Heating and Air Conditioning: HVA 123 Course Guide, Lab Reports of Engineering

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FRONT RANGE COMMUNITY COLLEGE

CURRICULUM CONTENT GUIDE

HVA 123

HEATING AND AIR CONDITIONING

HVA 123 – HEATING AND AIR CONDITIONING

I. INTRODUCTION

The purpose of this course is to provide the students with an understanding of basic heating and air conditioning theory and service, including gas and electrical heat, heat pumps, residential boiler systems, and central and window air conditioners. This course carries four credits. This course is required for the Certificate in Air Conditioning and Refrigeration. II. COURSE CATALOG DESCRIPTION This course covers basic heating and air conditioning theory and service. Aspects covered include gas heat, electric heat, heat pumps, residential boiler systems and central and window air conditioners. 90 Contact Hours III. METHOD OF INSTRUCTION This course is a group or self-paced individualised course consisting of a combination of learning activities, including independent study, reading assignments, videotapes, laboratory experiments, and job sheets. IV. PREREQUISITES HVA 104 or applicable work experience. V. EVALUATION Course competencies will be demonstrated by correctly performing the procedures outlined in the assignments and job sheets. Evaluation is based on a combination of student test scores, analysis of attendance and progress in the program.

5.1 The student should: 5.1.1 Trace the cooling circuit on a single-phase " package heat/cool unit, and draw an electrical diagram of the unit. 5.1.2 Trace the cooling circuit and draw an electrical diagram for a three- phase roof top unit. 5.1.3 Troubleshoot an air conditioning unit on "no cooling" complaints. 5.1.4 Check the refrigeration system for proper charge in an air conditioner. 5.1.5 Perform maintenance on an air conditioning sys tern.

6. 0 Heat Pump Systems 6.1 The student should: 6.1.1 Trace the operational circuits for a heat pump in the cooling mode. 6.1.2 Trace the operational circuits for first stage heat. 6.1.3 Trace the operational circuits for a heat pump in the defrost mode. 6.1.4 Trace the operational circuits for second stage supplemental heat. 6.1.5 Trace operational circuitsfor a fossil fuel heat pump in first stage heat mode above 45°F outdoor ambient. 6.1.6 Trace operational circuits for a fossil fuel heat pump system in first stage heat mode below 40°F outdoor ambient. 6.1.7 Wire a control system for a heat pump. 6.1.8 Troubleshoot a heat pump in the cooling and heating modes. 6.1.9 Perform maintenance on a heat pump in the cooling and heating modes. 6.1.10 Check the operation of defrost components on a heat pump. 6.1.11 Check the operation of electric-mechanical and electronic heat pump thermostat. 6.1.12 Size a heat pump on the cooling load. 6.1.13 Plot balance points for a heat pump at given design conditions. 6.1.14 Locate equipment to obtain maximum COP from a heat pump. 6.1.15 Set outdoor thermostats for proper staging of electric heat. 7.0 Introduction To Hydronic 7.1 The student should: 7.1.1 Layout a series loop single circuit hydronic system with boiler located in a basement. 7.1.2 Select boiler and expansion tanks. 7.1.3 Make a trial selection of pump and select pipe size for a series loop system. 7.1.4 Draw an electrical diagram of a boiler system. 7.1.5 Calculate the heat output of a boiler. 7.1. 6 Perform a combustion efficiency test on a boiler. 7.1. 7 Perform start up and testing of a hydronic heating system.

8.0 Customer Relations 8.1 The student should: 8.1.1 List ways good personal habits contribute to good customer relations. 8.1.2 Complete statements concerning ways to turn service calls into good customer relation opportunities 8.1.3 List ways to handle irritated customers. 8.1 4 Solve problems concerning ways to earn a customers respect. 8.1.5 Respond to problem situations.

25. AS. #3 Size Gas Piping, (HVAC 235).
26. JS. #1 Install a Gas Furnace, (HVAC 239).
27. JS. #2 Start and Adjust a Gas Furnace, (HVAC 241).
28. JS. #3 Assemble Up Flow Gas Furnace, (HVAC 243).
29. JS. #4 Perform Maintenance, (HVAC 245).
30. JS. #5 Troubleshoot a Gas Furnace, (HVAC 249).
31. View Carrier VCR Tape “Gas Ignition Systems”.
32. Complete Quiz: carrier VCR Tape “Gas Ignition Systems”.
33. View Carrier VCR Tape “Safety and Operating Controls”.
34. Complete Quiz: Carrier VCR Tape “Safety and Operating Controls”.
35. View Carrier VCR Tape “Gas Trouble Shooting”.
36. Complete Quiz: Carrier VCR Tape “Gas trouble shooting”.
37. Complete Unit 9 Exam – Gas Fired Furnaces (obtain exam from the instructor).
38. Proceed to HVA 123.20 High Efficiency Gas Fired Furnaces, MAVCC Text Unit 10.

HVA 123.

AIR MEASUREMENTS

QUIZ

1. Too much air across the heat exchanger of a furnace can cause: A. the cooling coil to freeze up B. condensation induced corrosion C. overheating of the heat exchanger D. poor humidity control.
2. The temperature difference between the air entering a furnace and the air leaving the furnace is called _______________ ______________.
3. The supply air temperature is 140 degrees and the return air temperature is 65 degrees. The heat rise is: A. 140 degrees. B. 65 degrees. C. 75 degrees. D. 205 degrees.
4. Correct airflow across a cooling coil will produce a measurable drop in ___________________ and ____________________.
5. On a belt drive furnace, fan speeds changes are made by adjusting the ___________________.
6. Prior to checking a system for correct airflow: A. check the filter for cleanliness. B. make sure registers are not blocked. C. set the thermostat to prevent cycling off D. All of the above.
7. Air quality can be measured using the heat loss method. True / False
8. A technician knows by calculation the exact heating capacity of a heat pump air handler. What other information does he need to calculate the airflow in CFM?
9. To prevent radiant heat from affecting temperature readings, always take the supply duct temperature reading out of the _________________ _______ _________________ of the heat exchanger or electric heaters.
10. Heat rise was measured at 32 degrees. The calculated heating capacity is 36,000 Btu’s per hour. What is the air quantity in CFM being moved in this system?

Name : ____________________________ HVA 123.

Heating and Air Conditioning

Quiz: Carrier VCR Tape

“Gas Burners”

Answer the following questions:

1. Yellow flame burners are commonly used in gas furnaces (true/false)_________.
2. Robert Wilhelm Von Bunsen invented the Bunsen burner in 1842 when he discovered that he could obtain a blue flame by aerating the gas after it left the port (true/false) __________.
3. A gas control valve is not used on a Bunsen burner (true/false) _____________.
4. There are three visible zones of combustion in a Bunsen-type flame: The inner cone, the outer cone, and the _________________.
5. Air which is mixed with the gas entering the burner is called _________________air.
6. Air which mixes in the combustion zone is called _____________air.
7. Two types of blue flame burners commonly used in gas-fired furnaces are _____________________and _____________________.
8. The main purpose of the venturi is to help the high velocity gas jet to inject the proper amount of primary air before it reaches the burner port (true/false) ____________.
9. Devices that help to reduce the flame temperature will reduce the flame temperature will reduce NOx production (true/false)___________.
10. Primary aerated pilot burners are simply small _____________ -type burners.

Name: _______________________________ HVA 123.

Heating and Air Conditioning

Quiz: Carrier VCR Tape

“Gas Controls”

Answer the following questions:

1. The two basic gas controls used on all furnaces are: 1._____________________ 2._____________________
2. The natural gas pressure regulator in the supply lines into a building is usually set by the utility for __________________.
3. Gas fired furnaces for natural gas come equipped with a pressure regulator which must be set at 3.5 inches W.C. by the gas utility before the furnace can be operated (true/false) _____________?
4. A gas pressure regulator is a simple device that balances the gas pressure forces on a diaphragm against atmospheric and spring forces to control the position of the flow modulating valve (true/false) ___________.
5. A manual gas valve is open when its handles are in line with the flow of gas in the pipe (true/false) __________.
6. When an automatic valve is de-energized, it is normally closed (true/false) ___________.
7. When attempting to light a pilot, the first thing you should always do is

   ---

   ___________________________________________________.
8. An automatic combustion gas valve with two valves in a series is called a ______________valve.
9. A two-stage valve is the same thing as a redundant valve because it has two valves (true/false)___________.
10. It is not a basic step for trouble shooting a gas valve to check the gas pressure with a manometer (true/false) ___________.

Name: __________________________________ HVA 123.

Heating and Air Conditioning

Quiz: Carrier VCR Tape

“Principles of Gas Combustion”

Answer the following questions:

4. Natural gas, methane and propane are the three common fuel gases supplied by utilities for residential heating (true/false) ____________.
5. The propane molecule is made up of three carbon and eight hydrogen atoms (true/false) ___________.
6. The high boiling points of propane and butane make it possible to store them in the liquid form (true/false) _____________.
7. The heating value of methane is 995 BTU/CU.FT. (true/false) ____________.
8. What is the special gravity of air? _________________________________________________.
9. Odorants are added to fuel gases help us detect the small leaks of fuel gases by smell (true/false) ____.
10. Burning speed is sometimes referred to as the flame velocity or ignition speed (true/false) ________.
11. Excess air is required to assure that there will be more than enough oxygen present to prevent incomplete combustion (true/false) ____________.
12. Incomplete combustion results in formation of carbon monoxide, aldehydes and _______________________.
13. Stoichiometric combustion means that there is the exact amount of air present for complete combustion (true/false) _____________.

STUDY GUIDE

HVA 123.

HEATING AND AIR CONDITIONING

HIGH EFFICIENCY GAS FURNACE

I.S. = Information Sheet A.S. = Assignment Sheet J.S. = Job Sheet M.R.A.C. = Modern Refrigeration and Air Conditioning MAVCC = Multistate Academic and Vocational Curriculum Consortium

1. MAVCC Text Unit 10 Study IS, “Terms and Definitions” in workbook (HVAC 263).
2. Study supplements 1,2 &3 pages HVAC 267-271 and 273.
3. Complete A.S. #1 (HVAC 275) Track H.V. Circuit.
4. Complete A.S. #2 (HVAC 279) Track Low Volt Circuit.
5. Complete J.S. #1 (HVAC 283) Induces Draft Furnace.
6. Complete J.S. #2 (HVAC 285) Condensing Draft Furnace.
7. Complete Unit 10 Exam High Efficiency Gas Furnaces (obtain exam from instructor)
8. Proceed to HVA 123.30 Electric Heating Systems MAVCC Unit 12.

STUDY GUIDE

HVA 123.

HEATING AND AIR CONDITIONING

COOLING SYSTEMS

I.S. = Information Sheet A.S. = Assignment Sheet J.S. = Job Sheet M.R.A.C. = Modern Refrigeration and Air Conditioning MAVCC = Multistate Academic and Vocational Curriculum Consortium

1. Study MRAC Text Chapter 24.10 – 24.14.
2. Complete Chapter 24 “Test Your Knowledge Questions 11-20.
3. Study MAVCC Unit 13 IS Cooling Systems pages 363 through 375
4. CompleteAS #1 HVAG 715 Trace “The Cooling Circuit” page HVAC 377.
5. Complete JS #1 Troubleshooting an Air Conditioner Condenser Section on a “No Cooling” Complaint. page HVAC 383.
6. Complete JS #2 Using a Charging Table to Check the Charge page HVAC 387.
7. Complete JS #3 Perform Maintenance on an Air Conditioner page HVAC 391.
8. Complete Unit 13 Exam –Cooling Systems (obtain exam from instructor).
9. Proceed To HVA 123.50 MAVCC UNIT 14 – Heat Pump Systems

STUDY GUIDE

HVA 123.

HEATING AND AIR CONDITIONING

HEAT PUMP SYSTEMS

I.S. = Information Sheet A.S. = Assignment Sheet J.S. = Job Sheet M.R.A.C. = Modern Refrigeration and Air Conditioning MAVCC = Multistate Academic and Vocational Curriculum Consortium

1. View Lennox Video Tape “Introduction to Heat Pumps”
2. Complete Lennox Video Tape Heat Pump Quiz
3. Study MRAC Text paragraph 24.1 through 24.
4. Complete “Test Your Knowledge” - questions 1 through 10 in Chapter 24 in M.R.A.C.
5. Study MAVCC Unit 14 I.S. - pages HVAC 393 through HVAC 404.
6. Study MAVCC Unit 14 supplement 1 – HVAC 405.
7. Complete A.S. #1 – HVAC 407 – Trace Circuits.
8. Complete A.S. #2 – HVAC 409 - Trace Circuits.
9. Complete A.S. #3 – HVAC 411 – Trace Circuits.
10. Complete A.S. #4 – HVAC 413 – Trace Circuits.
11. Complete A.S. #5 – HVAC 415 – Trace Operational Circuits
12. Complete A.S. #6 – HVAC 417 - Trace Operational Circuits
13. Complete J.S. #1 - HVAC 419 – Wire A Control System.
14. Complete J.S. #2 - HVAC 423 – Trouble Shoot a Heat Pump.
15. Complete J.S. #3 – HVAC 431 -.Perform Maintainenence.
16. Complete J.S. #4 – HVAC 427 - Trouble Shoot a Heat Pump.
17. Complete J.S. #5 – HVAC 431 - Trouble Shoot a Heat Pump.
18. Complete J.S. #6 – HVAC 433 – Perform Maintainence.
19. Complete J.S. #7 – HVAC 435 – Trouble Shoot supplement
20. Complete J.S. #8 – HVAC 439 – Perform Maintainence.
21. Complete J.S. #9 - HVAC 441 – Trouble Shoot a Heat Pump.
22. Complete J.S. #10 - HVAC 443 - Trouble Shoot a Heat Pump
23. Complete J.S. #11 – HVAC 445 - Trouble Shoot a Heat Pump
24. Complete J.S. #12 – HVAC 447 – Check Operation.

Name: _________________________________

HVA 123.

Heat Pump Quiz

1. Name the two types of heat pump systems.
   1. _______________________________ 2. _______________________________
2. Heat pump terminology commonly refers to ________________ and _____________ coils rather than condenser and evaporator coils.
3. The valve that switches between heating and cooling is call the ______________ valve.
4. A __________________ control detects ice buildup and switches the heat pump into the cooling cycle.
5. What is it called when the heat pumps capacity matches the heating loss. ________________ _______________.
6. When using fossil fuels as an auxilary heat what must happen to the heat pump when balance point is reached. _______________________________________________
7. What is the purpose of an accumilator on a heat pump system.
8. Design sizing a heat pump is based on the ______________________ requirements.
9. Auxlillary heat should be sized to carry the _________________ heat loss.
10. The minimum distance from the underside of the heat pump to a sloped pad should be _______ inches.

STUDY GUIDE

HVA 123.

HEATING AND AIR CONDITIONING

BALANCE POINTS

I.S. = Information Sheet A.S. = Assignment Sheet J.S. = Job Sheet M.R.A.C. = Modern Refrigeration and Air Conditioning MAVCC = Multistate Academic and Vocational Curriculum Consortium

1. Study MAVCC Unit 15 I.S. – pages HVAC 453 through 461.
2. Complete A.S. #1 Plot balance points for a heat pump at given conditions (HVAC 463).
3. Complete A.S. #2 Locate equipment to obtain maximum cop from a heat pump.(HVAC 465).
4. Complete J.S.#1 – Set out door thermostats for proper staging of auxiliary heat.
5. Complete Unit 15 Exam – Balance Points (obtain exam from instructor).
6. Proceed to HVA 123.70 MAVCC Unit 16 - Introduction to Hydronics.