Hitachi FS3 Series, Service Manual

Page: 213 / 240

4
OPTIONAL FUNCTION
13
4.3.2.
SIMULTANEOUS OPERATION
n
Simultaneous Indoor Unit Operation with Remote
Control Switch
%
DANGER:
All power sources must be turned off!!
Up to 16 indoor units can be simultaneously controlled
using one remote control switch. The operation mode such
as fan, cooling or heating, the setting of air flow, the setting
of temperature and the setting of run/stop can only be set
uniformly for all units. However, on/off operation of each
thermostat can be done individually. Defrosting, protective
devices function, etc. are individually performed.
a. Perform wiring between indoor units as shown in the
following figure.
* The total length of the wire shall be 200m or shorter.
(for 0.75mm² wire 500m or shorter)
* Use the following three cable wire in the system
parts.
Model PRC-10E PRC-15E PRC-20E
Lenght 10m 15m 20m
&
CAUTION:
When 0.3mm² wires are used, the length between
units must be 100m or shorter, and the total length
must be 200m or shorter. (When 0.75mm² wires
are used, the total length can be extended up to
500m.)
b. Connected unit control wires should not be installed
parallel to 220-415V power cables. Fix them by utilizing
bands. It is recommended, that cables be installed at
least 30cm away from power cables or be put into
grounded metal pipes.
c. Set rotary switches RSW on the printed circuit boards of
respective units as shown in the following figure.
%
DANGER:
Turn off all power sources!!
Œ
Setting of Rotary Switches:
When indoor units are connected to the same
outdoor unit, it is unnecessary to set rotary
switches, because they are automatically
addressed.
Unit nº 0 Unit nº 1 Unit nº 2 Unit nº 3
Unit nº 4 Unit nº 5 Unit nº 6 Unit nº 7
Unit nº 8 Unit nº 9 Unit nº 10 Unit nº 11
Unit nº 12 Unit nº 13 Unit nº 14 Unit nº 15
&
CAUTION:
Pay attention not to overlap addresses.
d. Check Method of Number of Connected Units
Perform this check after finishing wiring, refrigerant
piping, additional refrigerant charge and other items
required for operation.
Test Running Mode
1. Turn ON the power sources of all units. Depress the
CHECK switch and the MODE switch on the remote
control switch simultaneously for three seconds or
longer, to change the unit(s) to the test running
mode. (Refer to the checking procedure by the
CHECK switch.)
Number of Units Connected
2. When the number of units connected is indicated
where usually the temperature is indicated, the
system is functioning normally.
RSW
Main Unit PCB
Use an optional
extension cable or field-
supplied 0.3mm² cable
Set the rotary switch No.1
CN13 (blue)
CN12 (yellow)
CN13
(blue)
CN12
(yellow)
1 Set
Controller
In case of using 0.3 mm²
cable, the total length of
the cable must be within
200 m
Setting position
Set by inserting a
screwdriver into the
groove.