I HAVE A FEDDERS MODELA3X05FEA SERIAL JNO13839246A HOW old IS IT

Try Fedders web site

How do I tell the age of a Fedders furnace or air conditioner from the serial number?
Although the Fedders brand is used for window units nowadays, this encoding only applies to when they manufactured unitary (split) systems years ago. The second letter of the serial number indicates the year of manufacture (from 1966 to 1977):
A = 1966 B = 1967 C = 1968
D = 1969 E = 1970 F = 1971
G = 1972 H = 1973 I = (not used)
J = 1974 K = 1975 L = 1976 M = 1977
An ancient Fedders unit we recently inspected had the serial number AH11877, indicating that it was manufactured in 1973. The home was built in 1973, which provided a secondary verification of the manufacture date indicated by the serial number

https://www.manualslib.com/brand/fedders/air-conditioner.html

You can buy that at www
supplyhouse.com

Likely in the serial number. Google fedders serial number diagnostics

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

I don't believe you have copied that number correctly.Look for a serial number. Is this a window unit?

You can date that unit and other major home appliances at this site:

Appliance411 Service How old is my appliance Age finder date of...

220 V unit requires a 220 V outlet

5000 btu

Since its a 1972 its probably called a fan center---------combination fan relay and transformer and they are still available.

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http://www.appliancefactoryparts.com/dehumidifiers/helpcenter/ownersmanuals/fedders/

your manuelis here