Can someone give me an estimate of age? 1974-75???

Electric Carrier units

AC: Model 38HQ940300 Serial R055014
Heat: Model 40AQ030330JR Serial Q0A54360

Data plates on both were very hard to read. I can’t seem to locate them in either of my reference books.

Thanks in advance!:slight_smile:


According to my foolproof chart (which usually proves to be a fool)…

ANNNNNN This serial number was used from 1969 to 1990. The first alpha character is for the month of production.
A-M = Jan-Dec 1969-1979
N-Z = Jan-Dec 1980-1990

So the letter “R” would be May…

(‘I’ and ‘O’ are not used)
The second digit, a numeric character is the production year
The balance of the numeric characters are the production sequence
e.g., A912345…this serial number would be a unit produced in Jan 1969
P512345…this unit would have been produced in Feb 1985

So the number “0” would be 1980 or 1990

or maybe not…:roll::roll::D:D

This document may help you. Check out Carrier in HVAC section.

Neat chart David. The CARRIER HVAC section agreed with my chart. I wasn’t all that sure about mine because it’s quite old, but I feel better about it now.

And I’m going to file your chart for furture reference. Thanks…