Hitachi RAC-25WXD, Technical Catalogue, Page: 33 / 39

OPTION LIST
3 1
b) When installing on the room air-conditioner
In case that it cannot be installed to the wall due to
the space or material problem, install the RAC
adaptor with the two-sided tape (accessory) on the
room air-conditioner.
i) Confirm if the piping cover of the unit can be
removed when performing the service
maintenance, and then fix the RAC adaptor in
the side of room air-conditioner with two-sided
tape. (Available at the right as well as left side)
ii) Clean the surface to be installed with a dry
cloth.
NOTE:
–
Consider the following points since the adhesiveness
changes according to the environmental conditions
(temperature, humidity etc)
– The adhesiveness is decreased when there is humidity
or oil.
– Warm the adhesive part and installation place of the
two-sided tape to avoid the decrease of the
adhesiveness in case the ambient temperature is low.
–
DO NOT touch the adhesive part by fingers nor re-
attach it many times. The adhesiveness has decreased
and the RAC adaptor may fall off.
–
DO NOT apply any force within 24 hours after
installation.
10.2.3. ELECTRICAL WIRING

System configuration
CAUTION:
– Turn OFF the power supply of the room air-conditioner
of the central control device when performing the wiring
work
–
DO NOT run all the H-LINK cable or power supply
cable along the other signal cable, or malfunction may
occur due to the noise, etc. If it is required to run along
the other transmission cable, separate the cable more
than 30cm, or run the cable through the metal tube and
earth the tube.
–
Follow local codes and regulations when performing
electrical wiring and earth wiring.
–
Transmissions cable used in H-LINK shall be 2 cores
cable (0.7mm
2
to 1.25mm
2
–
DO NOT use wire with more than 3 cores.
for model: VCTF, VCT,
CVV, MVVX, CVVX, VVR, VVF) or 2 cores twisted pair
cable (model: KPEV, KPEV-Spec). Total length of cable
shall be below 1000mm.

Internal components and Wiring connections
Check the contents and the number of the accessories in
the packing.
• Access
Open the cover by removing the
①
and
②
screws.
• Wiring Connection
Connection with Room Air-Conditioner
i) Remove the front cover of the room air-
conditioner and the cover of electrical box.
ii) The cable attached with the connector of the
RAC adaptor shall be connected with the
connector of indoor PCB
An example of
installation at the right
side
RAC
adaptor
Cover
40mm
Keep distance of 10mm
Central Station web Central Station
Indoor unit
Indoor unit
RAC
adaptor
Outdoor
unit
H-LINK
Room Air- conditioner
Outdoor unit
H-LINK
RAC
adaptor
Indoor
unit
Indoor
unit
Outdoor
unit
Outdoor
unit
HITACHI
PSC 6RAD