Hitachi RCI-1.0FSN3 Service Manual page 176

4 Electrical wiring
PCB2 settings
DSW1: Optional functions
Factory setting
Pin 7: Common operation of remote control switch
C A U T I O N
If there is an indoor unit connected in the same RCS line as DX-Interface EXV-(2.0-10.0)E1 or KPI-(E/H/X)3E, then
pin 7 must be ON to disable the power supply to RCS line. If there is no indoor unit connected to the same RCS
line but there are more than one DX-Interface EXV-(2.0-10.0)E1 or KPI-(E/H/X)3E, then only one DX-Interface EXV-
(2.0-10.0)E1 or KPI-(E/H/X)3E should have pin 7 OFF while all other units must have pin 7 set to ON. Failure to
perform this setting correctly will result in bad communication and can even cause physical damage to the PCB.
DSW2: End resistance
No setting is required.
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DX-Interface
PCB1 Settings
DSW3: Capacity code setting
No setting is required. This DIP switch is used to set the capacity code corresponding to the DX-Interface power (HP).
DSW4: Unit model code setting and optional setting
No setting is required.
164
SMGB0077 rev.0 - 01/2013
HP 2.0
Factory setting
HP 5.0
Factory setting
Factory setting
Enabled EC fan motor alarm by
tachometer input
All units
ON
1 2
2.5 3.0
6.0 8.0
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
4.0
10.0
7 8
7 8