According to the provided references, the average time it takes for a furnace to raise the indoor temperature is approximately one hour to increase the temperature by 1 degree. After that, it takes about 45 minutes per degree.
It is also mentioned that the temperature rise and constant temperature of the furnace are indicated by the traffic light of the temperature indicator. The green light indicates the temperature rise, and the red light indicates the constant temperature.
Additionally, the references provide some general information about gas furnaces and their ability to attain high temperatures. The maximum temperature reached in an ordinary gas furnace using illuminating gas made from coal and air at 2 or 3 lb. pressure is about 1400°C. When burning natural gas, temperatures 100° or 200° higher may be attained. By recuperating the waste heat or preheating the gases, these temperatures could be raised considerably. The addition of oxygen can also result in temperatures over 2000°C.
Regarding maintenance and troubleshooting, the references suggest the following:
1. Before using the electric furnace for the first time or after long-term use, it should be dried. This can be done by keeping it at 200°C for 4 hours and 600°C for 2 hours.
2. Lubricate the two bearings and the drive chain after long-term use.
3. After the furnace tube is used at a high temperature and work is stopped, the power of the electric furnace must be turned off and the temperature of the furnace lowered to below 400°C before cutting off the power of the motor.
It's important to note that the provided references may not cover all possible scenarios, so it's always advisable to consult the specific manual or manufacturer guidelines for accurate and detailed information regarding a particular furnace model.
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