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To calculate the coil length, you need to convert the coil size and its weight to the SI units.
3 ton
2 ton
4 ton
2 ton.
1.5 ton
This is a 3 ton unit.
The rating is technically a minimum. You could use a larger coil and have it work. But if its a Evaporator coil it will need to be matched on the far end with a similar or larger condenser coil. If the Condenser coil is larger it will probably just take a little more refrigerant.
Most manufacturers put a number related to Btu's of the unit in the model. If Rheem is no different then that 42 represents a 3.5 ton unit as there are 12,000 btu's / ton and 3.5 X 12 = 42.
It is a 2 Ton Unit
4 ton
five ton