Traditional split system (monosplit):
The condenser is designed to serve only one evaporator with the corresponding capacity. In other words, an 18,000 BTU condenser must be connected to a single 18,000 BTU evaporator.
Multi-split system:
To connect two evaporators (such as a 9,000 BTU and an 18,000 BTU) to a single condenser, the condenser must be a multi-split (or multi-split inverter) sized and compatible for this type of configuration.
⚠️ Problems that may occur when attempting this "alternating" connection with a standard condenser:
Damage to the compressor or electronic board.
System malfunction (incorrect pressure and flow rate).
Risk of component burnout.
Void of manufacturer's warranty.
✅ Suitable solutions:
Install two independent systems:
A 9,000 BTU split unit with a 9,000 BTU condenser.
An 18,000 BTU split unit with an 18,000 BTU condenser.
Use an inverter multi-split system:
Example: a 27,000 BTU multi-split condenser unit with independent outputs for 9,000 and 18,000 BTUs, controlling each room separately.
Even in this case, it is necessary to check the compatibility of models and the capacity of the outdoor unit.
