We've never had that problem. What is your discharge temp and what is your charge temp? How long do you leave the drum door open? How exactly do you have the machine setup after discharge and to charge?

Hey Chuck!

When your roaster has oscilated in temp at your temp control setting at least 5x before charge, you are all set for another roast. This means even swings to high and low temperatures at your temp control setting. This should only take between 2:30 to 4:00 to achieve. In our roastery we are getting those even oscilations in temperature around 2:00 and have consistent results batch to batch, and thats at 3x oscilations.

Give 5x a try and see if that cuts down your time between batches.

Thanks, Steve. I should have included more context... MCR-2D. I leave the drum door open until the drum temp is about 10 degrees below charge temp for the next roast. I also wait until I have completed 5 preheat cycles. Typical setup is 2.1Kpa fuel, 23Hz fan, 44Hz drum speed.

Discharge into the cooling tray and close the door.

Your roaster saves all of your original charge settings and resets fan, fuel, drum speed to whatever they were when you charged. It also saves your charge temp and sets your preheat to the original charge temp when you close the drum door. This automates a "between batch protocol" which you are inconveniently circumventing by leaving the door open.

Once it's up to temp, charge. That should only take a minute or two.

Thanks, Steve. To be clear, I wasn't circumventing the intended between batch protocol, when the door was closed, all settings were still set. The reason I waited to close the door was to allow DT to drop enough below the set point that, when the call for ignition was made, there was enough temp delta to allow the valve to fully open to the set gas pressure. I'll try closing the door after dump. Sounds like you're not recommending waiting for the 5 cycle preheat to complete, is that accurate?

If you are using Roast Replay, you would wait for the machine to cycle enough to prompt the charge. If you're manually production roasting, you should be able to charge as soon as the machine comes up to temp because any small variation in preheat can be over come with minor manual fuel adjustments.