Optional Functions; Optional Functions Through 7-Segment Display On The Rasc Unit Pcb - Hitachi RASC-4HNPE Service Manual

6 Optional functions

Optional functions
6.2 Optional functions
HITACHI units provide a large number of optional functions to adapt the system to the requirements of the customer.
Each function is selected from different sources:
•

Optional functions through 7-segment display on the RASC unit PCB.

• Optional functions through remote controllers.
6.2.1 Optional functions through 7-segment display on the RASC unit PCB
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Setting of the optional signals
The optional functions of the RASC unit are available for being selected using the PSW switches and 7-segment on the
RASC unit PCB.
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N O T E
Before setting the optional functions, must be complied the following conditions:
• RASC unit must be stopped.
• Check mode must not be selected.
• External optional signal must not be connected.
1 Set pin 4 of DSW1 to ON.
2 Set pin 5 of DSW2 to ON. Because of these settings, the optional function selection mode becomes available and the
following indication appears on the 7-segment display.
This example indicates that optional function "Control of the indoor unit fan during Thermo-OFF in heating mode" is
available.
3 By pressing the push switches PSW2 and PSW3, the optional function can be changed. (See the flowchart shown in
the next page).
4 By pressing the push switch PSW1, the availability of this optional function can be selected. (See the flowchart shown
in the next page).
5 After selecting the function number, return pin 5 of DSW2 to OFF position.
6 Set pin 4 of DSW1 to OFF.
The selected contents are memorised in the RASC unit printed circuit board and the function selection mode is stopped.
The memorised data is maintained even power source lines are disconnected. The details of each function are described
in the section "Description of the optional functions"
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N O T E
(*) SET*: Blank space is for recording the selected setting.
101 SMGB0091 rev.2 - 11/2015
F A
Fixing of demand function
on this chapter.
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Available
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