COMMUNITY FORUM

tpanc13

08:18AM | 01/15/07
Member Since: 01/14/07
2 lifetime posts
Bvhvac
The house I bought has a Comfortmaker Heat Pump and a Lennox gas furnace combination controlled by a Lemmox FM21 and Lennox thermostat; refrigerant coil on "heat" side of furnace. I was under the impression that when the temperature was below 40-degrees, the AUX Heat light would display (it does), the gas furnace would light (it does), and the Heat Pump would shut down (it doesn't). First, should the heat pump turn off when in AUX heat mode?

Second, I was also told I could use the gas furnace exclusively without the heat pump by switching to Emergency mode. I did so while in AUX mode (Heat Pump and Gas furnace on) and it did shut down the heat pump. However, when the heat cycle ended and restarted later, STILL in Emergency mode, the heat pump restarted! Am I correct that I should be able to run gas furnace exclusively by switching to Emergency mode? If so, what is wired incorrectly? Any help would be appreciated. Thank you.

Thanks ... Rich

tpanc13

12:39PM | 01/26/07
Member Since: 01/14/07
2 lifetime posts
Thanks for your reply, although it is not completely understood. I assume when you suggest to keep HP running during the winter, you mean don't turn thermostat to Emergency Heat which shuts down HP BOTH above 40-degrees AND below 40-degrees. If so, I am comfortable with your answer. This is different from Auxillary Heating where the Lennox FM21 Control between gas furnace and HP should turn the HP on above 40-degrees and let it OFF when outside temperature is under 40-degrees using the gas furnace instead.

Anyway, I did remove the "hard-wire patch" some installer did that always kept the HP running regardless of the outside temperature. Now my system runs as designed, or at least how the FM21 controls says it should run, i.e., above 40-degrees run HP only and under 40-degrees run gas furnace only.

End result as far as starting and stopping the compressor to me seems to be the elimination of the number of starts and stops when the temperature outside is under 40-degrees -- that should be good as your answer implies.

If I am completely off base, please advise.

Thanks again.

Thanks ... Rich
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

Painting your front door a striking color is risky, but it will really grab attention. Picking the right shade (and finish... 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... For windows, doors, and mirrors that could use a little definition, the Naples Etched Glass Border adds a decorative flora... 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
 
webapp2