8
VPA provides controlling the air ow rate, air temperature (preheating) and to lter it as
well. VPA exterior view is shown in g. 2.
Inside the case 1 there is installed the centrifugal-axial fan 2 equipped with the motor
with external rotor and integrated thermal protection. The motor is inside the operating
turbine and doesn΄t require any maintenance. The air ow rate is controlled by means of
the fan 2 speed switch with 3 speed steps. The air lter 3 of EU4 ltration class per DIN
24185 is located in the case 1 guiding rails from the fan 2 tube. For air preheating, the
electric heater 4 with circular tube is mounted from the pressure tube.
The electric heater 4 has the thermal protection against the overheating: safety device
with automatic restart of VPA and emergency shuto with manual recovery:
50° thermostat for VPA automatic switching-o and consequent switching-on after the
heater housing has cooled.
90° thermal switch with automatic restart of VPA using manual recovery
Sensors of the emergency thermal switch shuto circuits and don›t return VPA to
operating condition. To recover VPA it is necessary to push the manual restart «RESET»
button.
Standard set has the remote control panel 5 connected by the communication cable 6to
control system located inside the control unit 7. The lter contamination is monitored by
pressure drop dierential sensor 8. The lter replacement frequency is set on control panel.
the emergency alarm is generated by LED indicator 9 located on the control panel 5.
To monitor and maintain the temperature in the channel, VPA is equipped with channel
temperature sensor. To disconnect VPA from the electric network the power switch is
located on the control unit. VPA is connected to standard circular channels of the air
network.
Special function: to control the fan capacity and the heater operation and to monitor
the lter contamination.
The hinged (pos. 10) or removable cover uses the place for mounting VPA in optimal
manner.
DESIGN AND OPERATION PRINCIPLE
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