Copyright © Canadian Standards Association Gas Technician 2 Training Module 14 Domestic Appliances Copyright © Canadian Standards Association Unit 1 Ranges Purpose Cooking with gas has never been more popular. Numerous gas ranges, types of ignition systems and temperature controls are used. The gas technician must be aware of old as well as new technology that may be encountered when installing and servicing gas ranges. Copyright © Canadian Standards Association Unit 1 Ranges Learning objectives 1. Describe the different types of gas ranges. 2. Describe the installation procedures for gas ranges, including piping and electrical connections. 3. Describe the burners and ignition systems. 4. Describe oven controls and their calibration and testing. 5. Describe the operation of gas ranges. 6. Describe the servicing of gas ranges. Copyright © Canadian Standards Association Types of gas ranges Types of ranges: Free-standing Built-in Gas and electric combination Dual fuel Features Heat transfer methods Module 14 Unit 1 Topic 1 Copyright © Canadian Standards Association Installation requirements Manufacturer's specifications Code requirements General considerations Fuel conversion Module 14 Unit 1 Topic 2 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-1 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-2 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-3 Copyright © Canadian Standards Association Piping Connection Regulators Burner orifices Leak testing Removing old appliances Testing pressures Connecting components Module 14 Unit 1 Topic 3 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-4 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-5 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-6 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-7 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-8 Copyright © Canadian Standards Association Electrical Electrical Code requirements Module 14 Unit 1 Topic 4 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-9 Copyright © Canadian Standards Association Burners and ignition systems Top burners Top burner ignitors Standing pilot Electric ignitor Module 14 Unit 1 Topic 5 Copyright © Canadian Standards Association Burners and ignition systems...Continued Oven burners Oven ignition systems Match-lit ignition Constant pilot Spark ignition Hot surface ignitor Mini-pilot (thermocouple) Extinction pop Module 14 Unit 1 Topic 5 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-10 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-11 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-12 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-13 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-14 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-15 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-16 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-17 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-18 Copyright © Canadian Standards Association Oven controls Cycling oven controls Oven thermostat Safety valve Electronic safety valve Set-back controls Self-cleaning oven Programmable clocks Module 14 Unit 1 Topic 6 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-19 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-20 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-21 Copyright © Canadian Standards Association Oven control calibration and testing Mechanical adjustments Oven thermostat calibration Temperature setting knob adjustment Standby pilot flame adjustment Bypass flame adjustment Module 14 Unit 1 Topic 7 Copyright © Canadian Standards Association Oven control calibration and testing… Continued Electromechanical adjustments Flame switch system Hot surface ignitor system Solenoid valve test Electronic adjustments Principle of thermistor operation temperature control Module 14 Unit 1 Topic 7 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-22 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-23 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-24 Copyright © Canadian Standards Association Module 14 Unit 1 Figure 1-25 Copyright © Canadian Standards Association Operation Gas pressure Primary air supply Primary air adjustments Module 14 Unit 1 Topic 8 Copyright © Canadian Standards Association Service Proper servicing practice Diagnose customer complaints Follow manufacturer's specifications Interpret wiring diagrams and schematics Practice safety Remove faulty components Install replacement components Verify operation of replacement components Ignition system faults Top burner faults Oven burner faults Module 14 Unit 1 Topic 9 Copyright © Canadian Standards Association Answer Key Assignment 1 1. Where is the input rating of a range located and what purpose does it serve? On the rating plate. It allows the installer to determine correct piping or tubing size, and set burner inputs correctly Copyright © Canadian Standards Association Answer Key Assignment 1 2. How must the range be connected to the electrical circuit? By means of an approved power-supply cord with a threeprong grounding plug Copyright © Canadian Standards Association Answer Key Assignment 1 3. What are three ways to determine the required clearance to combustibles for a range before installing it? Consult the rating plate, manufacturer’s instructions and Code Copyright © Canadian Standards Association Answer Key Assignment 1 4. What is the allowable clearance to combustibles for a range certified for zero clearance? 30 inches above, 1 inch at the back Copyright © Canadian Standards Association Answer Key Assignment 1 5. What is the purpose of the appliance regulator? To reduce gas supply pressure to operating pressure of the appliance Copyright © Canadian Standards Association Answer Key Assignment 1 6. Why must there be gas flowing to properly read and adjust pressures? Because pressure lost due to gas flowing through the system must be included for an accurate pressure reading and it will not be included if the gas is not flowing Copyright © Canadian Standards Association Answer Key Assignment 1 7. Describe what is happening when a flash tube ignites a burner from a pilot. Gas flows into the flash tube, drawing combustion air with it. Gas and air mix as they travel down the tube to the pilot flame, where they are ignited. Flame flashes back to the burner and ignites the gas at the burner ports. Copyright © Canadian Standards Association Answer Key Assignment 1 8. Why is it important to verify the calibration of an oven control? To ensure safe and efficient operation and satisfactory Copyright © Canadian Standards Association Answer Key Assignment 1 9. How long should a gas range operate before adjusting the oven temperature calibration? 15-20 minutes Copyright © Canadian Standards Association Answer Key Assignment 1 10. What could be the causes of intermittent pilot outage on a range equipped with a mini-pilot system? Pilot size inadequate, weak magnet, overfired or smothered main burner flame causing smothering of pilot Copyright © Canadian Standards Association Unit 2 Clothes Dryers Purpose The operation of a gas clothes dryer is somewhat different than that of other common gas appliances. The gas technician must have a full understanding of installation procedures, service and maintenance to ensure the equipment operates safely and efficiently. Copyright © Canadian Standards Association Unit 2 Clothes Dryers Learning objectives 1. Describe the installation requirements for clothes dryers. 2. Describe the installation procedures for gas ranges, including piping and electrical connections. 3. Describe the moisture exhaust venting. 4. Describe burner ignition systems. 5. Describe clothes dryer controls. 6. Describe the operation of clothes dryers. 7. Describe the servicing of clothes dryers. Copyright © Canadian Standards Association Installation requirements Responsibilities of the installer Clearances Gas supply piping Moisture exhaust vent Levelling the dryer Electrical supply Module 14 Unit 2 Topic 1 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-1 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-2 Copyright © Canadian Standards Association Piping Fuel conversion Inlet pressure Making the gas connection Pressure regulators Module 14 Unit 2 Topic 2 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-3 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-4 Copyright © Canadian Standards Association Electrical Power supply Polarity and grounding Installing the dryer Module 14 Unit 2 Topic 3 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-5 Copyright © Canadian Standards Association Moisture exhaust vents Types of vents Exhaust hoods Vent length Vents in unheated areas Routing the vent Tools required Module 14 Unit 2 Topic 4 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-6 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-7 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-8 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-9 Copyright © Canadian Standards Association Burner ignition systems Constant pilot Glow coil system Spark ignition burner Glo-Sil burner Module 14 Unit 2 Topic 5 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-10 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-11 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-12 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-13 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-14 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-15 Copyright © Canadian Standards Association Controls Drum motor and door switch The drying cycle Temperature controls Timers Automatic cycle Cool-down period Start switch Thermostats Module 14 Unit 2 Topic 6 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-16 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-17 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-18 Copyright © Canadian Standards Association Operation Heating the air Primary and secondary air Properly adjusted primary air Air movement Exposing clothing to heated air Drum rotation Baffles Module 14 Unit 2 Topic 7 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-19 Copyright © Canadian Standards Association Module 14 Unit 2 Figure 2-20 Copyright © Canadian Standards Association Service Electrical sequence of operation General electrical troubleshooting Check power to burner Test switches and loads Troubleshooting the burner ignition Glo-Sil burner ignition Spark ignition burner Glow coil and standing pilot Troubleshooting dryer operation Module 14 Unit 2 Topic 8 Copyright © Canadian Standards Association Answer Key Assignment 2 1. What are the allowable clearances to combustibles for a gas dryer? 6 inches from the top, back, and sides of the dryer Copyright © Canadian Standards Association Answer Key Assignment 2 2. What is the maximum length of a metal connector used to connect a gas dryer? 6 feet (2m) Copyright © Canadian Standards Association Answer Key Assignment 2 3. What must be done to convert a propane dryer to natural gas (or natural gas to propane) to avoid having to get a special inspection? Obtain a manufacturer’s certified conversion kit containing new orifice(s) and regulator part(s) Copyright © Canadian Standards Association Answer Key Assignment 2 4. How should a gas dryer burner flame look when the burner primary is properly adjusted? Blue, lively but not too loud, not scrubbing the top of the burner cone (funnel), extending to the end of the cone and tailing up slightly Copyright © Canadian Standards Association Answer Key Assignment 2 5. If the dryer burner fires but the drum does not turn, what could be the problem? Gas supply shut off, or secondary coil is faulty Copyright © Canadian Standards Association Answer Key Assignment 2 6. If the dryer burner fires for the first cycle but fails to ignite on subsequent cycles and a solenoid click is heard after the ignitor warms up, what could be the problem(s)? Faulty booster coil, or faulty holding coil Copyright © Canadian Standards Association Answer Key Assignment 2 7. What will cause a gas dryer to keep running after the door is opened? Faulty door switch Copyright © Canadian Standards Association Answer Key Assignment 2 8. Where can specific service information about a gas dryer be located? The manufacturer’s service manual Copyright © Canadian Standards Association Answer Key Assignment 2 9. What is the minimum exhaust vent diameter for a gas dryer? 4 inches in diameter Copyright © Canadian Standards Association Answer Key Assignment 2 10. What can cause insufficient drying, even if the lint screen is kept clean? Blocked vent, defective drum seal, blocked air flow in dryer, dryer firing below rated input due to corrosion of dirty orifice Copyright © Canadian Standards Association Unit 3 Barbecues Purpose Gas-fired barbecues, whether set up for natural gas or propane, are one of the simplest gas appliances that the technician will encounter. However, there are service and installation procedures that must be followed which will prolong the life of the unit and ensure satisfactory operation.. Copyright © Canadian Standards Association Unit 3 Barbecues Learning objectives 1. Describe the installation requirements for barbecues. 2. Describe the components of barbecues. 3. Describe the operation of barbecues. 4. Describe the servicing of barbecues. Copyright © Canadian Standards Association Installation requirements Conversion of the appliance Connections Testing Pressure regulators Module 14 Unit 3 Topic 1 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-1 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-2 Copyright © Canadian Standards Association Components Burners Briquettes and lava rock The ignition system Barbecue components Module 14 Unit 3 Topic 2 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-3 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-4 Copyright © Canadian Standards Association Operation Ignition sequence Piezo ignitor Manual ignition Safety when igniting a barbecue Combustion process Flame characteristics Adjusting primary air Module 14 Unit 3 Topic 3 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-5 Copyright © Canadian Standards Association Service Troubleshooting gas barbecues Cleaning the venturi and burner tube Module 14 Unit 3 Topic 4 Copyright © Canadian Standards Association Module 14 Unit 3 Figure 3-6 Copyright © Canadian Standards Association Answer Key Assignment 3 1. What must be done if a barbecue is converted from one gas to the other? The rating plate must be changed to indicate what type of gas the barbecue is set up for Copyright © Canadian Standards Association Answer Key Assignment 3 2. Is a shutoff valve necessary when using a quick disconnect device? Yes Copyright © Canadian Standards Association Answer Key Assignment 3 3. Can barbecues equipped with piezo ignition be match-lit? Yes Copyright © Canadian Standards Association Answer Key Assignment 3 4. Is it possible to install insect guards on burner tubes? Yes Copyright © Canadian Standards Association Answer Key Assignment 3 5. During the lighting of a barbecue should the lid be open or closed? Open Copyright © Canadian Standards Association Unit 4 Lamps Purpose Gas lamps are becoming more popular. Lamps must be installed and set up properly by the gas technician, to ensure that they are both decorative and practical. Copyright © Canadian Standards Association Unit 4 Lamps Learning objectives 1. Describe the installation requirements for lamps. 2. Describe the components of lamps. 3. Describe the operation of lamps. 4. Describe the servicing of lamps Copyright © Canadian Standards Association Installation requirements Rating plate and specifications Clearances Piping and tubing Module 14 Unit 4 Topic 1 Copyright © Canadian Standards Association Components Components of a gas lamp Construction materials Mantles Gas lamp covers Module 14 Unit 4 Topic 2 Copyright © Canadian Standards Association Module 14 Unit 4 Figure 4-1 Copyright © Canadian Standards Association Module 14 Unit 4 Figure 4-2 Copyright © Canadian Standards Association Module 14 Unit 4 Figure 4-3 Copyright © Canadian Standards Association Module 14 Unit 4 Figure 4-4 Copyright © Canadian Standards Association Operation Types of lamps Indoor gas lamps Outdoor gas lamps Principles of gas lamp operation Gas lamps with a mantle Adjusting primary air flow Ignition Module 14 Unit 4 Topic 3 Copyright © Canadian Standards Association Service Servicing and troubleshooting Leak testing Flame impingement Incomplete combustion Troubleshooting electrode ignition systems Module 14 Unit 4 Topic 4 Copyright © Canadian Standards Association Answer Key Assignment 4 1. What are mantles used for? To give off light Copyright © Canadian Standards Association Answer Key Assignment 4 2. What are the two types of mantles used in gas lamps? Soft mantles, pre-formed hard mantles Copyright © Canadian Standards Association Answer Key Assignment 4 3. What must you be sure of when installing indoor gas lamps? You must be sure that the room is properly vented Copyright © Canadian Standards Association Answer Key Assignment 4 4. Before starting any repairs, what should you do? Turn off the gas supply and allow the glass to cool Copyright © Canadian Standards Association Answer Key Assignment 4 5. How often should a gas lamp be cleaned? At least once per year
