Start/Stop vs Continuous

We retire our trailers at the 7 year mark due to failing insulation.

And running a Carrier 7500x is powerful enough to drop the temp 1 degree per minute, so yes, 5 minutes an hour average. If its just barely below freezing, it might only run 2 minutes an hour (I am not talking starting and shutting down in 5 or 2 minutes, only the average total run time. It may not start for hours until the temp hits the threshold, then start, run until below the threshold and shut down (ours are set at 6 above and below for start/stop).

 

I concur. 7 year old trailer, if it has been used, it won’t hold temp like a brand new one. Also newer trailers are better built with composite materials. 7500x is a beast. I can run start stop 80 degree difference with unit barely running. If you need continuous to keep cool, you got outdated equipment.- Unless product loaded is out of temp at load.

 

@Short Fuse EOD
Unless your hauling fresh produce.....most need constant air flow...and the hard start and cold blast from start/stop tends to burn or very least drastically dry too layers.....
Anything with top ice tends to freeze the tip ice hard because it melts too quickly without cooler air flow and again the hard blast from start/stop causes a problem

 

This is sooooo true

 

certain places yes, but high speed kill switch and defrost button works for them though

it is supposed to be off when doors are open though

 

Are you willing be responsible for a fully loaded trailer that was rejected for temperature because you turned the reefer off when you weren't told to do so? I am not, I have my own authority and do everything I can to avoid a claim. I do have a low speed switch installed and I flip it to low speed when my doors are open.
Here is an example: a guy at Target in Lake City opened his doors and backed into the dock. At Target they open the doors from the inside. Well they rejected his entire load because he opened his doors. A bit excessive but it happened.

 

Not surprised with that particular Target. I hate going there.

 

Ignoring the claim possibilities, (which is why I use defrost/low speed) both tk and carrier say unit off when doors are open.

I have my bulkhead chained to the side of the trailer that I leave up when I back in and make them pull it, as much as I hate having them mess around with a $1000 piece of equipment, i figure I save it in fuel, and possible claims keeping it cold,

once they pull it down I give it 5-10 minutes and have it run a defrost and cut the high speed, most of time with LTL stuff though I’m at the smaller places unloading into a small dock or even a parking lot so I do kill the unit for that

 

Which ever way you choose to do it that is obviously up to you. I have a bulkhead as well that I have strapped to the wall when not in use. I always take my bulkhead and load bars down so they don't disappear, unless its a dock that opens the doors from the inside. Just remember some recievers like to play games and reject product, especially when they over order and there is absolutely nothing wrong with it. You don't want to give them a reason to reject something for temperature. If you shut off your reefer and there is rejection for temperature, most likely you will be asked to have a download done on your unit. And when it shows that you shut your reefer off, you won't have a leg to stand on. I am explaining this to you not to have an argument, but to save you from an expensive mistake.

 

I used to block the drain holes unless it was a wet load like iced, stopping the warm/cold air from entering through the drains helps a lot. I just used paper towels, but now I guess they have rubber plugs.