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Heating Maintenance and Repair Electric Furnace Electric Baseboard Gas Furnace Hydronic Heating Disclaimer The use of photos of tools and/or components which clearly indicate their manufacturer or brand in no way implies an endorsement of the company, brand or product by the National Apartment Association Education Institute. Welcome! Course Topics • • • • • • • • Roles and Responsibilities Heating Safety Tools and Equipment Air Distribution Electric Furnaces Electric Baseboard Gas Furnaces Hydronic Heating Resources: • Participant Guide • Presentation • Your Questions • Your Experiences • Videos • Demonstrations • Your Participation Safety Heating Systems Safety Rules: 1. Turn Power Off 2. Wear Personal Protective Equipment (PPE) 3. Follow Lock-Out /Tag-Out Procedures Safety Heating Systems Safety Rules: 4. Keep Tools and Equipment in Good Working Order 5. Do Not Take Shortcuts or Bypass Safety Features in Heating Systems Safety Devices These are used to prevent catastrophic failure of equipment. DO NOT BYPASS Key Tools for Heating Repairs Electric Air Distribution Gas Air Distribution Components Pg. 13 Lubricate, Testing and Replacing Fan Relay • • • Instant action switch When low voltage is applied, a magnet is used to change the condition of the contacts What was open is now closed, what was closed is now open. Sequencer • Can have multiple levels (stages) to send power to different loads, at different times Sequencer • • • A delayed action switch When low voltage is applied it heats a small element Heat causes bimetallic switch to close Heating element Bimetallic switch Limit Switch Forced-Air Systems Heat • Increasing the temperature in a specific space 0K = -459.67˚F 300K = 80.3˚F Adding heat = molecules move faster Adding Heat • Cant be created, just transformed Moving Heat Conduction – Convection - Radiation Heat IMPORTANT: Heat will only transfer from higher temperature to lower, never the reverse. Heat Types of Heating Systems: 1. Electric Heat (forced air) 2. Electric Baseboard 3. Gas Furnace (forced air) 4. Hydronic Heat HVAC HVAC Servicing Procedures / Pg. 43 Thermostat Thermostat Thermostat • Think of a thermostat as a switch that is controlled by the temperature of the living space. • The operator controls the open/close point of that switch. • The temperature in the room controls the actual switch. Thermometer Coil Thermometer coil with mercury switch attached HVAC HVAC Servicing Procedures / Pg. 43 Transformer Transformer HVAC HVAC Servicing Procedures / Pg. 43 Electric Furnace Heating Pg. 20-21 Electric Furnace Key Parts of an Electric Furnace: • Blower • Heating Coils • Interlock Electric Baseboard Heating Electric Heat Element Limit Switch Fuse Link Electric Heat Schematic Anatomy of a Gas Furnace Gas Furnace Key Parts of an Gas Furnace: • Gas Control Valve • Gas Manifold • Gas Burners • Heat Exchanger • Ignition System • Thermocouple/ Power Pile • Blower Gas Furnace Gas Furnace Gas Furnace Exhaust Exhaust Safety Gas Valve Roll Out Gas Burners Gas Manifold Gas Furnace Key Parts of an Gas Furnace: • Fan Switches • Limit Switch • Flue Pipe Gas Furnace Gas Furnace Interlock Video: Hydronic Heat Basics Watch Video Q&A Q A Action Plan Page 65 Thank You For Attending