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Model # for Lennox HVAC unit
Tonnage means the about something weighs or the amount of BTU’s a unit puts out. . The lennox model HS19-311U-2p is a 2.5 ton unit and has a tonnage of 2.5 BTU's.
2.5 ton
5 ton
That is a 9 seer condenser
your unit should be a 13 seer 3.5ton
The AC condenser unit is located right in front of the radiator.
The rated latent and sensible capacity of the condenser on a single stage unit (normally found in the model #) plus the heat of compression added by the compressor.
The B19 is the model or series. The 51 is the tonnage( the unit is actually a four ton unit with the coil being a little bigger for increased efficiency.
HS19 is a High Side condensing unit series 19 rated at (511) 51,000 BTU/hr or 4 tons.
To condense