30 EN/39B/06.2018 © STULZ SpA – all rights reserved
SAL
Dirty filter alarm device RFS
It provides a signal, via the display; which indicates the need to replace air filter.
RFS
Range 50 – 500 Pa
Differential pressure 20 Pa ± 15%
P1 : Connection of the high pressure.
P2 : Connection of the low pressure.
Adjustment:
Using a screwdriver, you can adjust the desired differential
pressure, over which the filter control triggers, at the
central screw.
Technical features:
Power supply: 1.0 (0.4) A; 250 Vac – 0,1 A; 24 Vdc
Operating temperature: -20/+85°C
Max. pressure: 10 kPa
Housing: PA 6.6
Protection: IP54
Diaphragm: Silicone
Pressure connection: Ø 6 pipe
Wiring :
Contact 31 opens, when the differential pressure increases to the
adjusted value. Simultaneously contact 32 closes, the signal is
transmitted by this contact.
C2020 I/O Controller
There are two electronic boards in a SplitAir3: one in the internal unit and the other in the external unit.
The microprocessor-based electronic board is equipped with a set of terminals which are necessary
to connect the board to the controlled devices (e.g. valves, compressors, fans). Software with
working logic and parameter settings are written in the EEPROM so that they remain permanently
stored even in case of power failure.
C2020 controller is housed inside the electrical box and can control only one air conditioner. C2020
controllers on different units (up to 5) can be connected in a LAN for the facility of data transfer (e.g.
for sequencing). When shielded cables are used for that link, exploit the screw near the slave port to
perform grounding (see picture) and put a washer between the eyelet and the plate.
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