Setting Method - Hitachi SAMURAI Series Service Manual

2. Control Functions
Control of Master/Slave group
2.3 Control of Master/Slave group
2.3.1 Summary of control of Master/Slave group
In addition to the operation as a single chiller unit, this product allows the operation of multiple chiller units as a single heat
source system.
1 Features
• The function to control the Master/Slave group comes equipped as standard, and thus an exclusive controller is not
necessary.
• It is possible to connect up to 8 modules to 1 group.
• The modules within 1 group should be set with module number addresses between 1 and 8, and the module
designated as unit 1 controls the number of units
• There is a mode that determines the number of units in operation from the variations in inlet temperature of the chiller
unit (1-pump system).

2.3.2 Setting method

1 For standard specifications (RCME-AH1 and RHME-AH1), the following settings are done locally.
a. Connection of transmission wires
Connect the terminal boards of the chiller units that compose a same chiller group (a maximum of 8 units) with
transmission wires.
b. Setting of terminal resistance
Perform the setting of the terminal resistance. Choose one unit, which may be any from unit 1 to 8, and switch ON
(up) DSW7-1 of its CPU PCB (PCB
c. Setting of address
For all the chiller units in the same group, configure address settings.
Please set the addresses in ascending order, without leaving gaps. (Example: Set unit numbers from 1 to 5, if there
are 5 units connected).
Missing or duplicated numbers will result in transmission error.

DSW3 of setting PCB (PCB
Unit 1 (Master)
Unit 2 (Slave 1)
Unit 3 (Slave 2)
Unit 4 (Slave 3)
Unit 5 (Slave 4)
Unit 6 (Slave 5)
Unit 7 (Slave 6)
Unit 8 (Slave 7)
d. Setting of number of connected units
For the chiller unit set as unit 1 by address setting, configure the setting of the number of chiller units connected to
the same group. (This setting is not required for units 2 to 8).
N O T E
• Refer to the instructions for water piping works for the attachment position of each sensor.
• Plug in the connector of each sensor into the control PCB of the chiller unit set as unit 1 by address settings.
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SMGB0082 rev.1 - 07/2015
).
C
)
A
#1
OFF OFF
OFF OFF
OFF
OFF
ON OFF
ON OFF
ON
ON
PCB Unit 1 only
A
RSW1
#2 #3
OFF
ON
ON OFF
ON ON
OFF
ON
ON OFF
ON ON
Adjust the arrow
to the number
#4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF