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Starting Torque - 4th digit
1, 3, 5, 6, 0, A - Normal: suitable for capillary tube and other self equalizing systems
2, 4, 7, 9 - High torque: for either expansion valve or capillary tube systems
Capacity Key
5th digit = number digits in capacity
6th, 7th digit = significant capacity digits
(i.e., AEA4492AXA = High torque, 9,200 BTU)