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

In many regions, the growing season has already begun to wind down, so it's time to figure out where you're going to store... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... 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... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp2