The radiant heat sensor is mounted on the side of the burner funnel assembly. A cut-out in the funnel allows radiant heat from the ignitor and the gas flame to reach the sensor as shown below.
The ignitor will normally reach a temperature of 2200°F in about 15 to 30 seconds after line voltage is applied. The radiant sensor opens the circuit to the ignitor when this temperature is reached. The gas valve is energized simultaneously, and when gas contacts the hot ignitor, ignition takes place.
Obtain an ohmmeter. We will be doing RESISTANCE checks. This is the safest way because the dryer is unplugged from the power source and avoids the possibility of you receiving an electrical shock.
Step 1 Remove one wire at a time, carefully label- ing each wire according to the terminal marking on the sensor. This procedure should assure that the right wire is reconnected to the right terminal after checking or replacement.
Step 2 Set the ohmmeter scale to the lowest ohms setting and ZERO the meter.
Step 3 Touch and hold one ohmmeter probe to one of the terminals on the sensor.
Step 4 Touch the other ohmmeter probe to the other terminal on the sensor.
Step 5 The ohmmeter should show ZERO resis- tance (continuity). If not, the sensor is bad and needs replacing.
Step 6 If this check showed ZERO resistance, then reconnect the wires to the proper terminals on the sensor.
Step 7 Remove the toe panel.
Step 8 Set the timer control and start the dryer.
Step 9 Watch the ignitor for a couple of minutes. If this stays red hot and the gas does not come out and ignite, the sensor is bad and needs replacing.
After passing through the valves, the gas comes to the orifices. The main purpose of the orifice is to control the gas output from the valve body at a set level into the burner and shutter assembly.
The orifice is a precision part and should never be redrilled in the field. Drilling could leave a burr which changes the flow pattern of the gas creating turbulence inside the venturi and reduce the amount of primary air drawn in through the shutter.
Burner B.T.U ratings can be changed by varying the orifice size. Orifices have a number stamped on them. The larger the number, the smaller the hole. On dryers, the orifice should be changed if it is supplied with anything other then natural gas.
I replaced the thermal fuse in my dryer. The dryer is getting warm but not hot enough to dry the cloths. It’s taking forever to dry a load of cloths.
You need to check your dryer vent. Make sure the dryer vent is free of lint build up and has no kinks in it.
I would also check around the blower housing and fan for lint build up. With out the proper air flow your dryer can over heat and blow the thermo fuse you replaced. Poor air flow will also increase the time it take to dry a load of cloths.
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• Fundamentals of Service: Selection, Purchase, and Installation of Appliances and Air Conditioners • Safety Precautions • Tools for Installation and Repair • Basic Techniques • Fundamentals of Electric, Electronic, and Gas Appliances, and Room Air Conditioners: Electricity • Electronics • Gas • Principles of Air Conditioning and Refrigeration • Electric, Electronic, and Gas Appliance Parts • Appliance Service, Installation, and Preventive Maintenance Procedures: Dishwashers • Garbage Disposers • Electric and Gas Water Heaters • Washers • Electric and Gas Dryers • Electric and Gas Ranges/Ovens • Microwave Ovens • Refrigerators and Freezers • Ice Makers • Room Air Conditioners
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