Hitachi RCUE40AG1 Installation, Operation And Maintenance Instructions page 28

CONTROLLER ADJUSTMENT
8
/24
"
Manual Set Switch B = DSW4
The figure 2 of the DSW4 switch must be turned to the ON
side.
The figures 3 and 7 of the DSW4 switch are initially set as
follows depend on the unit model.
Setting at the figures 1, 4, 5, 6 and 8 of the DSW4 switch
should not be permitted (always at OFF side).
3
Figure
ON
Location
Type of
R407C LW
Chiller/Refrigerant
3
Figure
OFF
Location
Type of
R407C ST
Chiller/Refrigerant
ST: Standard model
LW: Low Ambient (option)
R22 (Option)
The figures 9 and 10 of DSW4 switch are for compressor
size setting as follows.
9 10
Figure
OFF ON
Location
40 HP
Compressor
"
Selection Switch for Cooling/ Heating
Operation = SW8
= All model in this series are for cooling only. So that
Heating function is Not available.
The SW8 Selection Switch must be turned to the upper
side.
"
Selection Switch for Local/ Remote Operation =
SW6
= Remote operation is standard. So that the SW6 selection
switch is turned to the lower side.
If local operation is required, the SW6 selection switch is
turned to the upper side.
"
Selection Switch for Local/ Remote Pump
Operation = SW7
= The SW7 selection switch is turned to the lower ("OFF")
side as remote setting.
If local operation is required, the SW7 selection switch is
turned to the upper side.
"
Anti-freeze Control by Pump Operation =
DSW6-2pin
If the ambient temperature get lower than 2 °C, water pump
is operated forcedly and it protect water line against
freezing. OFF side setting of DSW6-2pin makes this control
available.
This control is available only when the pump is controlled
by Chiller (See wiring diagram).
"
Other Switches = SW5, DSW6, RSW9 and
DSW1
This control panel is equipped with other switches:
The SW5 selection switch for chilled water/brine water, so
that this switch must be turned to the upper side
("water"). DSW6 and RSW9 for operation mode and
setting change of these switches are not available.
It is recommended that the setting is not changed at site.
Also, the DSW1 switch is equipped with. This switch is
used for only checking, resulting in easy troubleshooting.
7 3 7
ON ON OFF
R22 LW
7 3 7
ON OFF OFF
R22 ST
9 10 9 10
ON OFF ON ON
50 HP 60 HP
" Anti-freeze Control by Pump Operation =
DSW6-2pin
If the ambient temperature get lower than 2 'C, water pump
is operated forcedly and it protect water line against
freezing. OFF side setting of DSW6-2pin makes this control
available.
This control is available only when the pump is controlled
by Chiller(See wiring diagram).
If water outlet temperature gets higher than 15°C, water
pump is intermittently run with 5 minutes running and 55
minutes stopping.
The segment indicates 'PU' for 5 minutes in running and
'88' for 55 minutes in stopping.
If ambient temperature gets higher than 4°C, this control
would be cancelled.
Case 1. In case the ambient temp. decreasing
Chilled
Water
Temp.
(°C)
Ambient Temp. (°C)
Case 2. In case the ambient temp.increasing
Chilled
Water
Temp.
(°C)
Ambient Temp. (°C)
Symbols
Show
For example, in case that this protection works under
ambient temp. is 2°C and chilling water is 10 ~15°C, then
the water pump is run continuously.
When DSW6-2 is positioned at ON, makes this control be
invalid. In case Chiller receives the running operation
during this control, this protective control would be
cancelled and go back to the normal water pump control.
This freeze protective control is not available under
alarming due to water outlet or ambient thermistor
abnormality (open or short circuit: alarm code... '12' or '22').
" Other Switches = SW5, DSW6, RSW9 and
DSW1
This control panel is equipped with other switches:
The SW5 selection switch for chilled water/ brine water, so
that this switch must be turned to the upper side
("water"). DSW6 and RSW9 for operation mode and
setting change of these switches are not available.
It is recommended that the setting is not changed at site.
Also, the DSW1 switch is equipped with. This switch is
used for only checking, resulting in easy troubleshooting.
Continuous Run
Intermittent Run
Stopped