VAV System
A VAV (Variable Air Volume) System is a type of heating and cooling system commonly used in commercial buildings. Think of it as a smart air distribution system that can adjust the amount of air flowing to different areas of a building based on need. Unlike older systems that only turn on or off, VAV systems can vary how much conditioned air they deliver, making them more energy-efficient and comfortable for occupants. It's similar to having a dimmer switch instead of just an on/off switch for your lights.
Examples in Resumes
Maintained and optimized VAV System, Variable Air Volume System operations in 15-story office building
Installed VAV Systems and VAV Boxes in multiple commercial properties
Supervised team of 5 technicians in VAV System troubleshooting and repairs
Typical job title: "HVAC Technicians"
Also try searching for:
Where to Find HVAC Technicians
Professional Organizations
Online Communities
Job Resources
Example Interview Questions
Senior Level Questions
Q: How would you troubleshoot a VAV system that's not maintaining proper temperature control in multiple zones?
Expected Answer: A senior technician should explain a systematic approach: checking the building automation system, verifying sensor readings, inspecting VAV boxes, checking air pressure, and analyzing the central air handling unit performance. They should also mention the importance of preventive maintenance.
Q: How would you manage an energy efficiency upgrade project for multiple VAV systems?
Expected Answer: Should discuss conducting system audits, analyzing energy usage data, recommending improvements like modern controls or sensors, creating implementation schedules, and training building staff on new features.
Mid Level Questions
Q: What are the main components of a VAV system and how do they work together?
Expected Answer: Should be able to explain in simple terms how the main unit, ductwork, VAV boxes, thermostats, and controls work together to deliver the right amount of air to different areas.
Q: How do you balance a VAV system?
Expected Answer: Should explain the process of measuring and adjusting airflow at different points in the system to ensure all areas receive proper air distribution.
Junior Level Questions
Q: What's the difference between a VAV and a constant volume system?
Expected Answer: Should explain that VAV systems can adjust air volume based on needs, while constant volume systems deliver the same amount of air all the time, making VAV more efficient.
Q: What basic maintenance does a VAV system need?
Expected Answer: Should discuss regular filter changes, belt checks, damper operation verification, and basic sensor calibration checks.
Experience Level Indicators
Junior (0-2 years)
- Basic VAV box maintenance
- Reading building blueprints
- Using basic testing equipment
- Following safety procedures
Mid (2-5 years)
- System troubleshooting
- Control system programming
- Air balancing procedures
- Energy efficiency optimization
Senior (5+ years)
- System design and modification
- Project management
- Energy analysis
- Team supervision
Red Flags to Watch For
- No understanding of basic HVAC principles
- Lack of safety awareness
- No experience with building automation systems
- Unable to read mechanical blueprints
