Hitachi SAMURAI Series Service Manual page 35

2. Control Functions
Control functions on the module
2.1.12 External thermo operation from external contact
In case of setting the chiller unit to run/stop with the order of an external contact such as that of a (locally supplied) external
thermo, capacity control function is disabled and operation is performed at 100% load. This function is mainly oriented to
thermal storage operation.
It is not possible to use this function together with the function to control the number of units.
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Setting method
1 Please set the local/remote switch (SW2 on PCBa) to remote side.
2 Connect the forced load operation switch to [24]-[25] of terminal block.
3 The wiring side used together by normal remote operation (air conditioning operation) and forced load operation
(thermal storage operation) is shown.
Local
Remote
SW2
PBSR2
(OFF)

Time chart
Forced
load
operation
switch
Chiller
unit
N O T E
• Forced load run/stop from local external contact cannot be performed by pulse signal.
• Normal operation order and thermal storage order must be input to the chiller unit separately.
• For local external contact orders, ensure a minimum interval of 5 minutes of continuous operation order (5 minutes of
stop time, too).
• For the additional wiring, put it separately inside a metallic pipe, or use a shielded wire.
• Always operate the air conditioning/thermal storage switch while the chiller unit is stopped.
27
SMGB0082 rev.1 - 07/2015
Remove the wiring between
5 and 6 if it is connected
5 6 7
Air conditioning
(Thermal storage)
Switch between air conditioning
and thermal storage
PBSR1
(OFF)
2 0V 3
ON
OFF
Please keep more
than 5 minutes
Run
Stop
24 25
(Thermal
storage)
(Air conditioning)
SW2
Forced
load
operation
switch
2 0V 3
Please keep more
than 5 minutes
2