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Well generally a 40k unit is the smallest you could get so even if your unit was modulating, it sounds like you would never get any modulation out of it with a 10 minute max cycle. Your house must be...

Double check your thermocouple placement. You likely don't have good flame contact. If you replaced the thermocouple and valve, that is pretty much the only things that would contribute.

Return it to the supply house and tell them there was a problem with it. Tell them you want you money back instead of a replacement. Shouldn't be a problem, most of their line isn't available right...

It sounds like you are more than 2* away from set point and so you are running the heat pump with AUX heat. Once you move to within 2* of set point, the AUX kicks off and leavs just the heat pump to...

That's called the "run 2 cycle" - Although I believe that the CPH should be set to six, according to the installation manual. Whatever works...

Yeah I read that too.

Yes.

Indoor airflow directly affects head pressure. The static pressure in the duct system should be measured to ensure proper airflow. That being said, your system already saw a heating season with no...

Or maybe the TXV is drifting - he should monitor operation for about 45 minutes, determine airflow and get superheat values over the course of that run time. If he does all that, he will find your...

Your high pressure switch is opening. Has the filter been changed recently?

The tech needs to check airflow and run the unit for 30+ minutes to observe pressure. Simply running it for 10-15...

^ smacked ass ^ you're right though. I'd much rather have my units made at some plant in mexico.

For me, this is snake oil. If it worked, OEMs would be incorporating it. Especially considering that the level of engineering on this particular product could be achieved by a miiddle school student....

X2 - people who have lots of problems with these furnaces don't know how to install them. Don't make your problem the manufacturers.

Yeah, that is the one. The parts are always 10 years but the labor is the big bonus - only $50 for 10 years is awesome. Basically $50 to never have to pay for a service call for 10 years. Just make...

That unit can not go right to high fire. Not a viable option on this unit.

The unit maintains a specific temperature rise across the heat exchanger. This can be adjusted via the ATR jumper from...

Right now York has a warranty special - $50 for 10 year parts & labor.

He has a point...

It sounds like your duct is restricted. A technician can verify duct issues with static pressure readings and/or an anenometer. Should be fairly straight forward.

The Luxaire 90+% modulating furnace, 80,000 BTU calls for a .15" WC blocked drain switch. You could also use a .2" as this is not the combustion air proving switch but simply the blocked drain...

What is the M# of the furnace?

Why do you have this thread in two places?

If you have a jumper between y1 and y2 then you don't need to turn the stat down any further. You need to make sure that you don;t have a bad economizer control that is trying to run free cooling....

Pressures and line temperatures would tell us a lot more. Nothing can be determined, based on the small amount of information that has been provided. The next step would certainly NOT be to cut into...

I guess the first thing you need to know is whether you have both a first and second stage call (y1 & y2), secondly do you have an economizer? Are there any faults on the board that might indicate a...

You didn't indicate the compressor's symptoms. Is it doing nothing, tripping the breaker, humming, etc.. if it is doing nothing and the windings are not open then I would be checking my wires between...

I'll stand by my statement that zoning is applied for comfort and not savings. Depending on the situation, there could be some savings or some cost increase but it is difficult to predict and zoning...

These are good points to consider and if the job is zoned from the beginning then it can be a money saver both in terms of lower equipment & installation costs and in terms of applying a smaller unit...

Zoning will not change the amount of heat in the house that needs to be removed so the load is still the same and the amount of work required is the same. A zoning system is designed to meet...

I know of no residential zoning products that use ddc controls. Electromechanical 'actuators' (motors) simply drive open or shut. In some rare cases they use a 'floating' control which can facilitate...

I'm not a carrier guy but at this point most manufactures sell a 'communicating system' the only benefit to you would be more efficient and quieter operation (maybe). All parts of the communicating...

All awesome books. I read pumping away and how come? wish I could have seen this post earlier.

Basically you can go with electro mechanical (EWC, honeywell, ARP, etc..) or you can go with Arzel. Arzel is amazing for retro fit zoning where as the others will be time consuming and or expensive...

If it is 13 seer then I would use and orifice. Any savings you may see from the TXV will be lost when it fails (or someone misdiagnosis it) and you are paying for a new one to be installed. It has...

Most heat pumps run near their full capacity at 40*
I don't know much about Michigan's weather so maybe if your cooling load is very low and they sized your heat pump for cooling (which is typical...

I don't know much about window air conditioners and I'm not sure how many guys on here are going to have any insight. They are just that - appliances. I live in a very old house in the city so I have...

Parts and Labor? I don't think anyone is going to come replace any parts on your window AC in the field. Are you talking more about a Ptac unit?

I just bought one at Wal-mart and they were trying to shove a 3 year plan down my throat at the register. You must not be looking very hard...

Also, setting your LTCO to 40 is not going to eliminate defrost cycles. Your coil will still be below 32* and there will be more moisture in the air to accumulate on it.

In most cases, a heat pump should be able to deliver it's capacity down below 40 degrees.

Sounds like you're squared away, then.

I think that would depend on the pressure generated inside the house.

Because the electric heat package could run with the heat pump so you have: heat pump only above BP, heat pump & Aux heat below BP but above LTCO and you have electric only below the LTCO.

On...

Sucks to work with Rheem/Ruud, then.

If the humidistat only lights up or has a display when it is calling for humidity(if it is the one that I'm thinking of) then it is wired incorrectly. The older stats had no display and guys wired...

Just a couple of things to add: 1 - If you are on a call specifically for uneven cooling, then you should be taking your time to address the issue. My response was geared toward what I commonly ran...

I will probably get blasted for this but here goes: as a service tech running 8 - 12 calls a day, it can sometimes be difficult to accurately assess and address issues like this. Of course we should...

You say they are constant volume but then you say they have VFDs? Usually the point of a VFD is to provide something other than constant volume. There are minimum airflow ratings for heating...

The savings in zoning is in initial cost over the 2 systems. Zoning adds comfort not energy savings. 2 systems would also address comfort but not energy savings. The main difference will be in...

The system does not know the outdoor humidity level. It reads the outdoor temperature. It is inadvisable to introduce too much moisture into the air when it is below a certain temperature outside...

If you set back more than 3 degrees you will be running your aux/emg, coming out of set back. Even with the VP8000. Some stats will finish out the call with Aux/EMG while others will 'reverse stage'...