I've tried researching the topic but have not had any luck and so hoping someone may shed some light on the issue (or hopefully non-issue).
2 1/2 years ago I moved into our new home which also has a Carrier Infinity furnace. I had an installer add an Infinity thermostat as well. This winter (and last winter) I've noticed that when there is a call for heat, the system goes through it's pre-cycle and then before the actual circulating fan kicks up to a higher speed there is a noticeably loud clack. It occurs frequently and is actually a little annoying (and partially distressing).
I complained to the builder while we were in warranty, and the tech from the installation company said the noise was normal, yet I've never heard a Furnace make such a noticeably loud noise and I'm a little dubious from previous experience with my builder (and subcontractors).
If I had to describe the sound, it's almost like a valve slamming shut (or perhaps a large solenoid clacking shut), but I honestly don't know as I'm not a tech. I'm stuck between my paranoia and calling a third party company out only to concur with what the builders company says (spending money) vs. leaving it and encountering a more serious issue.
As a note, there is an Air Exchanger installed as well that I leave running 24/7 on low and the noise does not occur during the summer with our AC.
In the end, is it normal for the Carrier Infinity Furnaces to have a louder then usual heating cycle?
Thanks for any help / input.