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The internal units used on GHP systems are identical to those used on KX/GHP systems. The control language is the same, and all remote/centralized controls are also the same.
A total of 20 indoor units can be connected to each GHP, and can be controlled individually, in heating or cooling mode, dependent on the mode operation of the GHP system, i.e. it is not possible to have some units on cooling while others are on heating.
The internal units are connected by two refrigerant pipes with branch pipe kits or headers branching from the main 2-pipe circuit.