To be able to adjust it to the desired temperature curve during the roasting, the burner, the exhaust damper, the insulation, and the heat retention part were enhanced, reducing the roasting loss by changes in the temperature in the furnace to the utmost limit.
While using the machinery, the machine becomes really hot. Please be careful to avoid burns.
Be careful with the gas vanish, empty roasting, gas leakage of the gas burner.
Also recommend a regular inspection of the local gas company and ask to check the gas leak as a gas appliance. Pay attention on the ventilation.
Please do not modify the machine without the consent of the manufacturer.
Modification without consent of the manufacturers may affect significantly the performance of the roaster and the safety of its use. Will also void the warranty.
The roasting method is as follows.
Put the exhaust damper to the [close] position, and press the button to light up the burner. Wait until the gas pressure is lowered down to 1/2, keep the exhaust damper slightly closed and after preheat for about 15 minutes. Operate it in such a way that the temperature in the thermometer should not exceed 200 , make sure you are accumulating enough heat.
Around 200 , put the green beans.
If you open the exhaust damper, the quantity of the external air dragged in to the cylinder will increase, turning down the temperature of the hot air. In other hand, if you close the exhaust damper, the air dragged in to the cylinder is reduced, increasing the pressure in the oven and so the temperature. You can check the pressure in the oven from the hole for the test spoon. During the roasting, the damper should be positioned in such a way that the hot air does not escape from the hole for the test spoon, and allocated as neutral position. As the roasting continue, the amount of smoke increases and the middle point is shifted little by little to the [close] position.
Usually, we roast firmly until the first crack, and in the end of the first crack, we decrease the gas.
From here, it tends to progress fast, so decrease the gas pressure and move the exhaust damper towards [open] position.
In a short time roasting the neutral point (lowest point of thermometer after the launch of the green beans) should be more than 100 as possible.
For this, you need to have enough heat beforehand. For long time roasting, after the process of dehumidification, the beans are going to color slowly with the preheated oven during the parch.