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3.4 Fan control
The influences of the fan control of the supply
and exhaust fans (both in automatic mode)
are also illustrated in the sample diagram.
3.4.1 Supply fan
The supply fan is switched on by the control,
as long as the steam bath temperature has
not reached the set value. It switches off at
(Temp._set value + supply fan 1_
∆
Temp.) In
the example:
Temperature set value:
45 °C
Supply fan 1_
∆
Temp.:
1K
•
The supply fan 1 switches off at
45 °C + 1K =
46 °C
•
Supply fan 1 switches back on again if
the temperature falls below the temper-
ature set value
If a second supply fan is used or if the supply
fan has a 2nd power level, both supply fans
are switched on until the temperature set
value is reached. Analogous to supply fan 1,
supply fan 2 is switched off when (Temp._set
value + supply fan 2_
∆
Temp.) is reached.
This mechanism is not illustrated in the sam-
ple diagram. Numerically, it could be repre-
sented as follows:
Temperature set value:
45 °C
Supply fan 1_
∆
Temp.:
2K
Supply fan 2_
∆
Temp.:
0.5 K
•
Supply fan 1 switches off at 45 °C + 2 K
=
47 °C
•
Supply fan 2 switches off at 45°C + 0.5
K =
45.5 °C
3.4.2 Exhaust fan
The exhaust fan is switched on if the temper-
ature set value is exceeded. The exhaust fan
switches off when the temperature falls below
(Temp._set value - exhaust fan 1_
∆
Temp.).
In the example:
Temperature set value:
45 °C
Exhaust fan 1_
∆
Temp.:
1K
•
The exhaust fan switches off at
45 °C - 1K =
44 °C
If a second exhaust fan is used or if the
exhaust fan has a 2nd power level, this addi-
tionally switches on if (set temperature value
+ exhaust fan 2_
∆
Temp.) has been reached.
This mechanism is not illustrated in the sam-
ple diagram. Numerically, it could be repre-
sented as follows:
Temperature set value:
45 °C
Exhaust fan 1_
∆
Temp.:
1K
Exhaust fan 2_
∆
Temp.:
0.5 K
•
Exhaust fan 1 switches on at
45 °C
•
Exhaust fan 2 additionally switches on
at
45.5 °C
•
Both exhaust fans switch off at
44 °C
Steam is only produced as long as the tem-
perature in the steam bath is below the set
temperature. If the temperature in the steam
bath remains above the set temperature for a
long time, i.e.
no visible steam
is produced,
the reason for this can be:
•
A high additional heat supply, e.g. due
to heated benches
•
Excessive insulation of steam bath
•
Insufficient ventilation in the steam bath
An exhaust fan promotes the air exchange in
the steam bath, leading to a faster tempera-
ture reduction in the steam bath. The temper-
ature drop is compensated by renewed
steam production. In this way, the fan
ensures that there is a steady, constant pro-
duction of steam and visible vapour in the
cabin a result.
