System Wiring Diagram - Hitachi RASC-HNPE CENTRIFUGAL VRF Series Installation And Operation Manual

Electrical and control settings

13.2 SYSTEM WIRING DIAGRAM

Connect the units (outdoor and indoor unit) according to the following electric diagram:
• Connect the operation wiring to the units in the same
refrigerant cycle (The refrigerant piping and the control
wiring should be connected to the same indoor units). If the
refrigerant piping and the control wiring are connected to
the units in the different refrigerant cycle, it may cause an
abnormal operation.
• Use twist pair wire (more than 0.75 mm²) for operation wiring
between RASC unit and indoor unit, and operation wiring
between indoor units (H-Link connection). It can be also
used shielded pair wiring. Shield shall be connected to earth
only in one cable side.
• Use shielded wires for intermediate wiring to protect the
units from noise obstacle at length of less than 300 m and
size complied with local code.
• Do not use more than 3 cores for operation wiring (H-Link).
Core sizes must be selected according to the national
regulations.
Power source from the RASC
unit to the indoor unit
RASC unit of system
Terminal board
Circuit breaker
Earth leakage breaker
Field wiring
Field-supplied
Optional accessory
34 PMML0319A rev.1 - 06/2015
no. 0
3 N
Operating line (twisted
shielded pair cable or shielded
pair cable)
DC5V (non-pole transmission,
H-LINK system)
Indoor unit Indoor unit
Remote control switch
(example for simultaneous control)
• Open a hole near the connection hole of power source
wiring when multiple RASC units are connected from one
power source line.
• The recommended breaker sizes are shown in Table of
electrical data and recommended Wiring, Breaker Size/1
RASC unit.
•
rubber bushes with adhesive on the panel.
C A U T I O N
•
•
Independent power source of RASC
unit and indoor unit (example)
RASC unit of system
no. 0
3 N
Operating line (twisted
shielded pair cable or
shielded pair cable)
DC5V (non-pole
transmission, H-LINK
system)
Indoor unit
Indoor unit
Remote control switch
(example for simultaneous control)