Daikin R410As Service Manual page 139

Field Setting
& Set Cool / Heat for More Than One Outdoor Unit System Simultaneously in Accordance with Unified
Master Outdoor Unit by Indoor Unit Remote Controller
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Install the outdoor unit external control adapter on either the outdoor-outdoor, indoor-
outdoor, or transmission line.
Set outdoor unit PC board DS1-1 to "Indoor" (factory set).
In setting mode 1, set the outdoor unit you want to give cool/heat selection permission to as
the group master, and set the other outdoor units as group slave units.
Set the outdoor unit external control adapter SS1 to Unified (factory set) or Cool, and SS2 to
No (factory set).
Multi outdoor units connection
Si39-302
Test Operation