I just had a 5-ton TRANE XR-17 2-stage compressor, with a TEM 6 variable speed air handler installed with many extras for 16k. The TRANE XV 20i Install in this video is impressive; and in my neck of the woods would have cost somewhere north of 22K.
Wondering how old that system is and that "thermocouple bulb" part. Doesn't seem that it lasted long and its rare they fail is my guess. The high end systems seem to be so quiet and work less hard in general but man the price is big as my guess is that the parts are proprietary and expensive and not so redily available?
Those screws in the doors are better than the quarter turn fasteners on the first series tams. If not careful they would break, especially if someone didn’t know what they were.
Thermistors are the weak link. Insulation over temp sensors is important to avoid air flow over them from affecting temp reading and keeping them tightly wrapped minimizes humidity intrusion that will eventually make it through sensor wire end epoxy seals screwing up sensor. Black wire gas sensor is equivalent to TXV bulb sensor and orange wire coil sensor reads the evaporator refrigerant saturation temp, equivalent to refrigerant PT temperature on low side suction pressure at the evaporator. Difference in two temps is superheat leaving evaporator coil used to control EEV. The Trane high efficiency units with large condenser coils have large refrigerant loads. They completely shut down the EEV in off mode, along with compressor discharge port check valve, to trap refrigerant on liquid side of system to reduce possibility of liquid refrigerant flood back to compressor during off mode. Once condenser cools down in off mode, most of the refrigerant load remains as liquid in condenser. When temp sensor goes bad, out of range, system reverts to safe mode, operating like a fixed orifice valve. If it is cool outside, it is important that it is not allowed to operate this way for long period of time. On some early firmware revisions in safe mode, you may lose the refrigerant trapping feature in off mode and can have some compressor liquid refrigerant flood back in off mode.
Seems like a strange place to put a circuit board, under the coil drain pan. I put a overflow pan under one of these unit last year. A very different style unit that's for sure. Trane always had a odd/weird design to there units.
Did you notice a lot of air coming out around the door or are the doors sealing well on the unit. The reason I ask is we have a similar unit that blows are out around the doors and our service tech says that is normal.
Im having my old system changed out with the TAM9 and XV18 vs going back with a 2.5. Being that they are variable speed units, I wanted the extra cooling compacity in case I need it.
ahh, the Trane fully derailed over an $0.01 thermistor.... because that's what's inside the "magical sensor" and about what they cost in bulk before being assembled into the final part. 🙄 it's all stupid really and wait until they start having water intrusion, corrosion in wiring and terminals(cross connecting) and more terminal issues from vibration. there will be needless parts changing by the stacks and endless call-backs because of mystery problems going away for a while once anything is touched with a ten foot pole. oh, I just summed up all the other highly electronic things (vehicles, computers, appliances, etc.)
