Setting Items - Hitachi SAMURAI Series Service Manual

2. Control Functions
Control of Master/Slave group

2.3.5 Setting items

Water temperature
Addition
Reduction
¦
¡
Outlet water temperature
 Water temperature setting
Sets the temperature in degrees of the outlet water from
the chiller unit to which the water temperature has to be
controlled.
Settings are performed at the Master module LCD
screen of unit 1. The setting method is the same as with
the settings of individual operation. By changing the
settings of Master module, the settings of slaves 2~8 are
also changed automatically.
Refer to "2.1 Control functions on the module"
¢ Setting temperature difference
Sets the target difference between water inlet and outlet
temperature to increase the number of units in operation.
£ Temperature range of addition
Sets the range of change of inlet water temperature to
add units, in case that the difference of temperature
reaches the temperature difference set at ¢.
 Temperature range of reduction
Sets the range of change of inlet temperature to reduce
units, in case that the difference of temperature reached
the temperature difference set at ¢.
 Waiting time for effect of addition
Sets the time during which the next addition process is
prohibited, after having added once (start-up of 1 unit).
Recommended > 3 minutes
 Waiting time for effect of reduction
Sets the time during which the next reduction process
is prohibited, after having reduced once (stop of 1 unit).
Recommended > 3 minutes
47
SMGB0097 rev.0 - 07/2015
Inlet water temperature
§ Number of Units at Startup
Sets the number of modules to be started up upon
Addition
¥
system start-up.
 Maximum number of operating units
Sets the upper limit of the number of modules that can
£
be operated at the same time.
¤
© Minimum number of operating units
Sets the minimum number of modules to be operated at
light load operation.
¢
 Pump operation
Selects batch or individual.
When selecting individual, pump operation order is
linked to the run/stop of the module.
When selecting batch, all the modules which are target
Time
of the control of group (Master/Slave) during system
operation set pump operation order to ON continuously.
 Priority setting
It is possible to set a priority order, when it is necessary
to operate a certain unit preferentially.
It is possible to set up to 8 steps for priority order.
In case that there are multiple modules with the same
priority order, they operate in rotation.
Number of the
Priority setting
• The operation time of units with higher priority order
becomes longer.
• Settings ¢ to  are performed at the Number of units
setting screen. Refer to
confirmation of operation conditions through the LCD
screen".
1 2 3 4 5
module
1 1 1 2 2
In case that there is a load
This 3 units are
exceeding the amount of 3
operated with the
units, one unit out of these 4
maximum priority, with
is chosen for startup, with a
a rotation based on
rotation based on operation
operation time
time.
N O T E
"2.3.6 Method for setting and
2
6 8
7
2 2 3
This unit is
the last one
to start up