Heating Maintenance and Repair Electric Furnace Electric Baseboard Gas Furnace Hydronic Heating Introduce yourself and provide relevant information for this session: Restroom location Smoking rules Cell phone usage Class schedule

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

Heating Systems Safety Rules: 1. Turn Power Off 2. Wear Personal Protective Equipment (PPE) 3. Follow Lock-Out /Tag-Out Procedures

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

These are used to prevent catastrophic failure of equipment. 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 Adding heat = molecules move faster 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.

1. Electric Heat (forced air) 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 with mercury switch attached

HVAC HVAC Servicing Procedures / Pg. 43

Transformer

Transformer

HVAC HVAC Servicing Procedures / Pg. 43

Electric Furnace Heating Pg. 20-21

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

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

Key Parts of an Gas Furnace: Fan Switches Limit Switch Flue Pipe

Gas Furnace

Gas Furnace Play the video and answer any questions that follow

Interlock

Video: Hydronic Heat Basics Watch Video

Q&A Q A

Thank You For Attending Action Plan Page 65 Thank You For Attending