Carrier 38GJQ Series Installation Instructions Manual page 39

Multi-zone ductless system
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Outdoor Unit Installation Sizes 48 and 56
For sizes 48 and 56, one outdoor unit can drive up to three Branch Box (BU) modules and nine different types of indoor units (high wall,
cassette, ducted and floor console). At least one Branch Box (KSAUI0201AAA up to 2 indoor units or KSAUI0401AAA up to 3 indoor
units) is required on these sizes. If two or more Branch Boxes are installed, the Y−type Branch tube (KSAUI0501AAA) is required.
Fig. 79 – Connection Flow
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