Hitachi YUTAKI ATW-YMM-01 Installation And Operation Manual page 17

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. Not used
Factory setting
Defrost for the water electric heater
(Do not change)
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DSW8/DSW18: Not used
Factory setting
(Do not change)
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DSW15 & RSW2/ DSW16 & RSW1: Not used
Factory setting
(Do not change)
11 PMML0345A rev.1 - 08/2016
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SSW1: Remote/Local
Factory setting
(Do not change)
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SSW2: Heat/Cool
Factory setting
(Do not change)
8.5.3 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 transmission for unit controller
Remote
Local
Heat
Cool
Indication