When the sensor detects the heat, it signals the solenoid on the control valve to open and release the gas, which is then lit by the glowing hot igniter. When the dryer is started, the igniter heats up. Some dryer models have a single rear ball bearing attached to the back of the dryer drum that is cradled in a nylon receiver.Ī gas dryer uses a burner assembly, which is comprised of a control valve with two solenoids (also called coils), gas valve, igniter, and a flame sensor. It is also common for the drum to be supported by a number of support rollers. Several nylon or felt strips located at the front and or rear of the dryer drum reduce friction from the drum's rotation. The belt is given tension by a spring pulley that increases the belt's grip on the drum in the form of friction. The dryer motor turns the clothes drum with a belt as well as a fan called the blower. The dryer door switch senses if the dryer door is open or closed and will not allow any mechanical or electrical function if the door appears to be open. This is the most common cause for a dryer that runs normally but has no heat. The thermal fuse is a one-time blow fuse that will burn out if the dryer temperature rises above safe operating levels usually 250º. Wet clothing will cause the temperature to drop rapidly requiring the dryer's heat source to cycle at a faster rate than a drum filled with less moist clothing. The other method uses the thermostat to advance the timer depending on how quickly the drum temperature is fluctuating. Within the dryer drum contacts both strips, the counter is reset to zero. Less dry settings might be 10 while more dry settings might be 40. Two metal strips located within the drum will reset an internal counter that attempts to count to a particular number. Moisture sensing is accomplished one of two ways. The hi-limit thermostat acts as a safety that will break power to the heat source if the ducting becomes blocked or the dryer overheats. The cycling thermostat cycles the heat source of the dryer on and off to maintain the drum temperature at a controlled average depending on the dryers temperature setting hi, med, lo, etc. The dryer's timer regulates the time length of the dryer cycle.
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