Carrier - the first four numbers = the week and year.
14th week of 1989
The serial # you give matches the older Climate-MAster that went out of business in 1990 and has no relationship to Climate-Master USA.
After 1972 the first two digits indicate the age = 1988
I don’t have any info on Enercon - sorry.
018 would be a 1½ ton unit.
You need a Carrier De-coder Ring!
Verify Age Of A Mcquay Heat Pump