How Many Watts Does This System Use? - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 03-20-2013, 10:40 AM   #1
Join Date: Oct 2008
Location: Connecticut
Posts: 59
Rewards Points: 75

How many watts does this system use?

Hello I need help deciphering the labels on this HVAC system. I want to know how many watts/hr this system consumes when operating in cooling mode. The end goal here is to get a few ballpark numbers on potential energy savings if we reducing our cooling load by upgrading our halogen lighting to LED.

The air handler label lists the following information

Magic Aire
Model No. 048-DUX-A-44HW
Motor Volt 115
Phase 1
Hz 60
HP 3/4
FLA 7.00
Minimum Supply Circuit Ampacity, Cir1 8.75
Maximum Fuse Size, Cir1 15

The compressor unit lists the following

York Stellar
Model No. H1DB042506B
Unit Supply 208/230V 1PH 60HZ
Min CKT Ampacity 27.2
Max Time Delay Fuse (UL) 40 AMPS (CSA) 40 AMPS
Max NACR Type CKT Breaker (UL) 40 AMPS
Max Circuit Breaker (CSA) 40 AMPS
Compressor 208/230V 1PH 60HZ 20.5RLA 120LRA
Fan Motor 208/230V 1PH 60HZ 1.6FLA 3.8LRA

I know volts*amps = watts, but I'm not really sure what the amps are based on these labels.


nowwhatnapster is offline   Reply With Quote
Old 03-20-2013, 12:55 PM   #2
Hvac Pro
yuri's Avatar
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 16,025
Rewards Points: 188

With the first unit it is 7 x 115 = watts

with the 2nd unit it is 230 x 20.5
plus 230 x 1.6

we use fla full load amps or rla running load amps, same thing different terms, potatoe/potato

halogen lighting is like running a heat lamp and I would seriously avoid it. unfortunately 10 yrs ago LED lighting did not exist and halogen gave tremendous light for a very small bulb with lots of heat. go LED anyway.


"Cut it twice and it is still too short".

Last edited by yuri; 03-20-2013 at 12:59 PM.
yuri is offline   Reply With Quote
Old 03-20-2013, 04:24 PM   #3
An old Tradesmen
Join Date: Oct 2008
Location: Somewhere
Posts: 34,421
Rewards Points: 7,832

Easyway. is to just check the watt rating of the halogen. Then subtract the watt consumption of the LED's your thinking of using. What ever that comes out to, multiply by 3.413. That is how many BTUs you won't use any more.
beenthere is offline   Reply With Quote

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
Old low voltage lighting system - switches stopped working. zepman Electrical 14 02-17-2016 07:18 PM
A strange one - polybutelene piping used in radiant heating system GordCooper Plumbing 4 03-13-2012 10:09 PM
Need advice RE: purging air from baseboard hot water heating system mikenri HVAC 2 01-19-2011 07:17 PM
beware humidity system? Emaderton3 HVAC 5 02-10-2010 11:52 PM
Size A/C system properly 70stang HVAC 1 03-26-2006 07:22 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1