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6.7 Pressure transducer
6.7.1
Pressure transducer for constant pressure control
Installation of the pressure transducer helps modulate the fan speed to guarantee a desired pressure difference
between two different points in the plant, for instance between the return and the delivery lines of the unit or between
the delivery line and the outside.
For correct pressure measurement, connect the measurement point at the higher pressure to the transducer
connection marked by the symbol "P+" and the measurement point at the lower pressure to the transducer connection
marked by the symbol "P-" using plastic tubes with a diameter of at least 6 mm. See picture.
Firmly secure the tubes to the transducer connection in order to prevent occasional disconnections due to the air
pressure.
The pressure transducer has an IP54 protection level and can be installed both inside and outside the unit.
The transducer must be kept away from potential sources of heat both inside and outside the unit, as they may
damage the transducer as well as the tubes.
The unit must operate with the pressure differences required to provide for at least the min. air flow
specified in section "Limits of use - Min. area of air conditioned space and max. refrigerant charge".
Transducer installation and wiring are under the responsibility of the installer.
Refer to the instructions provided together with the transducer and to the wiring diagram of the unit for
installation and commissioning.
Translation from original instructions
Packaged Rooftop
54
Fig. 34 Differential air pressure switch
Fig. 35 Details in differential air pressure switch
P+
P-
We reserve the right to make changes without any prior notice.
UATYA
4P645202-2
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