COMMUNITY FORUM

gjmcshea

10:56AM | 11/11/05
Member Since: 12/06/04
3 lifetime posts
Bvhvac
Hi,

Our funance (a 100,000 btu Lennox conservator III installed in 1987) has been cycling on and off in short cycles, apparently for a very long time though we just noticed the problem recently. Our house is a 1956 single story ranch in northern CA (1700 SF).

The service rep who came out concluded that the return air duct is undersized causing the furnace to overheat, hence the short cycling. He said the ingnitor and control panel are OK. He demonstrated the problem to me by removing the panels from the front of the blower & burner compartments (giving the furnace unlimited intake air) and the short cycling stopped.

The existing return duct is 10" and runs through the attic along a central hallway, then steps up to 14" in the garage where the furnace is. The service rep said the return duct should at least be 14" and more likely 20".

I guess my questions are:

1. Does this diagnosis sound correct?

2. Given the age of the furnace and the return duct problem he suggested we consider a new furnance rather than just getting the duct work re-done. He says the existing 100,000 btu unit is oversized for our 1700 SF house and that all the short cycling over a long period has likely taken a toll on the furnace. Does this sound reasonable or should we just get the duct work done?

Thanks very much in advance,

Greg

gjmcshea

08:51AM | 11/14/05
Member Since: 12/06/04
3 lifetime posts
Thank you!
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

captcha
type the code from the image

Anonymous

Post_new_button or Login_button
Register

Oversize windows let the outside in, even in a cozy cottage bathroom like this one. A roller screen and wraparound shower ... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp1