Self-Directed Course #416
FUNDAMENTALS OF TROUBLESHOOTING LARGE HVAC SYSTEMSLesson #1
Terminology
Lesson #2
Ventilation Systems and Components
Overview of Large Central Systems
Single and Multizone
Single and Dual Duct
Reheat
Return fan Systems
Outdoor air intake systems
Perimeter Systems
Unitary Systems
Understanding System fan Curves for Large Systems
Lesson #3
Ventilation Systems and Components, cont.
Mechanical Filtering Systems
Electronic Filtering Systems
Coil types
Dampers, Types and Usage
Controls and Control Cycles
Lesson #4
Details of Hybrid and Straight Variable Air Volume(VAV) systems
Single duct systems
Single duct VAV with Reheat
Single duct VAV with reheat and Induction
Single duct VAV with fan operated box and constant rpm fan
Single duct VAV system with intermittent type fan powered box
Single duct VAV system with a dual duct zone feed
Dual duct VAV system with a single supply fan
Dual duct – two supply fan VAV system
Lesson #5
Building Ventilation
Problem Situations
Air change with outdoor air
Building stack effect and pressure problems
Lesson #6
Building Ventilation Problems
Performance vs. design
Static pressure and vertical airflow
Pressure relationships
Ventilation effectiveness and mixing factor
Ventilation short-circuiting
Lesson #7
Instrumentation For Troubleshooting
Temperature
Relative Humidity
Delta pressure
Static pressure tap design
Pitot static tubes
Hot wire anemometers
Rotating vane air measurers
Flow hoods
Tracer gas monitors
Lesson #8
Tracer Gas Measurement techniques
Lesson #9
Measurement and Testing, putting it all together
Lesson #10
Advanced Measurement Techniques For Advanced Troubleshooting
Multiplicative Methods
Uncertainty Calculations
Tracer Gas Decay procedures
Equilibrium CO2 Analysis
Residual CO2 Methods
Concentration Decay Measurements
Seeding CO2 into A/C Systems for Measurement Purposes
Lesson #11
Space Use Assessment Procedures
Space Use Analysis
Design Evaluation Procedures
Control Sequences
Airflow Determinations
Pressure
Relationships
Lesson #12
Advanced Component Assessment Procedures
Air Handlers
Intakes
Distribution Systems
Ducts
Terminal Units
The VAV System Design Check List
System Verification Percentages
Lesson #13
Ventilation Evaluation Procedures
Exhaust Systems
Makeup Air
Building Pressure Relationships
Pressure Differences Across the Exterior Envelope
Pressure Difference Between Adjoining Spaces
Tracer Gas and Equilibrium with CO2 Analysis
Supply Air Systems
Lesson #14
Verification Procedures Related to ASHRAE Standard 62
Lesson #15
Understanding Control Loops and their problems
Common Loops
Open Control Loops
Closed Control Loops
Combination Loops
Control Loop
Costs
Lesson #16
Some Specific Design Problems and Solutions