TAC 2413 - Cooling Recovery

TAC AB, 1998-10-23 0-004-7614-0 (GB), 7:17 (24)
TAC 2413 Handbook Functional description
The negative hysteresis may not be greater than the difference bet-
ween the heating and cooling setpoints, however. In this way, one DX
step may be controlled via K5, or several DX steps may be controlled
by using a 2–10 V signal with a voltage relay such as RY.
The supply air sensor has no controlling function apart from disabling
the DX cooling, if the supply air temperature drops below the set
minimum temperature.
If the supply air temperature becomes too low, the control signal of
the controller is stopped for five minutes; then, it is decreased. After a
decrease of 20 %, the DX step K5 is disabled, and the control signal
continues to decrease. When the supply air temperature is 1 °C above
the set minimum temperature, the control cycle is allowed to start
again.
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
7.3.13 Cooling recovery
TAC 2413 is able to make use of possible cooling content in the return
air in order to decrease the energy consumption during cooling.
When the return air temperature during cooling is lower than the out-
door temperature, and the difference exceeds the “economy limit”, an
economy function is started, which has the effect that the recovery
HEX is running in maximum cooling recovery mode. Alternately, the
damper assumes its minimum outdoor air positions, and the cooling
continues.
The cooling recovery ends when the outdoor temperature is less than
the return air temperature. If any sensor is not installed, the function
will not be available, and the parameter will not appear.
P No. Parameter Min. Max. Factory set. Change Comment
P 05 Return air temperature Measured value
P 37 Economy limit outdoor– 0 °C 50 °C 2 °C Difference for activating
return air the cooling recovery