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Thanks for the replies. I'm done

Some knowledge. Thanks.

With all the hammering you guys, the powers that be, do, about getting the
Manuals J,D, and sometimes S, forgive me when I have a question that deviates from what has...

Thankx dash.

I am under the assumption that the length(s) of the ducting is part of, not just the reason, of the Man D to help get the airflow down to the rooms requirement.

As dash mentioned,...

The operative word in the opening post is, length. Duct diameter is not going to be reduced. Defeats the purpose. I need that diameter to get the air into the room (s).

Can I cut down on the...

The TEL is set from the Manual D. I need to chop that way down to make it fit in my small arse attic. I would have ducting criss-crossing, blocking egress, etc.

Is this doable or should I...

First I must say that getting a few Manual J's and D's gives peace of mind.

I've been going over the ducting, comparing the design(s) of each. I see that the ducting has a column for TEL. Also...

So, are you able to do the Manual J as well as the Manual D? You might want to add contact info to your profile.

Since this is the Residential Forum, I'm thinking HO's such as myself would use...

This HO lives in a mild climate. Rarely into the low 30's. Usually upper 30's to low 40's for a low during winter.

This our third heating season with Heat Pump. Finally getting used to its...

This HO gets 120* at the farthest register when both are running.

Our situation is similar. In my case, using a White-Rodgers Heat Pump T-stat,
I have it set for 1/2* on-off. It can also be set for 1 1/2*, IIRC, maybe 2.

I have not had the inside temp drop...

Old Lennox. I, as a stoopid homeowner searching for the truth, would do another calc with your desired temps. My three paid Man J's used 75 on cool and 70 on heat. May be a industry standard.

I'm reading the opening post with the same interest I have ( had ) with our home. At first, 3 tons seemed too large for our house. Did five load calcs and came up with a comfortable average number....

Not yet. I am looking forward to that project with the hopes of even more savings once all is well.

Our Dec 21-Jan 21 billing was only $25 more than the previous month. This takes into account some extra usage from the Christmas festivities. The temps were a tad cooler during this period. Some...

More info is available at city-data.com
generic, but nonetheless

About half way down is the weather.

You need calc's.

I have a newer 3 ton Heat Pump. It seems that the nominal airflow for this tonnage is 1200 cfm for all manufacturers. My duct is 14" with 7 registers. Noisy and breezy. 1135...

Well. See. It was inspected. But. My only defense is that the city inspectors inspected the install and not the engineering. Our city inspectors are multi trade. They know a little about a lot....

Just wanted to say Thanks. As of this writing, I'm around 140 posts. All geared toward fixing our problem.

Came in with a dilemma from not having had Calc's done or knowing to even ask for them. ...

Duly noted.

Thanks

http://216.122.22.11/FetchDocument.aspx?ID=94012a85-f3c4-4bfc-ba3d-30488742bf19

Scroll down to page 6. Horizontal view. Shows the coil on the right of the blower, Fine print makes reference to...

Uplflow vs downflow vs horizontal? I have the latter.

OK. Thanks

Cool. I'm not as think as I smart I am.

I'm under the impression that the coil is on the return side when using a Heat Pump. Reason(s) being that it's a draw through design and the heat strip...

raises the question that if the evap coil is on the discharge side, it would heat up from the gas heat? Would be the same as having it on the discharge side of the heat strips?

This thread is a quickie but I want to throw it out there.

We have a Heat Pump. This means that the evap coil is on the return side so as not to be affected by the aux heat strips.

So, If I...

[QUOTE=jeff520;1731444]
Now I see that there are problems. I have a 100,000 BTHu/hr furnace to heat 1100 sq ft of living space (in Arizona!). I had a single return duct of 160 sq in to handle all...

I'm confused. You speak of me?

Alright, we're getting closer.

From one of the calcs that I just happened to grab, the author spelled out the info about my existing HP. Rheem RPPB-036JAZ with air handler BHK-21 JHNE. Evap coil...

Thanks for reading. Thanks for the replies. I'm going to bed now.
I'm losing it.

Peace

I thought about that. Maybe do the vacuum-purge thing or whatever also. I didn't find out if the charge was originally Ok but due to the outdoor unit tripping due to high head pressure some was...

Something ... happening ... I'm ... understanding. It hurts a little, but I'm understanding.

The tech who pulled some R22 didn't charge me for the service call. Felt sorry for us. I mailed him...

At the request of a tech, I removed the registers to allow the air to dump. Also dropped the return filter grille for less restriction and only use the perm filter at the unit. Some r22 was pulled...

The high speed is 1200. The dip switches take it to 1000. A 14" Sa & RA with 6 - 6" and 1 - 4" registers. That's about 1135 fpm. We've been flying kites in my kid's room. Noisy? What? Can't...

All part of the learning curve. It's OK, I put a curse on him.

My situation stands that the ductwork and number of registers as installed with the heat pump is too small for 1200 cfm of air. The 3 ton as installed (may) be a bit on the large side for the size...

Waterloo. I only see latent numbers on cooling

Long story, geo. Working backwards here. Had a 3 ton HP and 14" ductwork installed. Serious mismatch between unit and duct. Many comfort and mechanical problems. The 3 ton may be a tad large for...

Greetings. 1120 sq ft home.

I paid for three Manual J's, did two on-line calc's myself, used two generalities, (rules of thumb), and this is the average . I surmise that the Manual S was also...

An old saying goes, "20%of the people do 80% of the work." I consider myself one of the 20%ers in my craft. My employment history reflects my ethic. Not bragging. Just want to know why I don't...

Broad question.

My case was adding central heat/air and ductwork to a 40 yr old house that had only a gravity wall furnace, with a manual valve at that.

Had I known about the Manual's, I...

My first thought is to hire an attorney. Let them fight it out.
I'm too busy keeping food on the table to deal with the disgust. Besides, I cannot be held responsible for my actions should I snap...

When I find out why there isn't enough time to do it right but always enough time to do it again, I'll relax.

Why do I , John Q. Public, have to educate myself to be as smart or smarter than the...

oops. I tried to copy and paste a chart from a consumer reports repair history. I typed in, consumer reports furnaces, and hit search.

But me no howz. Anyway, it had American Standard as least,...

Amen to that brother. This I (now) know

What are the brands that you do prefer?

Another scam by the Man.

After the initial $20k install price, I suppose it would pay for itself eventually.

One was S-19664, L-965
Second was S-21372, L-868

Build more Nukes.

As a commercial electrician, I see more and more sub panels being put into the original sized electric closets. The technology boom over the last 20 years has in itself...

It was total load. L+S.
Also had an HSR of 0.70 factored.