16
— DIP3 ON and DIP4 ON → internal coil for heating and external coil for cooling (the water probe must be placed in the internal coil piping and will perform the sole function
of controlling the minimum water temperature)
— DIP3 ON and DIP4 OFF → internal coil for heating and cooling (the water probe must be placed in the internal coil piping and will perform the function of controlling the
minimum and maximum water temperature).
The regulator tries to introduce “neutral air” into the room, keeping the TSAM value close to the TSA value in both seasons of functioning. Even with the use of post-treatment
coil, the condition of “neutral air input” must be observed. The recovery unit must only be used to treat the air (exchange) and not for cooling the rooms.
The activation of the coil valve follows the logic described in the previous figure.
t
SA
t
SAM
0.5 °C
t
SA
t
SAM
t
SA
t
SAM
t
SA
t
SAM
0.5 °C
T
SA
< T
SET
T
SA
> T
SET
ON
ON
OFF
OFF
OFF
control logic of the post treatment coil valve
To avoid using the post-treatment coil inefficiently, especially during winter functioning, the recovery unit controls the temperature of the water upstream of the valve accord-
ing to the logic described in the previous figure.
22°C
17°C
35°C
31°C
t
SW
°C
Enable to
run hot
Post treatment
coil disabled
Enabled to
run cold
Regulating logic of the post treatment coil valve
During winter functioning, the system provides for an anti-freeze control of the post-treatment coil in relation to the temperature detected by the SAM probe:
tSAM < 5 °C → recovery unit ventilation block for 10 minutes.
t [min]
t
SAM
5 °C
stop ventilation
for 10 minutes
stop ventilation for
10 minutes
ventilation cycles in anti-freeze conditions
