Furnace Fan Power Consumption? - Electrical - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Furnace fan power consumption?
 User Name Remember Me? Password
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

 Thread Tools Display Modes
04-17-2010, 05:52 AM   #1
Member

Join Date: Nov 2008
Location: CA
Posts: 335
Rewards Points: 278

## Furnace fan power consumption?

Does anyone know how much electricity is consumpted approx. by the blower fan? Does it run off the 220V circuit or is it the 110V furnace breaker circuit?
Does not count freon compressor.

04-17-2010, 07:12 AM   #2
Member

Join Date: Dec 2008
Location: Wilmington, DE
Posts: 3,118
Rewards Points: 2,000

Most forced hot air furnaces run on 115, heat pumps and A/C compressors run on 240, but the fan that delivers the air run on 115. Motors vary depending on the age of the unit, older units are not as energy efficient. Many modern muti-speed heaters run on DC voltage. There should be a plate on the heater somewhere that tells the power draw in amps. Power consumption in watts(P)= voltage(E) x current(I). That is a rough answer because AC voltage works differently than DC. But roughly, a motor that draws 5Amps consumes 575Watts.

 04-18-2010, 02:43 AM #3 Member   Join Date: Nov 2008 Location: CA Posts: 335 Rewards Points: 278 So how much power does a typical compressor itself draws? it's on a 30amp 220V breaker.
 04-18-2010, 05:06 AM #4 " Euro " electrician     Join Date: Apr 2006 Location: WI & France { in France for now } Posts: 5,369 Rewards Points: 2,000 For the air handling unit { indoor unit } if straght A/C unit typically the motour useally wired for 240 volts and the motor size will varies a bit depending on how big the unit itself some are at 1/3 and some are on 1/2 and few case at 3/4 HP setting. But if you have furance with A/C coil on it then the motor useally be on 120 volts due there are other couple motours in there. for motour size it the same as I mention above. Now for outdoor freon compressour unit that will varies a bit by tonnage size and how effect the unit it is. The key item is look at the nameplate on the unit it will have all the info there and some of them will list the running amps on there. Merci,Marc
 04-19-2010, 01:35 PM #5 Member   Join Date: Nov 2008 Location: CA Posts: 335 Rewards Points: 278 I look at the compressor and see some FLA numbers (1, 1.3 etc) but it says minimum amp 17amps that's 240V*17amps minimum when it runs? I am trying to compare the consumption of a whole house fan vs an A/C system. But the furnace blower itself is almost as much power as the whole house fan itself. However I don't think an A/C runs constantly in an hour. maybe switch on 5-6 times depends how fast the room is heating up again.
04-19-2010, 02:00 PM   #6
Member

Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post daddyrabbit HVAC 2 02-12-2010 11:09 PM JoBlowHomeOwner HVAC 6 10-17-2009 10:05 PM RammsteinNicCage Appliances 6 06-13-2008 11:50 PM tuasoi Electrical 13 11-29-2007 01:53 PM tuasoi General DIY Discussions 4 11-29-2007 01:50 PM

Top of Page | View New Posts