Hitachi RPI-0.8FSG1 Service Manual page 343

<PC-P1H>
(1) By installing an additional remote control switch, a maximum of 16 units can be controlled from two
different locations.
Main and Sub Control Switch
Determine one of the two remote control switches to be the main switch and the other as a sub
switch. Set the sub remote control switch by referring to the "4.4.4 (31) Optional Function Setting".
Then turn off and on the power source.
(2) Wiring Method
(a) Perform wiring between units as shown in the following figure:
(Three Unit Case)
* Simultaneous Indoor Units Operation in Same Refrigerant Piping System
Main
Indoor Unit
Main Switch
(Remote
Control Switch)
(b) Decide the number of units. The method should be the same as in "Simultaneous Indoor Unit
Operation with One Remote Control Switch".
* Simultaneous Indoor Units Operation in Plural Refrigerant Piping Systems
Outdoor Unit
Refrigerant
System 1
Main
Indoor Unit
Main Switch
(Remote
Control Switch)
ATTENTION:
1. When a main remote control switch malfunctions, unit operation stops. The units cannot be operated
with only a sub-remote control switch.
2. When a main switch and a sub-switch are simultaneously operated, the units will operate according to
either one of the modes after 30 seconds.
Control Cable
(H-LINK)
No. 1 No. 2
Indoor Unit Indoor Unit
Connector Cable
Between Units
Outdoor Unit
Refrigerant
System 2
No. 1 Main
Indoor Unit Indoor Unit
Connector Cable
Between Units
No. 14 No. 15
Indoor Unit Indoor Unit
Sub Switch
(Remote
Control Switch)
Outdoor Unit
Refrigerant
System 3
No. 1 Main
Indoor Unit Indoor Unit
OPTIONAL FUNCTION
(4.4 Remote Control Switch)
Control Cable
(H-LINK)
No. 1
Indoor Unit
4-39