Tony Hwang wrote: "- show quoted text - Sounds funny, then your system will blow cool air before warm air start blowing out. "
Ever hear of a 'return' in a force air system? That should engage first, before the hot end of things does.
The 'anticipator' lives on the stat. Not in the system. 'Lowest' setting. It is still between the gas valve and the valve's power source. That is the specific issue.
Peter Wieck Melrose Park, PA
For the record, 99-44/100ths of all residential forced air systems do not, repeat!, do not have an independently forced return. They are closed syste ms with what is best described as a "plenum" (central) return. Usually it i s a large floor duct somewhere near the furnace. Essentially, it is the ma ke-up air for the supply.
There is a great deal of bad information out there. Please DO try to verif y any information from a reliable source before taking any irreversible act ion(s).
Peter Wieck Melrose Park, PA
- show quoted text -"
Most of us here know where the anticipator is located.
g. It is still between the gas valve and the valve's
They do. But, not to be snarky, there are vanishingly few residential syst ems out there with forced returns. Few, even in commercial forced air syste ms. I was involved ONCE (1 time) with a system that had fully ducted supply and returns, this in an academic building of 425,000 square feet. It also had oxygen and CO2 sensors in the classrooms, ran on a VAV based system usi ng constant-velocity variable-vane axial fans on both the supply and return s. It was a high-volume, low pressure system to reduce noise and maintain h igh air quality. It could vary from a minimum of 10% 'new' air to 100% new air. That, for the record, is the only forced-return system that I have bee n directly involved with - others exist, I am sure - but mostly in commerci al/institutional applications, and most of those also VAV based.
Peter Wieck Melrose Park, PA
93%. It's 30 years old, no digital controls. There's a standard fan/limit thermal switch, but it only turns the blower off.
For perhaps 30 seconds or so, then the secondary heat exchanger starts warming the air while the primary is heating up.
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