint
cooling
heating
function
load
neutral zone