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The air handler has an ECM motor which can/will change speed. It could be the module or board is going bad or someone adjusted the dip switches wrong.

As has been said you don’t want to just...

90k furnace in Florida is probably not needed but that does not mean that the 3T heat pump will put out enough heat to keep the house up to temp. That would depend on the load of the house and the...

Equipment sizing, #1. Proper duct system sized for structure and equipment with multiple returns strategically located, #2. Tighten up the building envelope and improve insulation as needed. The...

So far with the songs on this page I'm glad my ears don't work so good anymore! Seriously I think the tone from my tinnitus that sounds like the tone from my ohm meter that I hear almost constant is...

The load only shows 1700ish square feet I thought. Maybe it’s not a big deal, maybe it has to do with how the house splits. The important part is they get the load right or the runs to the rooms and...

Just to be clear, are you saying that half of your house is 2200 Sq Ft or that this unit is to handle half of your 2200 Sq FT house or 1100 sq Ft? That would make a difference on size.

Looking...

It sounds to me like you have a problem with the system and it is locking out, when you cycle the power it resets. There are multiple reasons for lockouts so without having a tech check it out you...

Not talking about the heated floor, but does the Geo unit heat the house properly or do you have a problem where you have to cycle power to get it to run?

On the Geo units that I am familiar with the DS is on a thermal switch so the internal pump for it only comes on when the unit is producing excess heat. If you have a pump that is pulling cool/cold...

Bring it to the attention of the local inspector, they should know this stuff but if they don't it is time to learn.

I ran into one years ago on a facility that was over 5 years old. Could not...

Is not flowing N2 a problem during installation?

I have been installing HVAC equipment 46 years, only the last 15 have I started using N2 while brazing. In my experience not using N2 is not in...

Generally with those, on the ones I found anyway, there was water stains or standing in the furnace.

You say you have had problems, sounding like reoccurring ones. Were these like high or low pressure switches tripping locking out the system?

Do you know if the install crew flushed the ground...

A hard start kit only helps the compressor. You say it is the fan not starting so this will only cost you money with no help towards your problem.

Apparently either the unit is working fine when...

As I read this the system worked fine with the old thermostat, acts up when the neST is attached, and word again when the old stat is reconnected. Seems to come down to either the NesT is wired wrong...

The reality is the Dehum will probably not create enough static pressure in the duct to overcome the filter resistance. Most filters has a pressure drop over .2, the dehum will probably generate...

if the company located the leak in the coil they should have replaced the coil in warranty however if cash is tight you would have had to pay for everything except the coil to change it IE labor,...

What thermal mass are you talking about? You can have a outside wall with a huge thermal mass and it will act as a buffer absorbing heat during the day and releasing it at night so the interior...

Humidity is water vapor, that’s all, nothing more.

Relative humidity is a measurement for water vapor in the air, similar to Fahrenheit or Celsius is to temperature.

RH is a percentage of how...

Can you or should you? Sure you can but then your A/C may not dehumidify as well or freeze up or the furnace may overheat or blow cooler than wanted air.

Then there is the technical aspect where...

Assuming the grains of moisture stay the same as temperature increases the RH decreases, and as temperatures decrease the RH will increase. Thus is because RH is a gauge of how much moisture is in...

I would change it now.

In all my years in this field I can think of few exceptions where new products bought in the first year of production didn't have issues, minor or major. It seems better...

Did you just answer your question? If not think about it!

I learned about them from a Venmar ERV instructions. It is basically an elbow that fits in the plenum and as the air passes over it it creates a venturi affect creating suction on the elbow instead...

Depending on the size of the duct and plenum they can put in a plenum elbow that will do away with the need for the backdraft damper.

On a properly installed and maintained system I would say the chances are slim. The equipment needs a ground wire going back to the electrical panel and the panel needs to be properly grounded as...

If I remember correctly the model he quoted is a downflow 90% modulating furnace. T is for Trane, D- downflow, H-90+, M-modulating. A D in the 3rd place was for 80% as I recall.

Maybe I'm wrong but I thought the modulating furnaces were communicating or 24V set through the interface so why would they need the relay panel.

I never put in a XC 80 but I did put in a few XC...

^^^^^^ THIS!!!

If you want to do this I would say you would need a 10 x 10 x 10 room with at least a 3200 CFM exhaust fan constant and intake louvers at the bottom of all 4 walls. The fan will...

With a 2 ton A/C why do you need 80k of heat?

As to the 1000 btu cooling different combinations of A/C, furnace and coil can make a difference in system output. The other part of this is what are...

Maybe that's why my distributor doesn't carry them!

My biggest question with a mini is it it can move enough air to mix it across the room. They do make ducted minis that will but those will take up more space. A 2 head mini in opposite corners may...

Here are 2 examples of what I am talking about. Seems like these examples and dip switches are at odds with each other.

Not only that but isn't it backwards from the universal standard of O being off and I being on or have I got that backwards?

Looks to me like the cooling part is right the heating is backwards

At the bottom of the page you posted is a note that explains it.

In my experience generally HUM terminals are dry contacts.

Did you check for power at those contacts to common?

Think of it from an NO/NC contact point of view.

Jim, since space in the attic is limited is there any way you could put a main trunk under the joist near a common wall and soffit around it then run just the runs in the attic to where they need to...

I have to apologize, I didn’t mean to take over your thread. Not very good manors on my part.

This isn’t house and shop it’s the office and business shop all one building.

The office has a 2 stg heat pump with 2 stg 90+ gas furnace. The shop area has 2 radiant tube heaters and a 2.5 ton...

I am always upfront about the charges especially on out of town jobs "charges are the time I leave till the time I get back". When they ask why I tell them it is because if I am on my way to your...

Therms = 500. The killer on the $/TH is the delivery fee. It is over $40/month on 3 therms for 7 months.

Electric rate is $0.11 for the first 500kW, then for 8 months out of the year it drops to...

Went back and figured it for my last fiscal year and it came out to $2.58/ therm. I need to check electric rates/therm to see how they compare as we are supposed to get a break 8 months out of the...

Sounds to me like they just wired them all together so when W1 comes on they all do. It should work you will just be using more back up heat at times than needed.

That would be what I am talking about but on the bill it is listed as a delivery fee. When I asked about this I said I would turn all the gas off in the building then so no gas would be delivered. ...

Dan, what are you using for the price per therm for the gas heat, the cost of the gas or the cost of the gas and delivery fee.

The reason I ask is my gas provider has started putting a delivery...

If you can per local code I would seriously look into vertical loops rather than horizontal. From what you have posted on the load you could get by well with a 4 ton 2 stg with a little back up...

When I see it it's on an upflow but theory is the same. I remember the first time I saw it a register was cut in just above the the top of an old standing pilot basement style furnace 60's model or...

That may be it but I don't think so.

I have run into this before, it has to do with laminar flow. The air in the middle is hotter than the air around the outside. When the air hits the end of...