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Subject Author Date
Need your expertise Jean 02-19-2009
---> Re: Need your expertise HateThatHeatPum...02-19-2009
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Posted by Jean on February 19, 2009, 10:37 am
Can you guys tell me if the data in the section:
GSZ130241A* / AR*F182416**
on page 18 of
http://www.goodmanmfg.com/Portals/0/pdf/SS-GSZ13.pdf
is strange for R410?

Look at the Hi/Lo pressures for outdoor ambient.

2 ton - 212/61 @ 40 deg ?

Compare to 1 1/2 ton - 318/96 and 3 ton - 297/86.


Posted by HateThatHeatPump on February 19, 2009, 4:56 pm
I compared 13 seer and 14 seer and here what I've got

It should be at 308/90 HI/Low

But I might be wrong also

Just check data for 14 seer here

http://www.goodmanmfg.com/Portals/0/pdf/ss-SSz14.pdf

Posted by Jean on February 19, 2009, 6:50 pm
On Thu, 19 Feb 2009 13:56:03 -0800 (PST), HateThatHeatPump

>I compared 13 seer and 14 seer and here what I've got
>It should be at 308/90 HI/Low
>But I might be wrong also
>Just check data for 14 seer here
>http://www.goodmanmfg.com/Portals/0/pdf/ss-SSz14.pdf

Thanks for input.

My HVAC tech says it should be about 350/100 or so for my heat pump.
He has stated to throw out Goodman sheets. I'm awaiting his return
right now to troubleshoot problem. He thinks unit was factory
overcharge as only 6 oz was added for additional line length.

Here's the response from Alpine when I questioned the strange specs in
three emails:

"The manufacturer's spec sheet is based of of ARI industry testing and
should be correct. You have to note that your pressures will vary
depending on your outdoor and indoor humidity along with the amount of
air flow and the and charge the system has. These specs indicate what
the correct pressures should be based on the delta T (or temperature
drop across the evaporator coil) and the outdoor temperature. If your
pressure seem off based on the outdoor temp, I would first look at
delta T to see if it's correct."

and

"The manufacturer's specs are to be used as a reference for what the
system pressures should be operating at. The difference in values
will not change how the system should be charged. According to the
install manual, the contractor will need to add 0.6 ounces of
refrigerant for every foot of liquid line further than 15 feet. Once
the additional refrigerant is added, the contractor will need to
perform a superheat or subcooling calculation to verify the unit is
operating and charged properly."

I gotta repeat this phrase:

" to be used as a reference for what the system pressures should be
operating at"

What the hell did he think I was using it for, except to do just that!

BTW, Alpine says the only way to add refrigerant is by weight in heat
mode. Tech says he has done superheat/subcooling check at 60 F but
would prefer 70 F.

It's 40 F here.....

I'm beginning to think the only solution to the noisy machine is to
sell tickets to a "heat pump bash".
$100 for the first swing with a baseball bat at the thing
$95 for the second
$90 for the third
etc etc
The person who puts it completely out of it's misery will get their
ticket money back.

Afterwords we'll take it out to the country and roast it on a huge
bonfire.

I know quite a few people who would just love to get their
frustrations out.

Posted by Bubba on February 19, 2009, 7:46 pm

>On Thu, 19 Feb 2009 13:56:03 -0800 (PST), HateThatHeatPump
>>I compared 13 seer and 14 seer and here what I've got
>>It should be at 308/90 HI/Low
>>But I might be wrong also
>>Just check data for 14 seer here
>>http://www.goodmanmfg.com/Portals/0/pdf/ss-SSz14.pdf
>Thanks for input.
>My HVAC tech says it should be about 350/100 or so for my heat pump.
>He has stated to throw out Goodman sheets. I'm awaiting his return
>right now to troubleshoot problem. He thinks unit was factory
>overcharge as only 6 oz was added for additional line length.
>Here's the response from Alpine when I questioned the strange specs in
>three emails:
>"The manufacturer's spec sheet is based of of ARI industry testing and
>should be correct. You have to note that your pressures will vary
>depending on your outdoor and indoor humidity along with the amount of
>air flow and the and charge the system has. These specs indicate what
>the correct pressures should be based on the delta T (or temperature
>drop across the evaporator coil) and the outdoor temperature. If your
>pressure seem off based on the outdoor temp, I would first look at
>delta T to see if it's correct."
>and
>"The manufacturer's specs are to be used as a reference for what the
>system pressures should be operating at. The difference in values
>will not change how the system should be charged. According to the
>install manual, the contractor will need to add 0.6 ounces of
>refrigerant for every foot of liquid line further than 15 feet. Once
>the additional refrigerant is added, the contractor will need to
>perform a superheat or subcooling calculation to verify the unit is
>operating and charged properly."
>I gotta repeat this phrase:
>" to be used as a reference for what the system pressures should be
>operating at"
>What the hell did he think I was using it for, except to do just that!
>BTW, Alpine says the only way to add refrigerant is by weight in heat
>mode. Tech says he has done superheat/subcooling check at 60 F but
>would prefer 70 F.
>It's 40 F here.....
>I'm beginning to think the only solution to the noisy machine is to
>sell tickets to a "heat pump bash".
>$100 for the first swing with a baseball bat at the thing
>$95 for the second
>$90 for the third
>etc etc
>The person who puts it completely out of it's misery will get their
>ticket money back.
>Afterwords we'll take it out to the country and roast it on a huge
>bonfire.
>I know quite a few people who would just love to get their
>frustrations out.

Ok,
Jean, Im probably going to hate myself for doing this, ESPECIALLY
since it seems you purchased it from alpine home air but here goes.
Since I wasnt completly paying attention and Im not going to search
back for it..............tell me again
What is the EXACT model and serial of the outdoor unit AND the indoor
unit.
When, approximately, was it installed.
Then I take it that your problem is noise during the defrost cycle?
Bubba

Posted by Jean on February 19, 2009, 10:13 pm
wrote:

>>On Thu, 19 Feb 2009 13:56:03 -0800 (PST), HateThatHeatPump
>>>I compared 13 seer and 14 seer and here what I've got
>>>It should be at 308/90 HI/Low
>>>But I might be wrong also
>>>Just check data for 14 seer here
>>>http://www.goodmanmfg.com/Portals/0/pdf/ss-SSz14.pdf
>>Thanks for input.
>>My HVAC tech says it should be about 350/100 or so for my heat pump.
>>He has stated to throw out Goodman sheets. I'm awaiting his return
>>right now to troubleshoot problem. He thinks unit was factory
>>overcharge as only 6 oz was added for additional line length.
>>Here's the response from Alpine when I questioned the strange specs in
>>three emails:
>>"The manufacturer's spec sheet is based of of ARI industry testing and
>>should be correct. You have to note that your pressures will vary
>>depending on your outdoor and indoor humidity along with the amount of
>>air flow and the and charge the system has. These specs indicate what
>>the correct pressures should be based on the delta T (or temperature
>>drop across the evaporator coil) and the outdoor temperature. If your
>>pressure seem off based on the outdoor temp, I would first look at
>>delta T to see if it's correct."
>>and
>>"The manufacturer's specs are to be used as a reference for what the
>>system pressures should be operating at. The difference in values
>>will not change how the system should be charged. According to the
>>install manual, the contractor will need to add 0.6 ounces of
>>refrigerant for every foot of liquid line further than 15 feet. Once
>>the additional refrigerant is added, the contractor will need to
>>perform a superheat or subcooling calculation to verify the unit is
>>operating and charged properly."
>>I gotta repeat this phrase:
>>" to be used as a reference for what the system pressures should be
>>operating at"
>>What the hell did he think I was using it for, except to do just that!
>>BTW, Alpine says the only way to add refrigerant is by weight in heat
>>mode. Tech says he has done superheat/subcooling check at 60 F but
>>would prefer 70 F.
>>It's 40 F here.....
>>I'm beginning to think the only solution to the noisy machine is to
>>sell tickets to a "heat pump bash".
>>$100 for the first swing with a baseball bat at the thing
>>$95 for the second
>>$90 for the third
>>etc etc
>>The person who puts it completely out of it's misery will get their
>>ticket money back.
>>Afterwords we'll take it out to the country and roast it on a huge
>>bonfire.
>>I know quite a few people who would just love to get their
>>frustrations out.
>Ok,
>Jean, Im probably going to hate myself for doing this, ESPECIALLY
>since it seems you purchased it from alpine home air but here goes.

Mea culpa. You won't beat on a guy when he's down, will you? ;)

>Since I wasnt completly paying attention and Im not going to search
>back for it..............tell me again
>What is the EXACT model and serial of the outdoor unit AND the indoor
>unit.

Goodman:
GSZ130241A heat pump - 2 Ton R410A w/ piston flowrator and aux heat
thermostat set at 25 F. (I added crankcase heater to prevent migration
and help with cold starts. Lowest recorded temp here was 15 F in 1955.
It got down to 20 or so for a week this winter.)

ARUF182416 air handler w/ piston flowrator - 3 speed fan w/ 5KW heat
strip.

(Don't have serial numbers handy but can get them tomorrow if
necessary)

>When, approximately, was it installed.

Oct 2008 - commissioned Nov 2008

>Then I take it that your problem is noise during the defrost cycle?
>Bubba

It sounded like this but is getting WORSE. I'm afraid it may be
slugging.
http://www.youtube.com/watch?v=9gfnmVB5q3c

The unit ran fairly quiet until recently. I'll take a video tomorrow
and upload to youtube.

Here's what I've checked out:

Airflow check using 5 KW aux heater strip w/o heat pump:
Air handler tested w/ ACTUAL measured voltage/current to strip:
237 VAC / 20.0 A = 4.74 KW
CFM = KW X 3514 X 1.08 / TR
Hi speed: 19 F temp rise 74 to 93 = 947 CFM
Mid speed: 21 F temp rise 72 to 93 = 857 CFM
I haven't measured static pressure but have provided a hole for HVAC
tech if he wanted to check. Hard to get at with downdraft unit. He
looked at my figures and install and seems satisfied.

These match figures I did at install time. I had the unit running good
on auxiliary heat for several weeks while waiting for HVAC guy to do
the brazing (used nitrogen), purge (500 micron) and 6 oz top up for
line length. He added filter w/o refrigerant addition.

Heat pump (about 40 F outdoor temp) w/o heat strip:
BTU = CFM x TR / 1.08
Using 856 CFM I came to 20,631 BTU for temp rise 72 to 98

New HVAC tech came and did a quick check several days ago. I'm
waiting for him to come back and start a full diagnoses. His first
plan of attack is to remove refrigerant.

Outside temp 40 - inside temp 72
Hi PR 410 / Lo PR 96
Discharge temp 158 and current 7.9 (these are from memory - might not
be correct - I didn't write them down).
The Hi PR dropped a bit when we upped fan speed.

This fellow is different from original installer who insists initial
unit pressures were OK and the current noise is "normal".
Unfortunately, I have no record of these. :(

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