Comfortmaker serial age
Manufacture date from the rating-plate serial. Same family as Heil, Arcoaire, Airquest. A printed MFR date on the plate still wins.
Comfortmaker
Type the serial off the rating plate. Spaces and hyphens are ignored. Manufacture date is not the install date.
Diagnose this call
Age is open. The walkthrough is the seat.
Where the plate is
ICP-family. Some plants encode month in positions 4–5, some encode week.
Styles
Current
R921500600
Letter + year + week. R9215… = 1992 week 15.
Same date-code family: Heil, Tempstar.
Cross-checked against Comfortmaker HVAC age. FieldBench does not host or republish that page. Letter charts we could not verify are linked out instead of invented.