no gas furnace back up on hybrid(heat pump)system - Residential HVAC Forum - HVACSite

no gas furnace back up on hybrid(heat pump)system

 
Thread Tools Display Modes
Old 04-20-2018, 06:22 PM   #1
Junior Member
 
tsl2166's Avatar
 
Trade: HVAC
Join Date: Apr 2018
Posts: 1
Default

no gas furnace back up on hybrid(heat pump)system


Working on a Carrier heat pump/gas backup with visionpro 8500 tstat. The furnace will not come on when backup heat is needed below 35 deg. outside ambient in normal heat mode. Furnace runs when set in emergency heat mode on tstat but not in heat mode. the tstat shows the outside temp. correct and shows its in emergency heat mode after the heat pump shuts off but furnace will not kick on. The heat pump works in heating and cooling. Never encountered this at any service call.

tsl2166 is offline  
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. HVACSite.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Old 04-30-2018, 08:02 PM   #2
Junior Member
 
bpalfy523's Avatar
 
Trade: residential service technician
Join Date: Apr 2018
Posts: 1
Default

Re: no gas furnace back up on hybrid(heat pump)system


If it's dual fuel with had backup. The furnace will not kick on and run as backup heat with the heat pump. Unlike electric strip heat as your backup,that runs with the heat pump. Running the furnace with the heat pump running would cause high pressure issues. You need to set the tstat to lockout the heat pump at your 35 degrees or whatever temp you desire and bring on the gas furnace alone. Usually don't even defrost with a gas furnace because itll get to hot. Have to make sure your settings are all correct in the tstat and it's a 3h/2c tstat. Hopefully this helps
Good luck

Sent from my SM-G928T using Tapatalk
bpalfy523 is offline  


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Top 3 Reasons to Buy a High Efficiency Furnace HVACPhilly Residential HVAC Forum 4 08-24-2018 01:33 PM
Why Does My Furnace Keep Running? HVACPhilly Residential HVAC Forum 0 01-09-2018 08:27 AM
What Should I Do If My Furnace Stops Working? HVACPhilly Residential HVAC Forum 0 12-30-2017 08:28 AM
HVAC Philly’s 7 Reasons Your Furnace May Not Be Kicking On; Heating Repair HVACPhilly Residential HVAC Forum 0 12-16-2017 08:25 AM
Important Factors in Furnace Installation AACHeatingCooling General HVAC Discussion 0 05-15-2017 10:07 AM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?

 

SEO by vBSEO 3.6.1