Change the board, I went to a nordyne IQ drive class a few years back and the solution to every problem you come accross is to replace the board... Lol.
What I like about this unit is no special thermostat wiring is needed. You can use everyday 18 GA thermostat wire and it takes 4 wires to control the outdoor unit. Well that is not true. You could actually get away with two wires by adding a 24 volt transformer to the outdoor unit to power up the R & C terminals and use the two wires for communication.
No special TXV valve. Used the same indoor furnace we always use. This installation is a no brainier.
I just gave them feedback for 6 corrections to it. Adding the 2" ABS couplings to the factory feet was an idea I had back in the day and they ran with that idea. I do have a lot of input in this manual now that I think about it.
14 EER. Keep in mind, ARI ratings are only at 100% capacity as ARI does not rate systems at the lower capacities this unit can operate at. With operation capacity starting at 35% the coils are then over-sized. This has to be a higher efficiency than ARI states depending on it's use (IMHO).
If the unit is sized correctly the should be on high speed at ARI rated EER conditions. Looks like the Lennox takes a bit of a hit at the higher tonnage ratings 13 EER is what the spec sheet you posted is showing for most air handlers/furnace combos. I've alway been one to believe more in EER than SEER because in most areas of the country I think a AC unit spends more time operating with a 15 degree or more temperature difference between indoor an outdoor temps than 2 degrees or less. Nobody buys a 5 figure HVAC system and keeps their house at 80f in the summer.
Just for kicks I pulled the data on my own 2ton AC that I purchased last summer. At the 4 ton size the Rheem value series is only 1 EER less than the top of the line Lennox. Hard to believe that a Rheem 14.5 SEER value series is so close in EER to the Lennox top of the line system, does ARI verify these ratings or do they just take the manufacturers word? I'm having a hard time believing that a 14.5 SEER value line Rheem unit is only 1 EER less than a top of the line 22.5 SEER Lennox communicating system. At the 2 ton size the Lennox does produce a impressive 15.5 EER.
Sounds data is also interesting, the top of the line Lennox is only 3db quieter than the Rheem value series when the Lennox is on high speed. Considering the cost of the Lennox I would have expected better. Again, is somebody verifying these ratings or do they just take the manufacturers word? No sound blanket for the compressor or special shaped fan and an ordinary PSC motor, yet only 3db louder?
The Smart-hinge sounds like a great idea, does it allow you to clean in between the split coils?
EER is an honest number at a given 100% load condition, but all areas go through changes in cooling loads, even Phoenix, AZ. So there is much to gain when it comes to equipment operation at a lower capacity with oversized coils. There is no testing from ARI on what energy savings this unit can achieve because it does vary based on a variety of conditions but what this unit does do is match the equipment capacity to the actual load at a given time and only inverter equipped equipment can do that.
The ARI numbers in this Lennox document are also listed on ARI's web site. Lennox is conservative when it comes to publishing ARI and sound numbers. I also believe this unit to be quieter than the sound number they published as I am comparing it to other equipment and models I have experienced. What can I say, this is quiet unit especially at night when the cooling loads are much lower. The thermostat also has a/c humidity control and that is a nice bonus too.
[QUOTE=But your lifting device looks cool. Do you manufacture these? Good idea![/QUOTE]
Yes I do. This is a new product I just introduced a couple of months back. Works on Basiloid equipment packaging from Lennox, Nordyne, Rheem and their related brands. I am getting very good feedback on this product. Makes some jobs a "one man show" when it comes to moving around product with a hand truck.
What static pressures are you running on high speed/1600cfm?
The high coil area giving high EER shows up on the 2 ton model hitting an incredible 15.5EER, the highest I've seen on any air source AC system. 27sqft of double row coil is nuts for a 2 ton system, I thought my system with 16sqft single row coil was a lot on my 2 ton!! Pity that anybody dropping 5 figures on a HVAC system won't opt for the 2 ton, regardless of what the actual cooling load is.. Have you ever seen a 2 stage or variable speed system under 3 tons actually installed in a home? A 3.5EER hit going from the 2 ton model to the 5 ton, speaks a lot for not oversizing this model to get the full rated SEER/EER out of the unit...
Part of me wonders if a 4 units are identical and the compressor speed is simply limited by the board on lower tonnage models. Are the part numbers for the compressors different for each model?