What is the difference between the GM9S920803BN and the GR9S920803BN?

GR9S920803BN is a new model that was made to be paired with condensers that use R32 refrigerant. GM9S920803BN is the previous version of it that pairs with R410A condensers, but can still work with R32 condensers provided that a furnace integration kit is installed with it.

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