Stulz Free-Air-3-IN, Руководство по эксплуатации, Страница: 14 / 31

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Free-AIr-3-IN
EN/02.2018 © STULZ SpA – all rights reserved
Temperature probes
2 PTC temperature probes are supplied loose with screened cables 8 m long and must be
connected to the C102 controller, in order to measure following parameters:
• Internal air temperature: shipped loose with screened cable 8 m long;
• •External air temperature mounted inside the unit.
STANDArD COMPONeNTS WITH Free-AIr-3-IN
electronic controller C102
This microprocessor-based I/O controller is equipped with a set of terminals which are necessary
to connect the board to the controlled devices (e.g. valves, compressors, fans). The program,
composed of a software version with working logic and of a file with the value of parameters, is
written in the EEPROM, so that it is permanently stored even in case of power failure. C102 is
housed inside the electrical panel and can control one Free-Air-3-IN unit. A keypad is connected to
C102 to display working conditions, working state of the unit and possible alarms.
INFOrMATION
For controller input / output assignation, please refer to the electrical diagram included in part 2
manual, specific of each unit.
rFS dirty filter pressure switch
This gives a dirty filter signal, shown both on the display and on a voltage-free contact. It indicates
when it is necessary to clean or replace the air filter.
Range : 50 – 500 Pa
Differential pressure: 20 Pa + 15%
P1 : High pressure connection
P2 : Low pressure connection
Adjustment:
Use a screwdriver on the central screw to adjust the differential
pressure to the desired value at which the dirty filter signal trips.