Hitachi RAC-35WPC, Technical Catalogue

Page: 38 / 42

OPTION LIST
36
C CAUTION:
–
DO NOT set various main adaptors in the same
refrigerant cycle.
6) Procedure when applying 200V voltage to H-LINK
wiring incorrectly.
In case of applying 200V voltage to H-LINK wiring
incorrectly, the fuse installed in a transmission circuit on
PCB will blow out. In this case, reconnect the wiring
correctly and turn ON No. 2 pin of DSW4 on PCB. The
transmission circuit can be recovered. (If applying this
error again, the transmission circuit can not be
recovered)
7) Terminating resistance is set in whole H-LINK system.
a) If H-LINK connecting devices like package air-
conditioner are connected besides the RAC
Adaptor, set the terminating resistance by those
connecting devices. The terminating resistance
should be set ON in only one position in whole H-
LINK system.
b) In case that H-LINK is connected only by the RAC
adaptor, set the terminating resistance by the RAC
adaptor. The terminating resistance should be set
ON in only one position in whole H-LINK system.
10.2.5. TEST RUN
Test run should be performed in the following after finishing
the installation, wiring and setting. Refer to the installation
manuals enclosed with the control system equipment.
1) Confirmation of RAC Adaptor Connection
Confirm if the RAC adaptor connection is recognized in
the control system equipments. In case that it is not
confirmed, check the transmission cable, refrigerant
cycle #, indoor unit #, terminal resistance setting etc.
2) Registration
Confirm if the RAC adaptor connection is recognized.
3) Confirmation of RUN/STOP Operation.
Confirm if the room air-conditioner operate correctly by
RUN/STOP from the central control system
equipments. Check also if the room air-conditioner
operation changes correctly by each setting.
Refrigerant
U
Unit#
Indoor U Unit#
DSW4
Turn ON No.2 pin of
D
DSW4
ON
Ç Ç
1 2
PCB
DSW4
Turn ON No.1 pin of
D
DSW4
ON
Ç Ç
1
2
PCB