2. Control Functions
Control of Master/Slave group
SMGB0082 rev.1 - 07/2015
53
2
2.3.3 Operation method
One group composed of multiple modules using the functions to control the number of units is called a "system".
1 Operation Order (Required)
Please input "System Operation Order" for the chiller unit set as Unit 1.
It is also possible to put the system to operation from the "Local system operation switch" installed inside the electrical
box.
Control board of unit number 1
Run
(*)
System operation
order switch
Stop
System operation
order switch
System
ON
OFF
Run
Stop
*System operation orders are level signals
N O T E
Pay attention to the fact that it is different from the Run/Stop Order (Terminal No. 5,6,7 ) in the case of standalone opera-
tion of the Chiller Unit.
System cooling/heating mode (required for air-cooled heat pump. Not necessary for air-cooled)
Connect “Cooling/Heating Switching Wiring” to the chiller unit set as Unit 1.
Control board of unit number 1
Heating
Cooling/heating
switch
Cooling
27
28
Operation mode
of the system
Heating
Cooling
Cooling/heating
switch
Heating
Cooling
2 Pump Interlock Wiring (Required)
Input the feedback signal of the pump to all the chiller units. (Also necessary in the case of batch pump)
Chiller units without pump feedback signal input will not operate.
Pump feedback signal
3
Pump operation order wiring (Not required for specifications with pump mounted)
Please connect the wiring, since pump operation signal is output from each chiller unit. Since it is possible to output the
pump operation signal of all chiller units during system operation in the case of 1-pump systems, then in the case of
batch pump, please attach wiring to the chiller unit set as unit 1 only. (Please connect interlock wiring to all the units )
