Hitachi YUTAKI S Series Instruction Manual page 38

Electrical and control settings
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DSW5: Additional setting 3
In the cases where the outdoor unit is installed into a location
where its own outdoor ambient temperature sensor can not
give a suitable temperature measurement to the system, it
is available the 2nd outdoor ambient temperature sensor as
accessory. By means of DSW1&2 setting, the preferable sensor
for each circuit can be selected.
Factory setting
Outdoor unit sensor for circuits 1 and 2.
Outdoor unit sensor for circuit 1; Auxiliary
sensor for circuit 2.
Auxiliary sensor for circuit 1; Outdoor unit
sensor for circuit 2.
Auxiliary sensor instead of outdoor unit
sensor for both circuits.
Use the maximum temperature value
between Two3 (boiler / heater thermistor)
and Two (water outlet thermistor) for water
control
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DSW6: Not used
Factory setting
(Do not change)
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DSW7: Additional setting 4
Factory setting
Compatibility with ATW-RTU-04 (When
cooling mode operation is needed)
20 PMML0574 rev.1 - 09/2021
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DSW18: Not used
Factory setting
(Do not change)
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DSW15 & RSW2: Not used
Factory setting
(Do not change)
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DSW16 & RSW1: Not used
Factory setting
(Do not change)
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SSW1: Remote/Local
Factory setting
(Remote operation)
Local operation
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SSW2: Heat/Cool
Factory setting
(Heat operation)
Cool and Heat operation in case of Local
5.6.3 LED indication
Name Colour
LED1 Green Power indication
LED2 Red Power indication
LED3 Red Heat pump operation (thermo ON/OFF)
LED4 Yellow Alarm (flickering with 1 sec interval)
LED5 Green Not used
LED6 Yellow H-LINK transmission
LED7 Yellow H-LINK remote control transmission
Remote
Local
Remote
Local
Heat
Cool
Heat
Cool
Indication