8
Automated VPA
VPA
provides controlling the air flow rate, air temperature (preheating) and to filter it as
well. VPA exterior view is shown in fig. 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 flow rate is controlled by means of
the fan 2 speed switch with 3 speed steps. The air filter 3 of EU4 filtration 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 shutoff with manual recovery:
50° thermostat for VPA automatic switching-off 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 shutoff 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 6 to
control system located inside the control unit 7. The filter contamination is monitored by
pressure drop differential sensor 8. The filter 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 filter 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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