Course Title:
Course Number:
|
INTEGRATED REFRIGERATION/AIRCONDITIONING
SYSTEMS: EVALUATION & DIAGNOSTICS
IRD-1 |
| |
Through lecture
and hands-on exercises, this course will present a complete
overview of students’ prior knowledge and prior studies of
HVAC/R electricity through schematic reading and circuit wiring
for thermostats and control panels; diagnosing electrical
accessories; air conditioning systems diagnosis; airside system
diagnosis, integrated diagnostics. |
| Course
Outline: |
Download/print this course outline |
| DAY 1 SUBJECT:
|
Course Introduction and Expectations; Prior Knowledge Evaluation
and Review of Prior Studies of HVAC/R Electricity |
| SUBJECT CONTENTS:
|
State the instructor’s
expectations and student responsibilities
Identify areas of electrical knowledge requiring further study.
(Star B7) |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz
Performance-based (Hands-on live equipment) |
| |
|
| DAY 2 SUBJECT: |
Single Phase Motor Testing
and Diagnostics, including: amping-out motors; testing motor
starting relays, centrifical switches and capacitors. Schematic
reading and circuit wiring for contactors, switching relays
and motor control. |
| GOAL: |
Measure contactor
coil and contact resistances
Check appropriateness of contactor in systems |
| OBJECTIVES: |
Verify transformer
output and operation. (Star B8)
Check control fuses. (StarB8)
Verify thermostat operation. (StarB8)
Diagnose contactors and switching relays.
Check all operational and safety controls (pressure controls;
lube-oil protection |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz
Performance-based (Hands-on live equipment) |
| |
|
| DAY 3 SUBJECT: |
Three Phase Motor Testing and
Diagnostics, including: checking for phase balance; amping
out and megging motors; motor starters/controllers and overload
protectors. Schematic reading and circuit wiring for thermostats
and control panels. |
| GOAL: |
Inspect motor bearings
and shaft
Inspect motor wiring and insulation with megger |
| OBJECTIVES: |
Determine motor
type and requirements (horsepower, voltage, type or wiring,
etc.) (Star B9)
Size the motor and frame. (Star B9)
Inspect termination & Identify single phase motor terminals
or leads; reterminate. (Star B9)
Test motor starting relays, and centrifugal switches.
Test capacitors.
Wire a single phase motor to a control panel.
Verify supply voltage and amp-out single phase motors. |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 4 SUBJECT: |
Diagnosing Electrical Accessories,
Controls and Control Circuits, including: transformers; Thermostats;
contactors; switching relays; pressure controls; lube-oil
protection switches; and solenoid and four-way valves |
| GOAL: |
Inspect condition
of breaker Perform visual inspection of and check circuit
board inputs and outputs |
| OBJECTIVES: |
Meg a three phase
motor. (Star B9)
Read a three phase motor wiring diagram
Verify three phase voltage and power supply (Star B8/B11).
Diagnose distribution problems, phase and current imbalance,
phase loss, phase reversal, phase shift, power factor (Star
B8)
Amp-out a three phse motor and check for current imbalance.
(Star B11)
Diagnose motor starters and overload protectors. (Star B8) |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz
Performance-based (Hands-on live equipment) |
| |
|
| DAY 5 SUBJECT: |
Diagnosing Electrical Condenser
Fan Controls |
| GOAL: |
Perform visual/auditory
inspection of the unit oil residue, frost, wear on copper
tubing, damaged piping, hissing sound |
| OBJECTIVES: |
Diagnose electrical
controls for condenser fans. (Star B12)
Test solenoids and valve operation for liquied line, de-icing,
hot gas bypass, and four-way reversing valves, etc. (Star
B11)
Verify operation of resistance heating elements (crankcase
heaters, de-icing heaters, etc.) |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized
study guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION:
|
Weekly
Quiz Performance-based (Hands-on live equipment) |
| |
|
| DAY 6 SUBJECT: |
Diagnosing Solid State Controls |
| GOAL: |
Check charge based
on condenser subcooling |
| OBJECTIVES: |
Determine function
of board or module. (Star B10)
Set jumpers or dip switches as required. (Star B10)
Follow vendor procedures to install board. (Star B10)
Perform visual inspection of board. (Star B10)
Check inputs and outputs. (Star B10)
Program unit. (Star B10)
Replace board. (Star B10) |
METHODS/
TECHNIQUES : |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 7 SUBJECT: |
Midterm Evaluation and Review |
| GOAL: |
Check charge based
on highside and lowside pressure temperature relationships |
| OBJECTIVES: |
Pass a multiple
choice exam with a minimum grad of 75% accuracy. |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| |
|
| EVALUATION: |
Quiz Whitman Johnson
|
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 8 SUBJECT: |
Air Conditioning System Diagnostics:
Introduction and Prior Knowledge Evaluation. |
| GOAL: |
Check charge based
on evaporator superheat
Lock out and tag; isolate pressure sensitive components |
| OBJECTIVES: |
Identify types of
air conditioning systems (i.e., self contained, split, built
up, etc.) (Star D22)
State saturated conditions at off cycle for an R-22 system
State standard low-side design conditions for an R-22 system
State standard high-side design conditions for an R-22 system |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 9 SUBJECT: |
Airside System Diagnostics. |
| GOAL: |
Check ventilation
system capacity |
| OBJECTIVES: |
Measure air duct
openings
Calculate free area of air duct outlets
Measure air velocity
Measure and/or calculate supply/return air volume
Measure air duct static, velocity and total pressure.
Check fan/blower speed.
Check for wear condition and tension or blower belts (Star
D21)
Verify matching blower belts. |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 10 SUBJECT: |
Air Conditioning Cooling System
Diagnostics: Lowside |
| GOAL: |
Troubleshoot fans
and air handling equipment Lock out and tag air handling equipment
|
| OBJECTIVES: |
Check lowside operating
conditions, pressure, temperature and temperature split. (Star
D21)
Analyze operating conditions based on design criteria.
Diagnose variations between operating conditions and design
criteria.
Analyze system charge based on lowside operating conditions. |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz
Performance-based (Hands-on live equipment) |
| |
|
| DAY 11 SUBJECT: |
Air Conditioning Cooling System
Diagnostics: Highside |
| GOAL: |
Check system capacity
and charge based on psychrometrics |
| OBJECTIVES: |
Check highside operating
conditions, pressure temperature and temperature split. (Star
D21)
Check pressure and temperature drop across dryer. (Star D34)
Troubleshoot/install metering devices. (Star D 33) |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
| |
|
| DAY 12 SUBJECT: |
Integrated Diagnostics |
| OBJECTIVES: |
Inspect indoor air
quality using air snifters
Check belt tension; replace belts |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz
Performance-based (Hands-on live equipment) |
| |
|
| DAY 13 SUBJECT: |
Final Examination and Review |
| GOAL: |
Final Exam |
| OBJECTIVES: |
Pass a multiple
choice exam based on the course and UA STAR sample questions
with a minimum accuracy of 75%. |
METHODS/
TECHNIQUES: |
Lecture, Hands-on,
Lab-rooms required: Systems room, Electrical Room |
| RESOURCES: |
Customized study
guide and training materials (BMMSA)
Mechanical Systems Diagnostics
UASTAR Study Guide |
| EVALUATION: |
Weekly Quiz Performance-based
(Hands-on live equipment) |
