Hitachi UTOPIA RAS-4 Series - Page 112

10 Electrical wiring
DIP and RSW switches settings
TCGB0136 rev.1 - 05/2021
104
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DSW5: Transmission setting of end terminal resistance
Factory setting
Cancellation
In the case that the outdoor units quantity in the same H-LINK is 2 or more, set No. 1 pin of DSW5 at “OFF” side from the
2nd refrigerant group outdoor unit. If only one outdoor unit is used, no setting is required.
Setting for transmission
It is required to set the outdoor unit number refrigerant cycle and end terminal resistance for the H-LINK.
In the same refrigerant cycle, set the same refrigerant cycle number for the outdoor unit and the indoor units.
Example incase of setting before cycle number 25
DSW4: Turn ON pin number 2
RSW1: set dial number 5
0
9
8
7
6
5
4
3
2
1
12
DSW5
12
DSW5
12
DSW5
12
DSW5
Turn OFF DSW5 number 1 pin for cancel of
end terminal resistance setting
Outdoor unit
Outdoor unit Outdoor unit
Outdoor unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Control wiring
(H-LINK II or
H-LINK)
Control wiring
(H-LINK II or H-LINK)
Control wiring
(H-LINK II or H-LINK)