Trane Unit YCD180F – The actual BTU for this unit is 180,000, but is truncated down to 180. Therefore, simply divide 180 by 12 (12,000 reduced accordingly) to discover this is a 15 ton unit. Bryant – 574D030 – Again the BTU is truncated to 30. This is a 2.5 ton unit. Other manufacturers incorporate the tonnage directly into their unit number.
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