How much of a pressure drop is that. How much would that extra resistance
raise the TD?

--
Bob Pietrangelo


www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist




"stretch" wrote in message
ups.com...
What kind of filter do you have? The home centers are selling lots of
pleated filters like the 3M Filtrete. These filters have more pressure
drop and resistance to air flow than a fiberglass filter dirty enough
to grow seedlings in it. you could have a problem with low airflow
tripping the high limit switch. Put in a clean fiberglass filter and
try again. Messing with the heat anticipator is for professionals that
can measure the results. Make sure the registers in all rooms are
open. People sometiumes close them "to save money" and reduce airflow
in the system. Low airflow can ruin equipment.


stretch