GOAL:

Identify what controls and control circuits are and how they control

OBJECTIVES:

At the completion of this lesson, the student will be able to:

1. Describe the construction of a transformer and the way that current is induced in a secondary circuit.
2. Identify some typical problems on an electrical circuit.
3. Follow the sequence of electrical circuit.
4. Identify the project board for lab, hands-on, projects.
5. Describe and discuss electrical grounding.

SUBJECT CONTENTS:

1. Transformers identification
2. Thermostats identification

RESOURCES:

1. W/J/T Refrigeration and Air Conditioning Technology
2. instructor's Handouts

EVALUATION:

Smith: Electricity for Refrigeration

Read: pg 58-71, par (4-1 to 4-4)

Plus pg. 52 par 3-4

GOAL:

Recognize a sequence in a diagram by understanding symbols and rules for diagrams.

OBJECTIVES:

At the completion of this lesson the student will be able to:

1. Recognize and name a symbol.
2. Describe the symbol as cycling or safety
3. Describe what the term "pole" means and how they operate.
4. Describe what the term "throw" means and to use the "throw".
5. Draw symbol for:

SUBJECT CONTENTS:

1. Class exercise sheet.
2. Discussion of symbols on overhead.
3. Demonstrate a cycling control.
4. Demonstrate a safety control.
5. Demonstrate what the term "pole" means.

1. Single pole
2. Double pole
3. Three pole

(Usually the voltage passed through the contacts poles and feeds the load)

1. Demonstrate what the term "throw" means.
2. Demonstrate devices that are "poles" devices.
3. Demonstrate why the N.Y.C.E.C. permits a switch loop wiring circuit.

METHODS/

TECHNIQUES:

1. Class Discussion
2. Handouts and overheads
3. Class exercises
4. Lab exercises

RESOURCES:

1. Hand-out
2. Overheads
3. WJT: read pg. 201 (par. 12.20)-23

EVALUATION:

1. Lab experiment
2. Homework: smith: read pg. 268 — par 10-2 thru 4

GOAL:

Identify and distinguish between circuits with relays and contactors with coil voltages of 24, 120, & 208.

OBJECTIVES:

1. At the completion of this lesson, the student will be able to:
2. Introduction of circuits utilizing relays and contactors.

• Recognize advanced applications of the following controls and

• Single pole relay
• Multiple pole relay
• Multiple pole and multiple throw relay
• High amperage rating relay

1. How to troubleshoot the above relays.
2. Perform relay interchange when called for.

SUBJECT CONTENTS:

1. Defining the relay
• A control which operates one or more sets of contacts (switches) by magnetic induction.
• Relays are designed (or ordered) by the number of contacts, the normal position of the contacts, number or poles, and coil voltage.
• The amperage the contact can carry.
2. When to change a relay.
3. When not to change a relay.
4. Different components that do the same thing.
5. Perform relay interchange when called for.

METHODS/

TECHNIQUES:

1. Class discussion
2. Hangouts and overheads
3. Class exercises
4. Lab exercises
5. Hands-on of various types of relays in class.
6. Diagramming, using relays as the major device.

RESOURCES:

1. Smith: Electricity For Refrigeration, Heating, And Air Conditioning.
2. W/J: Refrigeration And Air Conditioning Technology
3. Overheads and handouts
4. Diagrams

EVALUATION:

1. Lab exercises
2. Diagrams
3. In class exercises
4. Homework: Unit 17 handout: read and answer questions

GOAL:

Identify and troubleshoot disconnect switches fuses and circuit breakers.

OBJECTIVES:

1. At the completion of this lesson, the student will be able to:
2. Identify and troubleshoot indoor/outdoor disconnect switches.
3. Identify and troubleshoot fused; on-fused disconnect switches.
4. Discuss how to properly place an order for a new disconnect switch.
5. Demonstrate troubleshooting of a single and multiple pole circuit breakers.
6. Demonstrate troubleshooting of a fuse.
7. Discuss advantages & disadvantages between fuses & circuit breakers.
8. Explain "phasing in" of a six-pole circuit breaker.

SUBJECT CONTENTS:

1. Identify indoor disconnect switches and their characteristics
1. Power in at the top of the panel.
2. Identify outdoor disconnect switches & the different form indoor switches.
3. Disconnect switches
1. Fused
2. Non-fused
4. Circuit breakers

1. Single pole
2. Multiple pole

1. Fuse identification

1. Edison based
2. Cartridge

METHODS/

TECHNIQUES:

1. Homework assignment
2. Class participation
3. Performance in lab exercises
4. Diagrams exercises
5. Quizzes

RESOURCES:

Refrigeration & Air Conditioning Technology-W/J.

Electricity for Refrigeration, Heating, and Air Conditioning-Smith

Instructor Handouts.

Overheads.

"O.E.M." Wiring Diagrams

Hands-On Disconnect Switches (System Room)

Hands-On Fuses And Circuit Breakers.

GOAL:

Identify and troubleshoot time clocks

OBJECTIVES:

At the completion of this lesson the student will be able to:

1. Identify the time clock electrical connections and mechanical arts
2. Identify some typical problems in a time clock circuits
3. Introductions of circuits utilizing time clock

SUBJECT CONTENTS:

1. One day time clocks
2. Seven day time clock
3. Time clock termination

RESOURCES:

Smith: Electricity for Refrigeration

W/J Refrigeration and Air Conditioning Technology

EVALUATION:

Read Smith pg 296 - timeclocks

Read WJT pg. 431 (par. 25-21 to 27)

Pg. 867 (par. 43-29)

GOAL:

Define the various application of pressure controls and the difference function of the control

OBJECTIVES:

1. Define range
1. Components range
2. Operation range
2. Define action
3. Reset

1. Manual
2. Automatic

1. Medium

1. Air
2. Water
3. Refrigeration
4. Glycol

SUBJECT CONTENTS:

1. Define pressure control: A control that will open or close a set of switches based on the amount of pressure applied to it.
2. Define range: Is the operating pressure the control will start (close) or stop (open) a set of switches to operate a device.
3. Define action: The movement of the contacts in the control — to change from normally open to close or normally close to open. SPST or SPDT.
4. Define manual or auto reset: After an unsafe condition the device will be designed to restart itself or someone will have to restart it after the unsafe condition has been corrected.
5. Define the medium: The "what" to be measured

1. Air
2. Water
3. Refrigerant
4. Glycol

GOAL:

When the temperature rises, the compressor turns on through one starter turning off crankcase heater. When the water pressure drops, the pressure stat closes, solenoid water valve opens. At all times a relay is energized turning on a chilled water pump, through a "HOA" single pole control switch. One lamp is on with compressor, one lamp in on with chilled water pump.

• Show one diagram with control circuit of 120 volts.
• Show one diagram with control circuit 24 volts.

OBJECTIVES:

Make a diagram and turn diagram into lab exercise that will operate in system room on project board.

SUBJECT CONTENTS:

• Proper use of symbols
• Sequence operation
• Avoiding short circuits
• Making diagram readable for others
• Able to test/troubleshoot project from diagram.

METHODS/

TECHNIQUES:

• Student troubleshooting
• Instructor troubleshooting/diagram
• Installing project on lab-board in system room.
• Instructor troubleshooting/lab board.

RESOURCES:

1. W/J Refrigeration and Air Conditioning Technology.
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and notes from class.

EVALUATION:

Lab exercises

Diagram exercises

Quiz

Homework: Read pg. 288, par 17-7

GOAL:

Define the function of a gas-fired, force air furnace.

OBJECTIVES:

Make a pictorial and a schematic diagram that will become lab exercise that will operate in system room on project board.

1. A gas-fire forced air furnace, operating on line voltage, with automatic, low-voltage controls. Provision is made for uniform delivery temperatures and a safety control prevents furnace over heating.
2. The function of the equipment list
1. Standard home electrical source: 120 volts, 60 cycle (Hz), single phase (1 pH), alternating current (AC)
2. A fuse is requested by the safety code.
3. A step-down transformer is required for 24 volt control.
4. A thermostat with terminals "R" and "W" is required.
5. A gas valve is required for heat generation.
6. A normally-closed thermal limit switch is needed to prevent overheating.
7. A normally-open thermal plenum-switch is needed for air temperature control.

SUBJECT CONTENTS:

1. Proper use of symbols
2. Sequence operation
3. Avoiding short circuits
4. Making diagram readable for others
5. Able to test/troubleshoot project form diagram

METHODS/

TECHNIQUES:

1. Student troubleshooting
2. Instructor troubleshooting/diagram
3. Student installing project on lab-board in system room.
4. Instructor troubleshooting lab-board.

RESOURCES:

1. W/J: Refrigeration & Air Conditioning Technology
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and Notes from class

EVALUATION:

1. Wiring Diagrams
2. Lab projects
3. Quiz
4. Homework

GOAL:

Define the function of an oil-fired, forced air furnace hating system

OBJECTIVES:

1. Make a pictorial and schematic diagram that will become a lab exercise that will operate in systems room on project board.
2. List of Electrical Components:
1. The standard home electrical source is 120 volts, 60 cycle (60 Hz), singlephase (1 pH), alternating current (AC).
2. A fuse is required by the safety code.
3. An internally-protected, permanent split capacitor fan motor is needed to drive the forced air fan.
4. A normally open plenum switch is needed for air temperature control.
5. A normally closed thermal limit switch is needed to prevent overheating.
6. A burner motor relay coil is needed to control the burned motor that both pumps the oil and supplies combustion air.
7. A cad cell flame detector is needed to ensure shutdown on flameout.
8. An oil burner primary control is needed to supply 24 volts and for ignition controls.
9. A thermostat with terminals "R’ and "W" is required for automatic control.

SUBJECT CONTENTS:

1. Proper use of symbols
2. Sequence operation
3. Avoiding short circuits
4. Making diagram readable for others
5. Able to test/troubleshoot project from diagram

METHODS/

TECHNIQUES:

1. Student troubleshooting
2. Instructor troubleshooting/diagram
3. Student installing project
4. Instructor troubleshooting/lab-board

RESOURCES:

1. W/J: Refrigeration & Air Conditioning Technology
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and Notes from class

EVALUATION:

1. Wiring Diagrams
2. Lab projects
3. Quiz
4. Homework

GOAL:

Define the function of a typical plug in air conditioning unit. Completely wired by the manufacturer, with a two speed fan.

OBJECTIVES:

Make a pictorial and schematic diagram that will become a lab exercise that will operate in the systems room on the project board.

1. Define the function of an automatically operated air conditioner with two speed fan mort that can be operated when cooling is not required.

• Show diagram in both120 volts and 240 volts
• Show working diagram of two speed fan motor.

1. List the electrical components:
1. The standard home electrical source is 120/240 volts, 60 Hz, single phase (1pH), alternating current (AC).
2. Fuse or circuit breakers is required by the safety code.
3. A selector switch for operation control. This multi —position switch selects the following operating modes

Switch position

Contact made

1. A two-speed fan motor is required for lo and hi-fan and cool operation.
2. A thermostat is required for automatic control of compressor.
3. A permanent split capacitor (PSC) motor, with internal protector is used to drive the compressor.

SUBJECT CONTENTS:

1. Proper use of symbols
2. Sequence operation
3. Avoiding short circuits
4. Making diagrams readable for others
5. Able to test/troubleshoot project from diagrams.

METHODS/

TECHNIQUES:

1. Student troubleshooting
2. Instructor troubleshoot/diagram
3. Student installing project on lab-board in system
4. Instructor troubleshooting lab board

RESOURCES:

1. W/J: Refrigeration & Air Conditioning Technology
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and Notes from class

EVALUATION:

1. Wiring Diagrams
2. Lab projects
3. Quiz
4. Homework

Make a diagram with an on hard start kit, for areas that experience persistent low voltage.

GOAL:

Define the function of a package unit: a complete factory-wired single "package" air cooled air conditioner system. With a low voltage (24V) remote thermostat. The primary voltage is 208/230., 1pH 60 Hz.

OBJECTIVES:

Make a pictorial and schematic diagram that will become a lab exercise that will operate in the system room on the project board.

1. Define the function of the equipment: this is an automatically-controlled air conditioner with a single phase compressor
2. List of electrical components
1. The electrical source is 208/230 volts, 1pH, 60Hz
2. Fuses are required by the safety code.
3. One single phase compressor-motor with thermal overloads is required for cooling
4. A starter with overloads for starting the compressor
5. A high pressure switch to protect the compressor
6. A single phase, psc motor is used at the condenser. It is operated in tandem with the compressor.
7. An indoor fan motor is needed to circulate the cooled air fan relay controls this motor.
8. A 208/230 volt step-down transformer is needed to supply 24 volts current to the low voltage circuit. The transformer is fuse protected.

SUBJECT CONTENTS:

1. Proper use of symbols
2. Sequence of operation
3. Avoiding short circuits
4. Making diagram readable for others
5. Able to test/troubleshooting project from diagrams

METHODS/

TECHNIQUES:

1. Student troubleshooting
2. Instructor troubleshooting/diagram
3. Student installing project on lab-board in system room
4. Instructor troubleshooting lab board

RESOURCES:

1. W/J: Refrigeration & Air Conditioning Technology
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and Notes from class

EVALUATION:

1. Wiring Diagrams
2. Lab projects
3. Quiz
4. Homework

Add a low pressure switch to circuit, and change compressor to a three phase motor

GOAL:

Define the function of an automatically operated, 240 volt, electric resistance, hot-air furnace, designed to energize the heating elements in three steps. For added safety, each heating stage is equipped with a thermal limit switch that opens if the fan fails or any malfunction lead to overheating. All high-voltage circuits are doubly fused and all heating elements are isolated by additional fuses.

OBJECTIVES:

Make a pictorial and schematic diagram that will become a lab exercise that will operate in the system room on the project board.

1. Define the function of the equipment: this is an automatically operated, resistance hot air furnace, steps. Each heating elements equipped with a thermal limit switch that opens if the fan fails or any malfunction leads to overheating.
2. List of electrical components:
1. A 240 volt, 60 Hz, single-phase, AC power source is required.
2. A fuse is required by the safety code.
3. A thermostat, with terminals of common, heat and fan is needed for automatic control.
4. A permanent split capacitor motor is required for hot air distribution.
5. A fan relay is needed for each fan. Three pairs of resistance heating elements, each separated by a fusible link, are required for heat output.
6. Each heating stage is protected by a thermal limit switch.
7. A step-down transformer is used to supply 24 volt power to the control circuit.
8. Each stage is sequenced by a time-delay relay composed of a heater and two sets of normally open contacts: one set in the low voltage circuit, the other in the high voltage circuit.

SUBJECT CONTENTS:

1. Proper use of symbols
2. Sequence of operation
3. Avoiding short circuits
4. Making diagram readable for others
5. Able to test/troubleshooting project from diagrams

METHODS/

TECHNIQUES:

1. Student troubleshooting
2. Instructor troubleshooting/diagram
3. Student installing project on lab-board in system room
4. Instructor troubleshooting lab board

RESOURCES:

1. W/J: Refrigeration & Air Conditioning Technology
2. Smith: Electricity for Refrigeration, Heating and Air Conditioning
3. Handouts and Notes from class

EVALUATION:

1. Wiring project
2. Lab projects
3. Quiz
4. Homework
   W/J/T: Read chapter 29 par. 1 thru 14
   Preventive maintenance
   Questions: pg. 568 1 thru 1