JLC · AUGUST 1989
Getting the Kinks
Out of High-
A furnace technician tests the controls on a condensing furnace during an annual tuneup. Special training and knowledge of
electronics is needed.
The New Generation of Gas Furnaces
Won't Fall to Rust, but They
Will Need Extra Maintenance
by Frank Green
The hvac industry reacted quickly to
the "energy crunch" of the mid-1970s
by making major changes in natural-gas
furnace design. Perhaps they acted too
quickly, becuase the dramatic new
designs brought with them design
errors, recalls, and a host of complaints.
Contractors today have reason to be
concerned abut product reliability.
Most major manufacturers, however,
have gone through several generations
of design. With nearly a decade of field