EcoRenovator  

Go Back   EcoRenovator > Improvements > Conservation
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 03-28-15, 09:43 AM   #1
gtojohn
Journeyman EcoRenovator
 
gtojohn's Avatar
 
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
Default hvac transformers vampire load

Ive been thinking about this lately but havent put a meter on any to confirm. The average gaa furnac . Xfrmer is rated at 40va, air handlers are usually 60va if theres a zone control teir might be another Xfrmer too. Since i have 2 hvacs my units cpuld be using 80 watts just sitting there 24/7 waiting on thermostat . Im pretty sure 1 40va Xfrmer should be enough to run both which could yield some easy daily power savings. My other thought would be a line voltage master thermostat to turn off the systems when the house is in the butter zone of comfort. I have a slightly more ambitious plan instead. Solar powering the Xfrmers. Not sure if the control boards will allow this power to be different from house power and equipment power and phasing. I recently picked up a 20 watt panel and charge controller. I might try to pair it with a sla battery and tiny inverter i have. Hopefully i won't smoke the control board.

gtojohn is offline   Reply With Quote
Old 03-29-15, 08:52 AM   #2
Daox
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,475
Thanks: 1,112
Thanked 369 Times in 300 Posts
Default

Let us know what you find out.

I think I tested my furnace quite a while back and the phantom load it was drawing wasn't all that bad. That being said, I still turn it off in summer when heat isn't needed.
__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline   Reply With Quote
Old 03-29-15, 12:53 PM   #3
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 58 Times in 54 Posts
Default

Standby loss would be about 2% of rated VA
buffalobillpatrick is offline   Reply With Quote
Old 04-11-15, 12:49 PM   #4
Servicetech
Apprentice EcoRenovator
 
Servicetech's Avatar
 
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
Default

Standby loss is about 5W when furnace board is included.
Servicetech is offline   Reply With Quote
The Following User Says Thank You to Servicetech For This Useful Post:
Daox (04-13-15)
Old 04-16-15, 09:23 AM   #5
gtojohn
Journeyman EcoRenovator
 
gtojohn's Avatar
 
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
Default

I've been putting my amp meter on a few, I haven't found much. It did occur to me that heat pumps and electric air handlers which are usually paired with heat pumps usually have a 60va transformer. More importantly the reversing valve solenoid is always energized depending on the season. Blue wire 'b' terminals energize for heating, orange 'o' terminal units energize for cooling. Most/all thermostats keep the valve energized as long as your system mode is switched to the appropriate heat or cool. I haven't amped one but I know the solenoid coils can get crazy hot. This loss could be prevented with a relay activated by the y terminal.
gtojohn is offline   Reply With Quote
Old 04-16-15, 09:37 AM   #6
gtojohn
Journeyman EcoRenovator
 
gtojohn's Avatar
 
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
Default

BTW there are new DOE standards rolling out. I believe hvac transformers will go down to 32va. Central split hvac minimum efficiency hvac south of the mason dixon line will be 14 seer. California, Nevada and AZ will be 14 seer with eer 11.7. Northern states will require 90% afue furnaces. What I've heard is manufactures can sell out their stock of non complying units until June of 2016.
gtojohn is offline   Reply With Quote
Old 04-16-15, 03:11 PM   #7
Servicetech
Apprentice EcoRenovator
 
Servicetech's Avatar
 
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
Default

DOE would require switching power supplies if they really cared about efficiency. 24VAC contactors will work fine with 12VDC.
Servicetech is offline   Reply With Quote
Old 04-16-15, 09:51 PM   #8
where2
DIY Geek
 
Join Date: Apr 2013
Location: Sunny Florida
Posts: 399
Thanks: 72
Thanked 83 Times in 73 Posts
Default

Quote:
Originally Posted by gtojohn View Post
BTW there are new DOE standards rolling out. I believe hvac transformers will go down to 32va. Central split hvac minimum efficiency hvac south of the mason dixon line will be 14 seer. California, Nevada and AZ will be 14 seer with eer 11.7. Northern states will require 90% afue furnaces. What I've heard is manufactures can sell out their stock of non complying units until June of 2016.
Oh good, the rest of the southern world will soon catch up to the efficiency of the 3.5 ton Carrier I purchased in 1998!
where2 is offline   Reply With Quote
The Following User Says Thank You to where2 For This Useful Post:
Servicetech (04-17-15)
Old 04-17-15, 06:21 AM   #9
Servicetech
Apprentice EcoRenovator
 
Servicetech's Avatar
 
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
Default

I government really wanted to reduce energy use they would stop subsidizing energy companies. Energy subsidies keeps utility bills artificially low and discourage conservation.
Servicetech is offline   Reply With Quote
Old 04-17-15, 08:48 AM   #10
gtojohn
Journeyman EcoRenovator
 
gtojohn's Avatar
 
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
Default

What I see as the main benefit is apartment housing and commercial properties being forced to improve. For most of us in our own homes its a no brainer. For rentals it seems energy cost is something to pass the buck to tenants while the owners get by with the cheapest solutions. The usual cost difference between 13 and 14 seer is $200-300. Over the lifetime of 12-20 years that can be a huge difference in operating cost differed.

gtojohn is offline   Reply With Quote
Reply


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

Forum Jump


All times are GMT -5. The time now is 03:50 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design