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timer based control logic (VK U1): to maintain air temperature with high accuracy. The fan changes its
speed more often as compared to the previous control logic, but the minimum operating time at one speed
is not less than 5 minutes. As air temperature rises up to the set point, the fan switches to maximum speed.
Synchronously, the speed switch delay timer is activated for 5 minutes. As air temperature drops down
below the set point, but only after 5 minutes countdown after switching to high speed, the fan switches to
lower set speed.
If the initial temperature is below the set temperature point, the fan operates at low set speed from the start.
The fan VK P (fig. 12) is equipped with a speed controller that enables switching the fan on/off, smooth
speed (air flow) control from minimum to maximum value.
MOUNTING
The fan is designed for both horizontal and top installation and may be mounted on the floor or attached to
the wall or to the ceiling, fig. 2. While mounting the fan provide extra protection against water ingress.
The protection examples are shown in fig. 2:
1. For the top mounting position: install a protecting hood above.
2. For any mounting position: connect a straight air duct section at least 1 m long on both sides of the fan.
The fan mounting sequence is shown in fig. 3 8.
The fan wiring diagrams are shown in fig. 9.
Wiring diagram designations:
L minimum speed terminal;
QF automatic circuit breaker;
S external switch , i.e., light switch;
X input terminal.
Automatic circuit
breaker designation
QF
External switch
designation
S
5
EN
Automatic
circuit breaker
External
switch
1
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