TAC 2413 - Page 45

TAC AB, 1998-10-23 0-004-7614-0 (GB), 7:13 (24)
TAC 2413 Handbook Functional description
P No. Parameter Min. Max. Factory set. Change Comment
P 06 Return temp., heating coil Measured value
P 19 Output signal, heating valve
P 26 Min. supply air temp. 0 °C 50 °C 14 °C
setpoint, heating control
P 28 Max. supply air temp. SP 0 °C 50 °C 35 °C
P 29 Frost protection setpoint 4 °C 50 °C 8 °C
P 34 Heating valve opening at 0 % 100 % 50%
start, –10 °C
P 60 P band supply air controller 1 °C 100 °C 25 °C (0,5x at 1/1 speed)
during heating control
P 61 I time supply air controller 1 min 20 min 4 min
during heating control
P 62 Return limitation controller 0 °C 50 °C 12 °C
setpoint for heating coil
P 63 P band of the return 1 °C 100 °C 25 °C
limitation controller
P 64 I time of the return 1 min 20 min 4 min
limitation controller
P 65 Holding controller setpoint 0 °C 50 °C 25 °C
for heating coil
P 66 P band, holding controller 1 °C 400 °C 200 °C
P 67 I time, holding controller 1 min 20 min 4 min
Pump control, P
V
When the outdoor temperature is below the “Outdoor temperature li-
mit” (factory set to 17 °C), the circulation pump of the heating coil
runs continuously. The pump is stopped with a five minute delay
when the temperature is above the “Outdoor temperature limit” and
the summer period applies. If the pump control is on at the same time
as the pump indication is off, the pump alarm is tripped.
Restarting the pump
There is a fixed hysteresis of 1,5°C which acts to prevent unnecessary
starting and stopping of the pump during stops when the outdoor tem-
perature is close to its limit, see the figure below.
The circulation pump is restarted when the temperature is 1,5 °C
below the “Outdoor temperature limit”, which is equal to the
hysteresis.
17 °C outdoor temperature
1,5 °C hysteresis
function
off
on