Home Page link

do high-end residential heat pumps with variable speed air handlers truly vary the speed to control humidity?

Home| Search | About
Login Password
Register Now! Lost Password?

HVAC Discussions - Heating, ventilation and air conditioning. 

Page 3 of 5       < 1 2 3 > last >> Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
do high-end residential heat pumps with variable speed air handlers truly vary the speed to control humidity? David Jensen 05-09-2007
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by Tony on May 10, 2007, 7:02 pm

>
>>
>>
>><snip>
>>
>>> In this case, the Air Handler is a Lennox CBX-32-MV-048-2306 and the
>>> Condensor is a Lennox XP19-036-230-02 with an HSPF of 9.3 and SEER of
>>18.6.
>>> You see that this is a 4-ton air handler and a 3-ton condensor unit. It
>>is
>>> my understanding that by "mismatching" the two that you can effectively
>>> increase the efficiency. Is that correct?

increase in efficiency by having condenser of 4 ton and air handler of 3 ton
NOT in MILLION years! you contractor maybe good janitor if that.
not only will you have poor efficiency but you RH in house will be
unbearable
I am not AC person but you better believe what I just told you.
Tony


>><snip>
>>
>>If you want to control humidity, you sure as hell don't over size the
>>evaporator! That's going in the WRONG direction.
>>
>>After reading the rest of your post, it's unfortunate, but your HVAC
>>contractor is out in left field. I would suggest that you find a
>>competent,
>>reliable tech that is familiar with your Lennox equipment and have them go
>>over the complete system and set it up properly and locate any other
>>problems that may not have been diagnosed.
>>
>
> I for one would love to see David post the ARI number for the
> mismatched system......without such ARI certification number his
> system is probably 10 seer at best.
>
> What size is the lineset?



PexSupply Save 10 468x60
Posted by on May 10, 2007, 9:47 pm

>
> >
> >>
> >>
> >><snip>
> >>
> >>> In this case, the Air Handler is a Lennox CBX-32-MV-048-2306 and the
> >>> Condensor is a Lennox XP19-036-230-02 with an HSPF of 9.3 and SEER of
> >>18.6.
> >>> You see that this is a 4-ton air handler and a 3-ton condensor unit.
It
> >>is
> >>> my understanding that by "mismatching" the two that you can
effectively
> >>> increase the efficiency. Is that correct?
>
> increase in efficiency by having condenser of 4 ton and air handler of 3
ton
> NOT in MILLION years! you contractor maybe good janitor if that.
> not only will you have poor efficiency but you RH in house will be
> unbearable
> I am not AC person but you better believe what I just told you.
> Tony


He said AH is 4-ton and cond is 3-ton.

Which usually increases the efficiency, but kills humidity removal.




Posted by David Jensen on May 11, 2007, 5:58 pm
>
>>
>>
>><snip>
>>
>>> In this case, the Air Handler is a Lennox CBX-32-MV-048-2306 and the
>>> Condensor is a Lennox XP19-036-230-02 with an HSPF of 9.3 and SEER of
>>18.6.
>>> You see that this is a 4-ton air handler and a 3-ton condensor unit. It
>>is
>>> my understanding that by "mismatching" the two that you can effectively
>>> increase the efficiency. Is that correct?
>>
>><snip>
>>
>>If you want to control humidity, you sure as hell don't over size the
>>evaporator! That's going in the WRONG direction.
>>
>>After reading the rest of your post, it's unfortunate, but your HVAC
>>contractor is out in left field. I would suggest that you find a
>>competent,
>>reliable tech that is familiar with your Lennox equipment and have them go
>>over the complete system and set it up properly and locate any other
>>problems that may not have been diagnosed.
>>
>
> I for one would love to see David post the ARI number for the
> mismatched system......without such ARI certification number his
> system is probably 10 seer at best.
>
> What size is the lineset?

OK, I finally got the ARI certification reference number for this system and
it is: 551503. The ARI directory shows the pair with a SEER of 18.6. I do
not know the lineset size, however, as I am not at the site location.

David



Posted by David Jensen on May 11, 2007, 6:11 pm
>
> I for one would love to see David post the ARI number for the
> mismatched system......without such ARI certification number his
> system is probably 10 seer at best.
>
> What size is the lineset?

One other interesting point to note. regarding the ARI certification of this
unit. As installed with a 3 ton condensor and 4 ton air handler (ARI
reference # 551503) the unit is rated at 18.6 SEER. I looked for and found
the certification number for the same 3 ton condensor matched with the same
model air handler, except at 3 tons instead of 4 (ARI reference # 551667)
and the SEER rating for that matched set is only 17.75. Still good and
efficient, but less than the 18.6 obtained by oversizing the air handler.
As long as you slowed the fan down on the four ton unit to match the
condensor, it seems like it would even do better at lowering humidity. Am I
thinking straight on that one?

David



Posted by Jake on May 11, 2007, 7:39 pm
David Jensen wrote:
>> I for one would love to see David post the ARI number for the
>> mismatched system......without such ARI certification number his
>> system is probably 10 seer at best.
>>
>> What size is the lineset?
>
> One other interesting point to note. regarding the ARI certification of this
> unit. As installed with a 3 ton condensor and 4 ton air handler (ARI
> reference # 551503) the unit is rated at 18.6 SEER. I looked for and found
> the certification number for the same 3 ton condensor matched with the same
> model air handler, except at 3 tons instead of 4 (ARI reference # 551667)
> and the SEER rating for that matched set is only 17.75. Still good and
> efficient, but less than the 18.6 obtained by oversizing the air handler.
> As long as you slowed the fan down on the four ton unit to match the
> condensor, it seems like it would even do better at lowering humidity. Am I
> thinking straight on that one?
>
> David
>
>

Do a FanHandler, David. Google it. These units are more reliable and
less expensive than OEM solutions like ECM motors.

If you're in the biz, you can buy one wholesale. Otherwise, you'll have
to find a contractor that will sell you one.

I've installed over 60 now, and all my customers are happy. We even have
them on our McQuay units in our own new building.

Just my 2 cents.

Jake

Page 3 of 5       < 1 2 3 > last >>
Similar ThreadsPosted
Variable Speed residential motors ; too long a payback ?? June 10, 2007, 12:58 pm
Trane Variable Speed Furnace October 30, 2007, 11:20 pm
Tech question about variable speed compressors... May 31, 2007, 12:57 pm
Furnaces with AFUE of over 90 percent: variable speed motors November 1, 2006, 3:14 pm
Trane Variable Speed Air Handler - setting fan speeds February 19, 2007, 9:51 am
Carrier variable speed motor, duct transitions - any problems? September 14, 2006, 4:01 pm
Does anyone make a Muti-speed compressor for residential ? May 20, 2007, 6:12 pm
HELP I need 2 new furnaces!! Single or dual 80% or 90% single or variable speed fan September 10, 2006, 7:57 pm
GE Fan Motor has low speed only August 24, 2006, 2:00 am
Honeywell Humidicalc Recommended Instead of Outdoor Sensor? (Automatic Humidity Control) May 23, 2007, 1:20 pm

Contact Us | Privacy Policy

XML SitemapXML Sitemap