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2.5 ton
5 ton
3ton
What is the serial number? Usually it is in this number.
4 ton
34,000 BTU's
i am guessing 1 ton
The air handler does not have a tonnage rating, the evaporator coil within it is what you`re looking for since any given air handler can accomodate several different coil sizes. For the answer to your tonnage question see the tag on the coil, though that may prove to be difficult since it is enclosed in the plenum. An easier method would be to get the tonnage from the condenser model # in the yard.
2.5 ton at least a good guess due to the 30 in the middle of the model number. Which would stand for 30,000 btu's or 2.5 tons. How large of an area does this unit cool?
model # GMP050-3 what is the tonnage of this unit
4 Ton
While i do not know the answer to your question, i can say if you have a chrysler air handler it is definitely advised to get it replaced. They stopped being made around 40 years ago, and parts are no longer sold for them from the manufacturer.