Hitachi RAS-3-HVNC - Checking Procedure Before the Test Run

6. Optional functions
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SMGB0079 rev.0 - 01/2013
6.2 Optional functions (By 7-segment display)
The outdoor unit has several optional functions which can be selected through the 7-segment display of the outdoor unit
PCB.
6.2.1 Setting of the optional functions
The optional functions of the outdoor unit are set up from the PCB of the outdoor unit and can be selected by pushing
switches PSW1, PSW2 and PSW3.
N O T E
Beforesettingtheoptionalfunctions,mustbecompliedthefollowingconditions:
• Outdoorunitmustbestopped
• Checkmodemustnotbeselected
• Externaloptionalsignalmustnotbeconnected
If the initial setting has to be modied, the following instructions must be followed:
1 Set pin 5 of DSW2 to ON. Set pin 4 of DSW1 to ON. Because of these settings, the optional function selection mode
becomes available and the following indication appears on the 7-segment display.
F A 1
Optional function Availability
This example indicates that optional function “Control of the indoor unit fan during Thermo-OFF in heating mode” is
available.
2 By pressing the push switches PSW2 and PSW3, it can be changed the optional function. (See the owchart show in
the next page).
3 By pressing the push switch PSW1, it can be selected the availability of this optional function. (See the owchart show
in the next page).
4 After selecting the function number, return pin 5 of DSW2 and pin 4 of DSW1 to OFF position.
The selected contents are memorized in the outdoor unit printed circuit board and the function selection mode is stopped.
The memorized data is maintained even power source lines are disconnected. The details of each function are described
in the section Description of the optional functions on this chapter.