Daikin RXYQ5-48MAY1 Service Manual page 159

Field Setting
Set Cool / Heat Separately for Each Outdoor Unit System by Cool/Heat Switching Remote Controller
148
It does not matter whether or not there is outdoor - outdoor unit wiring.
Set outdoor unit PC board DS1-1 to "outdoor" (factory set).
Set cool/heat switching to "individual" for "Setting mode 1" (factory set).
Si39-407
Test Operation