This is the way to find out....
Go to Google.
Enter Allegiance Air Conditioning
It came up that is made by American Standards. Click to go to....
On that site you can find support or enter your zip code and find a local distributor that can help you find the answers to your questions.
Allegiance 10 is an old model but I'm sure they have the specs handy.
Need Model Number
Allegiance 10 air conditioners are rated from 1-5 tons. You need the model number to tell how many tons capacity.
The manual for the air condition is here:
Page 4 tells you how to convert the model number into tons.
For example, in model number 7 A 0 0 4 2 A 1 0 0 A 0 the 042 = 42 MBTUH - 4 tons.