Gas Clothes Dryer and Electronic Dryer, household Appliance Clothes Dryer how it Works continue…

Main Burner Gas Valve Assembly

This valve assembly is probably the most important component of the gas burner assembly. The valve assembly controls the flow of gas to the main burner from the gas supply line.

Cycling Thermostats

Cycling thermostats are bi-metal devices or thermo-discs that are designed to cut the main burner OFF when a pre-determined temperature has been attained in the dryer drum. There is no adjustment of the temperature response of these thermostats.

Adjustable Thermostat

Some gas dryers use an adjustable thermostatthat does not use a bi-metal disc to open the circuit to the burner when a certain temperature has been attained. Instead, the adjustable thermostat uses a feeler bulb containing a mercury charge to sense the temperature of the discharge air.

High-Limit Thermostat

This thermostat interrupts electrical power to the gas burner valve if the temperature of the burner housing exceeds a critical temperature. In some models, the high-limit thermostat also shuts OFF electrical power to the dryer drive motor. You must restart the dryer after the drive motor cools to normal temperature. This thermostat is a safety feature that prevents dryers from overheating.

ELECTRIC DRYERS

The electric dryer differs from gas models mainly in design of the heating element. The electric dryer requires a three - wire 220-to 240-volt power source to operate. The two incoming lines to the dryer terminal block each represent 110-125 volts of power. Electricians refer to these as line one, Ll, and line two, L2. Ll connected to the neutral wire is the power source required to run the drive motor. It requires only 110-125 volts. However, the electric dryer requires 220-240 volts of power across the line to drive the heating element.

Dryer Cord

Electric dryers use a heavy-duty, three-wire cord that is usually designed to operate in unison with a minimum 30-amp circuit breaker. A ground wire usually is not required in the installation of an electric dryer.

Drive Motor

Electric dryer motors are usually rated from 1/4 to 1/3 horsepower, and require only household current (110-125 volts). The dryer motor is a double-shaft type. One end contains a pulley that attaches to a drive belt to rotate the drum. The other end of the motor attaches to the blower wheel.

Cycling Thermostats

The electric dryer normally uses the two types of thermostats that have been previously described in the “Gas Dryer” section.

High-Limit Thermostat

The electric dryer normally uses the same type of high-limit thermostat previously described in the “Gas Dryer” section.

Heating Element

A coiled wire heating element is the heat source used to dry clothes in the electric dryer. This element is designed to operate on 220-240 volts of power.

Door Switch

Most electric dryers use a door switch designed to shut OFF both the heat and the dryer drive motor when the door is opened. When the door is closed, the dryer will resume normal operation. Most late model dryers require a “push-to-start” switch to be activated before normal operation resumes.

Dryer Vent Kit

The dryer vent kit is an auxiliary component designed to exhaust moisture-laden air to the outside. Without this device, the dryer would overheat the laundry room and would spread lint throughout the utility room or garage.

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