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Hitachi RAS-25QH1 Technische Information Seite 185

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3 IC1 is a multiplexer which is controlled by the signal from the outdoor microcomputer. It selects the
temperature data of the outdoor temperature, DEF or FIN thermistor and outputs it via pin @) to supply it to
pin © of the outdoor micro computer.
IC1
Outdoor microcomputer
©
@® ov
:
iV
fe
NG
®
© w
4
!
Outdoor temperature data
DEF data
FIN data
Fig. 11-2:
A CAUTION
3% The FIN thermistor does not operate when the system (refrigerating cycle, electric parts) is normal.
%
Be sure to install the pipe thermistors at the specified positions securely. Otherwise, the power expa-
nsionvalves will not operate correctly.
- 192 -

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