One outdoor unit + one indoor unit (three speed fan, larger ducts)
one outdoor unit + one indoor unit (variable flow, larger ducts)
one outdoor unit + one indoor unit (variable flow, smaller ducts)
one outdoor unit + multiple indoors (vraf)
VRAF Multi systems connect multiple indoor units to a single outdoor unit. These systems are used when it is impossible to provide access for ductwork between roof pitch changes or there is only sufficient space for a single outdoor unit. VRAF multi systems provide additional flexibility for system designers however when using these systems it is important to make certain the overall system refrigerant volume is kept to a minimum and does not exceed the safe limit in the event that the total refrigerant charge is lost through a single indoor unit leak. If this limit is exceeded a refrigerant sensor and alarm system is needed.