The 16+ SEER Trane units with large condensers have large amount of refrigerant. This sometimes causes issues with off state liquid refrigerant flood back to compressor input. They use compressor's discharge check valve and they close down EEV when it shuts off to trap refrigerant between compressor check valve and EEV. As condenser cools down in inactive state much of refrig gas condenses under the trapped off state high pressure and stays as liquid in condenser, reducing possibility of liquid flood back to compressor. Problem is the compressor check valve starts to leak more as unit gets older allowing more liquid to condense on low side of compressor in off state. You can check how long high side pressure last after shutting off unit. It should stay with elevated pressure for over an hour to give time for condenser to cool to ambient temp and condense trapped refrigerant gas. Another common issue is thermistors in air handler. If it detects out of range reading of thermistor it reverts operation to a 'safe' mode which is effectively a fixed orifice mode of fixed EEV opening position. They don't close down EEV in off state when in this safe mode. In this mode you can hear the woosh of equalizing liquid refrigerant into air handler after unit shuts down that you do not hear in normal mode operation when EEV shuts fully closed (position 0 of 0-500 range on EEV). Air handler may show a flashing red light indicating out of range thermistor but homeowners rarely notices it. If run too long in safe mode, particularly at cooler outside temps, it can do permanent damage to compressor. I would much prefer they shut unit down forcing homeowner to call for service. A service tech could invoke safe mode temporarily to keep some cooling for homeowner until they return with replacement thermistor. If you often service Trane units you should keep spare thermistors on your truck.
They don't call them Trane's for nothing. My 5 ton variable speed American Standard is every bit of that big if not bigger. Thing weighed over 300 lbs. Mine did a soft lockout on me couple months ago because the condenser fins got clogged up with pet hair and the compressor kept overheating does it more than 4 times in a 24-Hour period it soft locks itself for service to keep the homeowner from burning it up.
We just had the same problem the AC guys came and they said it was a soft lockout which they weren’t that familiar with but they reset the unit and it started working again they have no idea why it locked out this was during heat pump operation
It was likely on soft lockout because it wasn’t running. When I removed 24V by cycling power to air handler it reset and began cooling. I found no other problems
Looks like your following Ca code compliance ( Locking caps)?...hopefully they don't impliment HERS rating and t24 compliance...If so, tack on $260- $350 per install
The 16+ SEER Trane units with large condensers have large amount of refrigerant. This sometimes causes issues with off state liquid refrigerant flood back to compressor input. They use compressor's discharge check valve and they close down EEV when it shuts off to trap refrigerant between compressor check valve and EEV. As condenser cools down in inactive state much of refrig gas condenses under the trapped off state high pressure and stays as liquid in condenser, reducing possibility of liquid flood back to compressor.
Problem is the compressor check valve starts to leak more as unit gets older allowing more liquid to condense on low side of compressor in off state. You can check how long high side pressure last after shutting off unit. It should stay with elevated pressure for over an hour to give time for condenser to cool to ambient temp and condense trapped refrigerant gas.
Another common issue is thermistors in air handler. If it detects out of range reading of thermistor it reverts operation to a 'safe' mode which is effectively a fixed orifice mode of fixed EEV opening position. They don't close down EEV in off state when in this safe mode. In this mode you can hear the woosh of equalizing liquid refrigerant into air handler after unit shuts down that you do not hear in normal mode operation when EEV shuts fully closed (position 0 of 0-500 range on EEV).
Air handler may show a flashing red light indicating out of range thermistor but homeowners rarely notices it. If run too long in safe mode, particularly at cooler outside temps, it can do permanent damage to compressor. I would much prefer they shut unit down forcing homeowner to call for service. A service tech could invoke safe mode temporarily to keep some cooling for homeowner until they return with replacement thermistor. If you often service Trane units you should keep spare thermistors on your truck.
Just learned something new on this job. Thanks!
They don't call them Trane's for nothing. My 5 ton variable speed American Standard is every bit of that big if not bigger. Thing weighed over 300 lbs. Mine did a soft lockout on me couple months ago because the condenser fins got clogged up with pet hair and the compressor kept overheating does it more than 4 times in a 24-Hour period it soft locks itself for service to keep the homeowner from burning it up.
We just had the same problem the AC guys came and they said it was a soft lockout which they weren’t that familiar with but they reset the unit and it started working again they have no idea why it locked out this was during heat pump operation
The unit doesn't look that old and it's already failing.
You should see the Trane XL units, there even bigger. By the way, love the video’s.
Nice one ! Stay safe !
A bad capacitor was causing the breaker to trip?
It can, and did in this case.
If it pulls LRA for too long it can trip it.
Thanks for the tip, I appreciate your videos!
Thx.
Good job.
What was the fix for the lock out code?
It was likely on soft lockout because it wasn’t running. When I removed 24V by cycling power to air handler it reset and began cooling. I found no other problems
@@HVACGUY thanks for the info love all your videos keep up the great work 👍🏻
I see the shraders have locks. Is that code in your area?
Yes
Looks like your following Ca code compliance ( Locking caps)?...hopefully they don't impliment HERS rating and t24 compliance...If so, tack on $260- $350 per install
Might be another over sized breaker?
I’d say if a bad cap trips a breaker it’s probably just right
A giant lol 😂 try working on a hundred ton rtu lol that’s a baby 😱
Oh I have done my share of commercial . I choose to focus my efforts on residential, and for residential that’s a big unit.
Ok