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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by Bill on April 10, 2007, 2:12 pm
I'm hoping I can get an explanation about SEER that makes sense.
Here's
my situation. I am going to have a Trane XL19i compressor added to
my
existing Trane XV90 heating system (the brand and particulars don't
really
matter...). I am going to have the HVAC work done by a pro, but I
want
to run the electric myself. I am trying to understand the electric
load in
some detail and it just doesn't add up.
I am considering a 36kBTU (3 ton) compressor. The spec sheet says
that it needs a 30A 220V dedicated circuit (which is fine...), but I
am
trying to figure out what the *true* load on the subpanel will be.
The spec
sheet says that the max compressor draw is 15.1A and that the max fan
draw is 2.8A. So, I figure that when the unit is running wide open
it
can be drawing 17.9A.
Here's my confusion. 36000BTU/19SEER = 1895watts. At 220V this
implies 8.6A. What's up with this?
I came up with a number of possibilities:
*the 15.1A on the compressor load is the inrush current at startup
*the compressor never runs at 100% duty cycle (this makes no sense to
me).
What I want to know is when the compressor and fan are already
running
(that is neglecting any startup transients) how much current will this
unit
(compressor plus fan) be drawing from my subpanel.
Any help much appreciated.
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Posted by on April 10, 2007, 2:27 pm
>I'm hoping I can get an explanation about SEER that makes sense.
>Here's
>my situation. I am going to have a Trane XL19i compressor added to
>my
>existing Trane XV90 heating system (the brand and particulars don't
>really
>matter...). I am going to have the HVAC work done by a pro, but I
>want
>to run the electric myself. I am trying to understand the electric
>load in
>some detail and it just doesn't add up.
>
>I am considering a 36kBTU (3 ton) compressor. The spec sheet says
>that it needs a 30A 220V dedicated circuit (which is fine...), but I
>am
>trying to figure out what the *true* load on the subpanel will be.
>The spec
>sheet says that the max compressor draw is 15.1A and that the max fan
>draw is 2.8A. So, I figure that when the unit is running wide open
>it
>can be drawing 17.9A.
>
>Here's my confusion. 36000BTU/19SEER = 1895watts. At 220V this
>implies 8.6A. What's up with this?
>
>I came up with a number of possibilities:
>*the 15.1A on the compressor load is the inrush current at startup
>*the compressor never runs at 100% duty cycle (this makes no sense to
>me).
>
>What I want to know is when the compressor and fan are already
>running
>(that is neglecting any startup transients) how much current will this
>unit
>(compressor plus fan) be drawing from my subpanel.
>
>Any help much appreciated.
Fucking here's an idea -
Look up 'RLA' for unit in the spec sheet.
Find out what the manufacturer says is 'required circuit
ampacity'. Look it up in 310-16 and fucking stop trying to get
creative about it.
If you don't know what that number 310-16 means - fucking call
an electrician and have him do that work.
--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/
Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/
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Posted by Bill on April 10, 2007, 7:08 pm
On Apr 10, 11:27 am, .p.jm@see_my_sig_for_address.com wrote:
>
>
>
>
>
> >I'm hoping I can get an explanation about SEER that makes sense.
> >Here's
> >my situation. I am going to have a Trane XL19i compressor added to
> >my
> >existing Trane XV90 heating system (the brand and particulars don't
> >really
> >matter...). I am going to have the HVAC work done by a pro, but I
> >want
> >to run the electric myself. I am trying to understand the electric
> >load in
> >some detail and it just doesn't add up.
>
> >I am considering a 36kBTU (3 ton) compressor. The spec sheet says
> >that it needs a 30A 220V dedicated circuit (which is fine...), but I
> >am
> >trying to figure out what the *true* load on the subpanel will be.
> >The spec
> >sheet says that the max compressor draw is 15.1A and that the max fan
> >draw is 2.8A. So, I figure that when the unit is running wide open
> >it
> >can be drawing 17.9A.
>
> >Here's my confusion. 36000BTU/19SEER = 1895watts. At 220V this
> >implies 8.6A. What's up with this?
>
> >I came up with a number of possibilities:
> >*the 15.1A on the compressor load is the inrush current at startup
> >*the compressor never runs at 100% duty cycle (this makes no sense to
> >me).
>
> >What I want to know is when the compressor and fan are already
> >running
> >(that is neglecting any startup transients) how much current will this
> >unit
> >(compressor plus fan) be drawing from my subpanel.
>
> >Any help much appreciated.
>
> Fucking here's an idea -
>
> Look up 'RLA' for unit in the spec sheet.
>
> Find out what the manufacturer says is 'required circuit
> ampacity'. Look it up in 310-16 and fucking stop trying to get
> creative about it.
>
> If you don't know what that number 310-16 means - fucking call
> an electrician and have him do that work.
>
> --
> Click here every day to feed an animal that needs you today
!!!http://www.theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available onlinehttp://pmilligan.net/palm/- Hide quoted text -
>
> - Show quoted text -
Well, I have to say that this is the most useful reply I have ever
read.
Here I thought it might boil down to duty cycle, or power factor, or
some other
nuance. But no, it is apparently all related to "fucking". Boy, am I
relieved.
If I do hire an electrician, I will make sure that he is as
intelligent and articulate
as Paul here.
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Posted by on April 11, 2007, 6:52 pm
>On Apr 10, 11:27 am, .p.jm@see_my_sig_for_address.com wrote:
>>
>>
>>
>>
>>
>> >I'm hoping I can get an explanation about SEER that makes sense.
>> >Here's
>> >my situation. I am going to have a Trane XL19i compressor added to
>> >my
>> >existing Trane XV90 heating system (the brand and particulars don't
>> >really
>> >matter...). I am going to have the HVAC work done by a pro, but I
>> >want
>> >to run the electric myself. I am trying to understand the electric
>> >load in
>> >some detail and it just doesn't add up.
>>
>> >I am considering a 36kBTU (3 ton) compressor. The spec sheet says
>> >that it needs a 30A 220V dedicated circuit (which is fine...), but I
>> >am
>> >trying to figure out what the *true* load on the subpanel will be.
>> >The spec
>> >sheet says that the max compressor draw is 15.1A and that the max fan
>> >draw is 2.8A. So, I figure that when the unit is running wide open
>> >it
>> >can be drawing 17.9A.
>>
>> >Here's my confusion. 36000BTU/19SEER = 1895watts. At 220V this
>> >implies 8.6A. What's up with this?
>>
>> >I came up with a number of possibilities:
>> >*the 15.1A on the compressor load is the inrush current at startup
>> >*the compressor never runs at 100% duty cycle (this makes no sense to
>> >me).
>>
>> >What I want to know is when the compressor and fan are already
>> >running
>> >(that is neglecting any startup transients) how much current will this
>> >unit
>> >(compressor plus fan) be drawing from my subpanel.
>>
>> >Any help much appreciated.
>>
>> Fucking here's an idea -
>>
>> Look up 'RLA' for unit in the spec sheet.
>>
>> Find out what the manufacturer says is 'required circuit
>> ampacity'. Look it up in 310-16 and fucking stop trying to get
>> creative about it.
>>
>> If you don't know what that number 310-16 means - fucking call
>> an electrician and have him do that work.
>
>Well, I have to say that this is the most useful reply I have ever
>read.
>
>Here I thought it might boil down to duty cycle, or power factor, or
>some other
Nothing at all to do with it.
>nuance. But no, it is apparently all related to "fucking". Boy, am I
>relieved.
>
>If I do hire an electrician, I will make sure that he is as
>intelligent and articulate
>as Paul here.
That's right.
He will FUCKING do it right, and he will FUCKING do it to
code, and he will FUCKING follow the instructions instead of trying to
make them up as he goes along, and he won't FUCKING cut corners to
save a nickel, and this won't be the first FUCKING one he's ever done,
and that way your FUCKING house won't FUCKING burn down.
You fucking asshole.
--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/
Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/
|
|
Posted by B-Hate-Me on April 12, 2007, 2:14 pm
>
> He will FUCKING do it right, and he will FUCKING do it to
> code, and he will FUCKING follow the instructions instead of trying to
> make them up as he goes along, and he won't FUCKING cut corners to
> save a nickel, and this won't be the first FUCKING one he's ever done,
> and that way your FUCKING house won't FUCKING burn down.
>
> You fucking asshole.
Fucking A
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