On/Off Hysteresis Of The Supply And The Exhaust Fan (2-Fan Operation) - Nordmann AT4 D Service Manual

4.3

On/Off hysteresis of the supply and the exhaust fan (2-fan operation)

Supply Exhaust
Air Air
-5 5
-4 4
-3 3
-2 2
-1 1
0 0
1 -1
2 -2
3 -3
4 -4
5 -5
Example with setpoint value 40°C:
Hysteresis Exhaust fan 4°C: The exhaust fan switches off if the temperature is 2 °C below the setpoint value and
switches on if the temperature is 2 °C above the setpoint value.
Hysteresis supply fan 2 °C: The supply fan switches off if the temperature is 1 °C below the setpoint value and switches
on if the temperature is 1 °C above the setpoint value.
In order to achieve an optimum steam formation in the steam
bath cabin when operating the Nodmann AT4 D with a supply
and a exhaust fan (2-fan mode) the ON and Off switching points
can be indiviually set with the hysteresis value in °C (steam bath
operation) or %rh (caldarium operation). The fans are switched off
when the temperature/humidity drops below the septpoint value
by the half of the set hysteresis value and are switched on when
the temperature/humidity exceeds the setpoint value by the half
of the set hysteresis value.
6
5
Setpoint 4
3
2
1
0
-1
40 °C
-2
-3
-4
-5
-6
Note: If the supply fan is controlled with the "RLS" option de-
pendent on the heating voltage (supply fan is running, when the
heating voltage contactor is switched on) all software settings
of the supply fan are without function.
35 36 37 38 39
Actual temperature in °C
Exhaust Air
Supply Air
On
Off
40 41 42 43 44 45
27